Function autoInject

lib/autoInject.js:106–146

(tasks, callback)

 * });
 */
export default function autoInject(tasks, callback) {
    var newTasks = {};

    forOwn(tasks, function (taskFn, key) {
        var params;
        var fnIsAsync = isAsync(taskFn);
        var hasNoDeps =
            (!fnIsAsync && taskFn.length === 1) ||
            (fnIsAsync && taskFn.length === 0);

        if (isArray(taskFn)) {
            params = taskFn.slice(0, -1);
            taskFn = taskFn[taskFn.length - 1];

            newTasks[key] = params.concat(params.length > 0 ? newTask : taskFn);
        } else if (hasNoDeps) {
            // no dependencies, use the function as-is
            newTasks[key] = taskFn;
        } else {
            params = parseParams(taskFn);
            if (taskFn.length === 0 && !fnIsAsync && params.length === 0) {
                throw new Error("autoInject task functions require explicit parameters.");
            }

            // remove callback param
            if (!fnIsAsync) params.pop();

            newTasks[key] = params.concat(newTask);
        }

        function newTask(results, taskCb) {
            var newArgs = arrayMap(params, function (name) {
                return results[name];
            });
            newArgs.push(taskCb);
            wrapAsync(taskFn).apply(null, newArgs);
        }
    });

    auto(newTasks, callback);
}