Small utilities by zakodium for zakodium.

npm install @zakodium/utils

import { assertDefinedNotNull } from '@zakodium/utils';

const value: object | string | boolean | number | null | undefined = JSON.parse(someJsonString);

assertDefinedNotNull(value); // throws if value is null or undefined

// value type is object | string | boolean | number

• API Reference

With types mutations.

• function assert(value: unknown, message?: string | (() => string)): asserts value;
• function assertUnreachable(value: never): never;
• function assertDefined<T>(value: T): asserts value is Exclude<T, undefined>;
• function assertDefinedNotNull<T>(value: T): asserts value is Exclude<T, null | undefined>;

• function is<Output>(value: unknown, condition: boolean): value is Output;
• function cast<Output>(value: unknown): asserts value is Output;

• Iterable helpers like map, filter and so on. Could be useful when IteratorHelpers is not available. Or add some more niche helpers like chunkify. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Iterator
• functional helpers like pipe and so on. Could be useful until the pipe operator is not available. https://github.com/tc39/proposal-pipeline-operator

MIT