utils promise.ts

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25% Branches 1/4

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  export type Cancellable<T> = { promise: PromiseLike<T>; cancel: () => void }
 
export class CancellableError extends Error {}
 
export function makeCancellable<T>(promise: PromiseLike<T>): Cancellable<T> {
    let hasCanceled_ = false
 
    const wrappedPromise = new Promise<T>((resolve, reject) => {
        // eslint-disable-next-line promise/prefer-await-to-then
        return promise.then(
            val => 
                hasCanceled_
                    ? reject(new CancellableError("cancelled promise"))
                    : resolve(val)
            ,
            error => 
                hasCanceled_
                    ? reject(new CancellableError("cancelled promise"))
                    : reject(error)
            
        )
    })
 
    return {
        promise: wrappedPromise,
        cancel() {
            hasCanceled_ = true
        },
    }
}