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Sindre Sorhus 2024-04-23 12:57:01 +07:00 • committed by GitHub
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@ -45,13 +45,13 @@ assert.string(2);
//=> Error: Expected value which is `string`, received value of type `number`.
```
Most assertions also support an optional custom error message.
Assertions (except `assertAll` and `assertAny`) also support an optional custom error message.
```js
import {assert} from '@sindresorhus/is';
assert.nonEmptyString(process.env.API_URL, 'API_URL env variable is required.');
//=> Error: API_URL env variable is required.
assert.nonEmptyString(process.env.API_URL, 'The API_URL environment variable is required.');
//=> Error: The API_URL environment variable is required.
```
And with TypeScript: