Method chain

src/platform/common/utils/async.ts:161–176

* Chain the provided promise after all previous promises have successfully completed. * If the previously chained promises have failed, then this call will fail.

(promise: () => Promise<T>)

     * If the previously chained promises have failed, then this call will fail.
     */
    public async chain<T>(promise: () => Promise<T>): Promise<T> {
        const deferred = createDeferred<T>();
        const previousPromise = this.currentPromise;
        this.currentPromise = this.currentPromise.then(async () => {
            try {
                const result = await promise();
                deferred.resolve(result);
            } catch (ex) {
                deferred.reject(ex);
                throw ex;
            }
        });
        // Wait for previous promises to complete.
        await previousPromise;
        return deferred.promise;
    }
    /**
     * Chain the provided promise after all previous promises have completed (ignoring errors in previous promises).
     */