diff --git a/tests/baselines/reference/promiseType.js b/tests/baselines/reference/promiseType.js
index 84d9d713b4810..d6cdae6b83abb 100644
--- a/tests/baselines/reference/promiseType.js
+++ b/tests/baselines/reference/promiseType.js
@@ -217,6 +217,26 @@ const pc6 = p.then(() => Promise.reject("1"), () => {});
 const pc7 = p.then(() => Promise.reject("1"), () => {throw 1});
 const pc8 = p.then(() => Promise.reject("1"), () => Promise.resolve(1));
 const pc9 = p.then(() => Promise.reject("1"), () => Promise.reject(1));
+
+declare const x2: Promise<number> | string;
+
+// #28427
+
+Promise.all([x2]);
+
+// #33074
+
+Promise.resolve(x2);
+
+// #30390
+
+declare function f1(): Promise<number> | string;
+p.then(f1);
+
+// #33062
+
+declare function f2(resolve: (value: Promise<number> | string) => void);
+new Promise(f2);
 
 
 //// [promiseType.js]
@@ -440,3 +460,9 @@ const pc6 = p.then(() => Promise.reject("1"), () => { });
 const pc7 = p.then(() => Promise.reject("1"), () => { throw 1; });
 const pc8 = p.then(() => Promise.reject("1"), () => Promise.resolve(1));
 const pc9 = p.then(() => Promise.reject("1"), () => Promise.reject(1));
+// #28427
+Promise.all([x2]);
+// #33074
+Promise.resolve(x2);
+p.then(f1);
+new Promise(f2);
diff --git a/tests/baselines/reference/promiseType.symbols b/tests/baselines/reference/promiseType.symbols
index cec81cd7d8266..a8a8428dc8d32 100644
--- a/tests/baselines/reference/promiseType.symbols
+++ b/tests/baselines/reference/promiseType.symbols
@@ -1089,3 +1089,47 @@ const pc9 = p.then(() => Promise.reject("1"), () => Promise.reject(1));
 >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, --, --))
 >reject : Symbol(PromiseConstructor.reject, Decl(lib.es2015.promise.d.ts, --, --))
 
+declare const x2: Promise<number> | string;
+>x2 : Symbol(x2, Decl(promiseType.ts, 219, 13))
+>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, --, --))
+
+// #28427
+
+Promise.all([x2]);
+>Promise.all : Symbol(PromiseConstructor.all, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --) ... and 6 more)
+>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, --, --))
+>all : Symbol(PromiseConstructor.all, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --) ... and 6 more)
+>x2 : Symbol(x2, Decl(promiseType.ts, 219, 13))
+
+// #33074
+
+Promise.resolve(x2);
+>Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.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, --, --))
+>resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
+>x2 : Symbol(x2, Decl(promiseType.ts, 219, 13))
+
+// #30390
+
+declare function f1(): Promise<number> | string;
+>f1 : Symbol(f1, Decl(promiseType.ts, 227, 20))
+>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, --, --))
+
+p.then(f1);
+>p.then : Symbol(Promise.then, Decl(lib.es5.d.ts, --, --))
+>p : Symbol(p, Decl(promiseType.ts, 0, 11))
+>then : Symbol(Promise.then, Decl(lib.es5.d.ts, --, --))
+>f1 : Symbol(f1, Decl(promiseType.ts, 227, 20))
+
+// #33062
+
+declare function f2(resolve: (value: Promise<number> | string) => void);
+>f2 : Symbol(f2, Decl(promiseType.ts, 232, 11))
+>resolve : Symbol(resolve, Decl(promiseType.ts, 236, 20))
+>value : Symbol(value, Decl(promiseType.ts, 236, 30))
+>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, --, --))
+
+new Promise(f2);
+>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, --, --))
+>f2 : Symbol(f2, Decl(promiseType.ts, 232, 11))
+
diff --git a/tests/baselines/reference/promiseType.types b/tests/baselines/reference/promiseType.types
index e0580f999033d..ffdb57aac2de4 100644
--- a/tests/baselines/reference/promiseType.types
+++ b/tests/baselines/reference/promiseType.types
@@ -1583,3 +1583,49 @@ const pc9 = p.then(() => Promise.reject("1"), () => Promise.reject(1));
 >reject : <T = never>(reason?: any) => Promise<T>
 >1 : 1
 
+declare const x2: Promise<number> | string;
+>x2 : string | Promise<number>
+
+// #28427
+
+Promise.all([x2]);
+>Promise.all([x2]) : Promise<(string | number)[]>
+>Promise.all : { <TAll>(values: Iterable<TAll>): Promise<(TAll extends PromiseLike<infer UAll> ? UAll : TAll)[]>; <T extends readonly [any, any, any, any, any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly any[]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
+>Promise : PromiseConstructor
+>all : { <TAll>(values: Iterable<TAll>): Promise<(TAll extends PromiseLike<infer UAll> ? UAll : TAll)[]>; <T extends readonly [any, any, any, any, any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly [any, any]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; <T extends readonly any[]>(values: T): Promise<{ -readonly [P in keyof T]: Awaited<T[P]>; }>; }
+>[x2] : (string | Promise<number>)[]
+>x2 : string | Promise<number>
+
+// #33074
+
+Promise.resolve(x2);
+>Promise.resolve(x2) : Promise<string | number>
+>Promise.resolve : { <T>(value: T): Promise<Awaited<T>>; (): Promise<void>; }
+>Promise : PromiseConstructor
+>resolve : { <T>(value: T): Promise<Awaited<T>>; (): Promise<void>; }
+>x2 : string | Promise<number>
+
+// #30390
+
+declare function f1(): Promise<number> | string;
+>f1 : () => string | Promise<number>
+
+p.then(f1);
+>p.then(f1) : Promise<string | number>
+>p.then : <TResult1 = boolean, TResult2 = never>(onfulfilled?: (value: boolean) => TResult1, onrejected?: (reason: any) => TResult2) => Promise<(TResult1 extends PromiseLike<infer UResult1> ? UResult1 : TResult1) | (TResult2 extends PromiseLike<infer UResult2> ? UResult2 : TResult2)>
+>p : Promise<boolean>
+>then : <TResult1 = boolean, TResult2 = never>(onfulfilled?: (value: boolean) => TResult1, onrejected?: (reason: any) => TResult2) => Promise<(TResult1 extends PromiseLike<infer UResult1> ? UResult1 : TResult1) | (TResult2 extends PromiseLike<infer UResult2> ? UResult2 : TResult2)>
+>f1 : () => string | Promise<number>
+
+// #33062
+
+declare function f2(resolve: (value: Promise<number> | string) => void);
+>f2 : (resolve: (value: string | Promise<number>) => void) => any
+>resolve : (value: string | Promise<number>) => void
+>value : string | Promise<number>
+
+new Promise(f2);
+>new Promise(f2) : Promise<string | number>
+>Promise : PromiseConstructor
+>f2 : (resolve: (value: string | Promise<number>) => void) => any
+
diff --git a/tests/cases/compiler/promiseType.ts b/tests/cases/compiler/promiseType.ts
index ba4a7f6041396..e131bddfba8d1 100644
--- a/tests/cases/compiler/promiseType.ts
+++ b/tests/cases/compiler/promiseType.ts
@@ -217,3 +217,23 @@ const pc6 = p.then(() => Promise.reject("1"), () => {});
 const pc7 = p.then(() => Promise.reject("1"), () => {throw 1});
 const pc8 = p.then(() => Promise.reject("1"), () => Promise.resolve(1));
 const pc9 = p.then(() => Promise.reject("1"), () => Promise.reject(1));
+
+declare const x2: Promise<number> | string;
+
+// #28427
+
+Promise.all([x2]);
+
+// #33074
+
+Promise.resolve(x2);
+
+// #30390
+
+declare function f1(): Promise<number> | string;
+p.then(f1);
+
+// #33062
+
+declare function f2(resolve: (value: Promise<number> | string) => void);
+new Promise(f2);