From e12b004dcc5848d5ae0638e885147c54e11cc72b Mon Sep 17 00:00:00 2001
From: Ahn <anhpnnd@gmail.com>
Date: Tue, 9 Feb 2021 10:40:05 +0100
Subject: [PATCH] feat(presets): add typing for `presets` entry point (#2341)

---
 .eslintignore                     | 1 +
 presets/index.d.ts                | 8 ++++++++
 src/cli/helpers/presets.ts        | 2 +-
 src/presets/create-jest-preset.ts | 3 +--
 src/types.ts                      | 2 ++
 5 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 presets/index.d.ts

diff --git a/.eslintignore b/.eslintignore
index 2b56278eaa..5a69593f48 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -5,5 +5,6 @@ e2e/__workdir_synlink__/
 e2e/__external-repos__/
 coverage/
 docs/
+presets/index.d.ts
 *.config.js
 .eslintrc.js
diff --git a/presets/index.d.ts b/presets/index.d.ts
new file mode 100644
index 0000000000..5c985d0dbc
--- /dev/null
+++ b/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;
diff --git a/src/cli/helpers/presets.ts b/src/cli/helpers/presets.ts
index 00490a5ff1..3055b37790 100644
--- a/src/cli/helpers/presets.ts
+++ b/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 {
diff --git a/src/presets/create-jest-preset.ts b/src/presets/create-jest-preset.ts
index 0b48c79eac..44d309c808 100644
--- a/src/presets/create-jest-preset.ts
+++ b/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
 }
diff --git a/src/types.ts b/src/types.ts
index dab618cc4e..b0b8dd111a 100644
--- a/src/types.ts
+++ b/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