esbuild-plugin-esm-cjs-shim

Shims ESM and CJS features, handy if you are building hybrid NPM modules.

Features

Shims when building ESM:

• __filename
• __dirname
• require (require.resolve)

Shims when building CJS:

• import.meta.url

Getting Started

npm install esbuild-plugin-esm-cjs-shim

Load plugin

const { shimPlugin } = require("esbuild-plugin-esm-cjs-shim)";

or if ESM:

import { shimPlugin } = from "esbuild-plugin-esm-cjs-shim";

Add following to your esbuild-conf:

{
    entryPoints: ["./commonjs.entry.js"],
    bundle: true,
    write: false,
+    plugins: [shimPlugin()],
+    format: "esm", // or "cjs" depending on what you need to build
+    platform: "node",
};

Known issues

• All shims are included at this point.

Credits

Idea from tsup, the primary reason for this lib is to create a separate esbuild-plugin.

• https://github.com/egoist/tsup/

Noteworthy libs

• https://www.npmjs.com/package/babel-plugin-transform-import-meta