64 lines
1.8 KiB
TypeScript
64 lines
1.8 KiB
TypeScript
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const proto = Object.prototype as any;
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// These are non-standard but offer a more reliable prototype based
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// lookup for properties
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const hasProtoDefinitions = typeof proto.__lookupGetter__ === 'function' &&
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typeof proto.__defineGetter__ === 'function' &&
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typeof proto.__defineSetter__ === 'function';
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export function copyToSelf (target: any) {
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// tslint:disable-next-line
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for (const key in target) {
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if (!target.hasOwnProperty(key)) {
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const getter = hasProtoDefinitions ? target.constructor.prototype.__lookupGetter__(key)
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: Object.getOwnPropertyDescriptor(target, key);
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if (hasProtoDefinitions && getter) {
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target.__defineGetter__(key, getter);
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const setter = target.constructor.prototype.__lookupSetter__(key);
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if (setter) {
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target.__defineSetter__(key, setter);
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}
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} else if (getter) {
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Object.defineProperty(target, key, getter);
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} else {
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target[key] = target[key];
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}
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}
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}
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}
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export function copyProperties <F> (target: F, ...originals: any[]) {
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for (const original of originals) {
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const originalProps = (Object.keys(original) as any)
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.concat(Object.getOwnPropertySymbols(original));
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for (const prop of originalProps) {
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const propDescriptor = Object.getOwnPropertyDescriptor(original, prop);
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if (propDescriptor && !Object.prototype.hasOwnProperty.call(target, prop)) {
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Object.defineProperty(target, prop, propDescriptor);
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}
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}
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}
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return target;
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}
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export function copyFnProperties <F> (target: F, original : any) {
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const internalProps = ['name', 'length'];
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try {
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for (const prop of internalProps) {
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const value = original[prop];
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Object.defineProperty(target, prop, { value });
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}
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} catch (e) {
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// Avoid IE error
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}
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return target;
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}
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