@zodash/compose/lib/compose.js

compose functions

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.compose = void 0;
/**
 * Compose function
 *
 * @param middlewares componse functions
 */
function compose(...middlewares) {
    return (context, next) => {
        let index = -1;
        function dispatch(i) {
            if (i <= index) {
                return Promise.reject(new Error('next() called multiple times'));
            }
            index = i;
            let fn = middlewares[i];
            if (i === middlewares.length)
                fn = next;
            if (!fn)
                return Promise.resolve();
            try {
                return Promise.resolve(fn(context, dispatch.bind(null, i + 1)));
            }
            catch (err) {
                return Promise.reject(err);
            }
        }
        return dispatch(0);
    };
}
exports.compose = compose;