Warning, /frameworks/syntax-highlighting/autotests/input/test.ts is written in an unsupported language. File is not indexed.

 /// <reference types="node" />
 
 // TypeScript Test
 
 class Student {
     fullName: string;
     constructor(public firstName: string, public middleInitial: string, public lastName: string) {
         this.fullName = firstName + " " + middleInitial + " " + lastName;
     }
 }
 
 interface Person {
     firstName: string;
     lastName: string;
 }
 
 function greeter(person : Person) {
     return "Hello, " + person.firstName + " " + person.lastName;
 }
 
 let user = new Student("Jane", "M.", "User");
 
 // Built-in
 document.body.innerHTML = greeter(user); to
 JSON.stringify()
 console.log("Hello world");
 const os = require('os');
 Math.LOG10E;
 Number.MAX_SAFE_INTEGER;
 String.raw`raw text \.\n${}`
 
 import http = require("http");
 import path = require("path");
 import URL = url.URL;
 import { Readable, Writable } from "stream";
 import { isBuffer, isString, isObject } from "util";
 
 const port = 8_88_8;
 const baseUrl = new URL(`http://localhost:${port}/`);
 const rootDir = path.dirname(__dirname);
 
 const defaultBrowser = os.platform() === "win32" ? "edge" : "chrome";
 let browser: "edge" | "chrome" | "none" = defaultBrowser;
 let grep: string | undefined;
 
 interface FileBasedTestConfiguration {
     [setting: string]: string;
 }
 
 function swapCase(s: string): string {
     return s.replace(/\w/g, (ch) => {
         const up = ch.toUpperCase();
         return ch === up ? ch.toLowerCase() : up;
     });
 }
 
 for (var i in pieces) {
     switch (true) {
         case /^\"?Accession\"?/.test(pieces[i]):
             numeration[0] = i;
             break;
     }
 }
 
 const enum ResponseCode {
     Success = 200,
     BadRequest = 400
 }
 
 // Substitutions
 export function isInOpenInterval(start: number, end: number) {
     return tersible(a => a > start && a < end, () => `(${start}...${end})`)
 }
 const bar = `${x} ${y}`;
 
 // readonly
 function f1(mt: [number, number], rt: readonly [number, number]) {
 }
 
 function f2(ma: string[], ra: readonly string[], mt: [string, string], rt: readonly [string, string]) {
 }
 
 type ReadWrite<T> = { -readonly [P in keyof T] : T[P] };
 
 // const assertion
 let obj = { x: 10, y: [20, 30], z: { a: { b: 42 } } } as const;
 let r2 = { x: 20, y: 10 } as const;
 let r2 = {...p} as const;
 let p1 = { x: 10, y: 20 as const };
 let p2 = { 10 as const, 'foo' as const };
 
 // Definite assignment operator
 class Cl {
     one?: string;
     two!: string;
 }
 let x! = 1;
 
 // Function with multiple arguments
 const children = [].map<Set<Map<number, string>>>(element => {
     if (!this.identityProvider) {
         return element;
     }
     return element;
 });
 
 // Numerics
 var a = 0xA;
 var b = 0b1;
 var c = 0o7;
 var d = 1.1E+3;
 var e = 1.E+3;
 var f = .1E+3;
 var g = 1E+3;
 var h = 1.1;
 var i = 1.;
 var j = .1;
 var k =  1;
 var l = 1_2.e+3_22 | .2e2 | 0o1_23 | 11.2 | 08;
 
 // Bigint
 const binBig = 0b101n;
 const octBig = 0o567n;
 const hexBig = 0xC0Bn;
 const decBig = 123n;
 
 // Invalid numbers
 var l = 0xA1t;
 var m = 0b0123;
 var n = 0o29;
 var n = 0_7;
 var n = 1___1;
 var n = 1__;
 var n = 11__.;
 var n = 1__.e+3_22;
 var n = .2_e2;
 
 // Types
 let a: null = null;
 let b: number = 123;
 let c: number = 123.456;
 let d: string = `Geeks`;
 let e: undefined = undefined;
 let f: boolean = true;
 let g: number = 0b111001; // Binary
 let h: number = 0o436; // Octal
 let i: number = 0xadf0d; // Hexa-Decimal
 let j: bigint = 123n;
 
 const query = query<[number], number>(`
         SELECT *
         FROM statistics
         WHERE unit_id = $1`)
 
 function runQuery() {
     const query = createQuery<[number[]], Table<Columns>>(`
         some SQL here
     `)
     return database.execute(query)
 }
 
 aa: <sdf/> string ?<ssd/> string
  string // Don't highlight
 aa: string assa |
    string
    string ;
    string
 
 aa: { string
     string } // Don't highlight
 
 aa: [ string
       string ]
 aa: ( string
       string ) // Don't highlight
 aa: string <string>
 interface a {
     aa: /* comment
         */ string,
     bb: /* comment */
         number,
     cc: // comment
         void,
     dd:
         any,
 }
 
 null, <{[key]: () => any}> null
 null, <{[key]: () =>{a: number}}> null
 
 // Correctly highlighting regular expressions
 dt = ((dt[0] * 1e9 + dt[1]) / 1e6).toFixed(3).replace(/\.?0+$/, '') + 'ms';
 (a[0] / 2) / (2)
 
 // Type guards
 function isNumber(x: any): x is number {
     return typeof x === "number";
 }
 
 // Conditional expressions (highlight keywords before ":")
 class C {
     w = () =>
         this.a() ? true : this.b() ? false : true;
     z = () =>
         this.b() ? hello : k;
 }
 
 function foo<T extends X>(arg: T): T extends B ? number : string {
   if (arg === "A") return <T extends B ? number : never>111;
   return <T extends B ? never : string>"returning a string";
 }
 
 let x = (foo === null || foo === undefined) ?
     undefined :
     foo.bar.baz();
 let y = (foo === null || foo === undefined) ? /* comment */ undefined :
     foo.bar.baz();
 
 // Operator ??
 let x = foo ?? bar();
 
 // Types and logical `&&` and `||` operators after `as` expression
 Date as any || null;
 
 //Assertions
 const assert: (value: unknown) => asserts value = value => {}
 declare function assertIsString(value: unknown): asserts value is string;
 declare function assertIsArrayOfStrings(value: unknown): asserts value is string[];
 declare function assertDefined<T>(value: T): asserts value is NonNullable<T>;
 namespace Debug {
     export declare function assert(value: unknown, message?: string): asserts value;
     export declare function assertDefined<T>(value: T): asserts value is NonNullable<T>;
 }
 
 // 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
 
  [1, 2, 3].reduce<readonly number[]>((previous) => previous, []);
 
 // Multiline arrow assignment
 const h = {
   setSubProperty: <
       T extends A,
       K extends keyof T,
       J extends keyof T[K]
     >(
       property: K,
       key: J,
       value: T[K][J]
     ) =>  {}
 }
 
 // Private-Named Instance Fields
 class Greeter {
     #name: string;
     constructor(name: string) {
         this.#name = name;
     }
     greet() {
         console.log(`hello ${this.#name}`);
     }
 }
 class Test {
     #NAME1: () => string;
     prop1 = x.#NAMEabc.#NAMEabc;
     prop2 = x.#NAMEabc.#NAMEabc();
     prop3 = this.#NAMEabc.#NAME();
 }
 
 // Type-only imports and exports
 import type T from "mod";
 import type { U, V } from "mod";
 import type * as types from "mod";
 import type from "mod";
 import type = require("mod");
 import type T = require("mod");
 
 export { a as b, x };
 export * from "AnotherModule";
 export { k as m, l } from "AnotherModule";
 export type { T };
 export type { U } from "AnotherModule";
 
 // 'awaited' type operator: https://github.com/microsoft/TypeScript/pull/35998
 let v1: awaited number;
 let v2: awaited Promise<number>;
 function f7<U>() {
     let v0: awaited U;
     let v1: awaited Promise<U>;
 }
 
 // Tagged template literals
 tagFunc`
     Hello world!
     ${ alert("Hello!"); }`;
 obj.something.tagFunc`Setting ${setting} is ${value + 5}!`;