var SourceMapConsumer = require('source-map').SourceMapConsumer; var path = require('path'); var fs; try { fs = require('fs'); if (!fs.existsSync || !fs.readFileSync) { // fs doesn't have all methods we need fs = null; } } catch (err) { /* nop */ } var bufferFrom = require('buffer-from'); // Only install once if called multiple times var errorFormatterInstalled = false; var uncaughtShimInstalled = false; // If true, the caches are reset before a stack trace formatting operation var emptyCacheBetweenOperations = false; // Supports {browser, node, auto} var environment = "auto"; // Maps a file path to a string containing the file contents var fileContentsCache = {}; // Maps a file path to a source map for that file var sourceMapCache = {}; // Regex for detecting source maps var reSourceMap = /^data:application\/json[^,]+base64,/; // Priority list of retrieve handlers var retrieveFileHandlers = []; var retrieveMapHandlers = []; function isInBrowser() { if (environment === "browser") return true; if (environment === "node") return false; return ((typeof window !== 'undefined') && (typeof XMLHttpRequest === 'function') && !(window.require && window.module && window.process && window.process.type === "renderer")); } function hasGlobalProcessEventEmitter() { return ((typeof process === 'object') && (process !== null) && (typeof process.on === 'function')); } function handlerExec(list) { return function(arg) { for (var i = 0; i < list.length; i++) { var ret = list[i](arg); if (ret) { return ret; } } return null; }; } var retrieveFile = handlerExec(retrieveFileHandlers); retrieveFileHandlers.push(function(path) { // Trim the path to make sure there is no extra whitespace. path = path.trim(); if (/^file:/.test(path)) { // existsSync/readFileSync can't handle file protocol, but once stripped, it works path = path.replace(/file:\/\/\/(\w:)?/, function(protocol, drive) { return drive ? '' : // file:///C:/dir/file -> C:/dir/file '/'; // file:///root-dir/file -> /root-dir/file }); } if (path in fileContentsCache) { return fileContentsCache[path]; } var contents = ''; try { if (!fs) { // Use SJAX if we are in the browser var xhr = new XMLHttpRequest(); xhr.open('GET', path, /** async */ false); xhr.send(null); if (xhr.readyState === 4 && xhr.status === 200) { contents = xhr.responseText; } } else if (fs.existsSync(path)) { // Otherwise, use the filesystem contents = fs.readFileSync(path, 'utf8'); } } catch (er) { /* ignore any errors */ } return fileContentsCache[path] = contents; }); // Support URLs relative to a directory, but be careful about a protocol prefix // in case we are in the browser (i.e. directories may start with "http://" or "file:///") function supportRelativeURL(file, url) { if (!file) return url; var dir = path.dirname(file); var match = /^\w+:\/\/[^\/]*/.exec(dir); var protocol = match ? match[0] : ''; var startPath = dir.slice(protocol.length); if (protocol && /^\/\w\:/.test(startPath)) { // handle file:///C:/ paths protocol += '/'; return protocol + path.resolve(dir.slice(protocol.length), url).replace(/\\/g, '/'); } return protocol + path.resolve(dir.slice(protocol.length), url); } function retrieveSourceMapURL(source) { var fileData; if (isInBrowser()) { try { var xhr = new XMLHttpRequest(); xhr.open('GET', source, false); xhr.send(null); fileData = xhr.readyState === 4 ? xhr.responseText : null; // Support providing a sourceMappingURL via the SourceMap header var sourceMapHeader = xhr.getResponseHeader("SourceMap") || xhr.getResponseHeader("X-SourceMap"); if (sourceMapHeader) { return sourceMapHeader; } } catch (e) { } } // Get the URL of the source map fileData = retrieveFile(source); var re = /(?:\/\/[@#][ \t]+sourceMappingURL=([^\s'"]+?)[ \t]*$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^\*]+?)[ \t]*(?:\*\/)[ \t]*$)/mg; // Keep executing the search to find the *last* sourceMappingURL to avoid // picking up sourceMappingURLs from comments, strings, etc. var lastMatch, match; while (match = re.exec(fileData)) lastMatch = match; if (!lastMatch) return null; return lastMatch[1]; }; // Can be overridden by the retrieveSourceMap option to install. Takes a // generated source filename; returns a {map, optional url} object, or null if // there is no source map. The map field may be either a string or the parsed // JSON object (ie, it must be a valid argument to the SourceMapConsumer // constructor). var retrieveSourceMap = handlerExec(retrieveMapHandlers); retrieveMapHandlers.push(function(source) { var sourceMappingURL = retrieveSourceMapURL(source); if (!sourceMappingURL) return null; // Read the contents of the source map var sourceMapData; if (reSourceMap.test(sourceMappingURL)) { // Support source map URL as a data url var rawData = sourceMappingURL.slice(sourceMappingURL.indexOf(',') + 1); sourceMapData = bufferFrom(rawData, "base64").toString(); sourceMappingURL = source; } else { // Support source map URLs relative to the source URL sourceMappingURL = supportRelativeURL(source, sourceMappingURL); sourceMapData = retrieveFile(sourceMappingURL); } if (!sourceMapData) { return null; } return { url: sourceMappingURL, map: sourceMapData }; }); function mapSourcePosition(position) { var sourceMap = sourceMapCache[position.source]; if (!sourceMap) { // Call the (overrideable) retrieveSourceMap function to get the source map. var urlAndMap = retrieveSourceMap(position.source); if (urlAndMap) { sourceMap = sourceMapCache[position.source] = { url: urlAndMap.url, map: new SourceMapConsumer(urlAndMap.map) }; // Load all sources stored inline with the source map into the file cache // to pretend like they are already loaded. They may not exist on disk. if (sourceMap.map.sourcesContent) { sourceMap.map.sources.forEach(function(source, i) { var contents = sourceMap.map.sourcesContent[i]; if (contents) { var url = supportRelativeURL(sourceMap.url, source); fileContentsCache[url] = contents; } }); } } else { sourceMap = sourceMapCache[position.source] = { url: null, map: null }; } } // Resolve the source URL relative to the URL of the source map if (sourceMap && sourceMap.map) { var originalPosition = sourceMap.map.originalPositionFor(position); // Only return the original position if a matching line was found. If no // matching line is found then we return position instead, which will cause // the stack trace to print the path and line for the compiled file. It is // better to give a precise location in the compiled file than a vague // location in the original file. if (originalPosition.source !== null) { originalPosition.source = supportRelativeURL( sourceMap.url, originalPosition.source); return originalPosition; } } return position; } // Parses code generated by FormatEvalOrigin(), a function inside V8: // https://code.google.com/p/v8/source/browse/trunk/src/messages.js function mapEvalOrigin(origin) { // Most eval() calls are in this format var match = /^eval at ([^(]+) \((.+):(\d+):(\d+)\)$/.exec(origin); if (match) { var position = mapSourcePosition({ source: match[2], line: +match[3], column: match[4] - 1 }); return 'eval at ' + match[1] + ' (' + position.source + ':' + position.line + ':' + (position.column + 1) + ')'; } // Parse nested eval() calls using recursion match = /^eval at ([^(]+) \((.+)\)$/.exec(origin); if (match) { return 'eval at ' + match[1] + ' (' + mapEvalOrigin(match[2]) + ')'; } // Make sure we still return useful information if we didn't find anything return origin; } // This is copied almost verbatim from the V8 source code at // https://code.google.com/p/v8/source/browse/trunk/src/messages.js. The // implementation of wrapCallSite() used to just forward to the actual source // code of CallSite.prototype.toString but unfortunately a new release of V8 // did something to the prototype chain and broke the shim. The only fix I // could find was copy/paste. function CallSiteToString() { var fileName; var fileLocation = ""; if (this.isNative()) { fileLocation = "native"; } else { fileName = this.getScriptNameOrSourceURL(); if (!fileName && this.isEval()) { fileLocation = this.getEvalOrigin(); fileLocation += ", "; // Expecting source position to follow. } if (fileName) { fileLocation += fileName; } else { // Source code does not originate from a file and is not native, but we // can still get the source position inside the source string, e.g. in // an eval string. fileLocation += ""; } var lineNumber = this.getLineNumber(); if (lineNumber != null) { fileLocation += ":" + lineNumber; var columnNumber = this.getColumnNumber(); if (columnNumber) { fileLocation += ":" + columnNumber; } } } var line = ""; var functionName = this.getFunctionName(); var addSuffix = true; var isConstructor = this.isConstructor(); var isMethodCall = !(this.isToplevel() || isConstructor); if (isMethodCall) { var typeName = this.getTypeName(); // Fixes shim to be backward compatable with Node v0 to v4 if (typeName === "[object Object]") { typeName = "null"; } var methodName = this.getMethodName(); if (functionName) { if (typeName && functionName.indexOf(typeName) != 0) { line += typeName + "."; } line += functionName; if (methodName && functionName.indexOf("." + methodName) != functionName.length - methodName.length - 1) { line += " [as " + methodName + "]"; } } else { line += typeName + "." + (methodName || ""); } } else if (isConstructor) { line += "new " + (functionName || ""); } else if (functionName) { line += functionName; } else { line += fileLocation; addSuffix = false; } if (addSuffix) { line += " (" + fileLocation + ")"; } return line; } function cloneCallSite(frame) { var object = {}; Object.getOwnPropertyNames(Object.getPrototypeOf(frame)).forEach(function(name) { object[name] = /^(?:is|get)/.test(name) ? function() { return frame[name].call(frame); } : frame[name]; }); object.toString = CallSiteToString; return object; } function wrapCallSite(frame) { if(frame.isNative()) { return frame; } // Most call sites will return the source file from getFileName(), but code // passed to eval() ending in "//# sourceURL=..." will return the source file // from getScriptNameOrSourceURL() instead var source = frame.getFileName() || frame.getScriptNameOrSourceURL(); if (source) { var line = frame.getLineNumber(); var column = frame.getColumnNumber() - 1; // Fix position in Node where some (internal) code is prepended. // See https://github.com/evanw/node-source-map-support/issues/36 var headerLength = 62; if (line === 1 && column > headerLength && !isInBrowser() && !frame.isEval()) { column -= headerLength; } var position = mapSourcePosition({ source: source, line: line, column: column }); frame = cloneCallSite(frame); var originalFunctionName = frame.getFunctionName; frame.getFunctionName = function() { return position.name || originalFunctionName(); }; frame.getFileName = function() { return position.source; }; frame.getLineNumber = function() { return position.line; }; frame.getColumnNumber = function() { return position.column + 1; }; frame.getScriptNameOrSourceURL = function() { return position.source; }; return frame; } // Code called using eval() needs special handling var origin = frame.isEval() && frame.getEvalOrigin(); if (origin) { origin = mapEvalOrigin(origin); frame = cloneCallSite(frame); frame.getEvalOrigin = function() { return origin; }; return frame; } // If we get here then we were unable to change the source position return frame; } // This function is part of the V8 stack trace API, for more info see: // http://code.google.com/p/v8/wiki/JavaScriptStackTraceApi function prepareStackTrace(error, stack) { if (emptyCacheBetweenOperations) { fileContentsCache = {}; sourceMapCache = {}; } return error + stack.map(function(frame) { return '\n at ' + wrapCallSite(frame); }).join(''); } // Generate position and snippet of original source with pointer function getErrorSource(error) { var match = /\n at [^(]+ \((.*):(\d+):(\d+)\)/.exec(error.stack); if (match) { var source = match[1]; var line = +match[2]; var column = +match[3]; // Support the inline sourceContents inside the source map var contents = fileContentsCache[source]; // Support files on disk if (!contents && fs && fs.existsSync(source)) { try { contents = fs.readFileSync(source, 'utf8'); } catch (er) { contents = ''; } } // Format the line from the original source code like node does if (contents) { var code = contents.split(/(?:\r\n|\r|\n)/)[line - 1]; if (code) { return source + ':' + line + '\n' + code + '\n' + new Array(column).join(' ') + '^'; } } } return null; } function printErrorAndExit (error) { var source = getErrorSource(error); // Ensure error is printed synchronously and not truncated if (process.stderr._handle && process.stderr._handle.setBlocking) { process.stderr._handle.setBlocking(true); } if (source) { console.error(); console.error(source); } console.error(error.stack); process.exit(1); } function shimEmitUncaughtException () { var origEmit = process.emit; process.emit = function (type) { if (type === 'uncaughtException') { var hasStack = (arguments[1] && arguments[1].stack); var hasListeners = (this.listeners(type).length > 0); if (hasStack && !hasListeners) { return printErrorAndExit(arguments[1]); } } return origEmit.apply(this, arguments); }; } var originalRetrieveFileHandlers = retrieveFileHandlers.slice(0); var originalRetrieveMapHandlers = retrieveMapHandlers.slice(0); exports.wrapCallSite = wrapCallSite; exports.getErrorSource = getErrorSource; exports.mapSourcePosition = mapSourcePosition; exports.retrieveSourceMap = retrieveSourceMap; exports.install = function(options) { options = options || {}; if (options.environment) { environment = options.environment; if (["node", "browser", "auto"].indexOf(environment) === -1) { throw new Error("environment " + environment + " was unknown. Available options are {auto, browser, node}") } } // Allow sources to be found by methods other than reading the files // directly from disk. if (options.retrieveFile) { if (options.overrideRetrieveFile) { retrieveFileHandlers.length = 0; } retrieveFileHandlers.unshift(options.retrieveFile); } // Allow source maps to be found by methods other than reading the files // directly from disk. if (options.retrieveSourceMap) { if (options.overrideRetrieveSourceMap) { retrieveMapHandlers.length = 0; } retrieveMapHandlers.unshift(options.retrieveSourceMap); } // Support runtime transpilers that include inline source maps if (options.hookRequire && !isInBrowser()) { var Module; try { Module = require('module'); } catch (err) { // NOP: Loading in catch block to convert webpack error to warning. } var $compile = Module.prototype._compile; if (!$compile.__sourceMapSupport) { Module.prototype._compile = function(content, filename) { fileContentsCache[filename] = content; sourceMapCache[filename] = undefined; return $compile.call(this, content, filename); }; Module.prototype._compile.__sourceMapSupport = true; } } // Configure options if (!emptyCacheBetweenOperations) { emptyCacheBetweenOperations = 'emptyCacheBetweenOperations' in options ? options.emptyCacheBetweenOperations : false; } // Install the error reformatter if (!errorFormatterInstalled) { errorFormatterInstalled = true; Error.prepareStackTrace = prepareStackTrace; } if (!uncaughtShimInstalled) { var installHandler = 'handleUncaughtExceptions' in options ? options.handleUncaughtExceptions : true; // Provide the option to not install the uncaught exception handler. This is // to support other uncaught exception handlers (in test frameworks, for // example). If this handler is not installed and there are no other uncaught // exception handlers, uncaught exceptions will be caught by node's built-in // exception handler and the process will still be terminated. However, the // generated JavaScript code will be shown above the stack trace instead of // the original source code. if (installHandler && hasGlobalProcessEventEmitter()) { uncaughtShimInstalled = true; shimEmitUncaughtException(); } } }; exports.resetRetrieveHandlers = function() { retrieveFileHandlers.length = 0; retrieveMapHandlers.length = 0; retrieveFileHandlers = originalRetrieveFileHandlers.slice(0); retrieveMapHandlers = originalRetrieveMapHandlers.slice(0); }