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Improve the is.observable check (#74)

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Fixes #72
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Sindre Sorhus 2018-12-13 16:52:55 +01:00 • committed by GitHub
parent 566f363632
commit 844b43c9df
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3 changed files with 28 additions and 13 deletions
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18
source/index.ts
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@ -2,7 +2,6 @@
/// <reference lib="es2017.sharedmemory"/>
/// <reference lib="esnext.asynciterable"/>
/// <reference lib="dom"/>
import symbolObservable from 'symbol-observable';
import {URL} from 'url';
type TypedArray = Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array;
@ -278,7 +277,22 @@ namespace is { // tslint:disable-line:no-namespace
export const domElement = (value: unknown): value is DomElement => object(value) && (value as DomElement).nodeType === NODE_TYPE_ELEMENT && string((value as DomElement).nodeName) &&
!plainObject(value) && DOM_PROPERTIES_TO_CHECK.every(property => property in (value as DomElement));
export const observable = (value: unknown) => Boolean(value && (value as any)[symbolObservable] && value === (value as any)[symbolObservable]());
export const observable = (value: unknown) => {
if (!value) {
return false;
}
if ((value as any)[Symbol.observable] && value === (value as any)[Symbol.observable]()) {
return true;
}
if ((value as any)['@@observable'] && value === (value as any)['@@observable']()) {
return true;
}
return false;
};
export const nodeStream = (value: unknown): value is NodeStream => !nullOrUndefined(value) && isObject(value) as unknown && function_((value as NodeStream).pipe) && !observable(value);
export const infinite = (value: unknown) => value === Infinity || value === -Infinity;