function javascript(Prism) {
  Prism.languages.javascript = Prism.languages.extend('clike', {
    'class-name': [
      Prism.languages.clike['class-name'],
      {
        pattern:
          /(^|[^$\w\xA0-\uFFFF])(?!\s)[_$A-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*(?=\.(?:constructor|prototype))/,
        lookbehind: true
      }
    ],
    keyword: [
      {
        pattern: /((?:^|\})\s*)catch\b/,
        lookbehind: true
      },
      {
        pattern:
          /(^|[^.]|\.\.\.\s*)\b(?:as|assert(?=\s*\{)|async(?=\s*(?:function\b|\(|[$\w\xA0-\uFFFF]|$))|await|break|case|class|const|continue|debugger|default|delete|do|else|enum|export|extends|finally(?=\s*(?:\{|$))|for|from(?=\s*(?:['"]|$))|function|(?:get|set)(?=\s*(?:[#\[$\w\xA0-\uFFFF]|$))|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|static|super|switch|this|throw|try|typeof|undefined|var|void|while|with|yield)\b/,
        lookbehind: true
      }
    ],
    // Allow for all non-ASCII characters (See http://stackoverflow.com/a/2008444)
    function:
      /#?(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*(?=\s*(?:\.\s*(?:apply|bind|call)\s*)?\()/,
    number: {
      pattern: RegExp(
        /(^|[^\w$])/.source +
          '(?:' + // constant
          (/NaN|Infinity/.source +
            '|' + // binary integer
            /0[bB][01]+(?:_[01]+)*n?/.source +
            '|' + // octal integer
            /0[oO][0-7]+(?:_[0-7]+)*n?/.source +
            '|' + // hexadecimal integer
            /0[xX][\dA-Fa-f]+(?:_[\dA-Fa-f]+)*n?/.source +
            '|' + // decimal bigint
            /\d+(?:_\d+)*n/.source +
            '|' + // decimal number (integer or float) but no bigint
            /(?:\d+(?:_\d+)*(?:\.(?:\d+(?:_\d+)*)?)?|\.\d+(?:_\d+)*)(?:[Ee][+-]?\d+(?:_\d+)*)?/
              .source) +
          ')' +
          /(?![\w$])/.source
      ),
      lookbehind: true
    },
    operator:
      /--|\+\+|\*\*=?|=>|&&=?|\|\|=?|[!=]==|<<=?|>>>?=?|[-+*/%&|^!=<>]=?|\.{3}|\?\?=?|\?\.?|[~:]/
  })
  Prism.languages.javascript['class-name'][0].pattern =
    /(\b(?:class|extends|implements|instanceof|interface|new)\s+)[\w.\\]+/
  Prism.languages.insertBefore('javascript', 'keyword', {
    regex: {
      // eslint-disable-next-line regexp/no-dupe-characters-character-class
      pattern:
        /((?:^|[^$\w\xA0-\uFFFF."'\])\s]|\b(?:return|yield))\s*)\/(?:\[(?:[^\]\\\r\n]|\\.)*\]|\\.|[^/\\\[\r\n])+\/[dgimyus]{0,7}(?=(?:\s|\/\*(?:[^*]|\*(?!\/))*\*\/)*(?:$|[\r\n,.;:})\]]|\/\/))/,
      lookbehind: true,
      greedy: true,
      inside: {
        'regex-source': {
          pattern: /^(\/)[\s\S]+(?=\/[a-z]*$)/,
          lookbehind: true,
          alias: 'language-regex',
          inside: Prism.languages.regex
        },
        'regex-delimiter': /^\/|\/$/,
        'regex-flags': /^[a-z]+$/
      }
    },
    // This must be declared before keyword because we use "function" inside the look-forward
    'function-variable': {
      pattern:
        /#?(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*(?=\s*[=:]\s*(?:async\s*)?(?:\bfunction\b|(?:\((?:[^()]|\([^()]*\))*\)|(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*)\s*=>))/,
      alias: 'function'
    },
    parameter: [
      {
        pattern:
          /(function(?:\s+(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*)?\s*\(\s*)(?!\s)(?:[^()\s]|\s+(?![\s)])|\([^()]*\))+(?=\s*\))/,
        lookbehind: true,
        inside: Prism.languages.javascript
      },
      {
        pattern:
          /(^|[^$\w\xA0-\uFFFF])(?!\s)[_$a-z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*(?=\s*=>)/i,
        lookbehind: true,
        inside: Prism.languages.javascript
      },
      {
        pattern:
          /(\(\s*)(?!\s)(?:[^()\s]|\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)(?![$\w\xA0-\uFFFF]))(?:(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*\s*)\(\s*|\]\s*\(\s*)(?!\s)(?:[^()\s]|\s+(?![\s)])|\([^()]*\))+(?=\s*\)\s*\{)/,
        lookbehind: true,
        inside: Prism.languages.javascript
      }
    ],
    constant: /\b[A-Z](?:[A-Z_]|\dx?)*\b/
  })
  Prism.languages.insertBefore('javascript', 'string', {
    hashbang: {
      pattern: /^#!.*/,
      greedy: true,
      alias: 'comment'
    },
    '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]+/
      }
    },
    'string-property': {
      pattern:
        /((?:^|[,{])[ \t]*)(["'])(?:\\(?:\r\n|[\s\S])|(?!\2)[^\\\r\n])*\2(?=\s*:)/m,
      lookbehind: true,
      greedy: true,
      alias: 'property'
    }
  })
  Prism.languages.insertBefore('javascript', 'operator', {
    'literal-property': {
      pattern:
        /((?:^|[,{])[ \t]*)(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*(?=\s*:)/m,
      lookbehind: true,
      alias: 'property'
    }
  })
  if (Prism.languages.markup) {
    Prism.languages.markup.tag.addInlined('script', 'javascript') // add attribute support for all DOM events.
    // https://developer.mozilla.org/en-US/docs/Web/Events#Standard_events
    Prism.languages.markup.tag.addAttribute(
      /on(?:abort|blur|change|click|composition(?:end|start|update)|dblclick|error|focus(?:in|out)?|key(?:down|up)|load|mouse(?:down|enter|leave|move|out|over|up)|reset|resize|scroll|select|slotchange|submit|unload|wheel)/
        .source,
      'javascript'
    )
  }
  Prism.languages.js = Prism.languages.javascript
}
Returns the string content of a token or token stream.

@param {string | Token | (string | Token)[]} value
@returns {string}