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The Value is non of these types error thrown for invalid return value in function options is difficult to figure the reason #9005

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The Value is non of these types error thrown for invalid return value in function options is difficult to figure the reason#9005
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shulaodacopilot-swe-agent
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p2: significant / minor bugscope: dx
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Q2 M1
@sapphi-red

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@sapphi-red
sapphi-red
opened on Apr 6, 2026
import { defineConfig } from 'rolldown'

export default defineConfig({
  input: "./index.js",
  // should return boolean, but returns a number
  external: id => ['foo'].find(name => id === name)
})

errors with

<anonymous_script>:0


[Error: Value is non of these types `bool`, `UnknownReturnValue`, ] {
  code: 'InvalidArg'
}

.
REPL

This error message is difficult to understand. It would be better to show the stacktrace if possible. If that's difficult, we should show the option name.

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p2: significant / minor bugscope: dx

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Vite 8 migration blockers

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