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diff --git a/app/assets/javascripts/vue_shared/components/source_viewer/constants.js b/app/assets/javascripts/vue_shared/components/source_viewer/constants.js
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+// Language map from Rouge::Lexer to highlight.js
+// Rouge::Lexer - We use it on the BE to determine the language of a source file (https://github.com/rouge-ruby/rouge/blob/master/docs/Languages.md).
+// Highlight.js - We use it on the FE to highlight the syntax of a source file (https://github.com/highlightjs/highlight.js/tree/main/src/languages).
+export const ROUGE_TO_HLJS_LANGUAGE_MAP = {
+  bsl: '1c',
+  actionscript: 'actionscript',
+  ada: 'ada',
+  apache: 'apache',
+  applescript: 'applescript',
+  armasm: 'armasm',
+  awk: 'awk',
+  c: 'c',
+  ceylon: 'ceylon',
+  clean: 'clean',
+  clojure: 'clojure',
+  cmake: 'cmake',
+  coffeescript: 'coffeescript',
+  coq: 'coq',
+  cpp: 'cpp',
+  crystal: 'crystal',
+  csharp: 'csharp',
+  css: 'css',
+  d: 'd',
+  dart: 'dart',
+  pascal: 'delphi',
+  diff: 'diff',
+  jinja: 'django',
+  docker: 'dockerfile',
+  batchfile: 'dos',
+  elixir: 'elixir',
+  elm: 'elm',
+  erb: 'erb',
+  erlang: 'erlang',
+  fortran: 'fortran',
+  fsharp: 'fsharp',
+  gherkin: 'gherkin',
+  glsl: 'glsl',
+  go: 'go',
+  gradle: 'gradle',
+  groovy: 'groovy',
+  haml: 'haml',
+  handlebars: 'handlebars',
+  haskell: 'haskell',
+  haxe: 'haxe',
+  http: 'http',
+  hylang: 'hy',
+  ini: 'ini',
+  isbl: 'isbl',
+  java: 'java',
+  javascript: 'javascript',
+  json: 'json',
+  julia: 'julia',
+  kotlin: 'kotlin',
+  lasso: 'lasso',
+  tex: 'latex',
+  common_lisp: 'lisp',
+  livescript: 'livescript',
+  llvm: 'llvm',
+  hlsl: 'lsl',
+  lua: 'lua',
+  make: 'makefile',
+  markdown: 'markdown',
+  mathematica: 'mathematica',
+  matlab: 'matlab',
+  moonscript: 'moonscript',
+  nginx: 'nginx',
+  nim: 'nim',
+  nix: 'nix',
+  objective_c: 'objectivec',
+  ocaml: 'ocaml',
+  perl: 'perl',
+  php: 'php',
+  plaintext: 'plaintext',
+  pony: 'pony',
+  powershell: 'powershell',
+  prolog: 'prolog',
+  properties: 'properties',
+  protobuf: 'protobuf',
+  puppet: 'puppet',
+  python: 'python',
+  q: 'q',
+  qml: 'qml',
+  r: 'r',
+  reasonml: 'reasonml',
+  ruby: 'ruby',
+  rust: 'rust',
+  sas: 'sas',
+  scala: 'scala',
+  scheme: 'scheme',
+  scss: 'scss',
+  shell: 'shell',
+  smalltalk: 'smalltalk',
+  sml: 'sml',
+  sqf: 'sqf',
+  sql: 'sql',
+  stan: 'stan',
+  stata: 'stata',
+  swift: 'swift',
+  tap: 'tap',
+  tcl: 'tcl',
+  twig: 'twig',
+  typescript: 'typescript',
+  vala: 'vala',
+  vb: 'vbnet',
+  verilog: 'verilog',
+  vhdl: 'vhdl',
+  viml: 'vim',
+  xml: 'xml',
+  xquery: 'xquery',
+  yaml: 'yaml',
+};