fix: support cjs stubbing (#220)

Author: danielroe

src/core/package/index.spec.ts

@@ -59,24 +59,33 @@ describe('package class', () => {
   // TODO: move to fixture
   test('should generate package stub', async () => {
     const defaultPath = getFixturePath('default')
-    const files = [
-      resolve(defaultPath, 'dist/index.js'),
-      resolve(defaultPath, 'dist/index.es.js'),
-      resolve(defaultPath, 'dist/index.d.ts'),
-    ]
-    for (const file of files) {
+    const files = {
+      [resolve(defaultPath, 'dist/index.js')]: [
+        `const jiti = require('jiti')()`,
+        `module.exports = jiti('./../src/index')`,
+      ].join('\n'),
+      [resolve(
+        defaultPath,
+        'dist/index.es.js'
+      )]: `export * from './../src/index'`,
+      [resolve(
+        defaultPath,
+        'dist/index.d.ts'
+      )]: `export * from './../src/index'`,
+    }
+    for (const file in files) {
       await remove(file)
       expect(existsSync(file)).toBeFalsy()
     }
 
     await core.createStubs()
 
-    for (const file of files) {
+    for (const file in files) {
       expect(
         readFileSync(file)
           .toString()
-          .replace(/from '.*\/fixture/, "from '/fixture")
-      ).toBe(`export * from './../src/index'`)
+          .replace(/'.*\/fixture/, "'/fixture")
+      ).toBe(files[file])
     }
   })
 

src/core/package/index.ts

@@ -342,29 +342,40 @@ export class Package {
       const absPath = entrypoint.replace(/(\.[jt]s)$/, '')
       await writeFile(
         binary,
-        `#!/usr/bin/env node\nconst jiti = require('jiti')()\nmodule.exports = jiti('${absPath}')`
+        [
+          `#!/usr/bin/env node`,
+          `const jiti = require('jiti')()`,
+          `module.exports = jiti('${absPath}')`,
+        ].join('\n')
       )
       await this.setBinaryPermissions()
     })
   }
 
-  async createStub(path: string | undefined) {
+  async createStub(path: string | undefined, cjs = false) {
     if (!path || !this.entrypoint || !this.options.build) return
 
     const outFile = this.resolvePath(path)
     const outDir = dirname(outFile)
     if (!existsSync(outDir)) await mkdirp(outDir)
     const relativeEntrypoint = relative(outDir, this.entrypoint).replace(
-      /(\.[jt]s)$/,
+      /(\.[cm]?[jt]s)$/,
       ''
     )
-    await writeFile(outFile, `export * from './${relativeEntrypoint}'`)
+    const stub = cjs
+      ? [
+          `const jiti = require('jiti')()`,
+          `module.exports = jiti('./${relativeEntrypoint}')`,
+        ].join('\n')
+      : `export * from './${relativeEntrypoint}'`
+
+    await writeFile(outFile, stub)
   }
 
   async createStubs() {
     return Promise.all([
       this.createBinaryStubs(),
-      this.createStub(this.pkg.main),
+      this.createStub(this.pkg.main, true),
       this.createStub(this.pkg.module),
       this.createStub(this.pkg.types),
     ])