String literal type in computed property of object literal doesn't validate type

[greg-hornby-roam]

TypeScript Version: 2.3.2

In my project we generate an object of fields per database model, with each field cast to a string literal of the field name. We also generate an interface to map the field names to types.

In this example I wrote up, a User has fields "name" and "favColor", "name" is simply a string, and "favColor" is an enum of red,green,blue.

In example 1.2 when we try to assign "yellow" to "favColor" typescript correctly errors as yellow is not assignable to the enum.

However in example 2.2, doing a similar thing, but as a computer property in the object literal, it does not correctly error when trying to assign "yellow" to "favColor"

Code

var UserFields = {
    "name": <"name">"name",
    "favColor": <"favColor">"favColor"
};

interface UserInterface {
    name: string;
    favColor: "red" | "green" | "blue"
}


//Example 1

var newUser: Partial<UserInterface> = {};
//Example 1.1 - Expect: valid, result: valid - Correct
newUser[UserFields.favColor] = "red";
//Example 1.2 - Expect: invalid, result: invalid - Correct
newUser[UserFields.favColor] = "yellow";



//Example 2
//Example 2.1 - Expect: valid, result: valid - Correct
var newUser: Partial<UserInterface> = {
    [UserFields.favColor]: "red"
}

//Example 2.2 - Expect: invalid, result: valid - Incorrect
var newUser: Partial<UserInterface> = {
    [UserFields.favColor]: "yellow"
}

http://www.typescriptlang.org/play/index.html#src=var%20UserFields%20%3D%20%7B%0A%20%20%20%20%22name%22%3A%20%3C%22name%22%3E%22name%22%2C%0A%20%20%20%20%22favColor%22%3A%20%3C%22favColor%22%3E%22favColor%22%0A%7D%3B%0A%0Ainterface%20UserInterface%20%7B%0A%20%20%20%20name%3A%20string%3B%0A%20%20%20%20favColor%3A%20%22red%22%20%7C%20%22green%22%20%7C%20%22blue%22%0A%7D%0A%0A%0A%2F%2FExample%201%0A%0Avar%20newUser%3A%20Partial%3CUserInterface%3E%20%3D%20%7B%7D%3B%0A%2F%2FExample%201.1%20-%20Expect%3A%20valid%2C%20result%3A%20valid%20-%20Correct%0AnewUser%5BUserFields.favColor%5D%20%3D%20%22red%22%3B%0A%2F%2FExample%201.2%20-%20Expect%3A%20invalid%2C%20result%3A%20invalid%20-%20Correct%0AnewUser%5BUserFields.favColor%5D%20%3D%20%22yellow%22%3B%0A%0A%0A%0A%2F%2FExample%202%0A%2F%2FExample%202.1%20-%20Expect%3A%20valid%2C%20result%3A%20valid%20-%20Correct%0Avar%20newUser%3A%20Partial%3CUserInterface%3E%20%3D%20%7B%0A%20%20%20%20%5BUserFields.favColor%5D%3A%20%22red%22%0A%7D%0A%0A%2F%2FExample%202.2%20-%20Expect%3A%20invalid%2C%20result%3A%20valid%20-%20Incorrect%0Avar%20newUser%3A%20Partial%3CUserInterface%3E%20%3D%20%7B%0A%20%20%20%20%5BUserFields.favColor%5D%3A%20%22yellow%22%0A%7D

[Roam-Cooper]

👍

[mhegazy]

looks like a duplicate of #16687

[mhegazy]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.