Unable to use a compiler proxy

[lucasmpaim]

Version

15.4.2

Reproduction link

https://github.com/lucasmpaim/testbuild

Steps to reproduce

run yarn build

What is expected?

The build has compiled without problem

What is actually happening?

raised a error compiler.parseComponent is not a function

---

Using this solution: vuejs/vue#3934 with vue-cli project

With this configuration:

  chainWebpack: config => {
    config.module.rule('vue')
      .use('vue-loader')
      .loader('vue-loader')
      .tap(options => {
        options.compiler = VueTemplateCompilerProxy
        options.compilerOptions.preserveWhitespace = false;
        return options
      })
  }

on build process I receive the exception: compiler.parseComponent is not a function, In development is working perfectly, in vue-loader/lib/index.js I put an console.log to check why this is happening, and I notice in sometimes the compiler is a blank object {}.
The log:

App.vue { parseComponent: [Function: parseComponent],
  compile: [Function: compile],
  compileToFunctions: [Function: compileToFunctions],
  ssrCompile: [Function: compile],
  ssrCompileToFunctions: [Function: compileToFunctions] }
App.vue { parseComponent: [Function: parseComponent],
  compile: [Function: compile],
  compileToFunctions: [Function: compileToFunctions],
  ssrCompile: [Function: compile],
  ssrCompileToFunctions: [Function: compileToFunctions] }
App.vue { parseComponent: [Function: parseComponent],
  compile: [Function: compile],
  compileToFunctions: [Function: compileToFunctions],
  ssrCompile: [Function: compile],
  ssrCompileToFunctions: [Function: compileToFunctions] }
App.vue {}
.....

Adding:

   if(options.compiler && !Object.keys(options.compiler).length) options.compiler = null

Before parser executes, everting work fine.

[viruscamp]

I met the same problem. I have temporarily fixed it by disable parallel in vue.config.js.
I think it is caused by the use of 'thread-loader', which is enabled default by vue-cli.

The main node process passes stringified webpack options (includes vue-loader options) to worker processes. Functions could not be passed.