57 lines
1.2 KiB
Plaintext
57 lines
1.2 KiB
Plaintext
---
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description: 'Require using Error objects as Promise rejection reasons.'
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---
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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> 🛑 This file is source code, not the primary documentation location! 🛑
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>
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> See **https://typescript-eslint.io/rules/prefer-promise-reject-errors** for documentation.
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This rule extends the base [`eslint/prefer-promise-reject-errors`](https://eslint.org/docs/rules/prefer-promise-reject-errors) rule.
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It uses type information to enforce that `Promise`s are only rejected with `Error` objects.
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## Examples
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<Tabs>
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<TabItem value="❌ Incorrect">
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```ts
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Promise.reject('error');
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const err = new Error();
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Promise.reject('an ' + err);
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new Promise((resolve, reject) => reject('error'));
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new Promise((resolve, reject) => {
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const err = new Error();
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reject('an ' + err);
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});
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```
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</TabItem>
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<TabItem value="✅ Correct">
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```ts
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Promise.reject(new Error());
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class CustomError extends Error {
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// ...
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}
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Promise.reject(new CustomError());
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new Promise((resolve, reject) => reject(new Error()));
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new Promise((resolve, reject) => {
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class CustomError extends Error {
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// ...
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}
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return reject(new CustomError());
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});
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```
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</TabItem>
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</Tabs>
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