source: trip-planner-front/node_modules/loader-runner/lib/loadLoader.js@ eed0bf8

var LoaderLoadingError = require("./LoaderLoadingError");
var url;

module.exports = function loadLoader(loader, callback) {
        if(loader.type === "module") {
                try {
                        if(url === undefined) url = require("url");
                        var loaderUrl = url.pathToFileURL(loader.path);
                        var modulePromise = eval("import(" + JSON.stringify(loaderUrl.toString()) + ")");
                        modulePromise.then(function(module) {
                                handleResult(loader, module, callback);
                        }, callback);
                        return;
                } catch(e) {
                        callback(e);
                }
        } else {
                try {
                        var module = require(loader.path);
                } catch(e) {
                        // it is possible for node to choke on a require if the FD descriptor
                        // limit has been reached. give it a chance to recover.
                        if(e instanceof Error && e.code === "EMFILE") {
                                var retry = loadLoader.bind(null, loader, callback);
                                if(typeof setImmediate === "function") {
                                        // node >= 0.9.0
                                        return setImmediate(retry);
                                } else {
                                        // node < 0.9.0
                                        return process.nextTick(retry);
                                }
                        }
                        return callback(e);
                }
                return handleResult(loader, module, callback);
        }
};

function handleResult(loader, module, callback) {
        if(typeof module !== "function" && typeof module !== "object") {
                return callback(new LoaderLoadingError(
                        "Module '" + loader.path + "' is not a loader (export function or es6 module)"
                ));
        }
        loader.normal = typeof module === "function" ? module : module.default;
        loader.pitch = module.pitch;
        loader.raw = module.raw;
        if(typeof loader.normal !== "function" && typeof loader.pitch !== "function") {
                return callback(new LoaderLoadingError(
                        "Module '" + loader.path + "' is not a loader (must have normal or pitch function)"
                ));
        }
        callback();
}