--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/highlight/es/languages/typescript.js	Tue Jan 13 19:18:47 2026 -0800
@@ -0,0 +1,921 @@
+/*! `typescript` grammar compiled for Highlight.js 11.11.1 */
+var hljsGrammar = (function () {
+  'use strict';
+
+  const IDENT_RE = '[A-Za-z$_][0-9A-Za-z$_]*';
+  const KEYWORDS = [
+    "as", // for exports
+    "in",
+    "of",
+    "if",
+    "for",
+    "while",
+    "finally",
+    "var",
+    "new",
+    "function",
+    "do",
+    "return",
+    "void",
+    "else",
+    "break",
+    "catch",
+    "instanceof",
+    "with",
+    "throw",
+    "case",
+    "default",
+    "try",
+    "switch",
+    "continue",
+    "typeof",
+    "delete",
+    "let",
+    "yield",
+    "const",
+    "class",
+    // JS handles these with a special rule
+    // "get",
+    // "set",
+    "debugger",
+    "async",
+    "await",
+    "static",
+    "import",
+    "from",
+    "export",
+    "extends",
+    // It's reached stage 3, which is "recommended for implementation":
+    "using"
+  ];
+  const LITERALS = [
+    "true",
+    "false",
+    "null",
+    "undefined",
+    "NaN",
+    "Infinity"
+  ];
+
+  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects
+  const TYPES = [
+    // Fundamental objects
+    "Object",
+    "Function",
+    "Boolean",
+    "Symbol",
+    // numbers and dates
+    "Math",
+    "Date",
+    "Number",
+    "BigInt",
+    // text
+    "String",
+    "RegExp",
+    // Indexed collections
+    "Array",
+    "Float32Array",
+    "Float64Array",
+    "Int8Array",
+    "Uint8Array",
+    "Uint8ClampedArray",
+    "Int16Array",
+    "Int32Array",
+    "Uint16Array",
+    "Uint32Array",
+    "BigInt64Array",
+    "BigUint64Array",
+    // Keyed collections
+    "Set",
+    "Map",
+    "WeakSet",
+    "WeakMap",
+    // Structured data
+    "ArrayBuffer",
+    "SharedArrayBuffer",
+    "Atomics",
+    "DataView",
+    "JSON",
+    // Control abstraction objects
+    "Promise",
+    "Generator",
+    "GeneratorFunction",
+    "AsyncFunction",
+    // Reflection
+    "Reflect",
+    "Proxy",
+    // Internationalization
+    "Intl",
+    // WebAssembly
+    "WebAssembly"
+  ];
+
+  const ERROR_TYPES = [
+    "Error",
+    "EvalError",
+    "InternalError",
+    "RangeError",
+    "ReferenceError",
+    "SyntaxError",
+    "TypeError",
+    "URIError"
+  ];
+
+  const BUILT_IN_GLOBALS = [
+    "setInterval",
+    "setTimeout",
+    "clearInterval",
+    "clearTimeout",
+
+    "require",
+    "exports",
+
+    "eval",
+    "isFinite",
+    "isNaN",
+    "parseFloat",
+    "parseInt",
+    "decodeURI",
+    "decodeURIComponent",
+    "encodeURI",
+    "encodeURIComponent",
+    "escape",
+    "unescape"
+  ];
+
+  const BUILT_IN_VARIABLES = [
+    "arguments",
+    "this",
+    "super",
+    "console",
+    "window",
+    "document",
+    "localStorage",
+    "sessionStorage",
+    "module",
+    "global" // Node.js
+  ];
+
+  const BUILT_INS = [].concat(
+    BUILT_IN_GLOBALS,
+    TYPES,
+    ERROR_TYPES
+  );
+
+  /*
+  Language: JavaScript
+  Description: JavaScript (JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions.
+  Category: common, scripting, web
+  Website: https://developer.mozilla.org/en-US/docs/Web/JavaScript
+  */
+
+
+  /** @type LanguageFn */
+  function javascript(hljs) {
+    const regex = hljs.regex;
+    /**
+     * Takes a string like "<Booger" and checks to see
+     * if we can find a matching "</Booger" later in the
+     * content.
+     * @param {RegExpMatchArray} match
+     * @param {{after:number}} param1
+     */
+    const hasClosingTag = (match, { after }) => {
+      const tag = "</" + match[0].slice(1);
+      const pos = match.input.indexOf(tag, after);
+      return pos !== -1;
+    };
+
+    const IDENT_RE$1 = IDENT_RE;
+    const FRAGMENT = {
+      begin: '<>',
+      end: '</>'
+    };
+    // to avoid some special cases inside isTrulyOpeningTag
+    const XML_SELF_CLOSING = /<[A-Za-z0-9\\._:-]+\s*\/>/;
+    const XML_TAG = {
+      begin: /<[A-Za-z0-9\\._:-]+/,
+      end: /\/[A-Za-z0-9\\._:-]+>|\/>/,
+      /**
+       * @param {RegExpMatchArray} match
+       * @param {CallbackResponse} response
+       */
+      isTrulyOpeningTag: (match, response) => {
+        const afterMatchIndex = match[0].length + match.index;
+        const nextChar = match.input[afterMatchIndex];
+        if (
+          // HTML should not include another raw `<` inside a tag
+          // nested type?
+          // `<Array<Array<number>>`, etc.
+          nextChar === "<" ||
+          // the , gives away that this is not HTML
+          // `<T, A extends keyof T, V>`
+          nextChar === ","
+          ) {
+          response.ignoreMatch();
+          return;
+        }
+
+        // `<something>`
+        // Quite possibly a tag, lets look for a matching closing tag...
+        if (nextChar === ">") {
+          // if we cannot find a matching closing tag, then we
+          // will ignore it
+          if (!hasClosingTag(match, { after: afterMatchIndex })) {
+            response.ignoreMatch();
+          }
+        }
+
+        // `<blah />` (self-closing)
+        // handled by simpleSelfClosing rule
+
+        let m;
+        const afterMatch = match.input.substring(afterMatchIndex);
+
+        // some more template typing stuff
+        //  <T = any>(key?: string) => Modify<
+        if ((m = afterMatch.match(/^\s*=/))) {
+          response.ignoreMatch();
+          return;
+        }
+
+        // `<From extends string>`
+        // technically this could be HTML, but it smells like a type
+        // NOTE: This is ugh, but added specifically for https://github.com/highlightjs/highlight.js/issues/3276
+        if ((m = afterMatch.match(/^\s+extends\s+/))) {
+          if (m.index === 0) {
+            response.ignoreMatch();
+            // eslint-disable-next-line no-useless-return
+            return;
+          }
+        }
+      }
+    };
+    const KEYWORDS$1 = {
+      $pattern: IDENT_RE,
+      keyword: KEYWORDS,
+      literal: LITERALS,
+      built_in: BUILT_INS,
+      "variable.language": BUILT_IN_VARIABLES
+    };
+
+    // https://tc39.es/ecma262/#sec-literals-numeric-literals
+    const decimalDigits = '[0-9](_?[0-9])*';
+    const frac = `\\.(${decimalDigits})`;
+    // DecimalIntegerLiteral, including Annex B NonOctalDecimalIntegerLiteral
+    // https://tc39.es/ecma262/#sec-additional-syntax-numeric-literals
+    const decimalInteger = `0|[1-9](_?[0-9])*|0[0-7]*[89][0-9]*`;
+    const NUMBER = {
+      className: 'number',
+      variants: [
+        // DecimalLiteral
+        { begin: `(\\b(${decimalInteger})((${frac})|\\.)?|(${frac}))` +
+          `[eE][+-]?(${decimalDigits})\\b` },
+        { begin: `\\b(${decimalInteger})\\b((${frac})\\b|\\.)?|(${frac})\\b` },
+
+        // DecimalBigIntegerLiteral
+        { begin: `\\b(0|[1-9](_?[0-9])*)n\\b` },
+
+        // NonDecimalIntegerLiteral
+        { begin: "\\b0[xX][0-9a-fA-F](_?[0-9a-fA-F])*n?\\b" },
+        { begin: "\\b0[bB][0-1](_?[0-1])*n?\\b" },
+        { begin: "\\b0[oO][0-7](_?[0-7])*n?\\b" },
+
+        // LegacyOctalIntegerLiteral (does not include underscore separators)
+        // https://tc39.es/ecma262/#sec-additional-syntax-numeric-literals
+        { begin: "\\b0[0-7]+n?\\b" },
+      ],
+      relevance: 0
+    };
+
+    const SUBST = {
+      className: 'subst',
+      begin: '\\$\\{',
+      end: '\\}',
+      keywords: KEYWORDS$1,
+      contains: [] // defined later
+    };
+    const HTML_TEMPLATE = {
+      begin: '\.?html`',
+      end: '',
+      starts: {
+        end: '`',
+        returnEnd: false,
+        contains: [
+          hljs.BACKSLASH_ESCAPE,
+          SUBST
+        ],
+        subLanguage: 'xml'
+      }
+    };
+    const CSS_TEMPLATE = {
+      begin: '\.?css`',
+      end: '',
+      starts: {
+        end: '`',
+        returnEnd: false,
+        contains: [
+          hljs.BACKSLASH_ESCAPE,
+          SUBST
+        ],
+        subLanguage: 'css'
+      }
+    };
+    const GRAPHQL_TEMPLATE = {
+      begin: '\.?gql`',
+      end: '',
+      starts: {
+        end: '`',
+        returnEnd: false,
+        contains: [
+          hljs.BACKSLASH_ESCAPE,
+          SUBST
+        ],
+        subLanguage: 'graphql'
+      }
+    };
+    const TEMPLATE_STRING = {
+      className: 'string',
+      begin: '`',
+      end: '`',
+      contains: [
+        hljs.BACKSLASH_ESCAPE,
+        SUBST
+      ]
+    };
+    const JSDOC_COMMENT = hljs.COMMENT(
+      /\/\*\*(?!\/)/,
+      '\\*/',
+      {
+        relevance: 0,
+        contains: [
+          {
+            begin: '(?=@[A-Za-z]+)',
+            relevance: 0,
+            contains: [
+              {
+                className: 'doctag',
+                begin: '@[A-Za-z]+'
+              },
+              {
+                className: 'type',
+                begin: '\\{',
+                end: '\\}',
+                excludeEnd: true,
+                excludeBegin: true,
+                relevance: 0
+              },
+              {
+                className: 'variable',
+                begin: IDENT_RE$1 + '(?=\\s*(-)|$)',
+                endsParent: true,
+                relevance: 0
+              },
+              // eat spaces (not newlines) so we can find
+              // types or variables
+              {
+                begin: /(?=[^\n])\s/,
+                relevance: 0
+              }
+            ]
+          }
+        ]
+      }
+    );
+    const COMMENT = {
+      className: "comment",
+      variants: [
+        JSDOC_COMMENT,
+        hljs.C_BLOCK_COMMENT_MODE,
+        hljs.C_LINE_COMMENT_MODE
+      ]
+    };
+    const SUBST_INTERNALS = [
+      hljs.APOS_STRING_MODE,
+      hljs.QUOTE_STRING_MODE,
+      HTML_TEMPLATE,
+      CSS_TEMPLATE,
+      GRAPHQL_TEMPLATE,
+      TEMPLATE_STRING,
+      // Skip numbers when they are part of a variable name
+      { match: /\$\d+/ },
+      NUMBER,
+      // This is intentional:
+      // See https://github.com/highlightjs/highlight.js/issues/3288
+      // hljs.REGEXP_MODE
+    ];
+    SUBST.contains = SUBST_INTERNALS
+      .concat({
+        // we need to pair up {} inside our subst to prevent
+        // it from ending too early by matching another }
+        begin: /\{/,
+        end: /\}/,
+        keywords: KEYWORDS$1,
+        contains: [
+          "self"
+        ].concat(SUBST_INTERNALS)
+      });
+    const SUBST_AND_COMMENTS = [].concat(COMMENT, SUBST.contains);
+    const PARAMS_CONTAINS = SUBST_AND_COMMENTS.concat([
+      // eat recursive parens in sub expressions
+      {
+        begin: /(\s*)\(/,
+        end: /\)/,
+        keywords: KEYWORDS$1,
+        contains: ["self"].concat(SUBST_AND_COMMENTS)
+      }
+    ]);
+    const PARAMS = {
+      className: 'params',
+      // convert this to negative lookbehind in v12
+      begin: /(\s*)\(/, // to match the parms with
+      end: /\)/,
+      excludeBegin: true,
+      excludeEnd: true,
+      keywords: KEYWORDS$1,
+      contains: PARAMS_CONTAINS
+    };
+
+    // ES6 classes
+    const CLASS_OR_EXTENDS = {
+      variants: [
+        // class Car extends vehicle
+        {
+          match: [
+            /class/,
+            /\s+/,
+            IDENT_RE$1,
+            /\s+/,
+            /extends/,
+            /\s+/,
+            regex.concat(IDENT_RE$1, "(", regex.concat(/\./, IDENT_RE$1), ")*")
+          ],
+          scope: {
+            1: "keyword",
+            3: "title.class",
+            5: "keyword",
+            7: "title.class.inherited"
+          }
+        },
+        // class Car
+        {
+          match: [
+            /class/,
+            /\s+/,
+            IDENT_RE$1
+          ],
+          scope: {
+            1: "keyword",
+            3: "title.class"
+          }
+        },
+
+      ]
+    };
+
+    const CLASS_REFERENCE = {
+      relevance: 0,
+      match:
+      regex.either(
+        // Hard coded exceptions
+        /\bJSON/,
+        // Float32Array, OutT
+        /\b[A-Z][a-z]+([A-Z][a-z]*|\d)*/,
+        // CSSFactory, CSSFactoryT
+        /\b[A-Z]{2,}([A-Z][a-z]+|\d)+([A-Z][a-z]*)*/,
+        // FPs, FPsT
+        /\b[A-Z]{2,}[a-z]+([A-Z][a-z]+|\d)*([A-Z][a-z]*)*/,
+        // P
+        // single letters are not highlighted
+        // BLAH
+        // this will be flagged as a UPPER_CASE_CONSTANT instead
+      ),
+      className: "title.class",
+      keywords: {
+        _: [
+          // se we still get relevance credit for JS library classes
+          ...TYPES,
+          ...ERROR_TYPES
+        ]
+      }
+    };
+
+    const USE_STRICT = {
+      label: "use_strict",
+      className: 'meta',
+      relevance: 10,
+      begin: /^\s*['"]use (strict|asm)['"]/
+    };
+
+    const FUNCTION_DEFINITION = {
+      variants: [
+        {
+          match: [
+            /function/,
+            /\s+/,
+            IDENT_RE$1,
+            /(?=\s*\()/
+          ]
+        },
+        // anonymous function
+        {
+          match: [
+            /function/,
+            /\s*(?=\()/
+          ]
+        }
+      ],
+      className: {
+        1: "keyword",
+        3: "title.function"
+      },
+      label: "func.def",
+      contains: [ PARAMS ],
+      illegal: /%/
+    };
+
+    const UPPER_CASE_CONSTANT = {
+      relevance: 0,
+      match: /\b[A-Z][A-Z_0-9]+\b/,
+      className: "variable.constant"
+    };
+
+    function noneOf(list) {
+      return regex.concat("(?!", list.join("|"), ")");
+    }
+
+    const FUNCTION_CALL = {
+      match: regex.concat(
+        /\b/,
+        noneOf([
+          ...BUILT_IN_GLOBALS,
+          "super",
+          "import"
+        ].map(x => `${x}\\s*\\(`)),
+        IDENT_RE$1, regex.lookahead(/\s*\(/)),
+      className: "title.function",
+      relevance: 0
+    };
+
+    const PROPERTY_ACCESS = {
+      begin: regex.concat(/\./, regex.lookahead(
+        regex.concat(IDENT_RE$1, /(?![0-9A-Za-z$_(])/)
+      )),
+      end: IDENT_RE$1,
+      excludeBegin: true,
+      keywords: "prototype",
+      className: "property",
+      relevance: 0
+    };
+
+    const GETTER_OR_SETTER = {
+      match: [
+        /get|set/,
+        /\s+/,
+        IDENT_RE$1,
+        /(?=\()/
+      ],
+      className: {
+        1: "keyword",
+        3: "title.function"
+      },
+      contains: [
+        { // eat to avoid empty params
+          begin: /\(\)/
+        },
+        PARAMS
+      ]
+    };
+
+    const FUNC_LEAD_IN_RE = '(\\(' +
+      '[^()]*(\\(' +
+      '[^()]*(\\(' +
+      '[^()]*' +
+      '\\)[^()]*)*' +
+      '\\)[^()]*)*' +
+      '\\)|' + hljs.UNDERSCORE_IDENT_RE + ')\\s*=>';
+
+    const FUNCTION_VARIABLE = {
+      match: [
+        /const|var|let/, /\s+/,
+        IDENT_RE$1, /\s*/,
+        /=\s*/,
+        /(async\s*)?/, // async is optional
+        regex.lookahead(FUNC_LEAD_IN_RE)
+      ],
+      keywords: "async",
+      className: {
+        1: "keyword",
+        3: "title.function"
+      },
+      contains: [
+        PARAMS
+      ]
+    };
+
+    return {
+      name: 'JavaScript',
+      aliases: ['js', 'jsx', 'mjs', 'cjs'],
+      keywords: KEYWORDS$1,
+      // this will be extended by TypeScript
+      exports: { PARAMS_CONTAINS, CLASS_REFERENCE },
+      illegal: /#(?![$_A-z])/,
+      contains: [
+        hljs.SHEBANG({
+          label: "shebang",
+          binary: "node",
+          relevance: 5
+        }),
+        USE_STRICT,
+        hljs.APOS_STRING_MODE,
+        hljs.QUOTE_STRING_MODE,
+        HTML_TEMPLATE,
+        CSS_TEMPLATE,
+        GRAPHQL_TEMPLATE,
+        TEMPLATE_STRING,
+        COMMENT,
+        // Skip numbers when they are part of a variable name
+        { match: /\$\d+/ },
+        NUMBER,
+        CLASS_REFERENCE,
+        {
+          scope: 'attr',
+          match: IDENT_RE$1 + regex.lookahead(':'),
+          relevance: 0
+        },
+        FUNCTION_VARIABLE,
+        { // "value" container
+          begin: '(' + hljs.RE_STARTERS_RE + '|\\b(case|return|throw)\\b)\\s*',
+          keywords: 'return throw case',
+          relevance: 0,
+          contains: [
+            COMMENT,
+            hljs.REGEXP_MODE,
+            {
+              className: 'function',
+              // we have to count the parens to make sure we actually have the
+              // correct bounding ( ) before the =>.  There could be any number of
+              // sub-expressions inside also surrounded by parens.
+              begin: FUNC_LEAD_IN_RE,
+              returnBegin: true,
+              end: '\\s*=>',
+              contains: [
+                {
+                  className: 'params',
+                  variants: [
+                    {
+                      begin: hljs.UNDERSCORE_IDENT_RE,
+                      relevance: 0
+                    },
+                    {
+                      className: null,
+                      begin: /\(\s*\)/,
+                      skip: true
+                    },
+                    {
+                      begin: /(\s*)\(/,
+                      end: /\)/,
+                      excludeBegin: true,
+                      excludeEnd: true,
+                      keywords: KEYWORDS$1,
+                      contains: PARAMS_CONTAINS
+                    }
+                  ]
+                }
+              ]
+            },
+            { // could be a comma delimited list of params to a function call
+              begin: /,/,
+              relevance: 0
+            },
+            {
+              match: /\s+/,
+              relevance: 0
+            },
+            { // JSX
+              variants: [
+                { begin: FRAGMENT.begin, end: FRAGMENT.end },
+                { match: XML_SELF_CLOSING },
+                {
+                  begin: XML_TAG.begin,
+                  // we carefully check the opening tag to see if it truly
+                  // is a tag and not a false positive
+                  'on:begin': XML_TAG.isTrulyOpeningTag,
+                  end: XML_TAG.end
+                }
+              ],
+              subLanguage: 'xml',
+              contains: [
+                {
+                  begin: XML_TAG.begin,
+                  end: XML_TAG.end,
+                  skip: true,
+                  contains: ['self']
+                }
+              ]
+            }
+          ],
+        },
+        FUNCTION_DEFINITION,
+        {
+          // prevent this from getting swallowed up by function
+          // since they appear "function like"
+          beginKeywords: "while if switch catch for"
+        },
+        {
+          // we have to count the parens to make sure we actually have the correct
+          // bounding ( ).  There could be any number of sub-expressions inside
+          // also surrounded by parens.
+          begin: '\\b(?!function)' + hljs.UNDERSCORE_IDENT_RE +
+            '\\(' + // first parens
+            '[^()]*(\\(' +
+              '[^()]*(\\(' +
+                '[^()]*' +
+              '\\)[^()]*)*' +
+            '\\)[^()]*)*' +
+            '\\)\\s*\\{', // end parens
+          returnBegin:true,
+          label: "func.def",
+          contains: [
+            PARAMS,
+            hljs.inherit(hljs.TITLE_MODE, { begin: IDENT_RE$1, className: "title.function" })
+          ]
+        },
+        // catch ... so it won't trigger the property rule below
+        {
+          match: /\.\.\./,
+          relevance: 0
+        },
+        PROPERTY_ACCESS,
+        // hack: prevents detection of keywords in some circumstances
+        // .keyword()
+        // $keyword = x
+        {
+          match: '\\$' + IDENT_RE$1,
+          relevance: 0
+        },
+        {
+          match: [ /\bconstructor(?=\s*\()/ ],
+          className: { 1: "title.function" },
+          contains: [ PARAMS ]
+        },
+        FUNCTION_CALL,
+        UPPER_CASE_CONSTANT,
+        CLASS_OR_EXTENDS,
+        GETTER_OR_SETTER,
+        {
+          match: /\$[(.]/ // relevance booster for a pattern common to JS libs: `$(something)` and `$.something`
+        }
+      ]
+    };
+  }
+
+  /*
+  Language: TypeScript
+  Author: Panu Horsmalahti <[email protected]>
+  Contributors: Ike Ku <[email protected]>
+  Description: TypeScript is a strict superset of JavaScript
+  Website: https://www.typescriptlang.org
+  Category: common, scripting
+  */
+
+
+  /** @type LanguageFn */
+  function typescript(hljs) {
+    const regex = hljs.regex;
+    const tsLanguage = javascript(hljs);
+
+    const IDENT_RE$1 = IDENT_RE;
+    const TYPES = [
+      "any",
+      "void",
+      "number",
+      "boolean",
+      "string",
+      "object",
+      "never",
+      "symbol",
+      "bigint",
+      "unknown"
+    ];
+    const NAMESPACE = {
+      begin: [
+        /namespace/,
+        /\s+/,
+        hljs.IDENT_RE
+      ],
+      beginScope: {
+        1: "keyword",
+        3: "title.class"
+      }
+    };
+    const INTERFACE = {
+      beginKeywords: 'interface',
+      end: /\{/,
+      excludeEnd: true,
+      keywords: {
+        keyword: 'interface extends',
+        built_in: TYPES
+      },
+      contains: [ tsLanguage.exports.CLASS_REFERENCE ]
+    };
+    const USE_STRICT = {
+      className: 'meta',
+      relevance: 10,
+      begin: /^\s*['"]use strict['"]/
+    };
+    const TS_SPECIFIC_KEYWORDS = [
+      "type",
+      // "namespace",
+      "interface",
+      "public",
+      "private",
+      "protected",
+      "implements",
+      "declare",
+      "abstract",
+      "readonly",
+      "enum",
+      "override",
+      "satisfies"
+    ];
+    /*
+      namespace is a TS keyword but it's fine to use it as a variable name too.
+      const message = 'foo';
+      const namespace = 'bar';
+    */
+    const KEYWORDS$1 = {
+      $pattern: IDENT_RE,
+      keyword: KEYWORDS.concat(TS_SPECIFIC_KEYWORDS),
+      literal: LITERALS,
+      built_in: BUILT_INS.concat(TYPES),
+      "variable.language": BUILT_IN_VARIABLES
+    };
+
+    const DECORATOR = {
+      className: 'meta',
+      begin: '@' + IDENT_RE$1,
+    };
+
+    const swapMode = (mode, label, replacement) => {
+      const indx = mode.contains.findIndex(m => m.label === label);
+      if (indx === -1) { throw new Error("can not find mode to replace"); }
+
+      mode.contains.splice(indx, 1, replacement);
+    };
+
+
+    // this should update anywhere keywords is used since
+    // it will be the same actual JS object
+    Object.assign(tsLanguage.keywords, KEYWORDS$1);
+
+    tsLanguage.exports.PARAMS_CONTAINS.push(DECORATOR);
+
+    // highlight the function params
+    const ATTRIBUTE_HIGHLIGHT = tsLanguage.contains.find(c => c.scope === "attr");
+
+    // take default attr rule and extend it to support optionals
+    const OPTIONAL_KEY_OR_ARGUMENT = Object.assign({},
+      ATTRIBUTE_HIGHLIGHT,
+      { match: regex.concat(IDENT_RE$1, regex.lookahead(/\s*\?:/)) }
+    );
+    tsLanguage.exports.PARAMS_CONTAINS.push([
+      tsLanguage.exports.CLASS_REFERENCE, // class reference for highlighting the params types
+      ATTRIBUTE_HIGHLIGHT, // highlight the params key
+      OPTIONAL_KEY_OR_ARGUMENT, // Added for optional property assignment highlighting
+    ]);
+
+    // Add the optional property assignment highlighting for objects or classes
+    tsLanguage.contains = tsLanguage.contains.concat([
+      DECORATOR,
+      NAMESPACE,
+      INTERFACE,
+      OPTIONAL_KEY_OR_ARGUMENT, // Added for optional property assignment highlighting
+    ]);
+
+    // TS gets a simpler shebang rule than JS
+    swapMode(tsLanguage, "shebang", hljs.SHEBANG());
+    // JS use strict rule purposely excludes `asm` which makes no sense
+    swapMode(tsLanguage, "use_strict", USE_STRICT);
+
+    const functionDeclaration = tsLanguage.contains.find(m => m.label === "func.def");
+    functionDeclaration.relevance = 0; // () => {} is more typical in TypeScript
+
+    Object.assign(tsLanguage, {
+      name: 'TypeScript',
+      aliases: [
+        'ts',
+        'tsx',
+        'mts',
+        'cts'
+      ]
+    });
+
+    return tsLanguage;
+  }
+
+  return typescript;
+
+})();
+;
+export default hljsGrammar;
\ No newline at end of file