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docs: Add warning about async callback for describe #5046

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docs: Add warning about async callback for describe #5046

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docs: Add warning about async callback for describe
mcdurdin Dec 12, 2023
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Update docs/index.md
mcdurdin Mar 5, 2024
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Expand Up @@ -296,6 +296,10 @@ describe('#find()', function () {
});
```

### Limitations of asynchronous callbacks

You can use all three asynchronous patterns (`done`, `Promise`, and `async`/`await`) in callbacks for `it()` and for all hooks (`before()`, `after()`, `beforeEach()`, `afterEach()`), but `describe()` will not work correctly with an asynchronous callback -- it must be synchronous. This is because, in the "parsing" cycle all `describe` callbacks are excecuted and the test hierarchy (`runner`) is created, before any tests are run.
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## Synchronous Code

When testing synchronous code, omit the callback and Mocha will automatically continue on to the next test.
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