From 8db4b72678da47f5cfacd5607a2a0f04bde5c661 Mon Sep 17 00:00:00 2001
From: Michael FIG <mfig@agoric.com>
Date: Sat, 15 May 2021 19:12:22 -0600
Subject: [PATCH] fix: implement
 https://github.com/standard-things/esm/pull/877

---
 src/module.js                     | 5 +++++
 src/shim/module-js-file-loader.js | 8 ++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 src/shim/module-js-file-loader.js

diff --git a/src/module.js b/src/module.js
index a543ac79a..867bfca2c 100644
--- a/src/module.js
+++ b/src/module.js
@@ -27,6 +27,7 @@ import staticResolveFilename from "./module/static/resolve-filename.js"
 import staticResolveLookupPaths from "./module/static/resolve-lookup-paths.js"
 import staticWrap from "./module/static/wrap.js"
 import staticWrapper from "./module/static/wrapper.js"
+import jsFileLoader from "./shim/module-js-file-loader"
 
 const {
   ELECTRON
@@ -51,6 +52,10 @@ const Module = maskFunction(function (id = "", parent) {
   }
 }, RealModule)
 
+// Patch the loader for files with .js extension to prevent default
+// behaviour of erroring on commonjs syntax in dependencies.
+RealModule._extensions[".js"] = jsFileLoader
+
 Module._cache = __non_webpack_require__.cache
 Module._extensions = { __proto__: null }
 Module._findPath = staticFindPath
diff --git a/src/shim/module-js-file-loader.js b/src/shim/module-js-file-loader.js
new file mode 100644
index 000000000..2be9cf533
--- /dev/null
+++ b/src/shim/module-js-file-loader.js
@@ -0,0 +1,8 @@
+import { readFileSync } from "fs"
+
+function jsFileLoader(module, filename) {
+  const content = readFileSync(filename, "utf8")
+  module._compile(content, filename)
+}
+
+export default jsFileLoader