truthyPromiseOrThrow

Returns a function that passes through truthy data or throws an error.

Available since v1.0.0

Import

import { truthyPromiseOrThrow } from '@helpers4/promise';
// or, from the all-in-one package (same code, one install):
import { truthyPromiseOrThrow } from 'helpers4/promise';

Signature

truthyPromiseOrThrow<T>(error: string): function

Parameters

Parameter	Type	Description
error	string	The error message to throw if data is falsy

Returns

function — A function that returns the data if truthy, or throws

Examples

Pass through truthy values

Returns the value if truthy, throws otherwise.

Promise.resolve('data').then(truthyPromiseOrThrow('No data'))
// => 'data'

Throw on falsy values

Throws an error when the value is falsy.

Promise.resolve('').then(truthyPromiseOrThrow('Empty!'))
// throws Error('Empty!')

Source

View source on GitHub