ts-extras/distribution/assert-defined.js

Essential utilities for TypeScript projects

import { isDefined } from './is-defined.js';
/**
Assert that the given value is defined, meaning it is not `undefined`.

If the value is `undefined`, a helpful `TypeError` will be thrown.

@example
```
import {assertDefined} from 'ts-extras';

const unicorn = 'unicorn';
assertDefined(unicorn);

const notUnicorn = undefined;
assertDefined(notUnicorn);
//=> TypeError: Expected a defined value, got `undefined`
```

@category Type guard
*/
export function assertDefined(value) {
    if (!isDefined(value)) {
        throw new TypeError('Expected a defined value, got `undefined`');
    }
}