Proload doesn't work with esbuild as an external package.

[Alexandre-Fernandez]

When setting proload to external in esbuild, it fails to load.

Reproduction :

• git clone https://github.com/Alexandre-Fernandez/esbuild-proload &&
• cd esbuild-proload &&
• npm i &&
• npm run debug

Reason (evanw/esbuild#2650 (comment)) :

This is because the CJS wrapper in @proload/core does not re-export the same object (the load function) in ESM module.

// @proload/core/lib/cjs/index.cjs
function load(...args) {
    return import('../esm/index.mjs').then(({ default: loader }) => loader(...args));
    //                                                 ^ the real load function in ESM
}

The real one (in ESM module) does have the load.use() method, while the CJS one does not implement corresponding wrapper.

You can compile your script to ESM format with format: 'esm', which should work. (Don't forget to change the extension to .mjs for node.js to run correctly).

As for the package author, they can implement such wrapper instead,

// @proload/core/lib/cjs/index.cjs
let _use_plugins
async function load(...args) {
  const mod = await import('../esm/index.mjs')
  if (_use_plugins) {
    mod.default.use(_use_plugins)
    _use_plugins = undefined
  }
  return (0, mod.default)(...args)
}
load.use = function use(plugins) {
  (_use_plugins ||= []).push(...plugins)
  load.plugins.push(...plugins) // XXX not the same array in ESM!
}
// caveat: cannot wrap `load.plugins` correctly because it is sync
load.plugins = []