63 lines
1.5 KiB
TypeScript
63 lines
1.5 KiB
TypeScript
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export interface CancellablePromise<T> extends Promise<T> {
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resolve?: (...args: any[]) => void,
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reject?: (...args: any[]) => void,
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cancel?: () => void,
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notify?: (...args: any[]) => void,
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notifyAll?: (...args: any[]) => void,
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lastNotify?: any,
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listeners?: Array<(...args: any[]) => void>,
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addNotifyListener?: (callback: (...args: any[]) => void) => void,
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isFulfilled?: boolean,
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isRejected?: boolean
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}
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export function deferredPromise<T>() {
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let deferredHelper: any = {
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isFulfilled: false,
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isRejected: false,
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notify: () => {},
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notifyAll: (...args: any[]) => {
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deferredHelper.lastNotify = args;
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deferredHelper.listeners.forEach((callback: any) => callback(...args));
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},
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lastNotify: undefined,
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listeners: [],
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addNotifyListener: (callback: (...args: any[]) => void) => {
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if(deferredHelper.lastNotify) {
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callback(...deferredHelper.lastNotify);
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}
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deferredHelper.listeners.push(callback);
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}
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};
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let deferred: CancellablePromise<T> = new Promise<T>((resolve, reject) => {
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deferredHelper.resolve = (value: T) => {
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if(deferred.isFulfilled) return;
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deferred.isFulfilled = true;
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resolve(value);
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};
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deferredHelper.reject = (...args: any[]) => {
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if(deferred.isRejected) return;
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deferred.isRejected = true;
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reject(...args);
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};
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});
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deferred.finally(() => {
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deferred.notify = null;
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deferred.listeners.length = 0;
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deferred.lastNotify = null;
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});
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Object.assign(deferred, deferredHelper);
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return deferred;
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}
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