Add esbuild resolver for jest.config.ts

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### Features
 
+- `[jest-config]` Add esbuild resolver for `jest.config.ts` as a `ts-node` alternative ([#12041](https://github.com/facebook/jest/pull/12041))
 - `[jest-core]` Add support for `testResultsProcessor` written in ESM ([#12006](https://github.com/facebook/jest/pull/12006))
 - `[jest-diff, pretty-format]` Add `compareKeys` option for custom sorting of object keys ([#11992](https://github.com/facebook/jest/pull/11992))
 

package.json

@@ -5,8 +5,6 @@
   "devDependencies": {
     "@babel/core": "^7.3.4",
     "@babel/plugin-proposal-class-properties": "^7.3.4",
-    "@babel/plugin-transform-modules-commonjs": "^7.1.0",
-    "@babel/preset-env": "^7.1.0",
     "@babel/preset-react": "^7.0.0",
     "@babel/preset-typescript": "^7.0.0",
     "@babel/register": "^7.0.0",
@@ -31,6 +29,7 @@
     "codecov": "^3.0.0",
     "debug": "^4.0.1",
     "dedent": "^0.7.0",
+    "esbuild-register": "^3.1.0",
     "eslint": "^7.7.0",
     "eslint-config-prettier": "^8.1.0",
     "eslint-plugin-eslint-comments": "^3.1.2",

packages/jest-config/package.json

@@ -14,9 +14,13 @@
     "./package.json": "./package.json"
   },
   "peerDependencies": {
+    "esbuild-register": ">=3.1.0",
     "ts-node": ">=9.0.0"
   },
   "peerDependenciesMeta": {
+    "esbuild-register": {
+      "optional": true
+    },
     "ts-node": {
       "optional": true
     }

packages/jest-config/src/readConfigFileAndSetRootDir.ts

@@ -6,6 +6,7 @@
  */
 
 import * as path from 'path';
+import type {Register} from 'esbuild-register/dist/node';
 import * as fs from 'graceful-fs';
 import type {Service} from 'ts-node';
 import type {Config} from '@jest/types';
@@ -83,26 +84,37 @@ export default async function readConfigFileAndSetRootDir(
 const loadTSConfigFile = async (
   configPath: Config.Path,
 ): Promise<Config.InitialOptions> => {
-  let registerer: Service;
+  let tsNode: Service | undefined;
+  let esbuild: Register | undefined;
 
   // Register TypeScript compiler instance
   try {
-    registerer = require('ts-node').register({
+    tsNode = require('ts-node').register({
       compilerOptions: {
         module: 'CommonJS',
       },
     });
   } catch (e: any) {
     if (e.code === 'MODULE_NOT_FOUND') {
-      throw new Error(
-        `Jest: 'ts-node' is required for the TypeScript configuration files. Make sure it is installed\nError: ${e.message}`,
-      );
+      try {
+        esbuild = require('esbuild-register').register({
+          target: `node${process.version.slice(1)}`,
+        });
+      } catch (error: any) {
+        if (error.code === 'MODULE_NOT_FOUND') {
+          throw new Error(
+            `Jest: 'ts-node' or 'esbuild' is required for the TypeScript configuration files. Make sure it is installed\nError: ${e.message}`,
+          );
+        }
+
+        throw error;
+      }
     }
 
     throw e;
   }
 
-  registerer.enabled(true);
+  tsNode?.enabled(true);
 
   let configObject = interopRequireDefault(require(configPath)).default;
 
@@ -111,7 +123,8 @@ const loadTSConfigFile = async (
     configObject = await configObject();
   }
 
-  registerer.enabled(false);
+  tsNode?.enabled(false);
+  esbuild?.unregister();
 
   return configObject;
 };

yarn.lock

@@ -1619,7 +1619,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/preset-env@npm:*, @babel/preset-env@npm:^7.1.0, @babel/preset-env@npm:^7.11.0, @babel/preset-env@npm:^7.12.1, @babel/preset-env@npm:^7.12.16":
+"@babel/preset-env@npm:*, @babel/preset-env@npm:^7.11.0, @babel/preset-env@npm:^7.12.1, @babel/preset-env@npm:^7.12.16":
   version: 7.15.6
   resolution: "@babel/preset-env@npm:7.15.6"
   dependencies:
@@ -2556,8 +2556,6 @@ __metadata:
   dependencies:
     "@babel/core": ^7.3.4
     "@babel/plugin-proposal-class-properties": ^7.3.4
-    "@babel/plugin-transform-modules-commonjs": ^7.1.0
-    "@babel/preset-env": ^7.1.0
     "@babel/preset-react": ^7.0.0
     "@babel/preset-typescript": ^7.0.0
     "@babel/register": ^7.0.0
@@ -2582,6 +2580,7 @@ __metadata:
     codecov: ^3.0.0
     debug: ^4.0.1
     dedent: ^0.7.0
+    esbuild-register: ^3.1.0
     eslint: ^7.7.0
     eslint-config-prettier: ^8.1.0
     eslint-plugin-eslint-comments: ^3.1.2
@@ -9113,6 +9112,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"esbuild-register@npm:^3.1.0":
+  version: 3.1.0
+  resolution: "esbuild-register@npm:3.1.0"
+  dependencies:
+    jsonc-parser: ^3.0.0
+  peerDependencies:
+    esbuild: ">=0.12 <1"
+  checksum: 6177ce57f7599bf2f83684611b445e002766183d804eee01f3a33f776bbd2e97e24083e090ee638a39f9711ab44cd9f3587db458ea090d7d801de7c3bd027701
+  languageName: node
+  linkType: hard
+
 "escalade@npm:^3.0.2, escalade@npm:^3.1.1":
   version: 3.1.1
   resolution: "escalade@npm:3.1.1"
@@ -12662,8 +12672,11 @@ fsevents@^1.2.7:
     ts-node: ^9.0.0
     typescript: ^4.0.3
   peerDependencies:
+    esbuild-register: ">=3.1.0"
     ts-node: ">=9.0.0"
   peerDependenciesMeta:
+    esbuild-register:
+      optional: true
     ts-node:
       optional: true
   languageName: unknown
@@ -13602,6 +13615,13 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"jsonc-parser@npm:^3.0.0":
+  version: 3.0.0
+  resolution: "jsonc-parser@npm:3.0.0"
+  checksum: 36b9080a7e25f5052c7d551109c4ead564f3102d7ca0c5ee4a2f7debc18b2cd31896e0e369cfd1442d9d2d71fc1defaf094ba885bc9b43a6a3f2b3a9083fd2cb
+  languageName: node
+  linkType: hard
+
 "jsonfile@npm:^2.1.0":
   version: 2.4.0
   resolution: "jsonfile@npm:2.4.0"