feat(preset): adds presets typings and export all presets

All presets are now accessible with typings by importing
`ts-jest/presets`

presets/default/jest-preset.js

@@ -1,3 +1 @@
-const create = require('../create')
-
-module.exports = create()
+module.exports = require('..').defaults

presets/index.d.ts

@@ -0,0 +1,5 @@
+import { TsJestPresets } from '../dist/types'
+
+export const defaults: TsJesPresets
+export const jsWithTs: TsJesPresets
+export const jsWithBabel: TsJesPresets

presets/index.js

@@ -0,0 +1,13 @@
+const create = './create'
+
+module.exports = {
+  get defaults() { return create() },
+  get jsWithTs() { return create({ allowJs: true }) },
+  get jsWithBabel() {
+    return create({ allowJs: false }, {
+      transform: {
+        '^.+\\.jsx?$': 'babel-jest',
+      },
+    })
+  },
+}

presets/js-with-babel/jest-preset.js

@@ -1,7 +1 @@
-const create = require('../create')
-
-module.exports = create({ allowJs: false }, {
-  transform: {
-    '^.+\\.jsx?$': 'babel-jest',
-  },
-})
+module.exports = require('..').jsWithBabel

presets/js-with-ts/jest-preset.js

@@ -1,3 +1 @@
-const create = require('../create')
-
-module.exports = create({allowJs: true})
+module.exports = require('..').jsWithTs

src/config/create-jest-preset.ts

@@ -1,6 +1,6 @@
 import * as jestConfig from 'jest-config'
 
-import { CreateJestPresetOptions } from '../types'
+import { CreateJestPresetOptions, TsJestPresets } from '../types'
 import { rootLogger } from '../util/logger'
 
 const logger = rootLogger.child({ namespace: 'jest-preset' })
@@ -12,7 +12,10 @@ const defaults = jestConfig.defaults || {
   moduleFileExtensions: ['js', 'json', 'jsx', 'node'],
 }
 
-export function createJestPreset({ allowJs = false }: CreateJestPresetOptions = {}, from?: jest.InitialOptions) {
+export function createJestPreset(
+  { allowJs = false }: CreateJestPresetOptions = {},
+  from?: jest.InitialOptions,
+): TsJestPresets {
   logger.debug({ allowJs }, 'creating jest presets', allowJs ? 'handling' : 'not handling', 'JavaScript files')
   from = { ...defaults, ...from }
   return {

src/types.ts

@@ -69,6 +69,12 @@ export interface TsJestGlobalOptions {
   stringifyContentPathRegex?: string | RegExp
 }
 
+export interface TsJestPresets {
+  transform: Record<string, string>
+  testMatch: string[]
+  moduleFileExtensions: string[]
+}
+
 interface TsJestConfig$tsConfig$file {
   kind: 'file'
   value: string | undefined