⏪ Revert Jest 27 utils re-export (will need to be a breaking change)

package.json

@@ -52,8 +52,7 @@
     "@commitlint/cli": "^13.1.0",
     "@commitlint/config-conventional": "^13.1.0",
     "@commitlint/prompt": "^13.1.0",
-    "@jest/globals": "^27.4.6",
-    "@types/jest": "^27.4.0",
+    "@types/jest": "^27.0.2",
     "@typescript-eslint/eslint-plugin": "^5.10.0",
     "@typescript-eslint/parser": "^5.4.0",
     "arrify": "^2.0.1",
@@ -75,7 +74,7 @@
     "eslint-plugin-react-hooks": "^4.3.0",
     "glob": "^7.2.0",
     "is-ci": "^3.0.0",
-    "jest": "^27.4.7",
+    "jest": "^27.3.1",
     "jest-github-actions-reporter": "^1.0.3",
     "jest-watch-typeahead": "^1.0.0",
     "lint-staged": "^11.1.2",
@@ -125,6 +124,7 @@
     "@babel/core": "^7.16.0",
     "@babel/preset-env": "^7.16.11",
     "@types/cross-spawn": "^6.0.2",
+    "babel-jest": "^27.2.4",
     "eslint-config-kentcdodds": "^20.0.1",
     "husky": "^7.0.4",
     "jest-in-case": "^1.0.2",

src/api/__tests__/test.js

@@ -1,14 +1,11 @@
-import * as utilsExports from 'ts-jest'
+import * as utilsExports from 'ts-jest/utils'
 import * as testExports from '../test' // eslint-disable-line import/namespace
 
-const toForwardTsJest = ['pathsToModuleNameMapper', 'createJestPreset']
-
 describe('re-exporting ts-jest utils', () => {
-  test.each(
-    Object.entries(utilsExports).filter(([key]) =>
-      toForwardTsJest.includes(key),
-    ),
-  )('forwards `%s` export', (exportName, exportValue) => {
-    expect(testExports).toHaveProperty(exportName, exportValue)
-  })
+  test.each(Object.entries(utilsExports).filter(([key]) => key !== 'default'))(
+    'forwards `%s` export',
+    (exportName, exportValue) => {
+      expect(testExports).toHaveProperty(exportName, exportValue)
+    },
+  )
 })

src/api/test.js

@@ -1,6 +1 @@
-import {jest} from '@jest/globals'
-export {pathsToModuleNameMapper, createJestPreset} from 'ts-jest'
-
-const {mocked} = jest
-
-export {mocked}
+export * from 'ts-jest/utils'

src/config/jest.config.js

@@ -2,7 +2,7 @@
 
 const {jsWithTs: preset} = require('ts-jest/presets')
 
-const {ifAnyDep, hasFile, fromRoot} = require('../utils')
+const {ifAnyDep, hasAnyDep, hasFile, fromRoot} = require('../utils')
 
 const {
   testMatch,
@@ -29,14 +29,6 @@ const jestConfig = {
   testMatch,
   testPathIgnorePatterns: [...ignores, '<rootDir>/dist'],
   testLocationInResults: true,
-  transform: Object.fromEntries(
-    // Ensure we can resolve the preset even when
-    // it's in a nested `node_modules` installation
-    Object.entries(preset.transform).map(([key, value]) => [
-      key,
-      require.resolve(value),
-    ]),
-  ),
   coveragePathIgnorePatterns: [
     ...ignores,
     'src/(umd|cjs|esm)-entry.js$',
@@ -59,13 +51,24 @@ const jestConfig = {
     require.resolve('jest-watch-typeahead/filename'),
     require.resolve('jest-watch-typeahead/testname'),
   ],
-  globals: {
-    'ts-jest': {
-      diagnostics: {
-        warnOnly: true,
-      },
+  globals: {},
+}
+
+if (hasAnyDep('ts-jest') || hasFile('tsconfig.json')) {
+  jestConfig.transform = Object.fromEntries(
+    // Ensure we can resolve the preset even when
+    // it's in a nested `node_modules` installation
+    Object.entries(preset.transform).map(([key, value]) => [
+      key,
+      require.resolve(value),
+    ]),
+  )
+
+  jestConfig.globals['ts-jest'] = {
+    diagnostics: {
+      warnOnly: true,
     },
-  },
+  }
 }
 
 if (hasFile('tests/setup-env.js')) {

src/tsconfig.json

@@ -5,10 +5,9 @@
   "compilerOptions": {
     "allowJs": true,
     "checkJs": true,
-    "declarationMap": true,
     "emitDeclarationOnly": true,
+    "declarationMap": true,
     "outDir": "../dist",
-    "rootDir": ".",
-    "skipLibCheck": true
+    "rootDir": "."
   }
 }