Don’t patch Error.prepareStackTrace if --enable-source-maps is used.

Cakefile

@@ -137,7 +137,7 @@ task 'build:browser', 'merge the built scripts into a single file for use in a b
     return #{fs.readFileSync "./package.json"};
   })();
   """
-  for name in ['helpers', 'rewriter', 'lexer', 'parser', 'scope', 'nodes', 'sourcemap', 'coffeescript', 'browser']
+  for name in ['helpers', 'rewriter', 'lexer', 'parser', 'scope', 'nodes', 'sourcemap', 'stacktrace', 'coffeescript', 'browser']
     code += """
       require['./#{name}'] = (function() {
         var exports = {}, module = {exports: exports};

documentation/site/docs.coffee

@@ -14,6 +14,8 @@ window.gtag 'config', window.GA_TRACKING_ID
 
 # Initialize the CoffeeScript docs interactions
 $(document).ready ->
+  CoffeeScript.attachStackTrace()
+
   # Format dates for the user’s locale, e.g. 'December 24, 2009' or '24 décembre 2009'
   $('time').each (index, el) ->
     date = el.dateTime or $(el).text()
@@ -105,7 +107,7 @@ $(document).ready ->
                 if window.localStorage?
                   window.localStorage.setItem 'tryCoffeeScriptCode', coffee
               catch exception
-            output = CoffeeScript.compile coffee, bare: yes
+            output = CoffeeScript.compile coffee, bare: yes, inlineMap: true
             lastCompilationElapsedTime = Math.max(200, Date.now() - lastCompilationStartTime)
           catch exception
             output = "#{exception}"

src/coffeescript.coffee

@@ -22,6 +22,8 @@ exports.helpers = helpers
 {registerCompiled} = SourceMap
 exports.registerCompiled = registerCompiled
 
+exports.attachStackTrace = require('./stacktrace').attach
+
 # Function that allows for btoa in both nodejs and the browser.
 base64encode = (src) -> switch
   when typeof Buffer is 'function'
@@ -60,7 +62,7 @@ exports.compile = compile = withPrettyErrors (code, options = {}) ->
   # Clone `options`, to avoid mutating the `options` object passed in.
   options = Object.assign {}, options
 
-  generateSourceMap = options.sourceMap or options.inlineMap
+  generateSourceMap = options.sourceMap or options.inlineMap or not options.filename?
   filename = options.filename or helpers.anonymousFileName()
 
   checkShebangLine filename, code
@@ -162,7 +164,7 @@ exports.compile = compile = withPrettyErrors (code, options = {}) ->
   if options.inlineMap
     encoded = base64encode JSON.stringify v3SourceMap
     sourceMapDataURI = "//# sourceMappingURL=data:application/json;base64,#{encoded}"
-    sourceURL = "//# sourceURL=#{options.filename ? 'coffeescript'}"
+    sourceURL = "//# sourceURL=#{filename}"
     js = "#{js}\n#{sourceMapDataURI}\n#{sourceURL}"
 
   registerCompiled filename, code, map

src/register.coffee

@@ -3,85 +3,17 @@ child_process = require 'child_process'
 helpers       = require './helpers'
 path          = require 'path'
 
-{ getSourceMap } = require "./sourcemap"
+stacktrace = require './stacktrace'
 
 # Check if Node's built-in source map stack trace transformations are enabled.
-nodeSourceMapsSupportEnabled =
+nodeSourceMapsSupportEnabled = process? and (
   process.execArgv.includes('--enable-source-maps') or
   process.env.NODE_OPTIONS?.includes('--enable-source-maps')
+)
 
 unless Error.prepareStackTrace or nodeSourceMapsSupportEnabled
   cacheSourceMaps = true
-
-  # Based on http://v8.googlecode.com/svn/branches/bleeding_edge/src/messages.js
-  # Modified to handle sourceMap
-  formatSourcePosition = (frame, getSourceMapping) ->
-    filename = undefined
-    fileLocation = ''
-
-    if frame.isNative()
-      fileLocation = "native"
-    else
-      if frame.isEval()
-        filename = frame.getScriptNameOrSourceURL()
-        fileLocation = "#{frame.getEvalOrigin()}, " unless filename
-      else
-        filename = frame.getFileName()
-
-      filename or= "<anonymous>"
-
-      line = frame.getLineNumber()
-      column = frame.getColumnNumber()
-
-      # Check for a sourceMap position
-      source = getSourceMapping filename, line, column
-      fileLocation =
-        if source
-          "#{filename}:#{source[0]}:#{source[1]}"
-        else
-          "#{filename}:#{line}:#{column}"
-
-    functionName = frame.getFunctionName()
-    isConstructor = frame.isConstructor()
-    isMethodCall = not (frame.isToplevel() or isConstructor)
-
-    if isMethodCall
-      methodName = frame.getMethodName()
-      typeName = frame.getTypeName()
-
-      if functionName
-        tp = as = ''
-        if typeName and functionName.indexOf typeName
-          tp = "#{typeName}."
-        if methodName and functionName.indexOf(".#{methodName}") isnt functionName.length - methodName.length - 1
-          as = " [as #{methodName}]"
-
-        "#{tp}#{functionName}#{as} (#{fileLocation})"
-      else
-        "#{typeName}.#{methodName or '<anonymous>'} (#{fileLocation})"
-    else if isConstructor
-      "new #{functionName or '<anonymous>'} (#{fileLocation})"
-    else if functionName
-      "#{functionName} (#{fileLocation})"
-    else
-      fileLocation
-
-  # Based on [michaelficarra/CoffeeScriptRedux](http://goo.gl/ZTx1p)
-  # NodeJS / V8 have no support for transforming positions in stack traces using
-  # sourceMap, so we must monkey-patch Error to display CoffeeScript source
-  # positions.
-  Error.prepareStackTrace = (err, stack) ->
-    getSourceMapping = (filename, line, column) ->
-      sourceMap = getSourceMap filename, line, column
-
-      answer = sourceMap.sourceLocation [line - 1, column - 1] if sourceMap?
-      if answer? then [answer[0] + 1, answer[1] + 1] else null
-
-    frames = for frame in stack
-      break if frame.getFunction() is exports.run
-      "    at #{formatSourcePosition frame, getSourceMapping}"
-
-    "#{err.toString()}\n#{frames.join '\n'}\n"
+  stacktrace.attach(CoffeeScript.run)
 
 # Load and run a CoffeeScript file for Node, stripping any `BOM`s.
 loadFile = (module, filename) ->