@compodoc/compodoc/src/utils/promise-sequential.ts

The missing documentation tool for your Angular application

export function promiseSequential(promises) {
    if (!Array.isArray(promises)) {
        throw new Error('First argument need to be an array of Promises');
    }

    return new Promise((resolve, reject) => {
        let count = 0;
        let results = [];

        const iterateeFunc = (previousPromise, currentPromise) => {
            return previousPromise
                .then(function(result) {
                    if (count++ !== 0) {
                        results = results.concat(result);
                    }
                    return currentPromise(result, results, count);
                })
                .catch(err => {
                    return reject(err);
                });
        };

        promises = promises.concat(() => Promise.resolve());

        promises.reduce(iterateeFunc, Promise.resolve(false)).then(res => {
            resolve(results);
        });
    });
}