webpack/lib/ErrorHelpers.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const loaderFlag = "LOADER_EXECUTION";

const webpackOptionsFlag = "WEBPACK_OPTIONS";

exports.cutOffByFlag = (stack, flag) => {
	stack = stack.split("\n");
	for (let i = 0; i < stack.length; i++) {
		if (stack[i].includes(flag)) {
			stack.length = i;
		}
	}
	return stack.join("\n");
};

exports.cutOffLoaderExecution = stack =>
	exports.cutOffByFlag(stack, loaderFlag);

exports.cutOffWebpackOptions = stack =>
	exports.cutOffByFlag(stack, webpackOptionsFlag);

exports.cutOffMultilineMessage = (stack, message) => {
	stack = stack.split("\n");
	message = message.split("\n");

	const result = [];

	stack.forEach((line, idx) => {
		if (!line.includes(message[idx])) result.push(line);
	});

	return result.join("\n");
};

exports.cutOffMessage = (stack, message) => {
	const nextLine = stack.indexOf("\n");
	if (nextLine === -1) {
		return stack === message ? "" : stack;
	} else {
		const firstLine = stack.substr(0, nextLine);
		return firstLine === message ? stack.substr(nextLine + 1) : stack;
	}
};

exports.cleanUp = (stack, message) => {
	stack = exports.cutOffLoaderExecution(stack);
	stack = exports.cutOffMessage(stack, message);
	return stack;
};

exports.cleanUpWebpackOptions = (stack, message) => {
	stack = exports.cutOffWebpackOptions(stack);
	stack = exports.cutOffMultilineMessage(stack, message);
	return stack;
};