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[Bug] Cannot import mjs from cjs if this mjs file is already planned to be imported (ReferenceError: default is not defined) #58061
Description
Activity
changed the title [-]Cannot import mjs from cjs if this mjs file is already planned to be imported (ReferenceError: default is not defined)[/-] [+][Bug] Cannot import mjs from cjs if this mjs file is already planned to be imported (ReferenceError: default is not defined)[/+] on Apr 28, 2025
First shows up in v23.10.0 and v22.15.0
cc @joyeecheung @nodejs/loaders
In v22.14.0 (output for v23.9.0 is different but still gives ERR_REQUIRE_CYCLE_MODULE)
node:internal/modules/esm/loader:346
throw new ERR_REQUIRE_CYCLE_MODULE(message);
^
Error [ERR_REQUIRE_CYCLE_MODULE]: Cannot require() ES Module **PATH_TO**module3.cjs in a cycle. (from **PATH_TO**module2.cjs)
at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:346:15)
at loadESMFromCJS (node:internal/modules/cjs/loader:1385:24)
at Module._compile (node:internal/modules/cjs/loader:1536:5)
at Object..js (node:internal/modules/cjs/loader:1706:10)
at Module.load (node:internal/modules/cjs/loader:1289:32)
at Function._load (node:internal/modules/cjs/loader:1108:12)
at TracingChannel.traceSync (node:diagnostics_channel:322:14)
at wrapModuleLoad (node:internal/modules/cjs/loader:220:24)
at Module.require (node:internal/modules/cjs/loader:1311:12)
at require (node:internal/modules/helpers:136:16) {
code: 'ERR_REQUIRE_CYCLE_MODULE'
}
Node.js v22.14.0Is this the expected behavior in v22.15.0+ / v23.10.0+ ?
I'm not sure ERR_REQUIRE_CYCLE_MODULE error is expected behaivor either.
Also it works if module3 does not have default export.
Thanks for the report, fix in #58067
added a commit that references this issue on May 8, 2025
added a commit that references this issue on May 16, 2025
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added 10 commits that reference this issue on Aug 20, 2025
Version
23.11.0
Platform
What steps will reproduce the bug?
Create module1.mjs:
Create module2.cjs:
Create module3.mjs:
Launch:
How often does it reproduce? Is there a required condition?
100%, no.
What is the expected behavior?
Successful launch
What do you see instead?
require('./module3.mjs') throws this error: