MetaProperty is possibly nullish (microsoft#60440)

Author: RyanCavanaugh

src/compiler/checker.ts

@@ -39784,6 +39784,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
             case SyntaxKind.AwaitExpression:
             case SyntaxKind.CallExpression:
             case SyntaxKind.ElementAccessExpression:
+            case SyntaxKind.MetaProperty:
             case SyntaxKind.NewExpression:
             case SyntaxKind.PropertyAccessExpression:
             case SyntaxKind.YieldExpression:

tests/baselines/reference/predicateSemantics.errors.txt

@@ -96,4 +96,11 @@ predicateSemantics.ts(52,14): error TS2869: Right operand of ?? is unreachable b
                  ~~~~~~~~~~
 !!! error TS2869: Right operand of ?? is unreachable because the left operand is never nullish.
     }
+    
+    // https://github.com/microsoft/TypeScript/issues/60439
+    class X {
+      constructor() {
+        const p = new.target ?? 32;
+      }
+    }
 

tests/baselines/reference/predicateSemantics.js

@@ -54,6 +54,13 @@ function foo(this: Object | undefined) {
   const e = (i++, i++) ?? true; // error
   const f = (maybe, i++) ?? true; // error
 }
+
+// https://github.com/microsoft/TypeScript/issues/60439
+class X {
+  constructor() {
+    const p = new.target ?? 32;
+  }
+}
 
 
 //// [predicateSemantics.js]
@@ -106,3 +113,12 @@ function foo() {
     var e = (_h = (i++, i++)) !== null && _h !== void 0 ? _h : true; // error
     var f = (_j = (maybe, i++)) !== null && _j !== void 0 ? _j : true; // error
 }
+// https://github.com/microsoft/TypeScript/issues/60439
+var X = /** @class */ (function () {
+    function X() {
+        var _newTarget = this.constructor;
+        var _a;
+        var p = (_a = _newTarget) !== null && _a !== void 0 ? _a : 32;
+    }
+    return X;
+}());

tests/baselines/reference/predicateSemantics.symbols

@@ -104,3 +104,15 @@ function foo(this: Object | undefined) {
 >i : Symbol(i, Decl(predicateSemantics.ts, 48, 5))
 }
 
+// https://github.com/microsoft/TypeScript/issues/60439
+class X {
+>X : Symbol(X, Decl(predicateSemantics.ts, 52, 1))
+
+  constructor() {
+    const p = new.target ?? 32;
+>p : Symbol(p, Decl(predicateSemantics.ts, 57, 9))
+>new.target : Symbol(X, Decl(predicateSemantics.ts, 52, 1))
+>target : Symbol(X, Decl(predicateSemantics.ts, 52, 1))
+  }
+}
+

tests/baselines/reference/predicateSemantics.types

@@ -308,3 +308,23 @@ function foo(this: Object | undefined) {
 >     : ^^^^
 }
 
+// https://github.com/microsoft/TypeScript/issues/60439
+class X {
+>X : X
+>  : ^
+
+  constructor() {
+    const p = new.target ?? 32;
+>p : 32 | typeof X
+>  : ^^^^^^^^^^^^^
+>new.target ?? 32 : 32 | typeof X
+>                 : ^^^^^^^^^^^^^
+>new.target : typeof X
+>           : ^^^^^^^^
+>target : typeof X
+>       : ^^^^^^^^
+>32 : 32
+>   : ^^
+  }
+}
+

tests/cases/compiler/predicateSemantics.ts

@@ -51,3 +51,10 @@ function foo(this: Object | undefined) {
   const e = (i++, i++) ?? true; // error
   const f = (maybe, i++) ?? true; // error
 }
+
+// https://github.com/microsoft/TypeScript/issues/60439
+class X {
+  constructor() {
+    const p = new.target ?? 32;
+  }
+}