feat: add option to retain node protocol

src/esbuild/index.ts

@@ -119,7 +119,7 @@ export async function runEsbuild(
 
   await pluginContainer.buildStarted()
   const esbuildPlugins: Array<EsbuildPlugin | false | undefined> = [
-    format === 'cjs' && nodeProtocolPlugin(),
+    format === 'cjs' && options.removeNodeProtocol && nodeProtocolPlugin(),
     {
       name: 'modify-options',
       setup(build) {

src/index.ts

@@ -79,6 +79,7 @@ const normalizeOptions = async (
 
   const options: Partial<NormalizedOptions> = {
     outDir: 'dist',
+    removeNodeProtocol: true,
     ..._options,
     format:
       typeof _options.format === 'string'

src/options.ts

@@ -240,6 +240,14 @@ export type Options = {
    * @default false
    */
   cjsInterop?: boolean
+
+  /**
+   * Remove `node:` protocol from imports
+   *
+   * The default value will be flipped to `false` in the next major release
+   * @default true
+   */
+  removeNodeProtocol?: boolean
 }
 
 export interface NormalizedExperimentalDtsConfig {

test/__snapshots__/index.test.ts.snap

@@ -26,6 +26,37 @@ module.exports = 123;
 "
 `;
 
+exports[`don't remove node protocol 1`] = `
+""use strict";
+var __create = Object.create;
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __getProtoOf = Object.getPrototypeOf;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toESM = (mod, isNodeMode, target) => (target = mod != null ? __create(__getProtoOf(mod)) : {}, __copyProps(
+  // If the importer is in node compatibility mode or this is not an ESM
+  // file that has been converted to a CommonJS file using a Babel-
+  // compatible transform (i.e. "__esModule" has not been set), then set
+  // "default" to the CommonJS "module.exports" for node compatibility.
+  isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target,
+  mod
+));
+
+// input.ts
+var import_node_fs = __toESM(require("node:fs"));
+console.log(import_node_fs.default);
+"
+`;
+
 exports[`external 1`] = `
 ""use strict";
 var __defProp = Object.defineProperty;

test/index.test.ts

@@ -115,6 +115,19 @@ test('node protocol', async () => {
     'input.ts': `import fs from 'node:fs'; console.log(fs)`,
   })
   expect(output).toMatchSnapshot()
+  expect(output).not.contain('node:fs')
+})
+
+test("don't remove node protocol", async () => {
+  const { output } = await run(getTestName(), {
+    'input.ts': `import fs from 'node:fs'; console.log(fs)`,
+    'tsup.config.ts': `
+    export default {
+      removeNodeProtocol: false,
+    }`,
+  })
+  expect(output).toMatchSnapshot()
+  expect(output).contain('node:fs')
 })
 
 test('external', async () => {