Consider the following script:
// index.ts
import gitly from 'gitly';
gitly("https://github.com/iwatakeshi/gitly", process.cwd(), {});Building it with various bundlers to ESM works fine:
npx esbuild --format=esm index.tsnpx tsup --format esm index.tsnpx tsdown --format esm index.ts
However, any of the resulting scripts will produce a runtime error:
import { rm as rm2 } from "shelljs";
^^
SyntaxError: Named export 'rm' not found. The requested module 'shelljs' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:
import pkg from 'shelljs';
const { rm: rm2 } = pkg;
at #_instantiate (node:internal/modules/esm/module_job:254:21)
at async ModuleJob.run (node:internal/modules/esm/module_job:369:5)
at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:691:26)
at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:101:5)
Node.js v24.11.0
When I change the build-target to CommonJS, everything works as desired. Following the suggestion from the error message will likely fix the issue.
Update This error is NodeJS-specific. Since you checked in a lockfile for Bun, I tested it there aswell and don't get an error.
Consider the following script:
Building it with various bundlers to ESM works fine:
npx esbuild --format=esm index.tsnpx tsup --format esm index.tsnpx tsdown --format esm index.tsHowever, any of the resulting scripts will produce a runtime error:
When I change the build-target to CommonJS, everything works as desired. Following the suggestion from the error message will likely fix the issue.
Update This error is NodeJS-specific. Since you checked in a lockfile for Bun, I tested it there aswell and don't get an error.