redis-smq-common/dist/esm/src/async/waterfall.js

Provides essential components and utilities shared across RedisSMQ packages.

export function waterfall(tasks, callback) {
    if (!Array.isArray(tasks)) {
        return callback(new Error('First argument to waterfall must be an array of functions'));
    }
    if (tasks.length === 0) {
        return callback();
    }
    let taskIndex = 0;
    function nextTask(error, result) {
        if (error) {
            return callback(error);
        }
        taskIndex = taskIndex + 1;
        if (taskIndex >= tasks.length) {
            return callback(null, result);
        }
        setImmediate(() => {
            try {
                if (taskIndex === 0) {
                    tasks[taskIndex](nextTask);
                }
                else {
                    tasks[taskIndex](result, nextTask);
                }
            }
            catch (err) {
                callback(err instanceof Error ? err : new Error(String(err)));
            }
        });
    }
    try {
        tasks[0](nextTask);
    }
    catch (err) {
        callback(err instanceof Error ? err : new Error(String(err)));
    }
}
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