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Jul 15, 2025
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docs: explain node import swallowing error #5401

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2 changes: 2 additions & 0 deletions docs-next/src/content/docs/explainers/nodejs-native-esm-support.mdx
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Expand Up @@ -29,5 +29,7 @@ More information can be found in the [Node.js documentation](https://nodejs.org/
- [Watch mode](../running/cli#--watch--w) does not support ES Module test files
- [Custom reporters](../reporters/third-party) and [custom interfaces](../interfaces/third-party) can only be CommonJS files
- [Configuration file](../running/configuring) can only be a CommonJS file (`.mocharc.js` or `.mocharc.cjs`)
- Mocha in Node.js version 24.4.0 or older [silently ignored top level errors in ESM files](https://github.com/mochajs/mocha/issues/5396).
If you cannot upgrade to a newer Node.js version, you can add `--no-experimental-require-module` to the `NODE_OPTIONS` environment variable.
- When using module-level mocks via libs like `proxyquire`, `rewiremock` or `rewire`, hold off on using ES modules for your test files.
You can switch to using `testdouble`, which does support ESM.
2 changes: 2 additions & 0 deletions docs/index.md
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Expand Up @@ -2131,6 +2131,8 @@ More information can be found in the [Node.js documentation](https://nodejs.org/
- [Custom reporters](#third-party-reporters) and [custom interfaces](#interfaces)
can only be CommonJS files
- [Configuration file](#configuring-mocha-nodejs) can only be a CommonJS file (`.mocharc.js` or `.mocharc.cjs`)
- Mocha in Node.js version 24.4.0 or older [silently ignored top level errors in ESM files](https://github.com/mochajs/mocha/issues/5396).
If you cannot upgrade to a newer Node.js version, you can add `--no-experimental-require-module` to the `NODE_OPTIONS` environment variable.
- When using module-level mocks via libs like `proxyquire`, `rewiremock` or `rewire`,
hold off on using ES modules for your test files. You can switch to using `testdouble`,
which does support ESM.
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