Cherry-pick PR #46951 into release-4.5 (#47058)

Component commits:
e19aed3 Fix Awaited<T> for onfulfilled callbacks with more than one argument

f4b3ef2 Merge branch 'main' into fix46934

Co-authored-by: Ron Buckton <[email protected]>

src/lib/es5.d.ts

@@ -1495,7 +1495,7 @@ interface Promise<T> {
 type Awaited<T> =
     T extends null | undefined ? T : // special case for `null | undefined` when not in `--strictNullChecks` mode
         T extends object & { then(onfulfilled: infer F): any } ? // `await` only unwraps object types with a callable `then`. Non-object types are not unwrapped
-            F extends ((value: infer V) => any) ? // if the argument to `then` is callable, extracts the argument
+            F extends ((value: infer V, ...args: any) => any) ? // if the argument to `then` is callable, extracts the first argument
                 Awaited<V> : // recursively unwrap the value
                 never : // the argument to `then` was not callable
         T; // non-object or non-thenable

tests/baselines/reference/awaitedType.errors.txt

@@ -30,6 +30,9 @@ tests/cases/compiler/awaitedType.ts(22,12): error TS2589: Type instantiation is
                ~~~~~~~~~~~~~~~~~~~~
 !!! error TS2589: Type instantiation is excessively deep and possibly infinite.
 
+    // https://github.com/microsoft/TypeScript/issues/46934
+    type T18 = Awaited<{ then(cb: (value: number, other: { }) => void)}>; // number
+
     // https://github.com/microsoft/TypeScript/issues/33562
     type MaybePromise<T> = T | Promise<T> | PromiseLike<T>
     declare function MaybePromise<T>(value: T): MaybePromise<T>;

tests/baselines/reference/awaitedType.js

@@ -22,6 +22,9 @@ interface BadPromise1 { then(cb: (value: BadPromise2) => void): void; }
 interface BadPromise2 { then(cb: (value: BadPromise1) => void): void; }
 type T17 = Awaited<BadPromise1>; // error
 
+// https://github.com/microsoft/TypeScript/issues/46934
+type T18 = Awaited<{ then(cb: (value: number, other: { }) => void)}>; // number
+
 // https://github.com/microsoft/TypeScript/issues/33562
 type MaybePromise<T> = T | Promise<T> | PromiseLike<T>
 declare function MaybePromise<T>(value: T): MaybePromise<T>;

tests/baselines/reference/awaitedType.types

@@ -75,6 +75,14 @@ interface BadPromise2 { then(cb: (value: BadPromise1) => void): void; }
 type T17 = Awaited<BadPromise1>; // error
 >T17 : any
 
+// https://github.com/microsoft/TypeScript/issues/46934
+type T18 = Awaited<{ then(cb: (value: number, other: { }) => void)}>; // number
+>T18 : number
+>then : (cb: (value: number, other: {}) => void) => any
+>cb : (value: number, other: {}) => void
+>value : number
+>other : {}
+
 // https://github.com/microsoft/TypeScript/issues/33562
 type MaybePromise<T> = T | Promise<T> | PromiseLike<T>
 >MaybePromise : MaybePromise<T>
@@ -105,9 +113,9 @@ async function main() {
     ] = await Promise.all([
 >await Promise.all([        MaybePromise(1),        MaybePromise('2'),        MaybePromise(true),    ]) : [number, string, boolean]
 >Promise.all([        MaybePromise(1),        MaybePromise('2'),        MaybePromise(true),    ]) : Promise<[number, string, boolean]>
->Promise.all : { <T>(values: Iterable<T | PromiseLike<T>>): Promise<Awaited<T>[]>; <T extends readonly unknown[] | []>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
+>Promise.all : { <T>(values: Iterable<T | PromiseLike<T>>): Promise<Awaited<T>[]>; <T extends [] | readonly unknown[]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
 >Promise : PromiseConstructor
->all : { <T>(values: Iterable<T | PromiseLike<T>>): Promise<Awaited<T>[]>; <T extends readonly unknown[] | []>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
+>all : { <T>(values: Iterable<T | PromiseLike<T>>): Promise<Awaited<T>[]>; <T extends [] | readonly unknown[]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
 >[        MaybePromise(1),        MaybePromise('2'),        MaybePromise(true),    ] : [number | Promise<1> | PromiseLike<1>, string | Promise<"2"> | PromiseLike<"2">, MaybePromise<true>]
 
         MaybePromise(1),

tests/baselines/reference/awaitedTypeStrictNull.errors.txt

@@ -30,6 +30,9 @@ tests/cases/compiler/awaitedTypeStrictNull.ts(22,12): error TS2589: Type instant
                ~~~~~~~~~~~~~~~~~~~~
 !!! error TS2589: Type instantiation is excessively deep and possibly infinite.
 
+    // https://github.com/microsoft/TypeScript/issues/46934
+    type T18 = Awaited<{ then(cb: (value: number, other: { }) => void)}>; // number
+
     // https://github.com/microsoft/TypeScript/issues/33562
     type MaybePromise<T> = T | Promise<T> | PromiseLike<T>
     declare function MaybePromise<T>(value: T): MaybePromise<T>;

tests/baselines/reference/awaitedTypeStrictNull.js

@@ -22,6 +22,9 @@ interface BadPromise1 { then(cb: (value: BadPromise2) => void): void; }
 interface BadPromise2 { then(cb: (value: BadPromise1) => void): void; }
 type T17 = Awaited<BadPromise1>; // error
 
+// https://github.com/microsoft/TypeScript/issues/46934
+type T18 = Awaited<{ then(cb: (value: number, other: { }) => void)}>; // number
+
 // https://github.com/microsoft/TypeScript/issues/33562
 type MaybePromise<T> = T | Promise<T> | PromiseLike<T>
 declare function MaybePromise<T>(value: T): MaybePromise<T>;

tests/baselines/reference/awaitedTypeStrictNull.symbols

@@ -60,21 +60,21 @@ type T12 = Awaited<Promise<Promise<number>>>;
 
 type T13 = _Expect<Awaited<Promise<Promise<number>> | string | null>, /*expected*/ string | number | null>; // otherwise just prints T13 in types tests, which isn't very helpful
 >T13 : Symbol(T13, Decl(awaitedTypeStrictNull.ts, 11, 45))
->_Expect : Symbol(_Expect, Decl(awaitedTypeStrictNull.ts, 54, 1))
+>_Expect : Symbol(_Expect, Decl(awaitedTypeStrictNull.ts, 57, 1))
 >Awaited : Symbol(Awaited, Decl(lib.es5.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
 
 type T14 = _Expect<Awaited<Promise<Promise<number>> | string | undefined>, /*expected*/ string | number | undefined>; // otherwise just prints T14 in types tests, which isn't very helpful
 >T14 : Symbol(T14, Decl(awaitedTypeStrictNull.ts, 12, 107))
->_Expect : Symbol(_Expect, Decl(awaitedTypeStrictNull.ts, 54, 1))
+>_Expect : Symbol(_Expect, Decl(awaitedTypeStrictNull.ts, 57, 1))
 >Awaited : Symbol(Awaited, Decl(lib.es5.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
 
 type T15 = _Expect<Awaited<Promise<Promise<number>> | string | null | undefined>, /*expected*/ string | number | null | undefined>; // otherwise just prints T15 in types tests, which isn't very helpful
 >T15 : Symbol(T15, Decl(awaitedTypeStrictNull.ts, 13, 117))
->_Expect : Symbol(_Expect, Decl(awaitedTypeStrictNull.ts, 54, 1))
+>_Expect : Symbol(_Expect, Decl(awaitedTypeStrictNull.ts, 57, 1))
 >Awaited : Symbol(Awaited, Decl(lib.es5.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
@@ -110,111 +110,120 @@ type T17 = Awaited<BadPromise1>; // error
 >Awaited : Symbol(Awaited, Decl(lib.es5.d.ts, --, --))
 >BadPromise1 : Symbol(BadPromise1, Decl(awaitedTypeStrictNull.ts, 17, 31))
 
+// https://github.com/microsoft/TypeScript/issues/46934
+type T18 = Awaited<{ then(cb: (value: number, other: { }) => void)}>; // number
+>T18 : Symbol(T18, Decl(awaitedTypeStrictNull.ts, 21, 32))
+>Awaited : Symbol(Awaited, Decl(lib.es5.d.ts, --, --))
+>then : Symbol(then, Decl(awaitedTypeStrictNull.ts, 24, 20))
+>cb : Symbol(cb, Decl(awaitedTypeStrictNull.ts, 24, 26))
+>value : Symbol(value, Decl(awaitedTypeStrictNull.ts, 24, 31))
+>other : Symbol(other, Decl(awaitedTypeStrictNull.ts, 24, 45))
+
 // https://github.com/microsoft/TypeScript/issues/33562
 type MaybePromise<T> = T | Promise<T> | PromiseLike<T>
->MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 24, 54), Decl(awaitedTypeStrictNull.ts, 21, 32))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 24, 18))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 24, 18))
+>MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 27, 54), Decl(awaitedTypeStrictNull.ts, 24, 69))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 27, 18))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 27, 18))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 24, 18))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 27, 18))
 >PromiseLike : Symbol(PromiseLike, Decl(lib.es5.d.ts, --, --))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 24, 18))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 27, 18))
 
 declare function MaybePromise<T>(value: T): MaybePromise<T>;
->MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 24, 54), Decl(awaitedTypeStrictNull.ts, 21, 32))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 25, 30))
->value : Symbol(value, Decl(awaitedTypeStrictNull.ts, 25, 33))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 25, 30))
->MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 24, 54), Decl(awaitedTypeStrictNull.ts, 21, 32))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 25, 30))
+>MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 27, 54), Decl(awaitedTypeStrictNull.ts, 24, 69))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 28, 30))
+>value : Symbol(value, Decl(awaitedTypeStrictNull.ts, 28, 33))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 28, 30))
+>MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 27, 54), Decl(awaitedTypeStrictNull.ts, 24, 69))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 28, 30))
 
 async function main() {
->main : Symbol(main, Decl(awaitedTypeStrictNull.ts, 25, 60))
+>main : Symbol(main, Decl(awaitedTypeStrictNull.ts, 28, 60))
 
     let aaa: number;
->aaa : Symbol(aaa, Decl(awaitedTypeStrictNull.ts, 28, 7))
+>aaa : Symbol(aaa, Decl(awaitedTypeStrictNull.ts, 31, 7))
 
     let bbb: string;
->bbb : Symbol(bbb, Decl(awaitedTypeStrictNull.ts, 29, 7))
+>bbb : Symbol(bbb, Decl(awaitedTypeStrictNull.ts, 32, 7))
 
     [
         aaa,
->aaa : Symbol(aaa, Decl(awaitedTypeStrictNull.ts, 28, 7))
+>aaa : Symbol(aaa, Decl(awaitedTypeStrictNull.ts, 31, 7))
 
         bbb,
->bbb : Symbol(bbb, Decl(awaitedTypeStrictNull.ts, 29, 7))
+>bbb : Symbol(bbb, Decl(awaitedTypeStrictNull.ts, 32, 7))
 
     ] = await Promise.all([
 >Promise.all : Symbol(PromiseConstructor.all, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
 >all : Symbol(PromiseConstructor.all, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
 
         MaybePromise(1),
->MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 24, 54), Decl(awaitedTypeStrictNull.ts, 21, 32))
+>MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 27, 54), Decl(awaitedTypeStrictNull.ts, 24, 69))
 
         MaybePromise('2'),
->MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 24, 54), Decl(awaitedTypeStrictNull.ts, 21, 32))
+>MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 27, 54), Decl(awaitedTypeStrictNull.ts, 24, 69))
 
         MaybePromise(true),
->MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 24, 54), Decl(awaitedTypeStrictNull.ts, 21, 32))
+>MaybePromise : Symbol(MaybePromise, Decl(awaitedTypeStrictNull.ts, 27, 54), Decl(awaitedTypeStrictNull.ts, 24, 69))
 
     ])
 }
 
 // https://github.com/microsoft/TypeScript/issues/45924
 class Api<D = {}> {
->Api : Symbol(Api, Decl(awaitedTypeStrictNull.ts, 38, 1))
->D : Symbol(D, Decl(awaitedTypeStrictNull.ts, 41, 10))
+>Api : Symbol(Api, Decl(awaitedTypeStrictNull.ts, 41, 1))
+>D : Symbol(D, Decl(awaitedTypeStrictNull.ts, 44, 10))
 
 	// Should result in `Promise<T>` instead of `Promise<Awaited<T>>`.
 	async post<T = D>() { return this.request<T>(); }
->post : Symbol(Api.post, Decl(awaitedTypeStrictNull.ts, 41, 19))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 43, 12))
->D : Symbol(D, Decl(awaitedTypeStrictNull.ts, 41, 10))
->this.request : Symbol(Api.request, Decl(awaitedTypeStrictNull.ts, 43, 50))
->this : Symbol(Api, Decl(awaitedTypeStrictNull.ts, 38, 1))
->request : Symbol(Api.request, Decl(awaitedTypeStrictNull.ts, 43, 50))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 43, 12))
+>post : Symbol(Api.post, Decl(awaitedTypeStrictNull.ts, 44, 19))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 46, 12))
+>D : Symbol(D, Decl(awaitedTypeStrictNull.ts, 44, 10))
+>this.request : Symbol(Api.request, Decl(awaitedTypeStrictNull.ts, 46, 50))
+>this : Symbol(Api, Decl(awaitedTypeStrictNull.ts, 41, 1))
+>request : Symbol(Api.request, Decl(awaitedTypeStrictNull.ts, 46, 50))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 46, 12))
 
 	async request<D>(): Promise<D> { throw new Error(); }
->request : Symbol(Api.request, Decl(awaitedTypeStrictNull.ts, 43, 50))
->D : Symbol(D, Decl(awaitedTypeStrictNull.ts, 44, 15))
+>request : Symbol(Api.request, Decl(awaitedTypeStrictNull.ts, 46, 50))
+>D : Symbol(D, Decl(awaitedTypeStrictNull.ts, 47, 15))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
->D : Symbol(D, Decl(awaitedTypeStrictNull.ts, 44, 15))
+>D : Symbol(D, Decl(awaitedTypeStrictNull.ts, 47, 15))
 >Error : Symbol(Error, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 }
 
 declare const api: Api;
->api : Symbol(api, Decl(awaitedTypeStrictNull.ts, 47, 13))
->Api : Symbol(Api, Decl(awaitedTypeStrictNull.ts, 38, 1))
+>api : Symbol(api, Decl(awaitedTypeStrictNull.ts, 50, 13))
+>Api : Symbol(Api, Decl(awaitedTypeStrictNull.ts, 41, 1))
 
 interface Obj { x: number }
->Obj : Symbol(Obj, Decl(awaitedTypeStrictNull.ts, 47, 23))
->x : Symbol(Obj.x, Decl(awaitedTypeStrictNull.ts, 48, 15))
+>Obj : Symbol(Obj, Decl(awaitedTypeStrictNull.ts, 50, 23))
+>x : Symbol(Obj.x, Decl(awaitedTypeStrictNull.ts, 51, 15))
 
 async function fn<T>(): Promise<T extends object ? { [K in keyof T]: Obj } : Obj> {
->fn : Symbol(fn, Decl(awaitedTypeStrictNull.ts, 48, 27))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 50, 18))
+>fn : Symbol(fn, Decl(awaitedTypeStrictNull.ts, 51, 27))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 53, 18))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2018.promise.d.ts, --, --))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 50, 18))
->K : Symbol(K, Decl(awaitedTypeStrictNull.ts, 50, 54))
->T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 50, 18))
->Obj : Symbol(Obj, Decl(awaitedTypeStrictNull.ts, 47, 23))
->Obj : Symbol(Obj, Decl(awaitedTypeStrictNull.ts, 47, 23))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 53, 18))
+>K : Symbol(K, Decl(awaitedTypeStrictNull.ts, 53, 54))
+>T : Symbol(T, Decl(awaitedTypeStrictNull.ts, 53, 18))
+>Obj : Symbol(Obj, Decl(awaitedTypeStrictNull.ts, 50, 23))
+>Obj : Symbol(Obj, Decl(awaitedTypeStrictNull.ts, 50, 23))
 
 	// Per #45924, this was failing due to incorrect inference both above and here.
 	// Should not error.
 	return api.post();
->api.post : Symbol(Api.post, Decl(awaitedTypeStrictNull.ts, 41, 19))
->api : Symbol(api, Decl(awaitedTypeStrictNull.ts, 47, 13))
->post : Symbol(Api.post, Decl(awaitedTypeStrictNull.ts, 41, 19))
+>api.post : Symbol(Api.post, Decl(awaitedTypeStrictNull.ts, 44, 19))
+>api : Symbol(api, Decl(awaitedTypeStrictNull.ts, 50, 13))
+>post : Symbol(Api.post, Decl(awaitedTypeStrictNull.ts, 44, 19))
 }
 
 // helps with tests where '.types' just prints out the type alias name
 type _Expect<TActual extends TExpected, TExpected> = TActual;
->_Expect : Symbol(_Expect, Decl(awaitedTypeStrictNull.ts, 54, 1))
->TActual : Symbol(TActual, Decl(awaitedTypeStrictNull.ts, 57, 13))
->TExpected : Symbol(TExpected, Decl(awaitedTypeStrictNull.ts, 57, 39))
->TExpected : Symbol(TExpected, Decl(awaitedTypeStrictNull.ts, 57, 39))
->TActual : Symbol(TActual, Decl(awaitedTypeStrictNull.ts, 57, 13))
+>_Expect : Symbol(_Expect, Decl(awaitedTypeStrictNull.ts, 57, 1))
+>TActual : Symbol(TActual, Decl(awaitedTypeStrictNull.ts, 60, 13))
+>TExpected : Symbol(TExpected, Decl(awaitedTypeStrictNull.ts, 60, 39))
+>TExpected : Symbol(TExpected, Decl(awaitedTypeStrictNull.ts, 60, 39))
+>TActual : Symbol(TActual, Decl(awaitedTypeStrictNull.ts, 60, 13))
 

tests/baselines/reference/awaitedTypeStrictNull.types

@@ -75,6 +75,14 @@ interface BadPromise2 { then(cb: (value: BadPromise1) => void): void; }
 type T17 = Awaited<BadPromise1>; // error
 >T17 : any
 
+// https://github.com/microsoft/TypeScript/issues/46934
+type T18 = Awaited<{ then(cb: (value: number, other: { }) => void)}>; // number
+>T18 : number
+>then : (cb: (value: number, other: {}) => void) => any
+>cb : (value: number, other: {}) => void
+>value : number
+>other : {}
+
 // https://github.com/microsoft/TypeScript/issues/33562
 type MaybePromise<T> = T | Promise<T> | PromiseLike<T>
 >MaybePromise : MaybePromise<T>
@@ -105,9 +113,9 @@ async function main() {
     ] = await Promise.all([
 >await Promise.all([        MaybePromise(1),        MaybePromise('2'),        MaybePromise(true),    ]) : [number, string, boolean]
 >Promise.all([        MaybePromise(1),        MaybePromise('2'),        MaybePromise(true),    ]) : Promise<[number, string, boolean]>
->Promise.all : { <T>(values: Iterable<T | PromiseLike<T>>): Promise<Awaited<T>[]>; <T extends readonly unknown[] | []>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
+>Promise.all : { <T>(values: Iterable<T | PromiseLike<T>>): Promise<Awaited<T>[]>; <T extends [] | readonly unknown[]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
 >Promise : PromiseConstructor
->all : { <T>(values: Iterable<T | PromiseLike<T>>): Promise<Awaited<T>[]>; <T extends readonly unknown[] | []>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
+>all : { <T>(values: Iterable<T | PromiseLike<T>>): Promise<Awaited<T>[]>; <T extends [] | readonly unknown[]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
 >[        MaybePromise(1),        MaybePromise('2'),        MaybePromise(true),    ] : [number | Promise<1> | PromiseLike<1>, string | Promise<"2"> | PromiseLike<"2">, MaybePromise<true>]
 
         MaybePromise(1),

tests/cases/compiler/awaitedType.ts

@@ -24,6 +24,9 @@ interface BadPromise1 { then(cb: (value: BadPromise2) => void): void; }
 interface BadPromise2 { then(cb: (value: BadPromise1) => void): void; }
 type T17 = Awaited<BadPromise1>; // error
 
+// https://github.com/microsoft/TypeScript/issues/46934
+type T18 = Awaited<{ then(cb: (value: number, other: { }) => void)}>; // number
+
 // https://github.com/microsoft/TypeScript/issues/33562
 type MaybePromise<T> = T | Promise<T> | PromiseLike<T>
 declare function MaybePromise<T>(value: T): MaybePromise<T>;