feat: esm & cjs loaders (#320)

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-    timeout-minutes: 10
+    timeout-minutes: 15
 
     steps:
     - name: Checkout

README.md

@@ -153,22 +153,33 @@ tsx --no-cache ./file.ts
 
 `tsx` is a standalone binary designed to be used in place of `node`, but sometimes you'll want to use `node` directly. For example, when adding TypeScript & ESM support to npm-installed binaries.
 
-To use `tsx` as a  Node.js loader, simply pass it in to the [`--loader`](https://nodejs.org/api/esm.html#loaders) flag.
-
-> Note: The loader is limited to adding support for loading TypeScript/ESM files. CLI features such as _watch mode_ or suppressing "experimental feature" warnings will not be available.
+To use `tsx` as a  Node.js loader, pass it in to the [`--loader`](https://nodejs.org/api/esm.html#loaders) flag. This will add TypeScript & ESM support for both ESM and CommonJS contexts.
 
 ```sh
-# As a CLI flag
 node --loader tsx ./file.ts
+```
 
-# As an environment variable
+Or as an environment variable:
+```sh
 NODE_OPTIONS='--loader tsx' node ./file.ts
 ```
 
-> Tip: In rare circumstances, you might be limited to using the [`-r, --require`](https://nodejs.org/api/cli.html#-r---require-module) flag.
->
-> You can use [`@esbuild-kit/cjs-loader`](https://github.com/esbuild-kit/cjs-loader), but transformations will only be applied to `require()` (not `import`).
+> **Note:** The loader is limited to adding support for loading TypeScript/ESM files. CLI features such as _watch mode_ or suppressing "experimental feature" warnings will not be available.
 
+#### ESM only loader
+
+If you only need to add TypeScript support in a Module context, you can use the ESM loader:
+
+```sh
+node --loader tsx/esm ./file.ts
+```
+
+#### CommonJS only loader
+If you only need to add TypeScript & ESM support in a CommonJS context, you can use the CJS loader:
+
+```sh
+node --require tsx/cjs ./file.ts
+```
 
 ### Hashbang
 
@@ -194,14 +205,6 @@ $ ./file.ts hello
 argv: [ 'hello' ]
 ```
 
-## Dependencies
-
-#### [@esbuild-kit/esm-loader](https://github.com/esbuild-kit/esm-loader)
-Node.js Loader to transform TypeScript to ESM.
-
-#### [@esbuild-kit/cjs-loader](https://github.com/esbuild-kit/cjs-loader)
-Node.js `require()` hook to transform TypeScript & ESM to CommonJS.
-
 <br>
 
 <p align="center">

package.json

@@ -23,19 +23,22 @@
 	],
 	"exports": {
 		"./package.json": "./package.json",
-		".": "./dist/loader.js",
-		"./cli": "./dist/cli.js",
+		".": "./dist/loader.mjs",
+		"./cjs": "./dist/cjs/index.cjs",
+		"./esm": "./dist/esm/index.mjs",
+		"./cli": "./dist/cli.mjs",
+		"./source-map": "./dist/source-map.cjs",
 		"./suppress-warnings": "./dist/suppress-warnings.cjs",
 		"./preflight": "./dist/preflight.cjs",
-		"./repl": "./dist/repl.js"
+		"./repl": "./dist/repl.mjs"
 	},
-	"bin": "./dist/cli.js",
+	"bin": "./dist/cli.mjs",
 	"scripts": {
 		"prepare": "pnpm simple-git-hooks",
 		"build": "pkgroll --target=node12.19 --minify",
 		"lint": "eslint --cache .",
 		"type-check": "tsc --noEmit",
-		"test": "pnpm build && node ./dist/cli.js tests/index.ts",
+		"test": "pnpm build && node ./dist/cli.mjs tests/index.ts",
 		"prepack": "pnpm build && clean-pkg-json"
 	},
 	"simple-git-hooks": {
@@ -45,37 +48,42 @@
 		"*.{js,ts,mjs,mts,cjs,cts,json}": "pnpm lint"
 	},
 	"dependencies": {
-		"@esbuild-kit/cjs-loader": "^2.4.4",
-		"@esbuild-kit/core-utils": "^3.3.2",
-		"@esbuild-kit/esm-loader": "^2.6.5"
+		"esbuild": "~0.18.20",
+		"get-tsconfig": "^4.7.2",
+		"source-map-support": "^0.5.21"
 	},
 	"optionalDependencies": {
 		"fsevents": "~2.3.3"
 	},
 	"devDependencies": {
+		"@ampproject/remapping": "^2.2.1",
 		"@pvtnbr/eslint-config": "^0.37.0",
 		"@types/cross-spawn": "^6.0.3",
 		"@types/node": "^20.6.0",
 		"@types/react": "^18.2.21",
 		"@types/semver": "^7.5.1",
+		"@types/source-map-support": "^0.5.7",
 		"cachedir": "^2.4.0",
 		"chokidar": "^3.5.3",
 		"clean-pkg-json": "^1.2.0",
 		"cleye": "^1.3.2",
 		"cross-spawn": "^7.0.3",
+		"es-module-lexer": "^1.3.1",
 		"eslint": "^8.49.0",
 		"execa": "^8.0.1",
 		"fs-fixture": "^1.2.0",
 		"get-node": "^14.2.1",
 		"kolorist": "^1.8.0",
 		"lint-staged": "^14.0.1",
+		"magic-string": "^0.30.3",
 		"manten": "^1.1.0",
 		"node-pty": "^1.0.0",
 		"outdent": "^0.8.0",
-		"pkgroll": "^1.11.0",
+		"pkgroll": "^1.11.1",
 		"semver": "^7.5.4",
 		"simple-git-hooks": "^2.9.0",
 		"strip-ansi": "^7.1.0",
+		"type-fest": "^4.3.1",
 		"type-flag": "^3.0.0",
 		"typescript": "^5.2.2"
 	},