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/usr/share/highlight/langDefs/js.lang is in highlight-common 3.8-2.

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The actual contents of the file can be viewed below.

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Description="Javascript"

Keywords={
  { Id=1,
    List={"abstract", "break", "class", "const", "continue", "debugger",
"default", "delete", "enum", "export", "extends", "finally",
"instanceof", "import", "implements", "in", "goto", "native", "package",
"private", "protected", "public", "super", "throw", "throws",
"transient", "typeof", "void", "false", "with", "for", "this", "switch", "try",
"while", "if", "do", "else", "return", "null", "case", "catch", "true", "new",
"prototype", "var", "function", "namespace","use", "internal", "interface",
"yields", "let"
    },
  },
  { Id=2,
    List={"boolean", "byte", "char", "double", "float", "int", "long", "short",
"static", "decimal", "enum", "sbyte", "uint", "ulong", "ushort", "void"},
  },
    { Id=3,
    Regex=[[ \[\w+\] ]],
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]],
  },
}

Strings={
  Delimiter=[["|']],
}

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[\/\/]] },
  },
  { Block=true,
    Nested=false,
    Delimiter= { [[\/\*]],[[\*\/]],}
  }
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|\<|\>|\!|\=|\/|\*|\%|\+|\-|\.]]