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node_modules/loader-runner/lib/loadLoader.js

@@ -0,0 +1,80 @@
+"use strict";
+
+const LoaderLoadingError = require("./LoaderLoadingError");
+
+let url;
+
+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();
+}
+
+module.exports = function loadLoader(loader, callback) {
+	if (loader.type === "module") {
+		try {
+			if (url === undefined) url = require("url");
+
+			// eslint-disable-next-line n/no-unsupported-features/node-builtins
+			const loaderUrl = url.pathToFileURL(loader.path);
+			// eslint-disable-next-line no-eval
+			const modulePromise = eval(
+				`import(${JSON.stringify(loaderUrl.toString())})`
+			);
+
+			modulePromise.then((module) => {
+				handleResult(loader, module, callback);
+			}, callback);
+		} catch (err) {
+			callback(err);
+		}
+	} else {
+		let loadedModule;
+
+		try {
+			loadedModule = require(loader.path);
+		} catch (err) {
+			// 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 (err instanceof Error && err.code === "EMFILE") {
+				const retry = loadLoader.bind(null, loader, callback);
+
+				if (typeof setImmediate === "function") {
+					// node >= 0.9.0
+					return setImmediate(retry);
+				}
+
+				// node < 0.9.0
+				return process.nextTick(retry);
+			}
+
+			return callback(err);
+		}
+
+		return handleResult(loader, loadedModule, callback);
+	}
+};