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Workaround for the Jest process.emit binding bug. #373

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merged 2 commits into from
May 20, 2024
Merged

Workaround for the Jest process.emit binding bug. #373

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e5055da
Add a section for runner options, commented out.
danfuzz May 20, 2024
31111c7
Add a workaround for the Jest `process.emit()` binding bug.
danfuzz May 20, 2024
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6 changes: 6 additions & 0 deletions src/jest.config.mjs
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Expand Up @@ -76,5 +76,11 @@ export default {
`${TESTER_DIR}/lib/node_modules/jest-extended/all`,
`${TESTER_DIR}/lib/code/node_modules/@this/main-tester`
]
},

// Test harness options.
...{
// maxConcurrency: 1,
// maxWorkers: 1
}
};
11 changes: 11 additions & 0 deletions src/main-tester/index.js
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Expand Up @@ -12,3 +12,14 @@ process.on('warning', (warning) => {

console.log('%s: %s\n', warning.name, warning.message);
});

// This works around a bug in Jest's wrapping of `process`: `process.emit` is
// normally inherited from `EventEmitter`, but `source-map-support` directly
// adds an `emit` binding to `process`. _Sometimes_ this happens when Jest is in
// the middle of creating a `SyntheticModule` wrapper for `process`, and if that
// happens at just the wrong time, Node will throw `ReferenceError: Export
// 'emit' is not defined in module`. By putting a direct binding of
// `process.emit` here, we avoid the race (though there is still arguably an
// underlying problem). See this issue in Jest:
// <https://github.com/jestjs/jest/issues/15077>
process.emit = process.emit; // eslint-disable-line no-self-assign