Fix node 20 reexports (#30)

Resolves #29

---------

Co-authored-by: Trent Mick <[email protected]>
Co-authored-by: rochdev <[email protected]>

.eslintrc.yaml

@@ -16,3 +16,8 @@ rules:
 
 extends:
   - "standard"
+
+ignorePatterns:
+  - test/fixtures/circular-a.js
+  - test/fixtures/circular-b.js
+  - test/fixtures/reexport.js

lib/get-exports.js

@@ -3,12 +3,36 @@
 const getEsmExports = require('./get-esm-exports.js')
 const { parse: getCjsExports } = require('cjs-module-lexer')
 const fs = require('fs')
-const { fileURLToPath } = require('url')
+const { fileURLToPath, pathToFileURL } = require('url')
 
 function addDefault (arr) {
   return Array.from(new Set(['default', ...arr]))
 }
 
+const urlsBeingProcessed = new Set() // Guard against circular imports.
+
+async function getFullCjsExports (url, context, parentLoad, source) {
+  if (urlsBeingProcessed.has(url)) {
+    return []
+  }
+  urlsBeingProcessed.add(url)
+
+  const ex = getCjsExports(source)
+  const full = Array.from(new Set([
+    ...addDefault(ex.exports),
+    ...(await Promise.all(ex.reexports.map(re => getExports(({
+      url: (/^(..?($|\/|\\))/).test(re)
+        ? pathToFileURL(require.resolve(fileURLToPath(new URL(re, url)))).toString()
+        : pathToFileURL(require.resolve(re)).toString(),
+      context,
+      parentLoad
+    }))))).flat()
+  ]))
+
+  urlsBeingProcessed.delete(url)
+  return full
+}
+
 /**
  * Inspects a module for its type (commonjs or module), attempts to get the
  * source code for said module from the loader API, and parses the result
@@ -56,7 +80,7 @@ async function getExports ({ url, context, parentLoad, defaultAs = 'default' })
     return getEsmExports({ moduleSource: source, defaultAs })
   }
   if (format === 'commonjs') {
-    return addDefault(getCjsExports(source).exports)
+    return getFullCjsExports(url, context, parentLoad, source)
   }
 
   // At this point our `format` is either undefined or not known by us. Fall
@@ -67,7 +91,7 @@ async function getExports ({ url, context, parentLoad, defaultAs = 'default' })
     // isn't set at first and yet we have an ESM module with no exports.
     // I couldn't construct an example that would do this, so maybe it's
     // impossible?
-    return addDefault(getCjsExports(source).exports)
+    return getFullCjsExports(url, context, parentLoad, source)
   }
 }
 

test/fixtures/circular-a.js

@@ -0,0 +1,18 @@
+// The following is generated by tslib. __exportStar is a format which cjs-module-lexer exposes as a reexport
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+  if (k2 === undefined) k2 = k;
+  Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+  if (k2 === undefined) k2 = k;
+  o[k2] = m[k];
+}));
+var __exportStar = (this && this.__exportStar) || function(m, exports) {
+  for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+
+
+__exportStar(require("./circular-b"), exports);
+
+exports.foo = 42;
+

test/fixtures/circular-b.js

@@ -0,0 +1,15 @@
+// The following is generated by tslib. __exportStar is a format which cjs-module-lexer exposes as a reexport
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+  if (k2 === undefined) k2 = k;
+  Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+  if (k2 === undefined) k2 = k;
+  o[k2] = m[k];
+}));
+var __exportStar = (this && this.__exportStar) || function(m, exports) {
+  for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+
+__exportStar(require("./circular-a"), exports);
+

test/fixtures/reexport.js

@@ -0,0 +1,15 @@
+// The following is generated by tslib. __exportStar is a format which cjs-module-lexer exposes as a reexport
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+  if (k2 === undefined) k2 = k;
+  Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+  if (k2 === undefined) k2 = k;
+  o[k2] = m[k];
+}));
+var __exportStar = (this && this.__exportStar) || function(m, exports) {
+  for (var p in m) if (p !== "default" && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+
+__exportStar(require("./something"), exports);
+

test/hook/circular-imports.mjs

@@ -0,0 +1,11 @@
+import { foo } from '../fixtures/circular-b.js'
+import Hook from '../../index.js'
+import { strictEqual } from 'assert'
+
+Hook((exports, name) => {
+  if (name.match(/circular-[ab].js/)) {
+    exports.foo += 15
+  }
+})
+
+strictEqual(foo, 57)

test/hook/import-reexport-cjs.mjs

@@ -0,0 +1,11 @@
+import { foo } from '../fixtures/reexport.js'
+import Hook from '../../index.js'
+import { strictEqual } from 'assert'
+
+Hook((exports, name) => {
+  if (name.match(/reexport.js/)) {
+    exports.foo += 15
+  }
+})
+
+strictEqual(foo, 57)