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');
/**
* Requires a module which is protected against bundler minification.
*
* @param {NodeModule} mod
* @param {string} request
*/
function dynamicRequire(mod, request) {
return mod.require(request);
}
// 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 globalProcessVersion() {
if ((typeof process === 'object') && (process !== null)) {
return process.version;
} else {
return '';
}
}
function globalProcessStderr() {
if ((typeof process === 'object') && (process !== null)) {
return process.stderr;
}
}
function globalProcessExit(code) {
if ((typeof process === 'object') && (process !== null) && (typeof process.exit === 'function')) {
return process.exit(code);
}
}
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 = /(?:\/\/[@#][\s]*sourceMappingURL=([^\s'"]+)[\s]*$)|(?:\/\*[@#][\s]*sourceMappingURL=([^\s*'"]+)[\s]*(?:\*\/)[\s]*$)/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 && typeof sourceMap.map.originalPositionFor === 'function') {
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 += "<anonymous>";
}
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 || "<anonymous>");
}
} else if (isConstructor) {
line += "new " + (functionName || "<anonymous>");
} 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, state) {
// provides interface backward compatibility
if (state === undefined) {
state = { nextPosition: null, curPosition: null }
}
if(frame.isNative()) {
state.curPosition = null;
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
// Header removed in node at ^10.16 || >=11.11.0
// v11 is not an LTS candidate, we can just test the one version with it.
// Test node versions for: 10.16-19, 10.20+, 12-19, 20-99, 100+, or 11.11
var noHeader = /^v(10\.1[6-9]|10\.[2-9][0-9]|10\.[0-9]{3,}|1[2-9]\d*|[2-9]\d|\d{3,}|11\.11)/;
var headerLength = noHeader.test(globalProcessVersion()) ? 0 : 62;
if (line === 1 && column > headerLength && !isInBrowser() && !frame.isEval()) {
column -= headerLength;
}
var position = mapSourcePosition({
source: source,
line: line,
column: column
});
state.curPosition = position;
frame = cloneCallSite(frame);
var originalFunctionName = frame.getFunctionName;
frame.getFunctionName = function() {
if (state.nextPosition == null) {
return originalFunctionName();
}
return state.nextPosition.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:
// https://v8.dev/docs/stack-trace-api
function prepareStackTrace(error, stack) {
if (emptyCacheBetweenOperations) {
fileContentsCache = {};
sourceMapCache = {};
}
var name = error.name || 'Error';
var message = error.message || '';
var errorString = name + ": " + message;
var state = { nextPosition: null, curPosition: null };
var processedStack = [];
for (var i = stack.length - 1; i >= 0; i--) {
processedStack.push('\n at ' + wrapCallSite(stack[i], state));
state.nextPosition = state.curPosition;
}
state.curPosition = state.nextPosition = null;
return errorString + processedStack.reverse().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
var stderr = globalProcessStderr();
if (stderr && stderr._handle && stderr._handle.setBlocking) {
stderr._handle.setBlocking(true);
}
if (source) {
console.error();
console.error(source);
}
console.error(error.stack);
globalProcessExit(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()) {
// Use dynamicRequire to avoid including in browser bundles
var Module = dynamicRequire(module, 'module');
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;
// Do not override 'uncaughtException' with our own handler in Node.js
// Worker threads. Workers pass the error to the main thread as an event,
// rather than printing something to stderr and exiting.
try {
// We need to use `dynamicRequire` because `require` on it's own will be optimized by WebPack/Browserify.
var worker_threads = dynamicRequire(module, 'worker_threads');
if (worker_threads.isMainThread === false) {
installHandler = false;
}
} catch(e) {}
// 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);
retrieveSourceMap = handlerExec(retrieveMapHandlers);
retrieveFile = handlerExec(retrieveFileHandlers);
}