Add runtime error overlay

packages/react-dev-utils/ansiHTML.js

@@ -0,0 +1,88 @@
+var Anser = require('anser');
+
+// Color scheme inspired by https://chriskempson.github.io/base16/css/base16-github.css
+var base00 = 'ffffff'; // Default Background
+var base01 = 'f5f5f5'; // Lighter Background (Used for status bars)
+var base02 = 'c8c8fa'; // Selection Background
+var base03 = '969896'; // Comments, Invisibles, Line Highlighting
+var base04 = 'e8e8e8'; // Dark Foreground (Used for status bars)
+var base05 = '333333'; // Default Foreground, Caret, Delimiters, Operators
+var base06 = 'ffffff'; // Light Foreground (Not often used)
+var base07 = 'ffffff'; // Light Background (Not often used)
+var base08 = 'ed6a43'; // Variables, XML Tags, Markup Link Text, Markup Lists, Diff Deleted
+var base09 = '0086b3'; // Integers, Boolean, Constants, XML Attributes, Markup Link Url
+var base0A = '795da3'; // Classes, Markup Bold, Search Text Background
+var base0B = '183691'; // Strings, Inherited Class, Markup Code, Diff Inserted
+var base0C = '183691'; // Support, Regular Expressions, Escape Characters, Markup Quotes
+var base0D = '795da3'; // Functions, Methods, Attribute IDs, Headings
+var base0E = 'a71d5d'; // Keywords, Storage, Selector, Markup Italic, Diff Changed
+var base0F = '333333'; // Deprecated, Opening/Closing Embedded Language Tags e.g. <?php ?>
+
+// Map ANSI colors from what babel-code-frame uses to base16-github
+// See: https://github.com/babel/babel/blob/e86f62b304d280d0bab52c38d61842b853848ba6/packages/babel-code-frame/src/index.js#L9-L22
+var colors = {
+  reset: [base05, 'transparent'],
+  black: base05,
+  red: base08, /* marker, bg-invalid */
+  green: base0B, /* string */
+  yellow: base08, /* capitalized, jsx_tag, punctuator */
+  blue: base0C,
+  magenta: base0C, /* regex */
+  cyan: base0E, /* keyword */
+  gray: base03, /* comment, gutter */
+  lightgrey: base01,
+  darkgrey: base03
+};
+
+var anserMap = {
+  'ansi-bright-black': 'black',
+  'ansi-bright-yellow': 'yellow',
+  'ansi-yellow': 'yellow',
+  'ansi-bright-green': 'green',
+  'ansi-green': 'green',
+  'ansi-bright-cyan': 'cyan',
+  'ansi-cyan': 'cyan',
+  'ansi-bright-red': 'red',
+  'ansi-red': 'red',
+  'ansi-bright-magenta': 'magenta',
+  'ansi-magenta': 'magenta'
+}
+
+function ansiHTML(txt) {
+  const arr = new Anser().ansiToJson(txt, {
+    use_classes: true
+  })
+
+  let result = ''
+  let open = false
+  for (let c of arr) {
+    const { content, fg } = c
+    const contentParts = content.split('\n')
+    for (let index = 0; index < contentParts.length; ++index) {
+      if (!open) {
+        result += '<span data-ansi-line="true">'
+        open = true
+      }
+      let part = contentParts[index].replace('\r', '')
+      const color = colors[anserMap[fg]]
+      if (color != null) {
+        result += `<span style="color: #${color};">${part}</span>`
+      } else {
+        if (fg != null) console.log('Missing color mapping: ', fg)
+        result += `<span>${part}</span>`
+      }
+      if (index < contentParts.length - 1) {
+        result += '</span>'
+        open = false
+        result += '<br/>'
+      }
+    }
+  }
+  if (open) {
+    result += '</span>'
+    open = false
+  }
+  return result
+}
+
+module.exports = ansiHTML;