Unexpected token for dynamic import nested in Promise.all

[DreierF]

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• Use Vite >=2.0. (1.x is no longer supported)
• If the issue is related to 1.x -> 2.0 upgrade, read the Migration Guide first.

Describe the bug

Production build fails to compile the following code snippet:

async function loadThreeJsLibrary() {
    [THREE] = await Promise.all([
      import('three')
      // More import(...)
    ]);
    // Do something with THREE
}

void loadThreeJsLibrary();

Error:

$ vite build
building for production...
Unexpected token
file: /.../vite-project/main.js:10:6
 8: async function loadThreeJsLibrary() {
 9:     [THREE] = await Promise.all([
10:       import('three')
          ^
11:       // More import(...)
12:     ]);
error during build:
Error: Unexpected token
    at error (/.../vite-project/node_modules/rollup/dist/shared/rollup.js:5265:30)
    at Module.error (/.../vite-project/node_modules/rollup/dist/shared/rollup.js:9859:16)
    at tryParse (/.../vite-project/node_modules/rollup/dist/shared/rollup.js:9740:23)
    at Module.setSource (/.../vite-project/node_modules/rollup/dist/shared/rollup.js:10166:19)
    at ModuleLoader.addModuleSource (/.../vite-project/node_modules/rollup/dist/shared/rollup.js:18336:20)
    at async ModuleLoader.fetchModule (/.../vite-project/node_modules/rollup/dist/shared/rollup.js:18392:9)
    at async Promise.all (index 1)
    at async ModuleLoader.fetchStaticDependencies (/.../vite-project/node_modules/rollup/dist/shared/rollup.js:18417:34)
    at async Promise.all (index 0)
    at async ModuleLoader.fetchModule (/.../vite-project/node_modules/rollup/dist/shared/rollup.js:18394:9)

Reproduction

Just add the three package to an empty vanilla vite project and add the lines from above to main.js. Then run yarn build.

Workaround

The build works when extracting the import('three') into a local variable or removing the Promise.all. Since this is just a single occurrence in our code this is not a big issue, but AFAICS this is perfectly valid JS code so it should also compile.

System Info

• vite version: 2.0.0-beta.30
• Operating System: MacOS
• Node version: 14.15.4
• Package manager (npm/yarn/pnpm) and version: yarn