detect-environment/lib/findAliasName.js

Detect environments in JavaScript similar to the way Laravel does

'use strict';

var
    //
    hasProp = require('has-own-prop'),

    /**
     *
     */
    findAliasName = function findAliasName (options, envName) {

        //
        if (!options.fallback || typeof options.fallback !== 'string') {
            throw new TypeError('findAliasName:');
        }

        //
        if (!envName || typeof envName !== 'string') {
            envName = options.fallback;
        }

        var
            //
            aliases = options.aliases,

            //
            found = false,

            //
            key;

        //
        if (options.aliases === null) {
            return envName;
        }

        //
        if (Object.prototype.toString.call(aliases) !== '[object Object]') {
            throw new TypeError('findAliasName:');
        }

        //
        for (key in aliases) {
            if (hasProp(aliases, key)) {

                //
                if (!aliases[key]) {
                    throw new TypeError('findAliasName:');
                }

                //
                if (typeof aliases[key] === 'string') {
                    aliases[key] = [aliases[key]];
                }

                //
                if (!Array.isArray(aliases[key])) {
                    throw new TypeError('findAliasName:');
                }

                //
                found = aliases[key].some(function (alias) {

                    //
                    if (!alias || typeof alias !== 'string') {
                        throw new TypeError('findAliasName:');
                    }

                    //
                    if (alias === envName) {
                        envName = key;
                        return true;
                    }

                    //
                    return false;

                });

                //
                if (found) {
                    break;
                }

            }

        }

        //
        return envName;

    };

// Expose to node.js
module.exports = findAliasName;