Dynamic imports with substituted ( DefinePlugin) absolute path outputs invalid js

[Nigui]

Hello,

I'm trying to migrate my existing bundler from webpack to rspack and I'm facing a blocking issue.

I'm using dynamic imports with path computed from string template containing a string substituted value (by DefinePlugin) where value is an absolute path as exemple below:

await import(
  /* webpackMode: "eager" */ 
  /* webpackExclude: /\.async\.js$/ */ 
  `${webpackCustomFolder}/myFile.js`
)

with webpackCustomFolder set in config by new DefinePlugin({ webpackCustomFolder: JSON.stringify("/tmp/abc") })

Compilation crashes with error:

ERROR in × JavaScript parsing error: Expected ',', got 'string literal (/tmp/abc, "/tmp/abc")'
      ╭─[3300:125]
 3299 │    __webpack_require__(2608)(/* webpackMode: "eager" */ /* webpackExclude: /\\.async\\.js$/ */ "./""/tmp/abc".concat("/myFile.js"));                                                                                                             ──────────────────────────────────────────────────────────────────
      ╰────

As you can see, javascript is invalid because of this string added before my import path "./".

Of course, hardcoding /tmp/abc in my typescript code works successfully.

Could someone help me to understand where this string is coming from, or how could i debug rspack to understand import rewrite?

Thank you all :slight_smile: