swc_bundler: does not support top level await import statements

[kitsonk]

Describe the bug

swc_bundler does not appear to handle top level await import statements

Input code

example4.ts

const a = await import("./a.ts");

console.log(a);

a.ts

export const a = "a";

Expected behavior

A valid emit of some sort.

Actual, using the swc_bundler branch/PR:

❯ deno bundle example4.ts example4.bundle.js
Bundle file:///bundle-examples/example4.ts
error: failed to bundle

Version

Version: swc_bundler 0.7.4

Additional context

Working to integrate swc_bundler into Deno.

[kdy1]

I fixed other issues but I have a question about this issue.

Is this an issue about dynamic import itself?

[kitsonk]

I don't know specifically, but it threw an error on what is legitimate code. I didn't dig deeper. If we aren't going to inline dynamic imports (current deno bundle does for most dynamic imports, but that is because it preserves the module structure in the bundle) then I would at least expect them to be preserved in the output.

[kdy1]

Got it, thanks for clarification.

[kdy1]

I checked that following .swcrc works.

{
  "jsc": {
    "parser": {
      "syntax": "typescript",
      "dynamicImport": true
    },
    "target": "es2020"
  }
}

As you are using it from rust, you need to provide recent version of ecmascript to the parser via JscTarget. You also need TsConfig.dynamic_import to be true.

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.