twig-loader/test/fakeModuleSystem.js

var fs = require("fs");
var path = require("path");

module.exports = function runLoader(loader, directory, filename, arg, callback) {
    var async = true;
    var loaderContext = {
        async: function () {
            async = true;
            return callback;
        },
        loaders: ["itself"],
        loaderIndex: 0,
        query: "",
        resource: filename,
        callback: function () {
            async = true;
            return callback.apply(this, arguments);
        },
        resolve: function (context, request, callback) {
            // fake resolve extension
            if (request.indexOf('.twig') === -1) request = request + '.twig';

            var resolved = path.resolve(context, request);

            // fake webpack resolve on disk
            var exists = fs.existsSync(resolved);

            if (exists) {
                callback(null, resolved);
            } else {
                callback(new Error("Can't resolve '" + resolved + "' in '" + context + "'"));
            }
        },
        loadModule: function (request, callback) {
            request = request.replace(/^-?!+/, "");
            request = request.split("!");
            var content = fs.readFileSync(request.pop(), "utf-8");
            if (request[0] && /stringify/.test(request[0])) {
                content = JSON.stringify(content);
            }
            return callback(null, content);
        },
        options: {
            context: ''
        }
    };
    var res = loader.call(loaderContext, arg);
    if (!async) callback(null, res);
}