Prism.languages.javascript = Prism.languages.extend('clike', {
    'class-name': [
        Prism.languages.clike['class-name'],
        {
            pattern: /(^|[^$\w\xA0-\uFFFF])[_$A-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\.(?:prototype|constructor))/,
            lookbehind: true
        }
    ],
    'keyword': [
        {
            pattern: /((?:^|})\s*)(?:catch|finally)\b/,
            lookbehind: true
        },
        {
            pattern: /(^|[^.]|\.\.\.\s*)\b(?:as|async(?=\s*(?:function\b|\(|[$\w\xA0-\uFFFF]|$))|await|break|case|class|const|continue|debugger|default|delete|do|else|enum|export|extends|for|from|function|get|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|set|static|super|switch|this|throw|try|typeof|undefined|var|void|while|with|yield)\b/,
            lookbehind: true
        },
    ],
    'number': /\b(?:(?:0[xX](?:[\dA-Fa-f](?:_[\dA-Fa-f])?)+|0[bB](?:[01](?:_[01])?)+|0[oO](?:[0-7](?:_[0-7])?)+)n?|(?:\d(?:_\d)?)+n|NaN|Infinity)\b|(?:\b(?:\d(?:_\d)?)+\.?(?:\d(?:_\d)?)*|\B\.(?:\d(?:_\d)?)+)(?:[Ee][+-]?(?:\d(?:_\d)?)+)?/,
    // Allow for all non-ASCII characters (See http://stackoverflow.com/a/2008444)
    'function': /#?[_$a-zA-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*(?:\.\s*(?:apply|bind|call)\s*)?\()/,
    'operator': /--|\+\+|\*\*=?|=>|&&|\|\||[!=]==|<<=?|>>>?=?|[-+*/%&|^!=<>]=?|\.{3}|\?[.?]?|[~:]/
});

Prism.languages.javascript['class-name'][0].pattern = /(\b(?:class|interface|extends|implements|instanceof|new)\s+)[\w.\\]+/;

Prism.languages.insertBefore('javascript', 'keyword', {
    'regex': {
        pattern: /((?:^|[^$\w\xA0-\uFFFF."'\])\s])\s*)\/(?:\[(?:[^\]\\\r\n]|\\.)*]|\\.|[^/\\\[\r\n])+\/[gimyus]{0,6}(?=(?:\s|\/\*[\s\S]*?\*\/)*(?:$|[\r\n,.;:})\]]|\/\/))/,
        lookbehind: true,
        greedy: true
    },
    // This must be declared before keyword because we use "function" inside the look-forward
    'function-variable': {
        pattern: /#?[_$a-zA-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*[=:]\s*(?:async\s*)?(?:\bfunction\b|(?:\((?:[^()]|\([^()]*\))*\)|[_$a-zA-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*)\s*=>))/,
        alias: 'function'
    },
    'parameter': [
        {
            pattern: /(function(?:\s+[_$A-Za-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*)?\s*\(\s*)(?!\s)(?:[^()]|\([^()]*\))+?(?=\s*\))/,
            lookbehind: true,
            inside: Prism.languages.javascript
        },
        {
            pattern: /[_$a-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*=>)/i,
            inside: Prism.languages.javascript
        },
        {
            pattern: /(\(\s*)(?!\s)(?:[^()]|\([^()]*\))+?(?=\s*\)\s*=>)/,
            lookbehind: true,
            inside: Prism.languages.javascript
        },
        {
            pattern: /((?:\b|\s|^)(?!(?:as|async|await|break|case|catch|class|const|continue|debugger|default|delete|do|else|enum|export|extends|finally|for|from|function|get|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|set|static|super|switch|this|throw|try|typeof|undefined|var|void|while|with|yield)(?![$\w\xA0-\uFFFF]))(?:[_$A-Za-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*\s*)\(\s*)(?!\s)(?:[^()]|\([^()]*\))+?(?=\s*\)\s*\{)/,
            lookbehind: true,
            inside: Prism.languages.javascript
        }
    ],
    'constant': /\b[A-Z](?:[A-Z_]|\dx?)*\b/
});

Prism.languages.insertBefore('javascript', 'string', {
    'template-string': {
        pattern: /`(?:\\[\s\S]|\${(?:[^{}]|{(?:[^{}]|{[^}]*})*})+}|(?!\${)[^\\`])*`/,
        greedy: true,
        inside: {
            'template-punctuation': {
                pattern: /^`|`$/,
                alias: 'string'
            },
            'interpolation': {
                pattern: /((?:^|[^\\])(?:\\{2})*)\${(?:[^{}]|{(?:[^{}]|{[^}]*})*})+}/,
                lookbehind: true,
                inside: {
                    'interpolation-punctuation': {
                        pattern: /^\${|}$/,
                        alias: 'punctuation'
                    },
                    rest: Prism.languages.javascript
                }
            },
            'string': /[\s\S]+/
        }
    }
});

if (Prism.languages.markup) {
    Prism.languages.markup.tag.addInlined('script', 'javascript');
}

Prism.languages.js = Prism.languages.javascript;