    #! shebang
    #! no-shebang

    /* comment */

    function fun()
    {
        var boo = { 'key': [ 1, 2.0, 3.0e1, 004, 0x5 ] };
    }

    class MyClass; // reserved keywords

    // Member objects: text after "."
    object.property instanceof Number;
    iden1.iden2  . iden3.class class;

    var escapes = "aa\b\n\0a\"a\x12a\32a\u{123}a\$\%\ \#\y\aaa\
    aaa";
    var octal = 0o124;
    var bin = 0b1010;

    日本語().ლಠ益ಠლ.ñá = 42;
    δ /No-Regex/

    // Only highlight valid regular expressions, of a single line, after strings
    // See: https://github.com/microsoft/TypeScript-TmLanguage/issues/786
    "text" /No-Regex
    "text" /Regex[:)]*/;
    const a = "6" / 2; /*comment*/ const b = 5;
    console.log("4" / "2"); // 2
    // Single quote
    const a = '6' / 2; /*comment*/ const b = 5;
    console.log('4' / '2'); // 2
    // Template
    const a = `6` / 2; /*comment*/ const b = 5;
    console.log(`4` / `2`); // 2

    // Built-in
    const os = require('os');
    JSON.stringify("hello");
    console.error("hello");
    Math.LOG10E;
    Number.MAX_SAFE_INTEGER;