feat(presets): add typing for presets entry point (#2341)

.eslintignore

@@ -5,5 +5,6 @@ e2e/__workdir_synlink__/
 e2e/__external-repos__/
 coverage/
 docs/
+presets/index.d.ts
 *.config.js
 .eslintrc.js

presets/index.d.ts

@@ -0,0 +1,8 @@
+import type { TsJestPresets } from '../dist/types'
+
+declare const _default: {
+  defaults: TsJestPresets;
+  jsWithTs: TsJestPresets;
+  jsWithBabel: TsJestPresets;
+};
+export = _default;

src/cli/helpers/presets.ts

@@ -1,4 +1,4 @@
-import type { TsJestPresets } from '../../presets/create-jest-preset'
+import type { TsJestPresets } from '../../types'
 
 /** @internal */
 export const enum JestPresetNames {

src/presets/create-jest-preset.ts

@@ -1,11 +1,10 @@
 import type { Config } from '@jest/types'
 
+import type { TsJestPresets } from '../types'
 import { rootLogger } from '../utils/logger'
 
 const logger = rootLogger.child({ namespace: 'jest-preset' })
 
-export type TsJestPresets = Pick<Config.InitialOptions, 'moduleFileExtensions' | 'transform' | 'testMatch'>
-
 interface CreateJestPresetOptions {
   allowJs?: boolean
 }

src/types.ts

@@ -162,6 +162,8 @@ export interface InitialOptionsTsJest extends Config.InitialOptions {
   globals?: GlobalConfigTsJest
 }
 
+export type TsJestPresets = Pick<Config.InitialOptions, 'moduleFileExtensions' | 'transform' | 'testMatch'>
+
 interface TsJestConfig$tsConfig$file {
   kind: 'file'
   value: string | undefined