Object literals allow duplicate [Enum.member]: ... keys

[pushkine]

Bug Report

🕗 Version & Regression Information

ts stable & nightly

⏯ Playground Link

Playground Link

💻 Code

const x = {
    [1]: 2,
    [1]: 2,
//  ^^^ ERROR: An object literal cannot have multiple properties with the same name. (1117)
};

enum Enum { foo = 1, }

const y = {
    [Enum.foo]: 2,
    [Enum.foo]: 2,
//  ^^^^^^^^^^ No Error
};

🙁 Actual behavior

Defining an object literal with duplicate keys throws an error for literal 1 but not for enum member Enum.foo

🙂 Expected behavior

Defining an object with duplicate keys from enum members throws an error

    [Enum.foo]: 2,
    [Enum.foo]: 2,
//  ^^^^^^^^^^ An object literal cannot have multiple properties with the same name

[Andrew-Martin1]

Note: This issue isn't specific to enums, it happens with string variables as well

const myString = "foo";

const y = {
    [myString]: 1,
    [myString]: 2,
//  ^^^^^^^^^^ No Error
};

Edit: it looks like this might be intentional as part of ECMAscript implementation https://stackoverflow.com/a/30617831

[nnguyen01]

Is this released yet? Still seeing the error

const myString = "foo";

const y = {
    [myString]: 1,
    [myString]: 2,
//  ^^^^^^^^^^ No Error
};