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Add tests
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‎tests/baselines/reference/typeParameterConstModifiers.errors.txt

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tests/cases/conformance/types/typeParameters/typeParameterLists/typeParameterConstModifiers.ts(40,14): error TS1277: 'const' modifier can only appear on a type parameter of a function, method or class
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tests/cases/conformance/types/typeParameters/typeParameterLists/typeParameterConstModifiers.ts(42,9): error TS1277: 'const' modifier can only appear on a type parameter of a function, method or class
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==== tests/cases/conformance/types/typeParameters/typeParameterLists/typeParameterConstModifiers.ts (2 errors) ====
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declare function f1<const T>(x: T): T;
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const x11 = f1('a');
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const x12 = f1(['a', ['b', 'c']]);
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const x13 = f1({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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declare function f2<const T, U>(x: T | undefined): T;
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const x21 = f2('a');
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const x22 = f2(['a', ['b', 'c']]);
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const x23 = f2({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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declare function f3<const T>(x: T): T[];
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const x31 = f3("hello");
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const x32 = f3("hello");
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declare function f4<const T>(obj: [T, T]): T;
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const x41 = f4([[1, 'x'], [2, 'y']]);
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const x42 = f4([{ a: 1, b: 'x' }, { a: 2, b: 'y' }]);
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declare function f5<const T>(obj: { x: T, y: T }): T;
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const x51 = f5({ x: [1, 'x'], y: [2, 'y'] });
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const x52 = f5({ x: { a: 1, b: 'x' }, y: { a: 2, b: 'y' } });
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declare function f6<const T extends readonly unknown[]>(...args: T): T;
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const x61 = f6(1, 'b', { a: 1, b: 'x' });
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class C1<const T> {
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constructor(x: T) {}
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foo<const U>(x: U) { return x; }
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}
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const c71 = new C1({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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const c72 = c71.foo(['a', ['b', 'c']]);
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interface I1<const T> { x: T } // Error
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~~~~~
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!!! error TS1277: 'const' modifier can only appear on a type parameter of a function, method or class
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type T1<const T> = T; // Error
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~~~~~
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!!! error TS1277: 'const' modifier can only appear on a type parameter of a function, method or class
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// Corrected repro from #51745
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type Obj = { a: { b: { c: "123" } } };
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type GetPath<T, P> =
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P extends readonly [] ? T :
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P extends readonly [infer A extends keyof T, ...infer Rest] ? GetPath<T[A], Rest> :
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never;
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function set<T, const P extends readonly string[]>(obj: T, path: P, value: GetPath<T, P>) {}
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declare let obj: Obj;
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declare let value: "123";
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set(obj, ['a', 'b', 'c'], value);
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‎tests/baselines/reference/typeParameterConstModifiers.js

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//// [typeParameterConstModifiers.ts]
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declare function f1<const T>(x: T): T;
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const x11 = f1('a');
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const x12 = f1(['a', ['b', 'c']]);
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const x13 = f1({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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declare function f2<const T, U>(x: T | undefined): T;
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const x21 = f2('a');
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const x22 = f2(['a', ['b', 'c']]);
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const x23 = f2({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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declare function f3<const T>(x: T): T[];
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const x31 = f3("hello");
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const x32 = f3("hello");
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declare function f4<const T>(obj: [T, T]): T;
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const x41 = f4([[1, 'x'], [2, 'y']]);
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const x42 = f4([{ a: 1, b: 'x' }, { a: 2, b: 'y' }]);
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declare function f5<const T>(obj: { x: T, y: T }): T;
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const x51 = f5({ x: [1, 'x'], y: [2, 'y'] });
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const x52 = f5({ x: { a: 1, b: 'x' }, y: { a: 2, b: 'y' } });
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declare function f6<const T extends readonly unknown[]>(...args: T): T;
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const x61 = f6(1, 'b', { a: 1, b: 'x' });
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class C1<const T> {
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constructor(x: T) {}
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foo<const U>(x: U) { return x; }
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}
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const c71 = new C1({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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const c72 = c71.foo(['a', ['b', 'c']]);
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interface I1<const T> { x: T } // Error
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type T1<const T> = T; // Error
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// Corrected repro from #51745
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type Obj = { a: { b: { c: "123" } } };
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type GetPath<T, P> =
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P extends readonly [] ? T :
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P extends readonly [infer A extends keyof T, ...infer Rest] ? GetPath<T[A], Rest> :
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never;
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function set<T, const P extends readonly string[]>(obj: T, path: P, value: GetPath<T, P>) {}
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declare let obj: Obj;
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declare let value: "123";
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set(obj, ['a', 'b', 'c'], value);
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//// [typeParameterConstModifiers.js]
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"use strict";
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var x11 = f1('a');
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var x12 = f1(['a', ['b', 'c']]);
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var x13 = f1({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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var x21 = f2('a');
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var x22 = f2(['a', ['b', 'c']]);
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var x23 = f2({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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var x31 = f3("hello");
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var x32 = f3("hello");
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var x41 = f4([[1, 'x'], [2, 'y']]);
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var x42 = f4([{ a: 1, b: 'x' }, { a: 2, b: 'y' }]);
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var x51 = f5({ x: [1, 'x'], y: [2, 'y'] });
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var x52 = f5({ x: { a: 1, b: 'x' }, y: { a: 2, b: 'y' } });
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var x61 = f6(1, 'b', { a: 1, b: 'x' });
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var C1 = /** @class */ (function () {
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function C1(x) {
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}
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C1.prototype.foo = function (x) { return x; };
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return C1;
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}());
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var c71 = new C1({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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var c72 = c71.foo(['a', ['b', 'c']]);
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function set(obj, path, value) { }
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set(obj, ['a', 'b', 'c'], value);

‎tests/baselines/reference/typeParameterConstModifiers.symbols

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=== tests/cases/conformance/types/typeParameters/typeParameterLists/typeParameterConstModifiers.ts ===
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declare function f1<const T>(x: T): T;
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>f1 : Symbol(f1, Decl(typeParameterConstModifiers.ts, 0, 0))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 0, 20))
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>x : Symbol(x, Decl(typeParameterConstModifiers.ts, 0, 29))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 0, 20))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 0, 20))
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const x11 = f1('a');
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>x11 : Symbol(x11, Decl(typeParameterConstModifiers.ts, 2, 5))
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>f1 : Symbol(f1, Decl(typeParameterConstModifiers.ts, 0, 0))
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const x12 = f1(['a', ['b', 'c']]);
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>x12 : Symbol(x12, Decl(typeParameterConstModifiers.ts, 3, 5))
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>f1 : Symbol(f1, Decl(typeParameterConstModifiers.ts, 0, 0))
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const x13 = f1({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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>x13 : Symbol(x13, Decl(typeParameterConstModifiers.ts, 4, 5))
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>f1 : Symbol(f1, Decl(typeParameterConstModifiers.ts, 0, 0))
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>a : Symbol(a, Decl(typeParameterConstModifiers.ts, 4, 16))
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>b : Symbol(b, Decl(typeParameterConstModifiers.ts, 4, 22))
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>d : Symbol(d, Decl(typeParameterConstModifiers.ts, 4, 30))
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>f : Symbol(f, Decl(typeParameterConstModifiers.ts, 4, 50))
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declare function f2<const T, U>(x: T | undefined): T;
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>f2 : Symbol(f2, Decl(typeParameterConstModifiers.ts, 4, 64))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 6, 20))
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>U : Symbol(U, Decl(typeParameterConstModifiers.ts, 6, 28))
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>x : Symbol(x, Decl(typeParameterConstModifiers.ts, 6, 32))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 6, 20))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 6, 20))
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const x21 = f2('a');
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>x21 : Symbol(x21, Decl(typeParameterConstModifiers.ts, 8, 5))
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>f2 : Symbol(f2, Decl(typeParameterConstModifiers.ts, 4, 64))
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const x22 = f2(['a', ['b', 'c']]);
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>x22 : Symbol(x22, Decl(typeParameterConstModifiers.ts, 9, 5))
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>f2 : Symbol(f2, Decl(typeParameterConstModifiers.ts, 4, 64))
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const x23 = f2({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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>x23 : Symbol(x23, Decl(typeParameterConstModifiers.ts, 10, 5))
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>f2 : Symbol(f2, Decl(typeParameterConstModifiers.ts, 4, 64))
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>a : Symbol(a, Decl(typeParameterConstModifiers.ts, 10, 16))
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>b : Symbol(b, Decl(typeParameterConstModifiers.ts, 10, 22))
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>d : Symbol(d, Decl(typeParameterConstModifiers.ts, 10, 30))
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>f : Symbol(f, Decl(typeParameterConstModifiers.ts, 10, 50))
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declare function f3<const T>(x: T): T[];
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>f3 : Symbol(f3, Decl(typeParameterConstModifiers.ts, 10, 64))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 12, 20))
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>x : Symbol(x, Decl(typeParameterConstModifiers.ts, 12, 29))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 12, 20))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 12, 20))
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const x31 = f3("hello");
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>x31 : Symbol(x31, Decl(typeParameterConstModifiers.ts, 14, 5))
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>f3 : Symbol(f3, Decl(typeParameterConstModifiers.ts, 10, 64))
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const x32 = f3("hello");
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>x32 : Symbol(x32, Decl(typeParameterConstModifiers.ts, 15, 5))
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>f3 : Symbol(f3, Decl(typeParameterConstModifiers.ts, 10, 64))
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declare function f4<const T>(obj: [T, T]): T;
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>f4 : Symbol(f4, Decl(typeParameterConstModifiers.ts, 15, 24))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 17, 20))
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>obj : Symbol(obj, Decl(typeParameterConstModifiers.ts, 17, 29))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 17, 20))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 17, 20))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 17, 20))
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const x41 = f4([[1, 'x'], [2, 'y']]);
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>x41 : Symbol(x41, Decl(typeParameterConstModifiers.ts, 19, 5))
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>f4 : Symbol(f4, Decl(typeParameterConstModifiers.ts, 15, 24))
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const x42 = f4([{ a: 1, b: 'x' }, { a: 2, b: 'y' }]);
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>x42 : Symbol(x42, Decl(typeParameterConstModifiers.ts, 20, 5))
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>f4 : Symbol(f4, Decl(typeParameterConstModifiers.ts, 15, 24))
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>a : Symbol(a, Decl(typeParameterConstModifiers.ts, 20, 17))
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>b : Symbol(b, Decl(typeParameterConstModifiers.ts, 20, 23))
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>a : Symbol(a, Decl(typeParameterConstModifiers.ts, 20, 35))
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>b : Symbol(b, Decl(typeParameterConstModifiers.ts, 20, 41))
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declare function f5<const T>(obj: { x: T, y: T }): T;
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>f5 : Symbol(f5, Decl(typeParameterConstModifiers.ts, 20, 53))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 22, 20))
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>obj : Symbol(obj, Decl(typeParameterConstModifiers.ts, 22, 29))
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>x : Symbol(x, Decl(typeParameterConstModifiers.ts, 22, 35))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 22, 20))
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>y : Symbol(y, Decl(typeParameterConstModifiers.ts, 22, 41))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 22, 20))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 22, 20))
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const x51 = f5({ x: [1, 'x'], y: [2, 'y'] });
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>x51 : Symbol(x51, Decl(typeParameterConstModifiers.ts, 24, 5))
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>f5 : Symbol(f5, Decl(typeParameterConstModifiers.ts, 20, 53))
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>x : Symbol(x, Decl(typeParameterConstModifiers.ts, 24, 16))
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>y : Symbol(y, Decl(typeParameterConstModifiers.ts, 24, 29))
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const x52 = f5({ x: { a: 1, b: 'x' }, y: { a: 2, b: 'y' } });
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>x52 : Symbol(x52, Decl(typeParameterConstModifiers.ts, 25, 5))
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>f5 : Symbol(f5, Decl(typeParameterConstModifiers.ts, 20, 53))
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>x : Symbol(x, Decl(typeParameterConstModifiers.ts, 25, 16))
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>a : Symbol(a, Decl(typeParameterConstModifiers.ts, 25, 21))
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>b : Symbol(b, Decl(typeParameterConstModifiers.ts, 25, 27))
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>y : Symbol(y, Decl(typeParameterConstModifiers.ts, 25, 37))
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>a : Symbol(a, Decl(typeParameterConstModifiers.ts, 25, 42))
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>b : Symbol(b, Decl(typeParameterConstModifiers.ts, 25, 48))
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declare function f6<const T extends readonly unknown[]>(...args: T): T;
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>f6 : Symbol(f6, Decl(typeParameterConstModifiers.ts, 25, 61))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 27, 20))
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>args : Symbol(args, Decl(typeParameterConstModifiers.ts, 27, 56))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 27, 20))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 27, 20))
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const x61 = f6(1, 'b', { a: 1, b: 'x' });
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>x61 : Symbol(x61, Decl(typeParameterConstModifiers.ts, 29, 5))
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>f6 : Symbol(f6, Decl(typeParameterConstModifiers.ts, 25, 61))
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>a : Symbol(a, Decl(typeParameterConstModifiers.ts, 29, 24))
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>b : Symbol(b, Decl(typeParameterConstModifiers.ts, 29, 30))
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class C1<const T> {
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>C1 : Symbol(C1, Decl(typeParameterConstModifiers.ts, 29, 41))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 31, 9))
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constructor(x: T) {}
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>x : Symbol(x, Decl(typeParameterConstModifiers.ts, 32, 16))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 31, 9))
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foo<const U>(x: U) { return x; }
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>foo : Symbol(C1.foo, Decl(typeParameterConstModifiers.ts, 32, 24))
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>U : Symbol(U, Decl(typeParameterConstModifiers.ts, 33, 8))
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>x : Symbol(x, Decl(typeParameterConstModifiers.ts, 33, 17))
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>U : Symbol(U, Decl(typeParameterConstModifiers.ts, 33, 8))
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>x : Symbol(x, Decl(typeParameterConstModifiers.ts, 33, 17))
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}
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const c71 = new C1({ a: 1, b: "c", d: ["e", 2, true, { f: "g" }] });
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>c71 : Symbol(c71, Decl(typeParameterConstModifiers.ts, 36, 5))
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>C1 : Symbol(C1, Decl(typeParameterConstModifiers.ts, 29, 41))
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>a : Symbol(a, Decl(typeParameterConstModifiers.ts, 36, 20))
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>b : Symbol(b, Decl(typeParameterConstModifiers.ts, 36, 26))
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>d : Symbol(d, Decl(typeParameterConstModifiers.ts, 36, 34))
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>f : Symbol(f, Decl(typeParameterConstModifiers.ts, 36, 54))
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const c72 = c71.foo(['a', ['b', 'c']]);
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>c72 : Symbol(c72, Decl(typeParameterConstModifiers.ts, 37, 5))
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>c71.foo : Symbol(C1.foo, Decl(typeParameterConstModifiers.ts, 32, 24))
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>c71 : Symbol(c71, Decl(typeParameterConstModifiers.ts, 36, 5))
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>foo : Symbol(C1.foo, Decl(typeParameterConstModifiers.ts, 32, 24))
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interface I1<const T> { x: T } // Error
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>I1 : Symbol(I1, Decl(typeParameterConstModifiers.ts, 37, 39))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 39, 13))
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>x : Symbol(I1.x, Decl(typeParameterConstModifiers.ts, 39, 23))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 39, 13))
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type T1<const T> = T; // Error
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>T1 : Symbol(T1, Decl(typeParameterConstModifiers.ts, 39, 30))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 41, 8))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 41, 8))
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// Corrected repro from #51745
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type Obj = { a: { b: { c: "123" } } };
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>Obj : Symbol(Obj, Decl(typeParameterConstModifiers.ts, 41, 21))
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>a : Symbol(a, Decl(typeParameterConstModifiers.ts, 45, 12))
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>b : Symbol(b, Decl(typeParameterConstModifiers.ts, 45, 17))
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>c : Symbol(c, Decl(typeParameterConstModifiers.ts, 45, 22))
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type GetPath<T, P> =
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>GetPath : Symbol(GetPath, Decl(typeParameterConstModifiers.ts, 45, 38))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 47, 13))
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>P : Symbol(P, Decl(typeParameterConstModifiers.ts, 47, 15))
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P extends readonly [] ? T :
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>P : Symbol(P, Decl(typeParameterConstModifiers.ts, 47, 15))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 47, 13))
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P extends readonly [infer A extends keyof T, ...infer Rest] ? GetPath<T[A], Rest> :
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>P : Symbol(P, Decl(typeParameterConstModifiers.ts, 47, 15))
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>A : Symbol(A, Decl(typeParameterConstModifiers.ts, 49, 29))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 47, 13))
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>Rest : Symbol(Rest, Decl(typeParameterConstModifiers.ts, 49, 57))
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>GetPath : Symbol(GetPath, Decl(typeParameterConstModifiers.ts, 45, 38))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 47, 13))
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>A : Symbol(A, Decl(typeParameterConstModifiers.ts, 49, 29))
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>Rest : Symbol(Rest, Decl(typeParameterConstModifiers.ts, 49, 57))
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never;
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function set<T, const P extends readonly string[]>(obj: T, path: P, value: GetPath<T, P>) {}
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>set : Symbol(set, Decl(typeParameterConstModifiers.ts, 50, 10))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 52, 13))
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>P : Symbol(P, Decl(typeParameterConstModifiers.ts, 52, 15))
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>obj : Symbol(obj, Decl(typeParameterConstModifiers.ts, 52, 51))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 52, 13))
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>path : Symbol(path, Decl(typeParameterConstModifiers.ts, 52, 58))
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>P : Symbol(P, Decl(typeParameterConstModifiers.ts, 52, 15))
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>value : Symbol(value, Decl(typeParameterConstModifiers.ts, 52, 67))
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>GetPath : Symbol(GetPath, Decl(typeParameterConstModifiers.ts, 45, 38))
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>T : Symbol(T, Decl(typeParameterConstModifiers.ts, 52, 13))
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>P : Symbol(P, Decl(typeParameterConstModifiers.ts, 52, 15))
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declare let obj: Obj;
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>obj : Symbol(obj, Decl(typeParameterConstModifiers.ts, 54, 11))
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>Obj : Symbol(Obj, Decl(typeParameterConstModifiers.ts, 41, 21))
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declare let value: "123";
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>value : Symbol(value, Decl(typeParameterConstModifiers.ts, 55, 11))
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set(obj, ['a', 'b', 'c'], value);
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>set : Symbol(set, Decl(typeParameterConstModifiers.ts, 50, 10))
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>obj : Symbol(obj, Decl(typeParameterConstModifiers.ts, 54, 11))
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>value : Symbol(value, Decl(typeParameterConstModifiers.ts, 55, 11))
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