Package Exports
- @js-utilities/typecheck
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@js-utilities/typecheck) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
Type checking library
A set of super-simple type checkers. Each checker returns boolean value. Most checkers are typescript type predicates.
Installation
npm i -S @js-utilities/typecheckUsage example
import { isCallable } from "@js-utilities/typecheck";
const a: unknown = global.value;
if (isCallable(a)) a();Available checkers:
| Checker | Return type |
|---|---|
isCallable |
boolean |
isFunction |
value is Function |
isArrowFunction |
boolean |
isArray<T> |
value is T[] |
isObject<T> |
value is T |
isBoolean |
value is boolean |
isUndefined |
value is undefined |
isNumber |
value is number |
isString |
value is string |
isSymbol |
value is symbol |
isNull |
value is null |
isMap<T, U> |
value is Map<T, U> |
isSet<T> |
value is Set<T> |
isWeakSet<T> |
value is WeakSet<T> |
isWeakMap<T, U> |
value is WeakMap<T, U> |
isPromise<T> |
value is Promise<T> |