SyntaxError: /xx.vue: Unexpected token, expected “,“错误解决

Syntax Error: SyntaxError: /xxxxx.vue Unexpected token, expected "," (1:8)
> 1 | [object Promise]
    |         ^
  2 | export { render, staticRenderFns }

Default value changed from es5 to all in v3.0.0
Print trailing commas wherever possible in multi-line comma-separated syntactic structures. (A single-line array, for example, never gets trailing commas.)
Valid options:
"all" - Trailing commas wherever possible (including function parameters and calls). To run, JavaScript code formatted this way needs an engine that supports ES2017 (Node.js 8+ or a modern browser) or downlevel compilation. This also enables trailing commas in type parameters in TypeScript (supported since TypeScript 2.7 released in January 2018).
"es5" - Trailing commas where valid in ES5 (objects, arrays, etc.). No trailing commas in type parameters in TypeScript.
"none" - No trailing commas.

{
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          // vue loader在处理.vue模板时默认不用prettier格式化
          prettify: false,
        },
   },