fix: duplicate exports from the same source file are excluded

fix #171

Author: yesmeck

hook.js

@@ -198,12 +198,13 @@ async function processModule ({ srcUrl, context, parentGetSource, parentResolve,
   const exportNames = await getExports(srcUrl, context, parentGetSource)
   const starExports = new Set()
   const setters = new Map()
+  const starExportSources = new Map()
 
-  const addSetter = (name, setter, isStarExport = false) => {
+  const addSetter = (name, source, setter, isStarExport = false) => {
     if (setters.has(name)) {
       if (isStarExport) {
-        // If there's already a matching star export, delete it
-        if (starExports.has(name)) {
+        // If there's already a matching star export and it comes from a different source, delete it
+        if (starExports.has(name) && !starExportSources.get('name').has('source')) {
           setters.delete(name)
         }
         // and return so this is excluded
@@ -220,6 +221,9 @@ async function processModule ({ srcUrl, context, parentGetSource, parentResolve,
       // named exports
       if (isStarExport) {
         starExports.add(name)
+        const sources = starExportSources.get(name) || new Set()
+        sources.add(source)
+        starExportSources.set(name, sources)
       }
 
       setters.set(name, setter)
@@ -249,10 +253,10 @@ async function processModule ({ srcUrl, context, parentGetSource, parentResolve,
       })
 
       for (const [name, setter] of subSetters.entries()) {
-        addSetter(name, setter, true)
+        addSetter(name, srcUrl, setter, true)
       }
     } else {
-      addSetter(n, `
+      addSetter(n, srcUrl, `
       let $${n}
       try {
         $${n} = _.${n} = namespace.${n}

test/fixtures/duplicate-d.mjs

@@ -0,0 +1 @@
+export * from './duplicate-a.mjs'

test/fixtures/duplicate-same-source.mjs

@@ -0,0 +1,2 @@
+export * from './duplicate-a.mjs'
+export * from './duplicate-d.mjs'

test/hook/duplicate-exports-same-source.mjs

@@ -0,0 +1,15 @@
+import * as lib from '../fixtures/duplicate-same-source.mjs'
+import { notEqual, strictEqual } from 'assert'
+import Hook from '../../index.js'
+
+Hook((exports, name) => {
+  if (name.match(/duplicate-same-source\.mjs/)) {
+    // foo should be exported because it comes from the same source
+    strictEqual('foo' in exports, true)
+  }
+})
+
+notEqual(lib, undefined)
+
+// foo should be exported because it comes from the same source
+strictEqual('foo' in lib, true)