[ci] Remove jestSequencer

This was previously used for circleci parallelization but is no longer
needed.

ghstack-source-id: d8c1005e09
Pull Request resolved: https://github.com/facebook/react/pull/30500

scripts/jest/config.base.js

@@ -24,8 +24,6 @@ module.exports = {
   },
   snapshotSerializers: [require.resolve('jest-snapshot-serializer-raw')],
 
-  testSequencer: require.resolve('./jestSequencer'),
-
   testEnvironment: 'jsdom',
 
   testRunner: 'jest-circus/runner',

scripts/jest/jestSequencer.js

@@ -1,19 +0,0 @@
-'use strict';
-
-const Sequencer = require('@jest/test-sequencer').default;
-
-class CustomSequencer extends Sequencer {
-  sort(tests) {
-    if (process.env.CIRCLE_NODE_TOTAL) {
-      // In CI, parallelize tests across multiple tasks.
-      const nodeTotal = parseInt(process.env.CIRCLE_NODE_TOTAL, 10);
-      const nodeIndex = parseInt(process.env.CIRCLE_NODE_INDEX, 10);
-      tests = tests
-        .sort((a, b) => (a.path < b.path ? -1 : 1))
-        .filter((_, i) => i % nodeTotal === nodeIndex);
-    }
-    return tests;
-  }
-}
-
-module.exports = CustomSequencer;