Prism.languages.fsharp = Prism.languages.extend('clike', {
  comment: [
    {
      pattern: /(^|[^\\])\(\*[\s\S]*?\*\)/,
      lookbehind: true,
    },
    {
      pattern: /(^|[^\\:])\/\/.*/,
      lookbehind: true,
    },
  ],
  keyword: /\b(?:let|return|use|yield)(?:!\B|\b)|\b(abstract|and|as|assert|base|begin|class|default|delegate|do|done|downcast|downto|elif|else|end|exception|extern|false|finally|for|fun|function|global|if|in|inherit|inline|interface|internal|lazy|match|member|module|mutable|namespace|new|not|null|of|open|or|override|private|public|rec|select|static|struct|then|to|true|try|type|upcast|val|void|when|while|with|asr|land|lor|lsl|lsr|lxor|mod|sig|atomic|break|checked|component|const|constraint|constructor|continue|eager|event|external|fixed|functor|include|method|mixin|object|parallel|process|protected|pure|sealed|tailcall|trait|virtual|volatile)\b/,
  string: {
    pattern: /(?:"""[\s\S]*?"""|@"(?:""|[^"])*"|("|')(?:\\[\s\S]|(?!\1)[^\\])*\1)B?/,
    greedy: true,
  },
  number: [
    /\b0x[\da-fA-F]+(?:un|lf|LF)?\b/,
    /\b0b[01]+(?:y|uy)?\b/,
    /(?:\b\d+\.?\d*|\B\.\d+)(?:[fm]|e[+-]?\d+)?\b/i,
    /\b\d+(?:[IlLsy]|u[lsy]?|UL)?\b/,
  ],
});
Prism.languages.insertBefore('fsharp', 'keyword', {
  preprocessor: {
    pattern: /^[^\r\n\S]*#.*/m,
    alias: 'property',
    inside: {
      directive: {
        pattern: /(\s*#)\b(?:else|endif|if|light|line|nowarn)\b/,
        lookbehind: true,
        alias: 'keyword',
      },
    },
  },
});
