1 files changed, 104 insertions, 0 deletions
diff --git a/src/bun.js/module.exports.js b/src/bun.js/module.exports.js
new file mode 100644
index 000000000..f0817a059
--- /dev/null
+++ b/src/bun.js/module.exports.js
@@ -0,0 +1,104 @@
+function resolve(request, args) {
+  if (typeof args === "object" && args?.paths?.length) {
+    return this.resolveSync(request, args);
+  }
+
+  return this.resolveSync(request);
+}
+
+// not implemented
+resolve.paths = () => [];
+
+function require(pathString) {
+  // this refers to an ImportMeta instance
+  const resolved = this.resolveSync(pathString);
+  if (
+    !resolved.endsWith(".node") &&
+    !resolved.endsWith(".json") &&
+    !resolved.endsWith(".toml")
+  ) {
+    throw new Error(
+      "Dynamic require() in Bun.js currently only supports .node, .json, and .toml files.\n\tConsider using ESM import() instead."
+    );
+  }
+
+  return this.require(resolved);
+}
+
+const main = {
+  get() {
+    return Bun.main;
+  },
+  set() {
+    return false;
+  },
+  configurable: false,
+};
+
+export function createRequire(filename) {
+  var filenameString = filename;
+  const isURL =
+    typeof filename === "object" && filename && filename instanceof URL;
+  if (isURL) {
+    filenameString = filename.pathname;
+  }
+
+  var lastSlash = filenameString.lastIndexOf(
+    // TODO: WINDOWS
+    // windows is more complicated here
+    // but we don't support windows yet
+    process.platform !== "win32" ? "/" : "\\"
+  );
+  var customImportMeta = {
+    ...import.meta,
+    path: filenameString,
+    file:
+      lastSlash > -1 ? filenameString.substring(lastSlash + 1) : filenameString,
+    dir: lastSlash > -1 ? filenameString.substring(0, lastSlash) : "",
+  };
+
+  if (isURL) {
+    customImportMeta.url = filename;
+  } else {
+    // lazy because URL is slow and also can throw
+    Object.defineProperty(customImportMeta, "url", {
+      get() {
+        const value = new URL("file://" + customImportMeta.path).href;
+        Object.defineProperty(customImportMeta, "url", {
+          value,
+        });
+        return value;
+      },
+      configurable: true,
+    });
+  }
+
+  var bound = require.bind(customImportMeta);
+  bound.resolve = resolve.bind(customImportMeta);
+
+  // do this one lazily
+  Object.defineProperty(bound, "main", main);
+
+  return bound;
+}
+
+// this isn't exhaustive
+export const builtinModules = ["node:path", "node:fs", "bun:ffi", "bun:sqlite"];
+
+// noop
+export function syncBuiltinESMExports() {}
+
+export function findSourceMap(path) {
+  throw new Error("findSourceMap is not implemented");
+}
+
+export function SourceMap() {
+  throw new Error("SourceMap is not implemented");
+}
+
+export default {
+  createRequire,
+  syncBuiltinESMExports,
+  findSourceMap,
+  SourceMap,
+};