Add test case

Author: jakebailey

tests/baselines/reference/issue50680.errors.txt

@@ -0,0 +1,36 @@
+tests/cases/compiler/issue50680.ts(5,11): error TS2322: Type 'string' is not assignable to type '"aa" | "bb"'.
+tests/cases/compiler/issue50680.ts(13,11): error TS2322: Type 'string' is not assignable to type '"aa" | "bb"'.
+tests/cases/compiler/issue50680.ts(14,11): error TS2322: Type 'string[]' is not assignable to type '("aa" | "bb")[]'.
+  Type 'string' is not assignable to type '"aa" | "bb"'.
+
+
+==== tests/cases/compiler/issue50680.ts (3 errors) ====
+    declare function func<T extends string>(arg: { keys: T[] }): { readonly keys: T[]; readonly firstKey: T; };
+    
+    function func1() {
+        const { firstKey } = func({keys: ["aa", "bb"]})
+        const a: "aa" | "bb" = firstKey;
+              ~
+!!! error TS2322: Type 'string' is not assignable to type '"aa" | "bb"'.
+    
+        const { keys } = func({keys: ["aa", "bb"]})
+        const b: ("aa" | "bb")[] = keys;
+    }
+      
+    function func2() {
+        const { keys, firstKey } = func({keys: ["aa", "bb"]})
+        const a: "aa" | "bb" = firstKey;
+              ~
+!!! error TS2322: Type 'string' is not assignable to type '"aa" | "bb"'.
+        const b: ("aa" | "bb")[] = keys;
+              ~
+!!! error TS2322: Type 'string[]' is not assignable to type '("aa" | "bb")[]'.
+!!! error TS2322:   Type 'string' is not assignable to type '"aa" | "bb"'.
+    }
+    
+    function func3() {
+        const x = func({keys: ["aa", "bb"]})
+        const a: "aa" | "bb" = x.firstKey;
+        const b: ("aa" | "bb")[] = x.keys;
+    }
+    

tests/baselines/reference/issue50680.js

@@ -0,0 +1,41 @@
+//// [issue50680.ts]
+declare function func<T extends string>(arg: { keys: T[] }): { readonly keys: T[]; readonly firstKey: T; };
+
+function func1() {
+    const { firstKey } = func({keys: ["aa", "bb"]})
+    const a: "aa" | "bb" = firstKey;
+
+    const { keys } = func({keys: ["aa", "bb"]})
+    const b: ("aa" | "bb")[] = keys;
+}
+  
+function func2() {
+    const { keys, firstKey } = func({keys: ["aa", "bb"]})
+    const a: "aa" | "bb" = firstKey;
+    const b: ("aa" | "bb")[] = keys;
+}
+
+function func3() {
+    const x = func({keys: ["aa", "bb"]})
+    const a: "aa" | "bb" = x.firstKey;
+    const b: ("aa" | "bb")[] = x.keys;
+}
+
+
+//// [issue50680.js]
+function func1() {
+    var firstKey = func({ keys: ["aa", "bb"] }).firstKey;
+    var a = firstKey;
+    var keys = func({ keys: ["aa", "bb"] }).keys;
+    var b = keys;
+}
+function func2() {
+    var _a = func({ keys: ["aa", "bb"] }), keys = _a.keys, firstKey = _a.firstKey;
+    var a = firstKey;
+    var b = keys;
+}
+function func3() {
+    var x = func({ keys: ["aa", "bb"] });
+    var a = x.firstKey;
+    var b = x.keys;
+}

tests/baselines/reference/issue50680.symbols

@@ -0,0 +1,73 @@
+=== tests/cases/compiler/issue50680.ts ===
+declare function func<T extends string>(arg: { keys: T[] }): { readonly keys: T[]; readonly firstKey: T; };
+>func : Symbol(func, Decl(issue50680.ts, 0, 0))
+>T : Symbol(T, Decl(issue50680.ts, 0, 22))
+>arg : Symbol(arg, Decl(issue50680.ts, 0, 40))
+>keys : Symbol(keys, Decl(issue50680.ts, 0, 46))
+>T : Symbol(T, Decl(issue50680.ts, 0, 22))
+>keys : Symbol(keys, Decl(issue50680.ts, 0, 62))
+>T : Symbol(T, Decl(issue50680.ts, 0, 22))
+>firstKey : Symbol(firstKey, Decl(issue50680.ts, 0, 82))
+>T : Symbol(T, Decl(issue50680.ts, 0, 22))
+
+function func1() {
+>func1 : Symbol(func1, Decl(issue50680.ts, 0, 107))
+
+    const { firstKey } = func({keys: ["aa", "bb"]})
+>firstKey : Symbol(firstKey, Decl(issue50680.ts, 3, 11))
+>func : Symbol(func, Decl(issue50680.ts, 0, 0))
+>keys : Symbol(keys, Decl(issue50680.ts, 3, 31))
+
+    const a: "aa" | "bb" = firstKey;
+>a : Symbol(a, Decl(issue50680.ts, 4, 9))
+>firstKey : Symbol(firstKey, Decl(issue50680.ts, 3, 11))
+
+    const { keys } = func({keys: ["aa", "bb"]})
+>keys : Symbol(keys, Decl(issue50680.ts, 6, 11))
+>func : Symbol(func, Decl(issue50680.ts, 0, 0))
+>keys : Symbol(keys, Decl(issue50680.ts, 6, 27))
+
+    const b: ("aa" | "bb")[] = keys;
+>b : Symbol(b, Decl(issue50680.ts, 7, 9))
+>keys : Symbol(keys, Decl(issue50680.ts, 6, 11))
+}
+  
+function func2() {
+>func2 : Symbol(func2, Decl(issue50680.ts, 8, 1))
+
+    const { keys, firstKey } = func({keys: ["aa", "bb"]})
+>keys : Symbol(keys, Decl(issue50680.ts, 11, 11))
+>firstKey : Symbol(firstKey, Decl(issue50680.ts, 11, 17))
+>func : Symbol(func, Decl(issue50680.ts, 0, 0))
+>keys : Symbol(keys, Decl(issue50680.ts, 11, 37))
+
+    const a: "aa" | "bb" = firstKey;
+>a : Symbol(a, Decl(issue50680.ts, 12, 9))
+>firstKey : Symbol(firstKey, Decl(issue50680.ts, 11, 17))
+
+    const b: ("aa" | "bb")[] = keys;
+>b : Symbol(b, Decl(issue50680.ts, 13, 9))
+>keys : Symbol(keys, Decl(issue50680.ts, 11, 11))
+}
+
+function func3() {
+>func3 : Symbol(func3, Decl(issue50680.ts, 14, 1))
+
+    const x = func({keys: ["aa", "bb"]})
+>x : Symbol(x, Decl(issue50680.ts, 17, 9))
+>func : Symbol(func, Decl(issue50680.ts, 0, 0))
+>keys : Symbol(keys, Decl(issue50680.ts, 17, 20))
+
+    const a: "aa" | "bb" = x.firstKey;
+>a : Symbol(a, Decl(issue50680.ts, 18, 9))
+>x.firstKey : Symbol(firstKey, Decl(issue50680.ts, 0, 82))
+>x : Symbol(x, Decl(issue50680.ts, 17, 9))
+>firstKey : Symbol(firstKey, Decl(issue50680.ts, 0, 82))
+
+    const b: ("aa" | "bb")[] = x.keys;
+>b : Symbol(b, Decl(issue50680.ts, 19, 9))
+>x.keys : Symbol(keys, Decl(issue50680.ts, 0, 62))
+>x : Symbol(x, Decl(issue50680.ts, 17, 9))
+>keys : Symbol(keys, Decl(issue50680.ts, 0, 62))
+}
+

tests/baselines/reference/issue50680.types

@@ -0,0 +1,89 @@
+=== tests/cases/compiler/issue50680.ts ===
+declare function func<T extends string>(arg: { keys: T[] }): { readonly keys: T[]; readonly firstKey: T; };
+>func : <T extends string>(arg: {    keys: T[];}) => {    readonly keys: T[];    readonly firstKey: T;}
+>arg : { keys: T[]; }
+>keys : T[]
+>keys : T[]
+>firstKey : T
+
+function func1() {
+>func1 : () => void
+
+    const { firstKey } = func({keys: ["aa", "bb"]})
+>firstKey : string
+>func({keys: ["aa", "bb"]}) : { readonly keys: string[]; readonly firstKey: string; }
+>func : <T extends string>(arg: { keys: T[]; }) => { readonly keys: T[]; readonly firstKey: T; }
+>{keys: ["aa", "bb"]} : { keys: string[]; }
+>keys : string[]
+>["aa", "bb"] : string[]
+>"aa" : "aa"
+>"bb" : "bb"
+
+    const a: "aa" | "bb" = firstKey;
+>a : "aa" | "bb"
+>firstKey : string
+
+    const { keys } = func({keys: ["aa", "bb"]})
+>keys : ("aa" | "bb")[]
+>func({keys: ["aa", "bb"]}) : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
+>func : <T extends string>(arg: { keys: T[]; }) => { readonly keys: T[]; readonly firstKey: T; }
+>{keys: ["aa", "bb"]} : { keys: ("aa" | "bb")[]; }
+>keys : ("aa" | "bb")[]
+>["aa", "bb"] : ("aa" | "bb")[]
+>"aa" : "aa"
+>"bb" : "bb"
+
+    const b: ("aa" | "bb")[] = keys;
+>b : ("aa" | "bb")[]
+>keys : ("aa" | "bb")[]
+}
+  
+function func2() {
+>func2 : () => void
+
+    const { keys, firstKey } = func({keys: ["aa", "bb"]})
+>keys : string[]
+>firstKey : string
+>func({keys: ["aa", "bb"]}) : { readonly keys: string[]; readonly firstKey: string; }
+>func : <T extends string>(arg: { keys: T[]; }) => { readonly keys: T[]; readonly firstKey: T; }
+>{keys: ["aa", "bb"]} : { keys: string[]; }
+>keys : string[]
+>["aa", "bb"] : string[]
+>"aa" : "aa"
+>"bb" : "bb"
+
+    const a: "aa" | "bb" = firstKey;
+>a : "aa" | "bb"
+>firstKey : string
+
+    const b: ("aa" | "bb")[] = keys;
+>b : ("aa" | "bb")[]
+>keys : string[]
+}
+
+function func3() {
+>func3 : () => void
+
+    const x = func({keys: ["aa", "bb"]})
+>x : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
+>func({keys: ["aa", "bb"]}) : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
+>func : <T extends string>(arg: { keys: T[]; }) => { readonly keys: T[]; readonly firstKey: T; }
+>{keys: ["aa", "bb"]} : { keys: ("aa" | "bb")[]; }
+>keys : ("aa" | "bb")[]
+>["aa", "bb"] : ("aa" | "bb")[]
+>"aa" : "aa"
+>"bb" : "bb"
+
+    const a: "aa" | "bb" = x.firstKey;
+>a : "aa" | "bb"
+>x.firstKey : "aa" | "bb"
+>x : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
+>firstKey : "aa" | "bb"
+
+    const b: ("aa" | "bb")[] = x.keys;
+>b : ("aa" | "bb")[]
+>x.keys : ("aa" | "bb")[]
+>x : { readonly keys: ("aa" | "bb")[]; readonly firstKey: "aa" | "bb"; }
+>keys : ("aa" | "bb")[]
+}
+

tests/cases/compiler/issue50680.ts

@@ -0,0 +1,21 @@
+declare function func<T extends string>(arg: { keys: T[] }): { readonly keys: T[]; readonly firstKey: T; };
+
+function func1() {
+    const { firstKey } = func({keys: ["aa", "bb"]})
+    const a: "aa" | "bb" = firstKey;
+
+    const { keys } = func({keys: ["aa", "bb"]})
+    const b: ("aa" | "bb")[] = keys;
+}
+  
+function func2() {
+    const { keys, firstKey } = func({keys: ["aa", "bb"]})
+    const a: "aa" | "bb" = firstKey;
+    const b: ("aa" | "bb")[] = keys;
+}
+
+function func3() {
+    const x = func({keys: ["aa", "bb"]})
+    const a: "aa" | "bb" = x.firstKey;
+    const b: ("aa" | "bb")[] = x.keys;
+}