CommonJS build do not include compiler

[yabab-dev]

Version

3.0.0-alpha.8 / master branch

Reproduction link

https://github.com/chymz/vue-next-cjs-full-issue

Steps to reproduce

Just use vue@next package in a NodeJS environment, setup a component with only a template string.

What is expected?

Compiling template works

What is actually happening?

An HTML comment is rendered instead of the expected markup and a warning message is displayed:

[Vue warn]: Component provides template but the build of Vue you are running does not support runtime template compilation. Either use the full build or pre-compile the template using Vue CLI.

---

I've dig the code a bit, If I understand correclty, vue package is now a full-build (runtime-dom + compiler-dom).
I think the main issue here come from the __RUNTIME_COMPILE__ build variable.

Full-build works with ESM & Global builds, all the needed packages are built with __RUNTIME_COMPILE__ to true and bundled together in one file by rollup.
But this behavior fail for CommonJS build, because vue/dist/vue.cjs.js require @vue/runtime-core with a __RUNTIME_COMPILE__ set to false.

Maybe this leads to another issue: we cannot register a compiler on runtime.
If we take this part of the code: https://github.com/vuejs/vue-next/blob/master/packages/runtime-core/src/component.ts#L420-L447

let compile: CompileFunction | undefined

// exported method uses any to avoid d.ts relying on the compiler types.
export function registerRuntimeCompiler(_compile: any) {
  compile = _compile
}

function finishComponentSetup(
  instance: ComponentInternalInstance,
  parentSuspense: SuspenseBoundary | null,
  isSSR: boolean
) {
  // More code here...

  if (__RUNTIME_COMPILE__ && Component.template && !Component.render) {
    // __RUNTIME_COMPILE__ ensures `compile` is provided
    Component.render = compile!(Component.template, {
      isCustomElement: instance.appContext.config.isCustomElement || NO
    })
    // mark the function as runtime compiled
    ;(Component.render as RenderFunction).isRuntimeCompiled = true
  }

  // More code here...
}

With __RUNTIME_COMPILE__ to false and after rollup tree-shaking, the output code will be:

function registerRuntimeCompiler(_compile) {
}
function finishComponentSetup(instance, parentSuspense, isSSR) {
  // More code here...
}

As you can see, compile variable which hold the compiler function is totally deleted of the source code.

What I've tried:

• Using directly @vue/{runtime,compiler}-dom but problem was the same, theses builds use __RUNTIME_COMPILE__ to false
• Trying to remove __RUNTIME_COMPILE__ from packages, everytinh works, but 3 tests fails now. Sample commit here

Maybe it's an intended behavior or a bad usage, I'm sorry to wasting your time 😄