54 lines
1.9 KiB
TypeScript
54 lines
1.9 KiB
TypeScript
export interface Decorator<TArgs extends any[], FArgs extends any[], TRet extends any, FRet extends any> {
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decorate(f: (...farg: FArgs) => any, ...args: TArgs): (...farg: FArgs) => TRet;
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(...args: TArgs): (target, name: string | symbol, descriptor: TypedPropertyDescriptor<(...farg: FArgs) => FRet>) => void;
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}
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export function decorator<TArgs extends any[], FArgs extends any[], TRet extends any, FRet extends any>
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(decorate: (f: (...farg: FArgs) => FRet, ...args: TArgs) => (...farg: FArgs) => TRet)
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: Decorator<TArgs, FArgs, TRet, FRet> {
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const factory = function (this: Decorator<TArgs, FArgs, TRet, FRet>, ...args: TArgs) {
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return (target, name: string | symbol, descriptor: PropertyDescriptor) => {
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descriptor.value = decorate(descriptor.value, ...args);
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}
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} as Decorator<TArgs, FArgs, TRet, FRet>;
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factory.decorate = decorate;
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return factory;
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}
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export const throttle = decorator(function (decorated, time: number) {
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let timeout;
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return function (this: any, ...args) {
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if (typeof timeout === 'undefined') {
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timeout = window.setTimeout(() => {
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decorated.call(this, ...args);
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timeout = undefined;
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}, time);
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}
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}
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});
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export const debounce = decorator(function (decorated, time: number, max: number = time * 3) {
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let timeout;
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return function (this: any, ...args) {
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if (typeof timeout !== 'undefined') {
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window.clearTimeout(timeout);
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}
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timeout = window.setTimeout(() => {
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timeout = undefined;
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decorated.call(this, ...args);
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}, time);
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}
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});
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export const condition = decorator(function <Args extends any[], Ret extends any>(decorated: (...args: Args) => Ret, predicate: (...args: Args) => boolean) {
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return function (this: any, ...args: Args) {
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if (predicate(...args)) {
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return decorated(...args);
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}
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}
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});
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