mirror of https://github.com/jkjoy/sunpeiwen.git
55 lines
1.6 KiB
JavaScript
55 lines
1.6 KiB
JavaScript
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var LoaderLoadingError = require("./LoaderLoadingError");
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var url;
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module.exports = function loadLoader(loader, callback) {
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if(loader.type === "module") {
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try {
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if(url === undefined) url = require("url");
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var loaderUrl = url.pathToFileURL(loader.path);
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var modulePromise = eval("import(" + JSON.stringify(loaderUrl.toString()) + ")");
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modulePromise.then(function(module) {
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handleResult(loader, module, callback);
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}, callback);
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return;
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} catch(e) {
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callback(e);
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}
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} else {
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try {
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var module = require(loader.path);
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} catch(e) {
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// it is possible for node to choke on a require if the FD descriptor
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// limit has been reached. give it a chance to recover.
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if(e instanceof Error && e.code === "EMFILE") {
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var retry = loadLoader.bind(null, loader, callback);
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if(typeof setImmediate === "function") {
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// node >= 0.9.0
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return setImmediate(retry);
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} else {
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// node < 0.9.0
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return process.nextTick(retry);
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}
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}
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return callback(e);
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}
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return handleResult(loader, module, callback);
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}
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};
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function handleResult(loader, module, callback) {
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if(typeof module !== "function" && typeof module !== "object") {
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return callback(new LoaderLoadingError(
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"Module '" + loader.path + "' is not a loader (export function or es6 module)"
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));
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}
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loader.normal = typeof module === "function" ? module : module.default;
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loader.pitch = module.pitch;
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loader.raw = module.raw;
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if(typeof loader.normal !== "function" && typeof loader.pitch !== "function") {
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return callback(new LoaderLoadingError(
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"Module '" + loader.path + "' is not a loader (must have normal or pitch function)"
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));
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}
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callback();
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}
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