diff --git a/package.json b/package.json
index 15112ee2c8..28161a728a 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,6 @@
     "flow-bin": "0.111.3",
     "mocha": "6.2.2",
     "nyc": "14.1.1",
-    "prettier": "1.18.2"
+    "prettier": "1.19.1"
   }
 }
diff --git a/src/language/__tests__/schema-parser-test.js b/src/language/__tests__/schema-parser-test.js
index 9abcc05d21..2a6a73a5bd 100644
--- a/src/language/__tests__/schema-parser-test.js
+++ b/src/language/__tests__/schema-parser-test.js
@@ -1077,12 +1077,11 @@ input Hello {
     });
 
     const doc = parse(body, { allowLegacySDLImplementsInterfaces: true });
-    expect(toJSONDeep(doc)).to.have.deep.nested.property(
-      'definitions[0].interfaces',
-      [
-        typeNode('Wo', { start: 22, end: 24 }),
-        typeNode('rld', { start: 25, end: 28 }),
-      ],
-    );
+    expect(
+      toJSONDeep(doc),
+    ).to.have.deep.nested.property('definitions[0].interfaces', [
+      typeNode('Wo', { start: 22, end: 24 }),
+      typeNode('rld', { start: 25, end: 28 }),
+    ]);
   });
 });
diff --git a/src/subscription/__tests__/mapAsyncIterator-test.js b/src/subscription/__tests__/mapAsyncIterator-test.js
index 3821917970..7ecfa3353f 100644
--- a/src/subscription/__tests__/mapAsyncIterator-test.js
+++ b/src/subscription/__tests__/mapAsyncIterator-test.js
@@ -200,7 +200,11 @@ describe('mapAsyncIterator', () => {
       throw new Error('Goodbye');
     }
 
-    const doubles = mapAsyncIterator(source(), x => x + x, error => error);
+    const doubles = mapAsyncIterator(
+      source(),
+      x => x + x,
+      error => error,
+    );
 
     expect(await doubles.next()).to.deep.equal({
       value: 'HelloHello',
diff --git a/src/type/__tests__/enumType-test.js b/src/type/__tests__/enumType-test.js
index 0b87bb45c6..d2d1acc041 100644
--- a/src/type/__tests__/enumType-test.js
+++ b/src/type/__tests__/enumType-test.js
@@ -279,7 +279,10 @@ describe('Type System: Enum Values', () => {
         {
           message:
             'Variable "$color" of type "String!" used in position expecting type "Color".',
-          locations: [{ line: 1, column: 8 }, { line: 1, column: 47 }],
+          locations: [
+            { line: 1, column: 8 },
+            { line: 1, column: 47 },
+          ],
         },
       ],
     });
@@ -294,7 +297,10 @@ describe('Type System: Enum Values', () => {
         {
           message:
             'Variable "$color" of type "Int!" used in position expecting type "Color".',
-          locations: [{ line: 1, column: 8 }, { line: 1, column: 44 }],
+          locations: [
+            { line: 1, column: 8 },
+            { line: 1, column: 44 },
+          ],
         },
       ],
     });
diff --git a/src/type/__tests__/validation-test.js b/src/type/__tests__/validation-test.js
index 4f9ee18f2c..39e92d9c0d 100644
--- a/src/type/__tests__/validation-test.js
+++ b/src/type/__tests__/validation-test.js
@@ -548,7 +548,10 @@ describe('Type System: Union types must be valid', () => {
     expect(validateSchema(schema)).to.deep.equal([
       {
         message: 'Union type BadUnion must define one or more member types.',
-        locations: [{ line: 6, column: 7 }, { line: 4, column: 9 }],
+        locations: [
+          { line: 6, column: 7 },
+          { line: 4, column: 9 },
+        ],
       },
     ]);
   });
@@ -576,7 +579,10 @@ describe('Type System: Union types must be valid', () => {
     expect(validateSchema(schema)).to.deep.equal([
       {
         message: 'Union type BadUnion can only include type TypeA once.',
-        locations: [{ line: 15, column: 11 }, { line: 17, column: 11 }],
+        locations: [
+          { line: 15, column: 11 },
+          { line: 17, column: 11 },
+        ],
       },
     ]);
 
@@ -585,11 +591,17 @@ describe('Type System: Union types must be valid', () => {
     expect(validateSchema(schema)).to.deep.equal([
       {
         message: 'Union type BadUnion can only include type TypeA once.',
-        locations: [{ line: 15, column: 11 }, { line: 17, column: 11 }],
+        locations: [
+          { line: 15, column: 11 },
+          { line: 17, column: 11 },
+        ],
       },
       {
         message: 'Union type BadUnion can only include type TypeB once.',
-        locations: [{ line: 16, column: 11 }, { line: 1, column: 25 }],
+        locations: [
+          { line: 16, column: 11 },
+          { line: 1, column: 25 },
+        ],
       },
     ]);
   });
@@ -692,7 +704,10 @@ describe('Type System: Input Objects must have fields', () => {
       {
         message:
           'Input Object type SomeInputObject must define one or more fields.',
-        locations: [{ line: 6, column: 7 }, { line: 4, column: 9 }],
+        locations: [
+          { line: 6, column: 7 },
+          { line: 4, column: 9 },
+        ],
       },
     ]);
   });
@@ -796,12 +811,18 @@ describe('Type System: Input Objects must have fields', () => {
       {
         message:
           'Cannot reference Input Object "SomeInputObject" within itself through a series of non-null fields: "startLoop.closeLoop".',
-        locations: [{ line: 7, column: 9 }, { line: 11, column: 9 }],
+        locations: [
+          { line: 7, column: 9 },
+          { line: 11, column: 9 },
+        ],
       },
       {
         message:
           'Cannot reference Input Object "AnotherInputObject" within itself through a series of non-null fields: "startSecondLoop.closeSecondLoop".',
-        locations: [{ line: 12, column: 9 }, { line: 16, column: 9 }],
+        locations: [
+          { line: 12, column: 9 },
+          { line: 16, column: 9 },
+        ],
       },
       {
         message:
@@ -866,7 +887,10 @@ describe('Type System: Enum types must be well defined', () => {
     expect(validateSchema(schema)).to.deep.equal([
       {
         message: 'Enum type SomeEnum must define one or more values.',
-        locations: [{ line: 6, column: 7 }, { line: 4, column: 9 }],
+        locations: [
+          { line: 6, column: 7 },
+          { line: 4, column: 9 },
+        ],
       },
     ]);
   });
@@ -1067,7 +1091,10 @@ describe('Type System: Objects can only implement unique interfaces', () => {
     expect(validateSchema(schema)).to.deep.equal([
       {
         message: 'Type AnotherObject can only implement AnotherInterface once.',
-        locations: [{ line: 10, column: 37 }, { line: 10, column: 56 }],
+        locations: [
+          { line: 10, column: 37 },
+          { line: 10, column: 56 },
+        ],
       },
     ]);
   });
@@ -1093,7 +1120,10 @@ describe('Type System: Objects can only implement unique interfaces', () => {
     expect(validateSchema(extendedSchema)).to.deep.equal([
       {
         message: 'Type AnotherObject can only implement AnotherInterface once.',
-        locations: [{ line: 10, column: 37 }, { line: 1, column: 38 }],
+        locations: [
+          { line: 10, column: 37 },
+          { line: 1, column: 38 },
+        ],
       },
     ]);
   });
@@ -1169,7 +1199,10 @@ describe('Type System: Interface extensions should be valid', () => {
       {
         message:
           'Interface field argument AnotherInterface.newField(test:) expected but AnotherObject.newField does not provide it.',
-        locations: [{ line: 3, column: 20 }, { line: 7, column: 11 }],
+        locations: [
+          { line: 3, column: 20 },
+          { line: 7, column: 11 },
+        ],
       },
     ]);
   });
@@ -1217,7 +1250,10 @@ describe('Type System: Interface extensions should be valid', () => {
       {
         message:
           'Interface field AnotherInterface.newInterfaceField expects type NewInterface but AnotherObject.newInterfaceField is type MismatchingInterface.',
-        locations: [{ line: 3, column: 30 }, { line: 15, column: 30 }],
+        locations: [
+          { line: 3, column: 30 },
+          { line: 15, column: 30 },
+        ],
       },
     ]);
   });
@@ -1609,7 +1645,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Interface field AnotherInterface.field expected but AnotherObject does not provide it.',
-        locations: [{ line: 7, column: 9 }, { line: 10, column: 7 }],
+        locations: [
+          { line: 7, column: 9 },
+          { line: 10, column: 7 },
+        ],
       },
     ]);
   });
@@ -1632,7 +1671,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Interface field AnotherInterface.field expects type String but AnotherObject.field is type Int.',
-        locations: [{ line: 7, column: 31 }, { line: 11, column: 31 }],
+        locations: [
+          { line: 7, column: 31 },
+          { line: 11, column: 31 },
+        ],
       },
     ]);
   });
@@ -1658,7 +1700,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Interface field AnotherInterface.field expects type A but AnotherObject.field is type B.',
-        locations: [{ line: 10, column: 16 }, { line: 14, column: 16 }],
+        locations: [
+          { line: 10, column: 16 },
+          { line: 14, column: 16 },
+        ],
       },
     ]);
   });
@@ -1721,7 +1766,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Interface field argument AnotherInterface.field(input:) expected but AnotherObject.field does not provide it.',
-        locations: [{ line: 7, column: 15 }, { line: 11, column: 9 }],
+        locations: [
+          { line: 7, column: 15 },
+          { line: 11, column: 9 },
+        ],
       },
     ]);
   });
@@ -1744,7 +1792,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Interface field argument AnotherInterface.field(input:) expects type String but AnotherObject.field(input:) is type Int.',
-        locations: [{ line: 7, column: 22 }, { line: 11, column: 22 }],
+        locations: [
+          { line: 7, column: 22 },
+          { line: 11, column: 22 },
+        ],
       },
     ]);
   });
@@ -1767,12 +1818,18 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Interface field AnotherInterface.field expects type String but AnotherObject.field is type Int.',
-        locations: [{ line: 7, column: 31 }, { line: 11, column: 28 }],
+        locations: [
+          { line: 7, column: 31 },
+          { line: 11, column: 28 },
+        ],
       },
       {
         message:
           'Interface field argument AnotherInterface.field(input:) expects type String but AnotherObject.field(input:) is type Int.',
-        locations: [{ line: 7, column: 22 }, { line: 11, column: 22 }],
+        locations: [
+          { line: 7, column: 22 },
+          { line: 11, column: 22 },
+        ],
       },
     ]);
   });
@@ -1800,7 +1857,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Object field AnotherObject.field includes required argument requiredArg that is missing from the Interface field AnotherInterface.field.',
-        locations: [{ line: 13, column: 11 }, { line: 7, column: 9 }],
+        locations: [
+          { line: 13, column: 11 },
+          { line: 7, column: 9 },
+        ],
       },
     ]);
   });
@@ -1840,7 +1900,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Interface field AnotherInterface.field expects type [String] but AnotherObject.field is type String.',
-        locations: [{ line: 7, column: 16 }, { line: 11, column: 16 }],
+        locations: [
+          { line: 7, column: 16 },
+          { line: 11, column: 16 },
+        ],
       },
     ]);
   });
@@ -1863,7 +1926,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Interface field AnotherInterface.field expects type String but AnotherObject.field is type [String].',
-        locations: [{ line: 7, column: 16 }, { line: 11, column: 16 }],
+        locations: [
+          { line: 7, column: 16 },
+          { line: 11, column: 16 },
+        ],
       },
     ]);
   });
@@ -1903,7 +1969,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Interface field AnotherInterface.field expects type String! but AnotherObject.field is type String.',
-        locations: [{ line: 7, column: 16 }, { line: 11, column: 16 }],
+        locations: [
+          { line: 7, column: 16 },
+          { line: 11, column: 16 },
+        ],
       },
     ]);
   });
@@ -1930,7 +1999,10 @@ describe('Objects must adhere to Interface they implement', () => {
       {
         message:
           'Type AnotherObject must implement SuperInterface because it is implemented by AnotherInterface.',
-        locations: [{ line: 10, column: 45 }, { line: 14, column: 37 }],
+        locations: [
+          { line: 10, column: 45 },
+          { line: 14, column: 37 },
+        ],
       },
     ]);
   });
@@ -2007,7 +2079,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Interface field ParentInterface.field expected but ChildInterface does not provide it.',
-        locations: [{ line: 7, column: 9 }, { line: 10, column: 7 }],
+        locations: [
+          { line: 7, column: 9 },
+          { line: 10, column: 7 },
+        ],
       },
     ]);
   });
@@ -2030,7 +2105,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Interface field ParentInterface.field expects type String but ChildInterface.field is type Int.',
-        locations: [{ line: 7, column: 31 }, { line: 11, column: 31 }],
+        locations: [
+          { line: 7, column: 31 },
+          { line: 11, column: 31 },
+        ],
       },
     ]);
   });
@@ -2056,7 +2134,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Interface field ParentInterface.field expects type A but ChildInterface.field is type B.',
-        locations: [{ line: 10, column: 16 }, { line: 14, column: 16 }],
+        locations: [
+          { line: 10, column: 16 },
+          { line: 14, column: 16 },
+        ],
       },
     ]);
   });
@@ -2119,7 +2200,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Interface field argument ParentInterface.field(input:) expected but ChildInterface.field does not provide it.',
-        locations: [{ line: 7, column: 15 }, { line: 11, column: 9 }],
+        locations: [
+          { line: 7, column: 15 },
+          { line: 11, column: 9 },
+        ],
       },
     ]);
   });
@@ -2142,7 +2226,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Interface field argument ParentInterface.field(input:) expects type String but ChildInterface.field(input:) is type Int.',
-        locations: [{ line: 7, column: 22 }, { line: 11, column: 22 }],
+        locations: [
+          { line: 7, column: 22 },
+          { line: 11, column: 22 },
+        ],
       },
     ]);
   });
@@ -2165,12 +2252,18 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Interface field ParentInterface.field expects type String but ChildInterface.field is type Int.',
-        locations: [{ line: 7, column: 31 }, { line: 11, column: 28 }],
+        locations: [
+          { line: 7, column: 31 },
+          { line: 11, column: 28 },
+        ],
       },
       {
         message:
           'Interface field argument ParentInterface.field(input:) expects type String but ChildInterface.field(input:) is type Int.',
-        locations: [{ line: 7, column: 22 }, { line: 11, column: 22 }],
+        locations: [
+          { line: 7, column: 22 },
+          { line: 11, column: 22 },
+        ],
       },
     ]);
   });
@@ -2198,7 +2291,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Object field ChildInterface.field includes required argument requiredArg that is missing from the Interface field ParentInterface.field.',
-        locations: [{ line: 13, column: 11 }, { line: 7, column: 9 }],
+        locations: [
+          { line: 13, column: 11 },
+          { line: 7, column: 9 },
+        ],
       },
     ]);
   });
@@ -2238,7 +2334,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Interface field ParentInterface.field expects type [String] but ChildInterface.field is type String.',
-        locations: [{ line: 7, column: 16 }, { line: 11, column: 16 }],
+        locations: [
+          { line: 7, column: 16 },
+          { line: 11, column: 16 },
+        ],
       },
     ]);
   });
@@ -2261,7 +2360,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Interface field ParentInterface.field expects type String but ChildInterface.field is type [String].',
-        locations: [{ line: 7, column: 16 }, { line: 11, column: 16 }],
+        locations: [
+          { line: 7, column: 16 },
+          { line: 11, column: 16 },
+        ],
       },
     ]);
   });
@@ -2301,7 +2403,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Interface field ParentInterface.field expects type String! but ChildInterface.field is type String.',
-        locations: [{ line: 7, column: 16 }, { line: 11, column: 16 }],
+        locations: [
+          { line: 7, column: 16 },
+          { line: 11, column: 16 },
+        ],
       },
     ]);
   });
@@ -2328,7 +2433,10 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Type ChildInterface must implement SuperInterface because it is implemented by ParentInterface.',
-        locations: [{ line: 10, column: 44 }, { line: 14, column: 43 }],
+        locations: [
+          { line: 10, column: 44 },
+          { line: 14, column: 43 },
+        ],
       },
     ]);
   });
@@ -2372,12 +2480,18 @@ describe('Interfaces must adhere to Interface they implement', () => {
       {
         message:
           'Type FooInterface cannot implement BarIntereface because it would create a circular reference.',
-        locations: [{ line: 10, column: 42 }, { line: 6, column: 41 }],
+        locations: [
+          { line: 10, column: 42 },
+          { line: 6, column: 41 },
+        ],
       },
       {
         message:
           'Type BarIntereface cannot implement FooInterface because it would create a circular reference.',
-        locations: [{ line: 6, column: 41 }, { line: 10, column: 42 }],
+        locations: [
+          { line: 6, column: 41 },
+          { line: 10, column: 42 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/NoFragmentCycles-test.js b/src/validation/__tests__/NoFragmentCycles-test.js
index 8f789709ff..8c882e15a1 100644
--- a/src/validation/__tests__/NoFragmentCycles-test.js
+++ b/src/validation/__tests__/NoFragmentCycles-test.js
@@ -103,7 +103,10 @@ describe('Validate: No circular fragment spreads', () => {
     `).to.deep.equal([
       {
         message: 'Cannot spread fragment "fragA" within itself via "fragB".',
-        locations: [{ line: 2, column: 31 }, { line: 3, column: 31 }],
+        locations: [
+          { line: 2, column: 31 },
+          { line: 3, column: 31 },
+        ],
       },
     ]);
   });
@@ -115,7 +118,10 @@ describe('Validate: No circular fragment spreads', () => {
     `).to.deep.equal([
       {
         message: 'Cannot spread fragment "fragB" within itself via "fragA".',
-        locations: [{ line: 2, column: 31 }, { line: 3, column: 31 }],
+        locations: [
+          { line: 2, column: 31 },
+          { line: 3, column: 31 },
+        ],
       },
     ]);
   });
@@ -135,7 +141,10 @@ describe('Validate: No circular fragment spreads', () => {
     `).to.deep.equal([
       {
         message: 'Cannot spread fragment "fragA" within itself via "fragB".',
-        locations: [{ line: 4, column: 11 }, { line: 9, column: 11 }],
+        locations: [
+          { line: 4, column: 11 },
+          { line: 9, column: 11 },
+        ],
       },
     ]);
   });
@@ -184,11 +193,17 @@ describe('Validate: No circular fragment spreads', () => {
     `).to.deep.equal([
       {
         message: 'Cannot spread fragment "fragA" within itself via "fragB".',
-        locations: [{ line: 2, column: 31 }, { line: 3, column: 31 }],
+        locations: [
+          { line: 2, column: 31 },
+          { line: 3, column: 31 },
+        ],
       },
       {
         message: 'Cannot spread fragment "fragA" within itself via "fragC".',
-        locations: [{ line: 2, column: 41 }, { line: 4, column: 31 }],
+        locations: [
+          { line: 2, column: 41 },
+          { line: 4, column: 31 },
+        ],
       },
     ]);
   });
@@ -201,11 +216,17 @@ describe('Validate: No circular fragment spreads', () => {
     `).to.deep.equal([
       {
         message: 'Cannot spread fragment "fragA" within itself via "fragC".',
-        locations: [{ line: 2, column: 31 }, { line: 4, column: 31 }],
+        locations: [
+          { line: 2, column: 31 },
+          { line: 4, column: 31 },
+        ],
       },
       {
         message: 'Cannot spread fragment "fragC" within itself via "fragB".',
-        locations: [{ line: 4, column: 41 }, { line: 3, column: 31 }],
+        locations: [
+          { line: 4, column: 41 },
+          { line: 3, column: 31 },
+        ],
       },
     ]);
   });
@@ -231,7 +252,10 @@ describe('Validate: No circular fragment spreads', () => {
       },
       {
         message: 'Cannot spread fragment "fragB" within itself via "fragC".',
-        locations: [{ line: 3, column: 41 }, { line: 4, column: 41 }],
+        locations: [
+          { line: 3, column: 41 },
+          { line: 4, column: 41 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/NoUndefinedVariables-test.js b/src/validation/__tests__/NoUndefinedVariables-test.js
index 88a2e7995f..d16b0b3e5c 100644
--- a/src/validation/__tests__/NoUndefinedVariables-test.js
+++ b/src/validation/__tests__/NoUndefinedVariables-test.js
@@ -124,7 +124,10 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$d" is not defined by operation "Foo".',
-        locations: [{ line: 3, column: 39 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 3, column: 39 },
+          { line: 2, column: 7 },
+        ],
       },
     ]);
   });
@@ -137,7 +140,10 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$a" is not defined.',
-        locations: [{ line: 3, column: 18 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 3, column: 18 },
+          { line: 2, column: 7 },
+        ],
       },
     ]);
   });
@@ -150,11 +156,17 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$a" is not defined by operation "Foo".',
-        locations: [{ line: 3, column: 18 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 3, column: 18 },
+          { line: 2, column: 7 },
+        ],
       },
       {
         message: 'Variable "$c" is not defined by operation "Foo".',
-        locations: [{ line: 3, column: 32 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 3, column: 32 },
+          { line: 2, column: 7 },
+        ],
       },
     ]);
   });
@@ -170,7 +182,10 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$a" is not defined.',
-        locations: [{ line: 6, column: 18 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 6, column: 18 },
+          { line: 2, column: 7 },
+        ],
       },
     ]);
   });
@@ -196,7 +211,10 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$c" is not defined by operation "Foo".',
-        locations: [{ line: 16, column: 18 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 16, column: 18 },
+          { line: 2, column: 7 },
+        ],
       },
     ]);
   });
@@ -222,11 +240,17 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$a" is not defined by operation "Foo".',
-        locations: [{ line: 6, column: 18 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 6, column: 18 },
+          { line: 2, column: 7 },
+        ],
       },
       {
         message: 'Variable "$c" is not defined by operation "Foo".',
-        locations: [{ line: 16, column: 18 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 16, column: 18 },
+          { line: 2, column: 7 },
+        ],
       },
     ]);
   });
@@ -245,11 +269,17 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$b" is not defined by operation "Foo".',
-        locations: [{ line: 9, column: 25 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 9, column: 25 },
+          { line: 2, column: 7 },
+        ],
       },
       {
         message: 'Variable "$b" is not defined by operation "Bar".',
-        locations: [{ line: 9, column: 25 }, { line: 5, column: 7 }],
+        locations: [
+          { line: 9, column: 25 },
+          { line: 5, column: 7 },
+        ],
       },
     ]);
   });
@@ -268,11 +298,17 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$a" is not defined by operation "Foo".',
-        locations: [{ line: 9, column: 18 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 9, column: 18 },
+          { line: 2, column: 7 },
+        ],
       },
       {
         message: 'Variable "$b" is not defined by operation "Bar".',
-        locations: [{ line: 9, column: 25 }, { line: 5, column: 7 }],
+        locations: [
+          { line: 9, column: 25 },
+          { line: 5, column: 7 },
+        ],
       },
     ]);
   });
@@ -294,11 +330,17 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$a" is not defined by operation "Foo".',
-        locations: [{ line: 9, column: 18 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 9, column: 18 },
+          { line: 2, column: 7 },
+        ],
       },
       {
         message: 'Variable "$b" is not defined by operation "Bar".',
-        locations: [{ line: 12, column: 18 }, { line: 5, column: 7 }],
+        locations: [
+          { line: 12, column: 18 },
+          { line: 5, column: 7 },
+        ],
       },
     ]);
   });
@@ -322,27 +364,45 @@ describe('Validate: No undefined variables', () => {
     `).to.deep.equal([
       {
         message: 'Variable "$a" is not defined by operation "Foo".',
-        locations: [{ line: 9, column: 19 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 9, column: 19 },
+          { line: 2, column: 7 },
+        ],
       },
       {
         message: 'Variable "$a" is not defined by operation "Foo".',
-        locations: [{ line: 11, column: 19 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 11, column: 19 },
+          { line: 2, column: 7 },
+        ],
       },
       {
         message: 'Variable "$c" is not defined by operation "Foo".',
-        locations: [{ line: 14, column: 19 }, { line: 2, column: 7 }],
+        locations: [
+          { line: 14, column: 19 },
+          { line: 2, column: 7 },
+        ],
       },
       {
         message: 'Variable "$b" is not defined by operation "Bar".',
-        locations: [{ line: 9, column: 26 }, { line: 5, column: 7 }],
+        locations: [
+          { line: 9, column: 26 },
+          { line: 5, column: 7 },
+        ],
       },
       {
         message: 'Variable "$b" is not defined by operation "Bar".',
-        locations: [{ line: 11, column: 26 }, { line: 5, column: 7 }],
+        locations: [
+          { line: 11, column: 26 },
+          { line: 5, column: 7 },
+        ],
       },
       {
         message: 'Variable "$c" is not defined by operation "Bar".',
-        locations: [{ line: 14, column: 19 }, { line: 5, column: 7 }],
+        locations: [
+          { line: 14, column: 19 },
+          { line: 5, column: 7 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/OverlappingFieldsCanBeMerged-test.js b/src/validation/__tests__/OverlappingFieldsCanBeMerged-test.js
index 23ead587b8..0a743bf550 100644
--- a/src/validation/__tests__/OverlappingFieldsCanBeMerged-test.js
+++ b/src/validation/__tests__/OverlappingFieldsCanBeMerged-test.js
@@ -108,7 +108,10 @@ describe('Validate: Overlapping fields can be merged', () => {
       {
         message:
           'Fields "fido" conflict because "name" and "nickname" are different fields. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 3, column: 9 }, { line: 4, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 4, column: 9 },
+        ],
       },
     ]);
   });
@@ -138,7 +141,10 @@ describe('Validate: Overlapping fields can be merged', () => {
       {
         message:
           'Fields "name" conflict because "nickname" and "name" are different fields. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 3, column: 9 }, { line: 4, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 4, column: 9 },
+        ],
       },
     ]);
   });
@@ -153,7 +159,10 @@ describe('Validate: Overlapping fields can be merged', () => {
       {
         message:
           'Fields "doesKnowCommand" conflict because they have differing arguments. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 3, column: 9 }, { line: 4, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 4, column: 9 },
+        ],
       },
     ]);
   });
@@ -168,7 +177,10 @@ describe('Validate: Overlapping fields can be merged', () => {
       {
         message:
           'Fields "doesKnowCommand" conflict because they have differing arguments. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 3, column: 9 }, { line: 4, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 4, column: 9 },
+        ],
       },
     ]);
   });
@@ -183,7 +195,10 @@ describe('Validate: Overlapping fields can be merged', () => {
       {
         message:
           'Fields "doesKnowCommand" conflict because they have differing arguments. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 3, column: 9 }, { line: 4, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 4, column: 9 },
+        ],
       },
     ]);
   });
@@ -219,7 +234,10 @@ describe('Validate: Overlapping fields can be merged', () => {
       {
         message:
           'Fields "x" conflict because "a" and "b" are different fields. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 7, column: 9 }, { line: 10, column: 9 }],
+        locations: [
+          { line: 7, column: 9 },
+          { line: 10, column: 9 },
+        ],
       },
     ]);
   });
@@ -251,17 +269,26 @@ describe('Validate: Overlapping fields can be merged', () => {
       {
         message:
           'Fields "x" conflict because "a" and "b" are different fields. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 18, column: 9 }, { line: 21, column: 9 }],
+        locations: [
+          { line: 18, column: 9 },
+          { line: 21, column: 9 },
+        ],
       },
       {
         message:
           'Fields "x" conflict because "c" and "a" are different fields. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 14, column: 11 }, { line: 18, column: 9 }],
+        locations: [
+          { line: 14, column: 11 },
+          { line: 18, column: 9 },
+        ],
       },
       {
         message:
           'Fields "x" conflict because "c" and "b" are different fields. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 14, column: 11 }, { line: 21, column: 9 }],
+        locations: [
+          { line: 14, column: 11 },
+          { line: 21, column: 9 },
+        ],
       },
     ]);
   });
@@ -560,7 +587,10 @@ describe('Validate: Overlapping fields can be merged', () => {
         {
           message:
             'Fields "scalar" conflict because they return conflicting types "Int" and "String!". Use different aliases on the fields to fetch both if this was intentional.',
-          locations: [{ line: 5, column: 17 }, { line: 8, column: 17 }],
+          locations: [
+            { line: 5, column: 17 },
+            { line: 8, column: 17 },
+          ],
         },
       ]);
     });
@@ -609,7 +639,10 @@ describe('Validate: Overlapping fields can be merged', () => {
         {
           message:
             'Fields "scalar" conflict because they return conflicting types "Int" and "String". Use different aliases on the fields to fetch both if this was intentional.',
-          locations: [{ line: 5, column: 17 }, { line: 8, column: 17 }],
+          locations: [
+            { line: 5, column: 17 },
+            { line: 8, column: 17 },
+          ],
         },
       ]);
     });
@@ -694,7 +727,10 @@ describe('Validate: Overlapping fields can be merged', () => {
         {
           message:
             'Fields "scalar" conflict because they return conflicting types "String!" and "String". Use different aliases on the fields to fetch both if this was intentional.',
-          locations: [{ line: 5, column: 17 }, { line: 8, column: 17 }],
+          locations: [
+            { line: 5, column: 17 },
+            { line: 8, column: 17 },
+          ],
         },
       ]);
     });
@@ -722,7 +758,10 @@ describe('Validate: Overlapping fields can be merged', () => {
         {
           message:
             'Fields "box" conflict because they return conflicting types "[StringBox]" and "StringBox". Use different aliases on the fields to fetch both if this was intentional.',
-          locations: [{ line: 5, column: 17 }, { line: 10, column: 17 }],
+          locations: [
+            { line: 5, column: 17 },
+            { line: 10, column: 17 },
+          ],
         },
       ]);
 
@@ -748,7 +787,10 @@ describe('Validate: Overlapping fields can be merged', () => {
         {
           message:
             'Fields "box" conflict because they return conflicting types "StringBox" and "[StringBox]". Use different aliases on the fields to fetch both if this was intentional.',
-          locations: [{ line: 5, column: 17 }, { line: 10, column: 17 }],
+          locations: [
+            { line: 5, column: 17 },
+            { line: 10, column: 17 },
+          ],
         },
       ]);
     });
@@ -777,7 +819,10 @@ describe('Validate: Overlapping fields can be merged', () => {
         {
           message:
             'Fields "val" conflict because "scalar" and "unrelatedField" are different fields. Use different aliases on the fields to fetch both if this was intentional.',
-          locations: [{ line: 6, column: 19 }, { line: 7, column: 19 }],
+          locations: [
+            { line: 6, column: 19 },
+            { line: 7, column: 19 },
+          ],
         },
       ]);
     });
@@ -977,7 +1022,10 @@ describe('Validate: Overlapping fields can be merged', () => {
       {
         message:
           'Fields "fido" conflict because "name" and "nickname" are different fields. Use different aliases on the fields to fetch both if this was intentional.',
-        locations: [{ line: 4, column: 9 }, { line: 5, column: 9 }],
+        locations: [
+          { line: 4, column: 9 },
+          { line: 5, column: 9 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/PossibleTypeExtensions-test.js b/src/validation/__tests__/PossibleTypeExtensions-test.js
index 2dd2406852..9493b9cfbb 100644
--- a/src/validation/__tests__/PossibleTypeExtensions-test.js
+++ b/src/validation/__tests__/PossibleTypeExtensions-test.js
@@ -136,27 +136,45 @@ describe('Validate: Possible type extensions', () => {
     `).to.deep.equal([
       {
         message: 'Cannot extend non-object type "FooScalar".',
-        locations: [{ line: 2, column: 7 }, { line: 9, column: 7 }],
+        locations: [
+          { line: 2, column: 7 },
+          { line: 9, column: 7 },
+        ],
       },
       {
         message: 'Cannot extend non-interface type "FooObject".',
-        locations: [{ line: 3, column: 7 }, { line: 10, column: 7 }],
+        locations: [
+          { line: 3, column: 7 },
+          { line: 10, column: 7 },
+        ],
       },
       {
         message: 'Cannot extend non-union type "FooInterface".',
-        locations: [{ line: 4, column: 7 }, { line: 11, column: 7 }],
+        locations: [
+          { line: 4, column: 7 },
+          { line: 11, column: 7 },
+        ],
       },
       {
         message: 'Cannot extend non-enum type "FooUnion".',
-        locations: [{ line: 5, column: 7 }, { line: 12, column: 7 }],
+        locations: [
+          { line: 5, column: 7 },
+          { line: 12, column: 7 },
+        ],
       },
       {
         message: 'Cannot extend non-input object type "FooEnum".',
-        locations: [{ line: 6, column: 7 }, { line: 13, column: 7 }],
+        locations: [
+          { line: 6, column: 7 },
+          { line: 13, column: 7 },
+        ],
       },
       {
         message: 'Cannot extend non-scalar type "FooInputObject".',
-        locations: [{ line: 7, column: 7 }, { line: 14, column: 7 }],
+        locations: [
+          { line: 7, column: 7 },
+          { line: 14, column: 7 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/SingleFieldSubscriptions-test.js b/src/validation/__tests__/SingleFieldSubscriptions-test.js
index b8d084f853..e70565b7db 100644
--- a/src/validation/__tests__/SingleFieldSubscriptions-test.js
+++ b/src/validation/__tests__/SingleFieldSubscriptions-test.js
@@ -64,7 +64,10 @@ describe('Validate: Subscriptions with single field', () => {
       {
         message:
           'Subscription "ImportantEmails" must select only one top level field.',
-        locations: [{ line: 4, column: 9 }, { line: 5, column: 9 }],
+        locations: [
+          { line: 4, column: 9 },
+          { line: 5, column: 9 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueArgumentNames-test.js b/src/validation/__tests__/UniqueArgumentNames-test.js
index a4396accbc..14cc877e0e 100644
--- a/src/validation/__tests__/UniqueArgumentNames-test.js
+++ b/src/validation/__tests__/UniqueArgumentNames-test.js
@@ -96,7 +96,10 @@ describe('Validate: Unique argument names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one argument named "arg1".',
-        locations: [{ line: 3, column: 15 }, { line: 3, column: 30 }],
+        locations: [
+          { line: 3, column: 15 },
+          { line: 3, column: 30 },
+        ],
       },
     ]);
   });
@@ -109,11 +112,17 @@ describe('Validate: Unique argument names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one argument named "arg1".',
-        locations: [{ line: 3, column: 15 }, { line: 3, column: 30 }],
+        locations: [
+          { line: 3, column: 15 },
+          { line: 3, column: 30 },
+        ],
       },
       {
         message: 'There can be only one argument named "arg1".',
-        locations: [{ line: 3, column: 15 }, { line: 3, column: 45 }],
+        locations: [
+          { line: 3, column: 15 },
+          { line: 3, column: 45 },
+        ],
       },
     ]);
   });
@@ -126,7 +135,10 @@ describe('Validate: Unique argument names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one argument named "arg1".',
-        locations: [{ line: 3, column: 26 }, { line: 3, column: 41 }],
+        locations: [
+          { line: 3, column: 26 },
+          { line: 3, column: 41 },
+        ],
       },
     ]);
   });
@@ -139,11 +151,17 @@ describe('Validate: Unique argument names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one argument named "arg1".',
-        locations: [{ line: 3, column: 26 }, { line: 3, column: 41 }],
+        locations: [
+          { line: 3, column: 26 },
+          { line: 3, column: 41 },
+        ],
       },
       {
         message: 'There can be only one argument named "arg1".',
-        locations: [{ line: 3, column: 26 }, { line: 3, column: 56 }],
+        locations: [
+          { line: 3, column: 26 },
+          { line: 3, column: 56 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueDirectiveNames-test.js b/src/validation/__tests__/UniqueDirectiveNames-test.js
index 02207a5d5e..8583de3a5e 100644
--- a/src/validation/__tests__/UniqueDirectiveNames-test.js
+++ b/src/validation/__tests__/UniqueDirectiveNames-test.js
@@ -55,7 +55,10 @@ describe('Validate: Unique directive names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one directive named "@foo".',
-        locations: [{ line: 2, column: 18 }, { line: 4, column: 18 }],
+        locations: [
+          { line: 2, column: 18 },
+          { line: 4, column: 18 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueDirectivesPerLocation-test.js b/src/validation/__tests__/UniqueDirectivesPerLocation-test.js
index 3a02c6ee94..d3ecbe2d93 100644
--- a/src/validation/__tests__/UniqueDirectivesPerLocation-test.js
+++ b/src/validation/__tests__/UniqueDirectivesPerLocation-test.js
@@ -108,7 +108,10 @@ describe('Validate: Directives Are Unique Per Location', () => {
       {
         message:
           'The directive "@directive" can only be used once at this location.',
-        locations: [{ line: 3, column: 15 }, { line: 3, column: 26 }],
+        locations: [
+          { line: 3, column: 15 },
+          { line: 3, column: 26 },
+        ],
       },
     ]);
   });
@@ -122,12 +125,18 @@ describe('Validate: Directives Are Unique Per Location', () => {
       {
         message:
           'The directive "@directive" can only be used once at this location.',
-        locations: [{ line: 3, column: 15 }, { line: 3, column: 26 }],
+        locations: [
+          { line: 3, column: 15 },
+          { line: 3, column: 26 },
+        ],
       },
       {
         message:
           'The directive "@directive" can only be used once at this location.',
-        locations: [{ line: 3, column: 15 }, { line: 3, column: 37 }],
+        locations: [
+          { line: 3, column: 15 },
+          { line: 3, column: 37 },
+        ],
       },
     ]);
   });
@@ -141,12 +150,18 @@ describe('Validate: Directives Are Unique Per Location', () => {
       {
         message:
           'The directive "@directiveA" can only be used once at this location.',
-        locations: [{ line: 3, column: 15 }, { line: 3, column: 39 }],
+        locations: [
+          { line: 3, column: 15 },
+          { line: 3, column: 39 },
+        ],
       },
       {
         message:
           'The directive "@directiveB" can only be used once at this location.',
-        locations: [{ line: 3, column: 27 }, { line: 3, column: 51 }],
+        locations: [
+          { line: 3, column: 27 },
+          { line: 3, column: 51 },
+        ],
       },
     ]);
   });
@@ -160,12 +175,18 @@ describe('Validate: Directives Are Unique Per Location', () => {
       {
         message:
           'The directive "@directive" can only be used once at this location.',
-        locations: [{ line: 2, column: 29 }, { line: 2, column: 40 }],
+        locations: [
+          { line: 2, column: 29 },
+          { line: 2, column: 40 },
+        ],
       },
       {
         message:
           'The directive "@directive" can only be used once at this location.',
-        locations: [{ line: 3, column: 15 }, { line: 3, column: 26 }],
+        locations: [
+          { line: 3, column: 15 },
+          { line: 3, column: 26 },
+        ],
       },
     ]);
   });
@@ -196,62 +217,98 @@ describe('Validate: Directives Are Unique Per Location', () => {
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 5, column: 14 }, { line: 5, column: 29 }],
+        locations: [
+          { line: 5, column: 14 },
+          { line: 5, column: 29 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 6, column: 21 }, { line: 6, column: 36 }],
+        locations: [
+          { line: 6, column: 21 },
+          { line: 6, column: 36 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 8, column: 25 }, { line: 8, column: 40 }],
+        locations: [
+          { line: 8, column: 25 },
+          { line: 8, column: 40 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 9, column: 32 }, { line: 9, column: 47 }],
+        locations: [
+          { line: 9, column: 32 },
+          { line: 9, column: 47 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 11, column: 23 }, { line: 11, column: 38 }],
+        locations: [
+          { line: 11, column: 23 },
+          { line: 11, column: 38 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 12, column: 30 }, { line: 12, column: 45 }],
+        locations: [
+          { line: 12, column: 30 },
+          { line: 12, column: 45 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 14, column: 31 }, { line: 14, column: 46 }],
+        locations: [
+          { line: 14, column: 31 },
+          { line: 14, column: 46 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 15, column: 38 }, { line: 15, column: 53 }],
+        locations: [
+          { line: 15, column: 38 },
+          { line: 15, column: 53 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 17, column: 23 }, { line: 17, column: 38 }],
+        locations: [
+          { line: 17, column: 23 },
+          { line: 17, column: 38 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 18, column: 30 }, { line: 18, column: 45 }],
+        locations: [
+          { line: 18, column: 30 },
+          { line: 18, column: 45 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 20, column: 23 }, { line: 20, column: 38 }],
+        locations: [
+          { line: 20, column: 23 },
+          { line: 20, column: 38 },
+        ],
       },
       {
         message:
           'The directive "@nonRepeatable" can only be used once at this location.',
-        locations: [{ line: 21, column: 30 }, { line: 21, column: 45 }],
+        locations: [
+          { line: 21, column: 30 },
+          { line: 21, column: 45 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueEnumValueNames-test.js b/src/validation/__tests__/UniqueEnumValueNames-test.js
index 98ff97a3f4..0a1429fe76 100644
--- a/src/validation/__tests__/UniqueEnumValueNames-test.js
+++ b/src/validation/__tests__/UniqueEnumValueNames-test.js
@@ -50,7 +50,10 @@ describe('Validate: Unique enum value names', () => {
     `).to.deep.equal([
       {
         message: 'Enum value "SomeEnum.FOO" can only be defined once.',
-        locations: [{ line: 3, column: 9 }, { line: 5, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 5, column: 9 },
+        ],
       },
     ]);
   });
@@ -80,7 +83,10 @@ describe('Validate: Unique enum value names', () => {
     `).to.deep.equal([
       {
         message: 'Enum value "SomeEnum.FOO" can only be defined once.',
-        locations: [{ line: 3, column: 9 }, { line: 6, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 6, column: 9 },
+        ],
       },
     ]);
   });
@@ -96,7 +102,10 @@ describe('Validate: Unique enum value names', () => {
     `).to.deep.equal([
       {
         message: 'Enum value "SomeEnum.FOO" can only be defined once.',
-        locations: [{ line: 4, column: 9 }, { line: 6, column: 9 }],
+        locations: [
+          { line: 4, column: 9 },
+          { line: 6, column: 9 },
+        ],
       },
     ]);
   });
@@ -113,7 +122,10 @@ describe('Validate: Unique enum value names', () => {
     `).to.deep.equal([
       {
         message: 'Enum value "SomeEnum.FOO" can only be defined once.',
-        locations: [{ line: 4, column: 9 }, { line: 7, column: 9 }],
+        locations: [
+          { line: 4, column: 9 },
+          { line: 7, column: 9 },
+        ],
       },
     ]);
   });
@@ -172,7 +184,10 @@ describe('Validate: Unique enum value names', () => {
     expectSDLErrors(sdl, schema).to.deep.equal([
       {
         message: 'Enum value "SomeEnum.FOO" can only be defined once.',
-        locations: [{ line: 3, column: 9 }, { line: 6, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 6, column: 9 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueFieldDefinitionNames-test.js b/src/validation/__tests__/UniqueFieldDefinitionNames-test.js
index c3ff9a73cc..69cd1594f7 100644
--- a/src/validation/__tests__/UniqueFieldDefinitionNames-test.js
+++ b/src/validation/__tests__/UniqueFieldDefinitionNames-test.js
@@ -82,15 +82,24 @@ describe('Validate: Unique field definition names', () => {
     `).to.deep.equal([
       {
         message: 'Field "SomeObject.foo" can only be defined once.',
-        locations: [{ line: 3, column: 9 }, { line: 5, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 5, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInterface.foo" can only be defined once.',
-        locations: [{ line: 9, column: 9 }, { line: 11, column: 9 }],
+        locations: [
+          { line: 9, column: 9 },
+          { line: 11, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInputObject.foo" can only be defined once.',
-        locations: [{ line: 15, column: 9 }, { line: 17, column: 9 }],
+        locations: [
+          { line: 15, column: 9 },
+          { line: 17, column: 9 },
+        ],
       },
     ]);
   });
@@ -154,15 +163,24 @@ describe('Validate: Unique field definition names', () => {
     `).to.deep.equal([
       {
         message: 'Field "SomeObject.foo" can only be defined once.',
-        locations: [{ line: 3, column: 9 }, { line: 6, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 6, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInterface.foo" can only be defined once.',
-        locations: [{ line: 10, column: 9 }, { line: 13, column: 9 }],
+        locations: [
+          { line: 10, column: 9 },
+          { line: 13, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInputObject.foo" can only be defined once.',
-        locations: [{ line: 17, column: 9 }, { line: 20, column: 9 }],
+        locations: [
+          { line: 17, column: 9 },
+          { line: 20, column: 9 },
+        ],
       },
     ]);
   });
@@ -192,15 +210,24 @@ describe('Validate: Unique field definition names', () => {
     `).to.deep.equal([
       {
         message: 'Field "SomeObject.foo" can only be defined once.',
-        locations: [{ line: 4, column: 9 }, { line: 6, column: 9 }],
+        locations: [
+          { line: 4, column: 9 },
+          { line: 6, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInterface.foo" can only be defined once.',
-        locations: [{ line: 11, column: 9 }, { line: 13, column: 9 }],
+        locations: [
+          { line: 11, column: 9 },
+          { line: 13, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInputObject.foo" can only be defined once.',
-        locations: [{ line: 18, column: 9 }, { line: 20, column: 9 }],
+        locations: [
+          { line: 18, column: 9 },
+          { line: 20, column: 9 },
+        ],
       },
     ]);
   });
@@ -233,15 +260,24 @@ describe('Validate: Unique field definition names', () => {
     `).to.deep.equal([
       {
         message: 'Field "SomeObject.foo" can only be defined once.',
-        locations: [{ line: 4, column: 9 }, { line: 7, column: 9 }],
+        locations: [
+          { line: 4, column: 9 },
+          { line: 7, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInterface.foo" can only be defined once.',
-        locations: [{ line: 12, column: 9 }, { line: 15, column: 9 }],
+        locations: [
+          { line: 12, column: 9 },
+          { line: 15, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInputObject.foo" can only be defined once.',
-        locations: [{ line: 20, column: 9 }, { line: 23, column: 9 }],
+        locations: [
+          { line: 20, column: 9 },
+          { line: 23, column: 9 },
+        ],
       },
     ]);
   });
@@ -371,15 +407,24 @@ describe('Validate: Unique field definition names', () => {
     expectSDLErrors(sdl, schema).to.deep.equal([
       {
         message: 'Field "SomeObject.foo" can only be defined once.',
-        locations: [{ line: 3, column: 9 }, { line: 6, column: 9 }],
+        locations: [
+          { line: 3, column: 9 },
+          { line: 6, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInterface.foo" can only be defined once.',
-        locations: [{ line: 10, column: 9 }, { line: 13, column: 9 }],
+        locations: [
+          { line: 10, column: 9 },
+          { line: 13, column: 9 },
+        ],
       },
       {
         message: 'Field "SomeInputObject.foo" can only be defined once.',
-        locations: [{ line: 17, column: 9 }, { line: 20, column: 9 }],
+        locations: [
+          { line: 17, column: 9 },
+          { line: 20, column: 9 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueFragmentNames-test.js b/src/validation/__tests__/UniqueFragmentNames-test.js
index af5298059a..91fbea96fd 100644
--- a/src/validation/__tests__/UniqueFragmentNames-test.js
+++ b/src/validation/__tests__/UniqueFragmentNames-test.js
@@ -92,7 +92,10 @@ describe('Validate: Unique fragment names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one fragment named "fragA".',
-        locations: [{ line: 5, column: 16 }, { line: 8, column: 16 }],
+        locations: [
+          { line: 5, column: 16 },
+          { line: 8, column: 16 },
+        ],
       },
     ]);
   });
@@ -108,7 +111,10 @@ describe('Validate: Unique fragment names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one fragment named "fragA".',
-        locations: [{ line: 2, column: 16 }, { line: 5, column: 16 }],
+        locations: [
+          { line: 2, column: 16 },
+          { line: 5, column: 16 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueInputFieldNames-test.js b/src/validation/__tests__/UniqueInputFieldNames-test.js
index 4286026c5c..c2c37ffb3f 100644
--- a/src/validation/__tests__/UniqueInputFieldNames-test.js
+++ b/src/validation/__tests__/UniqueInputFieldNames-test.js
@@ -63,7 +63,10 @@ describe('Validate: Unique input field names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one input field named "f1".',
-        locations: [{ line: 3, column: 22 }, { line: 3, column: 35 }],
+        locations: [
+          { line: 3, column: 22 },
+          { line: 3, column: 35 },
+        ],
       },
     ]);
   });
@@ -76,11 +79,17 @@ describe('Validate: Unique input field names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one input field named "f1".',
-        locations: [{ line: 3, column: 22 }, { line: 3, column: 35 }],
+        locations: [
+          { line: 3, column: 22 },
+          { line: 3, column: 35 },
+        ],
       },
       {
         message: 'There can be only one input field named "f1".',
-        locations: [{ line: 3, column: 22 }, { line: 3, column: 48 }],
+        locations: [
+          { line: 3, column: 22 },
+          { line: 3, column: 48 },
+        ],
       },
     ]);
   });
@@ -93,7 +102,10 @@ describe('Validate: Unique input field names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one input field named "f2".',
-        locations: [{ line: 3, column: 27 }, { line: 3, column: 40 }],
+        locations: [
+          { line: 3, column: 27 },
+          { line: 3, column: 40 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueOperationNames-test.js b/src/validation/__tests__/UniqueOperationNames-test.js
index ed5331802c..533c144728 100644
--- a/src/validation/__tests__/UniqueOperationNames-test.js
+++ b/src/validation/__tests__/UniqueOperationNames-test.js
@@ -89,7 +89,10 @@ describe('Validate: Unique operation names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one operation named "Foo".',
-        locations: [{ line: 2, column: 13 }, { line: 5, column: 13 }],
+        locations: [
+          { line: 2, column: 13 },
+          { line: 5, column: 13 },
+        ],
       },
     ]);
   });
@@ -105,7 +108,10 @@ describe('Validate: Unique operation names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one operation named "Foo".',
-        locations: [{ line: 2, column: 13 }, { line: 5, column: 16 }],
+        locations: [
+          { line: 2, column: 13 },
+          { line: 5, column: 16 },
+        ],
       },
     ]);
   });
@@ -121,7 +127,10 @@ describe('Validate: Unique operation names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one operation named "Foo".',
-        locations: [{ line: 2, column: 13 }, { line: 5, column: 20 }],
+        locations: [
+          { line: 2, column: 13 },
+          { line: 5, column: 20 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueOperationTypes-test.js b/src/validation/__tests__/UniqueOperationTypes-test.js
index ea8cd95590..5819d56357 100644
--- a/src/validation/__tests__/UniqueOperationTypes-test.js
+++ b/src/validation/__tests__/UniqueOperationTypes-test.js
@@ -85,15 +85,24 @@ describe('Validate: Unique operation types', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one query type in schema.',
-        locations: [{ line: 5, column: 9 }, { line: 9, column: 9 }],
+        locations: [
+          { line: 5, column: 9 },
+          { line: 9, column: 9 },
+        ],
       },
       {
         message: 'There can be only one mutation type in schema.',
-        locations: [{ line: 6, column: 9 }, { line: 10, column: 9 }],
+        locations: [
+          { line: 6, column: 9 },
+          { line: 10, column: 9 },
+        ],
       },
       {
         message: 'There can be only one subscription type in schema.',
-        locations: [{ line: 7, column: 9 }, { line: 11, column: 9 }],
+        locations: [
+          { line: 7, column: 9 },
+          { line: 11, column: 9 },
+        ],
       },
     ]);
   });
@@ -116,15 +125,24 @@ describe('Validate: Unique operation types', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one query type in schema.',
-        locations: [{ line: 5, column: 9 }, { line: 11, column: 9 }],
+        locations: [
+          { line: 5, column: 9 },
+          { line: 11, column: 9 },
+        ],
       },
       {
         message: 'There can be only one mutation type in schema.',
-        locations: [{ line: 6, column: 9 }, { line: 12, column: 9 }],
+        locations: [
+          { line: 6, column: 9 },
+          { line: 12, column: 9 },
+        ],
       },
       {
         message: 'There can be only one subscription type in schema.',
-        locations: [{ line: 7, column: 9 }, { line: 13, column: 9 }],
+        locations: [
+          { line: 7, column: 9 },
+          { line: 13, column: 9 },
+        ],
       },
     ]);
   });
@@ -153,27 +171,45 @@ describe('Validate: Unique operation types', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one query type in schema.',
-        locations: [{ line: 5, column: 9 }, { line: 11, column: 9 }],
+        locations: [
+          { line: 5, column: 9 },
+          { line: 11, column: 9 },
+        ],
       },
       {
         message: 'There can be only one mutation type in schema.',
-        locations: [{ line: 6, column: 9 }, { line: 12, column: 9 }],
+        locations: [
+          { line: 6, column: 9 },
+          { line: 12, column: 9 },
+        ],
       },
       {
         message: 'There can be only one subscription type in schema.',
-        locations: [{ line: 7, column: 9 }, { line: 13, column: 9 }],
+        locations: [
+          { line: 7, column: 9 },
+          { line: 13, column: 9 },
+        ],
       },
       {
         message: 'There can be only one query type in schema.',
-        locations: [{ line: 5, column: 9 }, { line: 17, column: 9 }],
+        locations: [
+          { line: 5, column: 9 },
+          { line: 17, column: 9 },
+        ],
       },
       {
         message: 'There can be only one mutation type in schema.',
-        locations: [{ line: 6, column: 9 }, { line: 18, column: 9 }],
+        locations: [
+          { line: 6, column: 9 },
+          { line: 18, column: 9 },
+        ],
       },
       {
         message: 'There can be only one subscription type in schema.',
-        locations: [{ line: 7, column: 9 }, { line: 19, column: 9 }],
+        locations: [
+          { line: 7, column: 9 },
+          { line: 19, column: 9 },
+        ],
       },
     ]);
   });
@@ -199,15 +235,24 @@ describe('Validate: Unique operation types', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one query type in schema.',
-        locations: [{ line: 5, column: 9 }, { line: 14, column: 9 }],
+        locations: [
+          { line: 5, column: 9 },
+          { line: 14, column: 9 },
+        ],
       },
       {
         message: 'There can be only one mutation type in schema.',
-        locations: [{ line: 9, column: 9 }, { line: 15, column: 9 }],
+        locations: [
+          { line: 9, column: 9 },
+          { line: 15, column: 9 },
+        ],
       },
       {
         message: 'There can be only one subscription type in schema.',
-        locations: [{ line: 10, column: 9 }, { line: 16, column: 9 }],
+        locations: [
+          { line: 10, column: 9 },
+          { line: 16, column: 9 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueTypeNames-test.js b/src/validation/__tests__/UniqueTypeNames-test.js
index 2acc9cf678..9f610e6ade 100644
--- a/src/validation/__tests__/UniqueTypeNames-test.js
+++ b/src/validation/__tests__/UniqueTypeNames-test.js
@@ -60,27 +60,45 @@ describe('Validate: Unique type names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one type named "Foo".',
-        locations: [{ line: 2, column: 12 }, { line: 4, column: 14 }],
+        locations: [
+          { line: 2, column: 12 },
+          { line: 4, column: 14 },
+        ],
       },
       {
         message: 'There can be only one type named "Foo".',
-        locations: [{ line: 2, column: 12 }, { line: 5, column: 12 }],
+        locations: [
+          { line: 2, column: 12 },
+          { line: 5, column: 12 },
+        ],
       },
       {
         message: 'There can be only one type named "Foo".',
-        locations: [{ line: 2, column: 12 }, { line: 6, column: 17 }],
+        locations: [
+          { line: 2, column: 12 },
+          { line: 6, column: 17 },
+        ],
       },
       {
         message: 'There can be only one type named "Foo".',
-        locations: [{ line: 2, column: 12 }, { line: 7, column: 13 }],
+        locations: [
+          { line: 2, column: 12 },
+          { line: 7, column: 13 },
+        ],
       },
       {
         message: 'There can be only one type named "Foo".',
-        locations: [{ line: 2, column: 12 }, { line: 8, column: 12 }],
+        locations: [
+          { line: 2, column: 12 },
+          { line: 8, column: 12 },
+        ],
       },
       {
         message: 'There can be only one type named "Foo".',
-        locations: [{ line: 2, column: 12 }, { line: 9, column: 13 }],
+        locations: [
+          { line: 2, column: 12 },
+          { line: 9, column: 13 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/UniqueVariableNames-test.js b/src/validation/__tests__/UniqueVariableNames-test.js
index 6ce25ac700..902ef382cc 100644
--- a/src/validation/__tests__/UniqueVariableNames-test.js
+++ b/src/validation/__tests__/UniqueVariableNames-test.js
@@ -30,19 +30,31 @@ describe('Validate: Unique variable names', () => {
     `).to.deep.equal([
       {
         message: 'There can be only one variable named "$x".',
-        locations: [{ line: 2, column: 16 }, { line: 2, column: 25 }],
+        locations: [
+          { line: 2, column: 16 },
+          { line: 2, column: 25 },
+        ],
       },
       {
         message: 'There can be only one variable named "$x".',
-        locations: [{ line: 2, column: 16 }, { line: 2, column: 34 }],
+        locations: [
+          { line: 2, column: 16 },
+          { line: 2, column: 34 },
+        ],
       },
       {
         message: 'There can be only one variable named "$x".',
-        locations: [{ line: 3, column: 16 }, { line: 3, column: 28 }],
+        locations: [
+          { line: 3, column: 16 },
+          { line: 3, column: 28 },
+        ],
       },
       {
         message: 'There can be only one variable named "$x".',
-        locations: [{ line: 4, column: 16 }, { line: 4, column: 25 }],
+        locations: [
+          { line: 4, column: 16 },
+          { line: 4, column: 25 },
+        ],
       },
     ]);
   });
diff --git a/src/validation/__tests__/VariablesInAllowedPosition-test.js b/src/validation/__tests__/VariablesInAllowedPosition-test.js
index ab58bb6f08..31c5c79235 100644
--- a/src/validation/__tests__/VariablesInAllowedPosition-test.js
+++ b/src/validation/__tests__/VariablesInAllowedPosition-test.js
@@ -164,7 +164,10 @@ describe('Validate: Variables are in allowed positions', () => {
       {
         message:
           'Variable "$intArg" of type "Int" used in position expecting type "Int!".',
-        locations: [{ line: 2, column: 19 }, { line: 4, column: 45 }],
+        locations: [
+          { line: 2, column: 19 },
+          { line: 4, column: 45 },
+        ],
       },
     ]);
   });
@@ -184,7 +187,10 @@ describe('Validate: Variables are in allowed positions', () => {
       {
         message:
           'Variable "$intArg" of type "Int" used in position expecting type "Int!".',
-        locations: [{ line: 6, column: 19 }, { line: 3, column: 43 }],
+        locations: [
+          { line: 6, column: 19 },
+          { line: 3, column: 43 },
+        ],
       },
     ]);
   });
@@ -208,7 +214,10 @@ describe('Validate: Variables are in allowed positions', () => {
       {
         message:
           'Variable "$intArg" of type "Int" used in position expecting type "Int!".',
-        locations: [{ line: 10, column: 19 }, { line: 7, column: 43 }],
+        locations: [
+          { line: 10, column: 19 },
+          { line: 7, column: 43 },
+        ],
       },
     ]);
   });
@@ -224,7 +233,10 @@ describe('Validate: Variables are in allowed positions', () => {
       {
         message:
           'Variable "$stringVar" of type "String" used in position expecting type "Boolean".',
-        locations: [{ line: 2, column: 19 }, { line: 4, column: 39 }],
+        locations: [
+          { line: 2, column: 19 },
+          { line: 4, column: 39 },
+        ],
       },
     ]);
   });
@@ -240,7 +252,10 @@ describe('Validate: Variables are in allowed positions', () => {
       {
         message:
           'Variable "$stringVar" of type "String" used in position expecting type "[String]".',
-        locations: [{ line: 2, column: 19 }, { line: 4, column: 45 }],
+        locations: [
+          { line: 2, column: 19 },
+          { line: 4, column: 45 },
+        ],
       },
     ]);
   });
@@ -254,7 +269,10 @@ describe('Validate: Variables are in allowed positions', () => {
       {
         message:
           'Variable "$boolVar" of type "Boolean" used in position expecting type "Boolean!".',
-        locations: [{ line: 2, column: 19 }, { line: 3, column: 26 }],
+        locations: [
+          { line: 2, column: 19 },
+          { line: 3, column: 26 },
+        ],
       },
     ]);
   });
@@ -268,7 +286,10 @@ describe('Validate: Variables are in allowed positions', () => {
       {
         message:
           'Variable "$stringVar" of type "String" used in position expecting type "Boolean!".',
-        locations: [{ line: 2, column: 19 }, { line: 3, column: 26 }],
+        locations: [
+          { line: 2, column: 19 },
+          { line: 3, column: 26 },
+        ],
       },
     ]);
   });
@@ -285,7 +306,10 @@ describe('Validate: Variables are in allowed positions', () => {
       {
         message:
           'Variable "$stringListVar" of type "[String]" used in position expecting type "[String!]".',
-        locations: [{ line: 2, column: 19 }, { line: 5, column: 59 }],
+        locations: [
+          { line: 2, column: 19 },
+          { line: 5, column: 59 },
+        ],
       },
     ]);
   });
@@ -302,7 +326,10 @@ describe('Validate: Variables are in allowed positions', () => {
         {
           message:
             'Variable "$intVar" of type "Int" used in position expecting type "Int!".',
-          locations: [{ line: 2, column: 21 }, { line: 4, column: 47 }],
+          locations: [
+            { line: 2, column: 21 },
+            { line: 4, column: 47 },
+          ],
         },
       ]);
     });
diff --git a/src/validation/index.d.ts b/src/validation/index.d.ts
index 3c6d260df6..c4e38f5940 100644
--- a/src/validation/index.d.ts
+++ b/src/validation/index.d.ts
@@ -5,122 +5,76 @@ export { ValidationContext, ValidationRule } from './ValidationContext';
 export { specifiedRules } from './specifiedRules';
 
 // Spec Section: "Field Selections on Objects, Interfaces, and Unions Types"
-export {
-  FieldsOnCorrectType as FieldsOnCorrectTypeRule,
-} from './rules/FieldsOnCorrectType';
+export { FieldsOnCorrectType as FieldsOnCorrectTypeRule } from './rules/FieldsOnCorrectType';
 
 // Spec Section: "Fragments on Composite Types"
-export {
-  FragmentsOnCompositeTypes as FragmentsOnCompositeTypesRule,
-} from './rules/FragmentsOnCompositeTypes';
+export { FragmentsOnCompositeTypes as FragmentsOnCompositeTypesRule } from './rules/FragmentsOnCompositeTypes';
 
 // Spec Section: "Argument Names"
-export {
-  KnownArgumentNames as KnownArgumentNamesRule,
-} from './rules/KnownArgumentNames';
+export { KnownArgumentNames as KnownArgumentNamesRule } from './rules/KnownArgumentNames';
 
 // Spec Section: "Directives Are Defined"
-export {
-  KnownDirectives as KnownDirectivesRule,
-} from './rules/KnownDirectives';
+export { KnownDirectives as KnownDirectivesRule } from './rules/KnownDirectives';
 
 // Spec Section: "Fragment spread target defined"
-export {
-  KnownFragmentNames as KnownFragmentNamesRule,
-} from './rules/KnownFragmentNames';
+export { KnownFragmentNames as KnownFragmentNamesRule } from './rules/KnownFragmentNames';
 
 // Spec Section: "Fragment Spread Type Existence"
 export { KnownTypeNames as KnownTypeNamesRule } from './rules/KnownTypeNames';
 
 // Spec Section: "Lone Anonymous Operation"
-export {
-  LoneAnonymousOperation as LoneAnonymousOperationRule,
-} from './rules/LoneAnonymousOperation';
+export { LoneAnonymousOperation as LoneAnonymousOperationRule } from './rules/LoneAnonymousOperation';
 
 // Spec Section: "Fragments must not form cycles"
-export {
-  NoFragmentCycles as NoFragmentCyclesRule,
-} from './rules/NoFragmentCycles';
+export { NoFragmentCycles as NoFragmentCyclesRule } from './rules/NoFragmentCycles';
 
 // Spec Section: "All Variable Used Defined"
-export {
-  NoUndefinedVariables as NoUndefinedVariablesRule,
-} from './rules/NoUndefinedVariables';
+export { NoUndefinedVariables as NoUndefinedVariablesRule } from './rules/NoUndefinedVariables';
 
 // Spec Section: "Fragments must be used"
-export {
-  NoUnusedFragments as NoUnusedFragmentsRule,
-} from './rules/NoUnusedFragments';
+export { NoUnusedFragments as NoUnusedFragmentsRule } from './rules/NoUnusedFragments';
 
 // Spec Section: "All Variables Used"
-export {
-  NoUnusedVariables as NoUnusedVariablesRule,
-} from './rules/NoUnusedVariables';
+export { NoUnusedVariables as NoUnusedVariablesRule } from './rules/NoUnusedVariables';
 
 // Spec Section: "Field Selection Merging"
-export {
-  OverlappingFieldsCanBeMerged as OverlappingFieldsCanBeMergedRule,
-} from './rules/OverlappingFieldsCanBeMerged';
+export { OverlappingFieldsCanBeMerged as OverlappingFieldsCanBeMergedRule } from './rules/OverlappingFieldsCanBeMerged';
 
 // Spec Section: "Fragment spread is possible"
-export {
-  PossibleFragmentSpreads as PossibleFragmentSpreadsRule,
-} from './rules/PossibleFragmentSpreads';
+export { PossibleFragmentSpreads as PossibleFragmentSpreadsRule } from './rules/PossibleFragmentSpreads';
 
 // Spec Section: "Argument Optionality"
-export {
-  ProvidedRequiredArguments as ProvidedRequiredArgumentsRule,
-} from './rules/ProvidedRequiredArguments';
+export { ProvidedRequiredArguments as ProvidedRequiredArgumentsRule } from './rules/ProvidedRequiredArguments';
 
 // Spec Section: "Leaf Field Selections"
 export { ScalarLeafs as ScalarLeafsRule } from './rules/ScalarLeafs';
 
 // Spec Section: "Subscriptions with Single Root Field"
-export {
-  SingleFieldSubscriptions as SingleFieldSubscriptionsRule,
-} from './rules/SingleFieldSubscriptions';
+export { SingleFieldSubscriptions as SingleFieldSubscriptionsRule } from './rules/SingleFieldSubscriptions';
 
 // Spec Section: "Argument Uniqueness"
-export {
-  UniqueArgumentNames as UniqueArgumentNamesRule,
-} from './rules/UniqueArgumentNames';
+export { UniqueArgumentNames as UniqueArgumentNamesRule } from './rules/UniqueArgumentNames';
 
 // Spec Section: "Directives Are Unique Per Location"
-export {
-  UniqueDirectivesPerLocation as UniqueDirectivesPerLocationRule,
-} from './rules/UniqueDirectivesPerLocation';
+export { UniqueDirectivesPerLocation as UniqueDirectivesPerLocationRule } from './rules/UniqueDirectivesPerLocation';
 
 // Spec Section: "Fragment Name Uniqueness"
-export {
-  UniqueFragmentNames as UniqueFragmentNamesRule,
-} from './rules/UniqueFragmentNames';
+export { UniqueFragmentNames as UniqueFragmentNamesRule } from './rules/UniqueFragmentNames';
 
 // Spec Section: "Input Object Field Uniqueness"
-export {
-  UniqueInputFieldNames as UniqueInputFieldNamesRule,
-} from './rules/UniqueInputFieldNames';
+export { UniqueInputFieldNames as UniqueInputFieldNamesRule } from './rules/UniqueInputFieldNames';
 
 // Spec Section: "Operation Name Uniqueness"
-export {
-  UniqueOperationNames as UniqueOperationNamesRule,
-} from './rules/UniqueOperationNames';
+export { UniqueOperationNames as UniqueOperationNamesRule } from './rules/UniqueOperationNames';
 
 // Spec Section: "Variable Uniqueness"
-export {
-  UniqueVariableNames as UniqueVariableNamesRule,
-} from './rules/UniqueVariableNames';
+export { UniqueVariableNames as UniqueVariableNamesRule } from './rules/UniqueVariableNames';
 
 // Spec Section: "Values Type Correctness"
-export {
-  ValuesOfCorrectType as ValuesOfCorrectTypeRule,
-} from './rules/ValuesOfCorrectType';
+export { ValuesOfCorrectType as ValuesOfCorrectTypeRule } from './rules/ValuesOfCorrectType';
 
 // Spec Section: "Variables are Input Types"
-export {
-  VariablesAreInputTypes as VariablesAreInputTypesRule,
-} from './rules/VariablesAreInputTypes';
+export { VariablesAreInputTypes as VariablesAreInputTypesRule } from './rules/VariablesAreInputTypes';
 
 // Spec Section: "All Variable Usages Are Allowed"
-export {
-  VariablesInAllowedPosition as VariablesInAllowedPositionRule,
-} from './rules/VariablesInAllowedPosition';
+export { VariablesInAllowedPosition as VariablesInAllowedPositionRule } from './rules/VariablesInAllowedPosition';
diff --git a/src/validation/index.js b/src/validation/index.js
index 16fc9bf2fa..55dfb26742 100644
--- a/src/validation/index.js
+++ b/src/validation/index.js
@@ -9,122 +9,76 @@ export type { ValidationRule } from './ValidationContext';
 export { specifiedRules } from './specifiedRules';
 
 // Spec Section: "Field Selections on Objects, Interfaces, and Unions Types"
-export {
-  FieldsOnCorrectType as FieldsOnCorrectTypeRule,
-} from './rules/FieldsOnCorrectType';
+export { FieldsOnCorrectType as FieldsOnCorrectTypeRule } from './rules/FieldsOnCorrectType';
 
 // Spec Section: "Fragments on Composite Types"
-export {
-  FragmentsOnCompositeTypes as FragmentsOnCompositeTypesRule,
-} from './rules/FragmentsOnCompositeTypes';
+export { FragmentsOnCompositeTypes as FragmentsOnCompositeTypesRule } from './rules/FragmentsOnCompositeTypes';
 
 // Spec Section: "Argument Names"
-export {
-  KnownArgumentNames as KnownArgumentNamesRule,
-} from './rules/KnownArgumentNames';
+export { KnownArgumentNames as KnownArgumentNamesRule } from './rules/KnownArgumentNames';
 
 // Spec Section: "Directives Are Defined"
-export {
-  KnownDirectives as KnownDirectivesRule,
-} from './rules/KnownDirectives';
+export { KnownDirectives as KnownDirectivesRule } from './rules/KnownDirectives';
 
 // Spec Section: "Fragment spread target defined"
-export {
-  KnownFragmentNames as KnownFragmentNamesRule,
-} from './rules/KnownFragmentNames';
+export { KnownFragmentNames as KnownFragmentNamesRule } from './rules/KnownFragmentNames';
 
 // Spec Section: "Fragment Spread Type Existence"
 export { KnownTypeNames as KnownTypeNamesRule } from './rules/KnownTypeNames';
 
 // Spec Section: "Lone Anonymous Operation"
-export {
-  LoneAnonymousOperation as LoneAnonymousOperationRule,
-} from './rules/LoneAnonymousOperation';
+export { LoneAnonymousOperation as LoneAnonymousOperationRule } from './rules/LoneAnonymousOperation';
 
 // Spec Section: "Fragments must not form cycles"
-export {
-  NoFragmentCycles as NoFragmentCyclesRule,
-} from './rules/NoFragmentCycles';
+export { NoFragmentCycles as NoFragmentCyclesRule } from './rules/NoFragmentCycles';
 
 // Spec Section: "All Variable Used Defined"
-export {
-  NoUndefinedVariables as NoUndefinedVariablesRule,
-} from './rules/NoUndefinedVariables';
+export { NoUndefinedVariables as NoUndefinedVariablesRule } from './rules/NoUndefinedVariables';
 
 // Spec Section: "Fragments must be used"
-export {
-  NoUnusedFragments as NoUnusedFragmentsRule,
-} from './rules/NoUnusedFragments';
+export { NoUnusedFragments as NoUnusedFragmentsRule } from './rules/NoUnusedFragments';
 
 // Spec Section: "All Variables Used"
-export {
-  NoUnusedVariables as NoUnusedVariablesRule,
-} from './rules/NoUnusedVariables';
+export { NoUnusedVariables as NoUnusedVariablesRule } from './rules/NoUnusedVariables';
 
 // Spec Section: "Field Selection Merging"
-export {
-  OverlappingFieldsCanBeMerged as OverlappingFieldsCanBeMergedRule,
-} from './rules/OverlappingFieldsCanBeMerged';
+export { OverlappingFieldsCanBeMerged as OverlappingFieldsCanBeMergedRule } from './rules/OverlappingFieldsCanBeMerged';
 
 // Spec Section: "Fragment spread is possible"
-export {
-  PossibleFragmentSpreads as PossibleFragmentSpreadsRule,
-} from './rules/PossibleFragmentSpreads';
+export { PossibleFragmentSpreads as PossibleFragmentSpreadsRule } from './rules/PossibleFragmentSpreads';
 
 // Spec Section: "Argument Optionality"
-export {
-  ProvidedRequiredArguments as ProvidedRequiredArgumentsRule,
-} from './rules/ProvidedRequiredArguments';
+export { ProvidedRequiredArguments as ProvidedRequiredArgumentsRule } from './rules/ProvidedRequiredArguments';
 
 // Spec Section: "Leaf Field Selections"
 export { ScalarLeafs as ScalarLeafsRule } from './rules/ScalarLeafs';
 
 // Spec Section: "Subscriptions with Single Root Field"
-export {
-  SingleFieldSubscriptions as SingleFieldSubscriptionsRule,
-} from './rules/SingleFieldSubscriptions';
+export { SingleFieldSubscriptions as SingleFieldSubscriptionsRule } from './rules/SingleFieldSubscriptions';
 
 // Spec Section: "Argument Uniqueness"
-export {
-  UniqueArgumentNames as UniqueArgumentNamesRule,
-} from './rules/UniqueArgumentNames';
+export { UniqueArgumentNames as UniqueArgumentNamesRule } from './rules/UniqueArgumentNames';
 
 // Spec Section: "Directives Are Unique Per Location"
-export {
-  UniqueDirectivesPerLocation as UniqueDirectivesPerLocationRule,
-} from './rules/UniqueDirectivesPerLocation';
+export { UniqueDirectivesPerLocation as UniqueDirectivesPerLocationRule } from './rules/UniqueDirectivesPerLocation';
 
 // Spec Section: "Fragment Name Uniqueness"
-export {
-  UniqueFragmentNames as UniqueFragmentNamesRule,
-} from './rules/UniqueFragmentNames';
+export { UniqueFragmentNames as UniqueFragmentNamesRule } from './rules/UniqueFragmentNames';
 
 // Spec Section: "Input Object Field Uniqueness"
-export {
-  UniqueInputFieldNames as UniqueInputFieldNamesRule,
-} from './rules/UniqueInputFieldNames';
+export { UniqueInputFieldNames as UniqueInputFieldNamesRule } from './rules/UniqueInputFieldNames';
 
 // Spec Section: "Operation Name Uniqueness"
-export {
-  UniqueOperationNames as UniqueOperationNamesRule,
-} from './rules/UniqueOperationNames';
+export { UniqueOperationNames as UniqueOperationNamesRule } from './rules/UniqueOperationNames';
 
 // Spec Section: "Variable Uniqueness"
-export {
-  UniqueVariableNames as UniqueVariableNamesRule,
-} from './rules/UniqueVariableNames';
+export { UniqueVariableNames as UniqueVariableNamesRule } from './rules/UniqueVariableNames';
 
 // Spec Section: "Values Type Correctness"
-export {
-  ValuesOfCorrectType as ValuesOfCorrectTypeRule,
-} from './rules/ValuesOfCorrectType';
+export { ValuesOfCorrectType as ValuesOfCorrectTypeRule } from './rules/ValuesOfCorrectType';
 
 // Spec Section: "Variables are Input Types"
-export {
-  VariablesAreInputTypes as VariablesAreInputTypesRule,
-} from './rules/VariablesAreInputTypes';
+export { VariablesAreInputTypes as VariablesAreInputTypesRule } from './rules/VariablesAreInputTypes';
 
 // Spec Section: "All Variable Usages Are Allowed"
-export {
-  VariablesInAllowedPosition as VariablesInAllowedPositionRule,
-} from './rules/VariablesInAllowedPosition';
+export { VariablesInAllowedPosition as VariablesInAllowedPositionRule } from './rules/VariablesInAllowedPosition';
diff --git a/yarn.lock b/yarn.lock
index 54e2fe20e5..1ccc84410d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2457,10 +2457,10 @@ prelude-ls@~1.1.2:
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
   integrity sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=
 
-prettier@1.18.2:
-  version "1.18.2"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.18.2.tgz#6823e7c5900017b4bd3acf46fe9ac4b4d7bda9ea"
-  integrity sha512-OeHeMc0JhFE9idD4ZdtNibzY0+TPHSpSSb9h8FqtP+YnoZZ1sl8Vc9b1sasjfymH3SonAF4QcA2+mzHPhMvIiw==
+prettier@1.19.1:
+  version "1.19.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
+  integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
 
 private@^0.1.6:
   version "0.1.8"