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Merge branch 'master' into observable-improvement

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Sindre Sorhus 2018-12-13 16:52:43 +01:00 • committed by GitHub
commit aa9b4994d3
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4 changed files with 43 additions and 3 deletions
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14
source/index.ts
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@ -2,6 +2,7 @@
/// <reference lib="es2017.sharedmemory"/>
/// <reference lib="esnext.asynciterable"/>
/// <reference lib="dom"/>
import {URL} from 'url';
type TypedArray = Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array;
type Primitive = null | undefined | string | number | boolean | Symbol;
@ -188,6 +189,19 @@ namespace is { // tslint:disable-line:no-namespace
export const directInstanceOf = <T>(instance: unknown, klass: Class<T>): instance is T => Object.getPrototypeOf(instance) === klass.prototype;
export const urlInstance = (value: unknown): value is URL => isObjectOfType<URL>(TypeName.URL)(value);
export const urlString = (value: unknown) => {
if (!string(value)) {
return false;
}
try {
new URL(value); // tslint:disable-line no-unused-expression
return true;
} catch {
return false;
}
};
export const truthy = (value: unknown) => Boolean(value);
export const falsy = (value: unknown) => !value;