Error when mixing ESM and CJS #749
Description
In a project with "type": "module" in the package.json that also contains .cjs files, the .cjs files cannot access the global variables __filename, __dirname, etc that should be available to commonjs files.
I've created https://github.com/joeldenning/ncc-mixed-modules to demonstrate the problem.
~/c/ncc-mixed-modules (main|✔) $ node dist/index.js
file:///Users/joeldenning/code/ncc-mixed-modules/dist/index.js:6
console.log("dep.cjs executing", __filename)
^
ReferenceError: __filename is not defined in ES module scope
This file is being treated as an ES module because it has a '.js' file extension and '/Users/joeldenning/code/ncc-mixed-modules/dist/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.
at Object.135 (file:///Users/joeldenning/code/ncc-mixed-modules/dist/index.js:6:34)
at __nccwpck_require__ (file:///Users/joeldenning/code/ncc-mixed-modules/dist/index.js:32:41)
at file:///Users/joeldenning/code/ncc-mixed-modules/dist/index.js:52:66
at file:///Users/joeldenning/code/ncc-mixed-modules/dist/index.js:56:3
at ModuleJob.run (node:internal/modules/esm/module_job:175:25)
at async Loader.import (node:internal/modules/esm/loader:178:24)
at async Object.loadESM (node:internal/process/esm_loader:68:5)
at async handleMainPromise (node:internal/modules/run_main:63:12)