enable some new linting rules

Author: zloirock

scripts/build-compat/entries.mjs

@@ -17,7 +17,7 @@ async function getModulesForEntryPoint(path, parent) {
     return getModulesForEntryPoint(dependency, entry);
   }));
 
-  return helpers.intersection(result.flat(1), modules);
+  return helpers.intersection(result.flat(), modules);
 }
 
 const entriesList = await glob([

tests/eslint/eslint.config.js

@@ -613,9 +613,13 @@ const base = {
   'unicorn/no-thenable': ERROR,
   // disallow comparing `undefined` using `typeof` when it's not required
   'unicorn/no-typeof-undefined': ERROR,
+  // disallow using 1 as the depth argument of `Array#flat()`
+  'unicorn/no-unnecessary-array-flat-depth': ERROR,
+  // disallow using `.length` or `Infinity` as the `deleteCount` or `skipCount` argument of `Array#{ splice, toSpliced }()`
+  'unicorn/no-unnecessary-array-splice-count': ERROR,
   // disallow awaiting non-promise values
   'unicorn/no-unnecessary-await': ERROR,
-  // disallow using `.length` or `Infinity` as the `deleteCount` or `skipCount` argument of `Array#{splice,toSpliced}()
+  // disallow using `.length` or `Infinity` as the end argument of `{ Array, String, %TypedArray% }#slice()`
   'unicorn/no-unnecessary-slice-end': ERROR,
   // disallow unreadable array destructuring
   'unicorn/no-unreadable-array-destructuring': ERROR,
@@ -1971,6 +1975,8 @@ const packagesPackageJSON = {
   'package-json/repository-shorthand': [ERROR, { form: 'object' }],
   // requires the `author` property to be present
   'package-json/require-author': ERROR,
+  // requires the `description` property to be present
+  'package-json/require-description': ERROR,
   // requires the `engines` property to be present
   // TODO: core-js@4
   // 'package-json/require-engines': ERROR,

tests/unit-global/es.array.flat.js

@@ -11,6 +11,7 @@ QUnit.test('Array#flat', assert => {
   assert.deepEqual([].flat(), []);
   const array = [1, [2, 3], [4, [5, 6]]];
   assert.deepEqual(array.flat(0), array);
+  // eslint-disable-next-line unicorn/no-unnecessary-array-flat-depth -- testing
   assert.deepEqual(array.flat(1), [1, 2, 3, 4, [5, 6]]);
   assert.deepEqual(array.flat(), [1, 2, 3, 4, [5, 6]]);
   assert.deepEqual(array.flat(2), [1, 2, 3, 4, 5, 6]);