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

 /// <reference types="node" />
 
 // TypeScript Test
 
 class Student <beginfold id='1'>{</beginfold id='1'>
     fullName: string;
     constructor(public firstName: string, public middleInitial: string, public lastName: string) <beginfold id='1'>{</beginfold id='1'>
         this.fullName = firstName + " " + middleInitial + " " + lastName;
     <endfold id='1'>}</endfold id='1'>
 <endfold id='1'>}</endfold id='1'>
 
 interface Person <beginfold id='1'>{</beginfold id='1'>
     firstName: string;
     lastName: string;
 <endfold id='1'>}</endfold id='1'>
 
 function greeter(person : Person) <beginfold id='1'>{</beginfold id='1'>
     return "Hello, " + person.firstName + " " + person.lastName;
 <endfold id='1'>}</endfold id='1'>
 
 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<beginfold id='2'>`</beginfold id='2'>raw text \.\n${}<endfold id='2'>`</endfold id='2'>
 
 import http = require<beginfold id='3'>(</beginfold id='3'>"http"<endfold id='3'>)</endfold id='3'>;
 import path = require<beginfold id='3'>(</beginfold id='3'>"path"<endfold id='3'>)</endfold id='3'>;
 import URL = url.URL;
 import <beginfold id='1'>{</beginfold id='1'> Readable, Writable <endfold id='1'>}</endfold id='1'> from "stream";
 import <beginfold id='1'>{</beginfold id='1'> isBuffer, isString, isObject <endfold id='1'>}</endfold id='1'> from "util";
 
 const port = 8_88_8;
 const baseUrl = new URL(<beginfold id='4'>`</beginfold id='4'>http://localhost:${port}/<endfold id='4'>`</endfold id='4'>);
 const rootDir = path.dirname(__dirname);
 
 const defaultBrowser = os.platform() === "win32" ? "edge" : "chrome";
 let browser: "edge" | "chrome" | "none" = defaultBrowser;
 let grep: string | undefined;
 
 interface FileBasedTestConfiguration <beginfold id='1'>{</beginfold id='1'>
     <beginfold id='5'>[</beginfold id='5'>setting: string<endfold id='5'>]</endfold id='5'>: string;
 <endfold id='1'>}</endfold id='1'>
 
 function swapCase(s: string): string <beginfold id='1'>{</beginfold id='1'>
     return s.replace(/\w/g, (ch) => <beginfold id='1'>{</beginfold id='1'>
         const up = ch.toUpperCase();
         return ch === up ? ch.toLowerCase() : up;
     <endfold id='1'>}</endfold id='1'>);
 <endfold id='1'>}</endfold id='1'>
 
 for (var i in pieces) <beginfold id='1'>{</beginfold id='1'>
     switch (true) <beginfold id='1'>{</beginfold id='1'>
         case /^\"?Accession\"?/.test(pieces<beginfold id='5'>[</beginfold id='5'>i<endfold id='5'>]</endfold id='5'>):
             numeration<beginfold id='5'>[</beginfold id='5'>0<endfold id='5'>]</endfold id='5'> = i;
             break;
     <endfold id='1'>}</endfold id='1'>
 <endfold id='1'>}</endfold id='1'>
 
 const enum ResponseCode <beginfold id='1'>{</beginfold id='1'>
     Success = 200,
     BadRequest = 400
 <endfold id='1'>}</endfold id='1'>
 
 // Substitutions
 export function isInOpenInterval(start: number, end: number) <beginfold id='1'>{</beginfold id='1'>
     return tersible(a => a > start && a < end, () => <beginfold id='4'>`</beginfold id='4'>(${start}...${end})<endfold id='4'>`</endfold id='4'>)
 <endfold id='1'>}</endfold id='1'>
 const bar = <beginfold id='4'>`</beginfold id='4'>${x} ${y}<endfold id='4'>`</endfold id='4'>;
 
 // readonly
 function f1(mt: <beginfold id='5'>[</beginfold id='5'>number, number<endfold id='5'>]</endfold id='5'>, rt: readonly <beginfold id='5'>[</beginfold id='5'>number, number<endfold id='5'>]</endfold id='5'>) <beginfold id='1'>{</beginfold id='1'>
 <endfold id='1'>}</endfold id='1'>
 
 function f2(ma: string<beginfold id='5'>[</beginfold id='5'><endfold id='5'>]</endfold id='5'>, ra: readonly string<beginfold id='5'>[</beginfold id='5'><endfold id='5'>]</endfold id='5'>, mt: <beginfold id='5'>[</beginfold id='5'>string, string<endfold id='5'>]</endfold id='5'>, rt: readonly <beginfold id='5'>[</beginfold id='5'>string, string<endfold id='5'>]</endfold id='5'>) <beginfold id='1'>{</beginfold id='1'>
 <endfold id='1'>}</endfold id='1'>
 
 type ReadWrite<T> = <beginfold id='1'>{</beginfold id='1'> -readonly <beginfold id='5'>[</beginfold id='5'>P in keyof T<endfold id='5'>]</endfold id='5'> : T<beginfold id='5'>[</beginfold id='5'>P<endfold id='5'>]</endfold id='5'> <endfold id='1'>}</endfold id='1'>;
 
 // const assertion
 let obj = <beginfold id='1'>{</beginfold id='1'> x: 10, y: <beginfold id='5'>[</beginfold id='5'>20, 30<endfold id='5'>]</endfold id='5'>, z: <beginfold id='1'>{</beginfold id='1'> a: <beginfold id='1'>{</beginfold id='1'> b: 42 <endfold id='1'>}</endfold id='1'> <endfold id='1'>}</endfold id='1'> <endfold id='1'>}</endfold id='1'> as const;
 let r2 = <beginfold id='1'>{</beginfold id='1'> x: 20, y: 10 <endfold id='1'>}</endfold id='1'> as const;
 let r2 = <beginfold id='1'>{</beginfold id='1'>...p<endfold id='1'>}</endfold id='1'> as const;
 let p1 = <beginfold id='1'>{</beginfold id='1'> x: 10, y: 20 as const <endfold id='1'>}</endfold id='1'>;
 let p2 = <beginfold id='1'>{</beginfold id='1'> 10 as const, 'foo' as const <endfold id='1'>}</endfold id='1'>;
 
 // Definite assignment operator
 class Cl <beginfold id='1'>{</beginfold id='1'>
     one?: string;
     two!: string;
 <endfold id='1'>}</endfold id='1'>
 let x! = 1;
 
 // Function with multiple arguments
 const children = <beginfold id='5'>[</beginfold id='5'><endfold id='5'>]</endfold id='5'>.map<Set<Map<number, string>>>(element => <beginfold id='1'>{</beginfold id='1'>
     if (!this.identityProvider) <beginfold id='1'>{</beginfold id='1'>
         return element;
     <endfold id='1'>}</endfold id='1'>
     return element;
 <endfold id='1'>}</endfold id='1'>);
 
 // 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 = <beginfold id='4'>`</beginfold id='4'>Geeks<endfold id='4'>`</endfold id='4'>;
 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<<beginfold id='5'>[</beginfold id='5'>number<endfold id='5'>]</endfold id='5'>, number>(<beginfold id='4'>`</beginfold id='4'>
         SELECT *
         FROM statistics
         WHERE unit_id = $1<endfold id='4'>`</endfold id='4'>)
 
 function runQuery() <beginfold id='1'>{</beginfold id='1'>
     const query = createQuery<<beginfold id='5'>[</beginfold id='5'>number<beginfold id='5'>[</beginfold id='5'><endfold id='5'>]</endfold id='5'><endfold id='5'>]</endfold id='5'>, Table<Columns>>(<beginfold id='4'>`</beginfold id='4'>
         some SQL here
     <endfold id='4'>`</endfold id='4'>)
     return database.execute(query)
 <endfold id='1'>}</endfold id='1'>
 
 aa: <sdf/> string ?<ssd/> string
  string // Don't highlight
 aa: string assa |
    string
    string ;
    string
 
 aa: <beginfold id='1'>{</beginfold id='1'> string
     string <endfold id='1'>}</endfold id='1'> // Don't highlight
 
 aa: <beginfold id='5'>[</beginfold id='5'> string
       string <endfold id='5'>]</endfold id='5'>
 aa: ( string
       string ) // Don't highlight
 aa: string <string>
 interface a <beginfold id='1'>{</beginfold id='1'>
     aa: <beginfold id='6'>/*</beginfold id='6'> comment
         <endfold id='6'>*/</endfold id='6'> string,
     bb: <beginfold id='6'>/*</beginfold id='6'> comment <endfold id='6'>*/</endfold id='6'>
         number,
     cc: // comment
         void,
     dd:
         any,
 <endfold id='1'>}</endfold id='1'>
 
 null, <<beginfold id='1'>{</beginfold id='1'><beginfold id='5'>[</beginfold id='5'>key<endfold id='5'>]</endfold id='5'>: () => any<endfold id='1'>}</endfold id='1'>> null
 null, <<beginfold id='1'>{</beginfold id='1'><beginfold id='5'>[</beginfold id='5'>key<endfold id='5'>]</endfold id='5'>: () =><beginfold id='1'>{</beginfold id='1'>a: number<endfold id='1'>}</endfold id='1'><endfold id='1'>}</endfold id='1'>> null
 
 // Correctly highlighting regular expressions
 dt = ((dt<beginfold id='5'>[</beginfold id='5'>0<endfold id='5'>]</endfold id='5'> * 1e9 + dt<beginfold id='5'>[</beginfold id='5'>1<endfold id='5'>]</endfold id='5'>) / 1e6).toFixed(3).replace(/\.?0+$/, '') + 'ms';
 (a<beginfold id='5'>[</beginfold id='5'>0<endfold id='5'>]</endfold id='5'> / 2) / (2)
 
 // Type guards
 function isNumber(x: any): x is number <beginfold id='1'>{</beginfold id='1'>
     return typeof x === "number";
 <endfold id='1'>}</endfold id='1'>
 
 // Conditional expressions (highlight keywords before ":")
 class C <beginfold id='1'>{</beginfold id='1'>
     w = () =>
         this.a() ? true : this.b() ? false : true;
     z = () =>
         this.b() ? hello : k;
 <endfold id='1'>}</endfold id='1'>
 
 function foo<T extends X>(arg: T): T extends B ? number : string <beginfold id='1'>{</beginfold id='1'>
   if (arg === "A") return <T extends B ? number : never>111;
   return <T extends B ? never : string>"returning a string";
 <endfold id='1'>}</endfold id='1'>
 
 let x = (foo === null || foo === undefined) ?
     undefined :
     foo.bar.baz();
 let y = (foo === null || foo === undefined) ? <beginfold id='6'>/*</beginfold id='6'> comment <endfold id='6'>*/</endfold id='6'> 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 => <beginfold id='1'>{</beginfold id='1'><endfold id='1'>}</endfold id='1'>
 declare function assertIsString(value: unknown): asserts value is string;
 declare function assertIsArrayOfStrings(value: unknown): asserts value is string<beginfold id='5'>[</beginfold id='5'><endfold id='5'>]</endfold id='5'>;
 declare function assertDefined<T>(value: T): asserts value is NonNullable<T>;
 namespace Debug <beginfold id='1'>{</beginfold id='1'>
     export declare function assert(value: unknown, message?: string): asserts value;
     export declare function assertDefined<T>(value: T): asserts value is NonNullable<T>;
 <endfold id='1'>}</endfold id='1'>
 
 // 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; <beginfold id='6'>/*</beginfold id='6'>comment<endfold id='6'>*/</endfold id='6'> const b = 5;
 console.log("4" / "2"); // 2
 // Single quote
 const a = '6' / 2; <beginfold id='6'>/*</beginfold id='6'>comment<endfold id='6'>*/</endfold id='6'> const b = 5;
 console.log('4' / '2'); // 2
 // Template
 const a = <beginfold id='4'>`</beginfold id='4'>6<endfold id='4'>`</endfold id='4'> / 2; <beginfold id='6'>/*</beginfold id='6'>comment<endfold id='6'>*/</endfold id='6'> const b = 5;
 console.log(<beginfold id='4'>`</beginfold id='4'>4<endfold id='4'>`</endfold id='4'> / <beginfold id='4'>`</beginfold id='4'>2<endfold id='4'>`</endfold id='4'>); // 2
 
  <beginfold id='5'>[</beginfold id='5'>1, 2, 3<endfold id='5'>]</endfold id='5'>.reduce<readonly number<beginfold id='5'>[</beginfold id='5'><endfold id='5'>]</endfold id='5'>>((previous) => previous, <beginfold id='5'>[</beginfold id='5'><endfold id='5'>]</endfold id='5'>);
 
 // Multiline arrow assignment
 const h = <beginfold id='1'>{</beginfold id='1'>
   setSubProperty: <
       T extends A,
       K extends keyof T,
       J extends keyof T<beginfold id='5'>[</beginfold id='5'>K<endfold id='5'>]</endfold id='5'>
     >(
       property: K,
       key: J,
       value: T<beginfold id='5'>[</beginfold id='5'>K<endfold id='5'>]</endfold id='5'><beginfold id='5'>[</beginfold id='5'>J<endfold id='5'>]</endfold id='5'>
     ) =>  <beginfold id='1'>{</beginfold id='1'><endfold id='1'>}</endfold id='1'>
 <endfold id='1'>}</endfold id='1'>
 
 // Private-Named Instance Fields
 class Greeter <beginfold id='1'>{</beginfold id='1'>
     #name: string;
     constructor(name: string) <beginfold id='1'>{</beginfold id='1'>
         this.#name = name;
     <endfold id='1'>}</endfold id='1'>
     greet() <beginfold id='1'>{</beginfold id='1'>
         console.log(<beginfold id='4'>`</beginfold id='4'>hello ${this.#name}<endfold id='4'>`</endfold id='4'>);
     <endfold id='1'>}</endfold id='1'>
 <endfold id='1'>}</endfold id='1'>
 class Test <beginfold id='1'>{</beginfold id='1'>
     #NAME1: () => string;
     prop1 = x.#NAMEabc.#NAMEabc;
     prop2 = x.#NAMEabc.#NAMEabc();
     prop3 = this.#NAMEabc.#NAME();
 <endfold id='1'>}</endfold id='1'>
 
 // Type-only imports and exports
 import type T from "mod";
 import type <beginfold id='1'>{</beginfold id='1'> U, V <endfold id='1'>}</endfold id='1'> from "mod";
 import type * as types from "mod";
 import type from "mod";
 import type = require<beginfold id='3'>(</beginfold id='3'>"mod"<endfold id='3'>)</endfold id='3'>;
 import type T = require<beginfold id='3'>(</beginfold id='3'>"mod"<endfold id='3'>)</endfold id='3'>;
 
 export <beginfold id='1'>{</beginfold id='1'> a as b, x <endfold id='1'>}</endfold id='1'>;
 export * from "AnotherModule";
 export <beginfold id='1'>{</beginfold id='1'> k as m, l <endfold id='1'>}</endfold id='1'> from "AnotherModule";
 export type <beginfold id='1'>{</beginfold id='1'> T <endfold id='1'>}</endfold id='1'>;
 export type <beginfold id='1'>{</beginfold id='1'> U <endfold id='1'>}</endfold id='1'> from "AnotherModule";
 
 // 'awaited' type operator: https://github.com/microsoft/TypeScript/pull/35998
 let v1: awaited number;
 let v2: awaited Promise<number>;
 function f7<U>() <beginfold id='1'>{</beginfold id='1'>
     let v0: awaited U;
     let v1: awaited Promise<U>;
 <endfold id='1'>}</endfold id='1'>
 
 // Tagged template literals
 tagFunc<beginfold id='4'>`</beginfold id='4'>
     Hello world!
     ${ alert("Hello!"); }<endfold id='4'>`</endfold id='4'>;
 obj.something.tagFunc<beginfold id='4'>`</beginfold id='4'>Setting ${setting} is ${value + 5}!<endfold id='4'>`</endfold id='4'>;