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Type of heterogeneous enum value can't be inferred correctly when used in object literal #33439
Description
TypeScript Version: 3.5.3
Search Terms:
heterogeneous enum value type
Code
const enum Heterogeneous {
Foo = 1,
Bar = 'zzz',
}
var a1: string = Heterogeneous.Bar; // <= OK. no error.
var a2: {name: string} = {name: Heterogeneous.Bar}; // <= Type 'Heterogeneous' is not assignable to type 'string'.
var b1: Heterogeneous = Heterogeneous.Bar; // Type of 'b1' is 'Heterogeneous'.
var b2 = {name: b1}; // Type of 'b2' is still inferred as '{name: Heterogeneous.Bar;}'
var b3: {name: string} = {name: b1}; // OK. 'Heterogeneous.Bar' is assignable to 'string'.Expected behavior:
no error.
Actual behavior:
var a2: {name: string} = {name: Constants.Bar}; // <= Type 'Constants' is not assignable to type 'string'.ts(2322)
I often use a heterogeneous const enum as a constant provider, for compile time optimizing.
Specifying the string type literal explicitly will work, like:
var a2: {name: string} = {name: <string>Heterogeneous.Bar};
but it looks verbose.
Activity
[-]Type of heterogeneous enum value can't be infered when used in object literal[/-][+]Type of heterogeneous enum value can't be inferred correctly when used in object literal[/+]