[esbuild] expose the platform option to bundle code run on node

[razonyang]

Dear Hugo team, I'd like request a feature to specify the platform option of esbuild.

Backgrounds

There are many static site hosting platforms that support serverless functions (e.g. Cloudlfare Worker), it would be great if we could bundle JavaScript code that runs on node, which provides better integration capabilities.

With the esbuild platform option, Hugo can be a Node application packing tool.

Pros

1. It's easy to manage, share, and reuse codes between sites through Hugo Modules.
2. Manage configuration in the same place (hugo.yaml and the params option of js.Build).

I am willing to implement it (I have a working local branch) if this request is accepted.

[bep]

Can you elaborate a little about how this ends up in e.g. a Cloudflare worker?

[razonyang]

Sure, Cloudflare Pages offer an advanced mode for serverless functions, which the entry point is _worker.js in output directory (public).

However, currently js.Build can not bundle code that runs on node (or node compatible) if import node's built-in modules, for example,

import { platform } from 'process';

console.log(platform)

It will result in an error when importing Node built-in modules.

...Could not resolve "process"...

With the platform option, Hugo will have the ability to build Node app to integrate with serverless functions.

[github-actions]

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