System:
OS: Linux 6.19 cpe:/o:nixos:nixos:26.05 26.05 (Yarara)
CPU: (20) x64 13th Gen Intel(R) Core(TM) i5-13600KF
Memory: 37.83 GB / 62.63 GB
Container: Yes
Shell: 5.9 - /run/current-system/sw/bin/zsh
Binaries:
Node: 25.8.2 - /etc/profiles/per-user/meyer/bin/node
npm: 11.11.1 - /etc/profiles/per-user/meyer/bin/npm
pnpm: 10.28.2 - /etc/profiles/per-user/meyer/bin/pnpm
bun: 1.3.11 - /etc/profiles/per-user/meyer/bin/bun
Deno: 2.6.10 - /etc/profiles/per-user/meyer/bin/deno
Browsers:
Brave Browser: 146.1.88.134
Chromium: 146.0.7680.164
Firefox: 149.0
Firefox Developer Edition: 149.0
npmPackages:
@rspack/core: rc => 2.0.0-rc.2
/// a.js
import { EventEmitter } from "node:events";
class Foo extends EventEmitter {
}
_ = Foo;
import("./b.js")
/// b.js
import * as _ from "node:path";
import*as e from"node:events";import"node:path";var r={359(){}},o={};function t(e){var s=o[e];if(void 0!==s)return s.exports;var n=o[e]={exports:{}};return r[e](n,n.exports,t),n.exports}class s extends e.a{}_=s,Promise.resolve().then(t.bind(t,359));
System Info
I was able to reproduce this on
1.7.5as well as2.0.0-rc.2Details
if
optimization.mangleExportsis set to"size"andLimitChunkCountPluginis added withmaxChunksset to1, then rspack will produce invalid code for certain imports.Input
Output
Notice that
Fooextendse.ainstead ofe.EventEmitterReproduce link
https://playground.rspack.rs/#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
Reproduce Steps
see playground link and above details