pipio/dist/require/pipio.js

Chain functions together and handle a complex workflow

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.pipio = exports.Pipio = void 0;
const utils_1 = require("./utils");
class Pipio {
    constructor(handlers) {
        this.handlers = handlers;
    }
    /**
     * Add a new middleware to the pipeline
     * @param fn Middleware function
     * @returns {Pipio} A new instance of the pipio with the handler setup
     */
    use(fn) {
        return new Pipio([...this.handlers, fn]);
    }
    /**
     * Build the pipeline and create a callable function
     * @param params Build-time parameters
     * @returns The wrapper function of the pipeline
     */
    build(params) {
        return (...args) => __awaiter(this, void 0, void 0, function* () {
            let output = args;
            for (const fn of this.handlers) {
                try {
                    // call the function with the previous call result
                    const handlerResult = fn(output);
                    // if handler returns a promise, the we need to wait,
                    // otherwise, we're good to go
                    if ((0, utils_1.isPromise)(handlerResult) === true) {
                        output = yield handlerResult;
                    }
                    else {
                        output = handlerResult;
                    }
                }
                catch (e) {
                    // user handles the error, pass the error to their handler
                    if (typeof (params === null || params === void 0 ? void 0 : params.onError) === 'function') {
                        return params === null || params === void 0 ? void 0 : params.onError(e);
                    }
                    // no handler found, throw error
                    throw e;
                }
            }
            // no more item in the stack
            if (this.handlers.length === 0) {
                output = undefined;
            }
            return output;
        });
    }
}
exports.Pipio = Pipio;
/**
 * pipio create factory
 * @param fn Main middleware
 * @returns {Pipio} A new instance of pipio with the first handler configured
 */
const pipio = (fn) => {
    return new Pipio([fn]);
};
exports.pipio = pipio;