feat(build): Add netlify-functions adapter

[chadxz]

Why?

So we can build a bundle targetting the netlify-functions runtime.

How?

• Extend EntryContentOptions with entryContentDefaultExportHook to allow customizing the way the default export of the bundle is built.

• Alter getEntryContent to use the entryContentDefaultExportHook for defining the default export, defaulting to the previous behavior if not defined.

• Add netlifyFunctionsBuildPlugin as a new exported adapter that wraps the hono app in the hono/netlify handle() adapter and defines a config export to make the hono app respond to the root path in Netlify.

Example

// vite.config.ts
import { defineConfig } from "vite";
import devServer from "@hono/vite-dev-server";
import build from "@hono/vite-build/netlify-functions";

export default defineConfig({
  plugins: [
    devServer({
      entry: "./src/index.ts",
    }),
    build({
      entry: "./src/index.ts",
      output: "functions/server/index.js"
    })
  ],
});

I also have a public/publish directory that I put any assets that should be published to my Netlify site. After running a build, I end up with:

dist/
  functions/
    server/
      index.js
  publish/
    robots.txt
    ....

and my netlify.toml looks like:

# https://ntl.fyi/file-based-build-config
[build]
command = "vite build"
functions = "dist/functions"
publish = "dist/publish"

[changeset-bot]

🦋 Changeset detected

Latest commit: a780f59

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@hono/vite-build	Minor

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