enum values with indexOf or includes doesn't work properly.

[ashr81]

TypeScript Version: 4.0.2

Search Terms:
indexOf or includes with enum

Code

enum TABLE_COLUMN {
    TEXT = 'TEXT'
}
type tableColumnType = keyof typeof TABLE_COLUMN;
const colType: tableColumnType = 'TEXT';
console.log(Object.values(TABLE_COLUMN).indexOf(colType)) //Argument of type '"TEXT"' is not assignable to parameter of type 'TABLE_COLUMN'.

Expected behavior:
Should correct take the union type and not throw any error.

Actual behavior:
Throws error when trying to find the value.

Playground Link: Link to playground here

Related Issues:

[andrewbranch]

Duplicate of #17690, though maybe not obviously so. String enum values are opaque types. Even though your key and your value have the same literal text ("TEXT"), "TEXT" is not assignable to TABLE_COLUMN.TEXT. So you can’t ask if the values of TABLE_COLUMN contains a string literal—you can only ask if they contain a particular TABLE_COLUMN.

[rohansinghrawat99]

Hey @ashr81 hope u are doing good!
I might not have exactly understand what u wanted to from the above code but I tried to resolve the error by trying change it a bit. The output to the last line that is console log should I think be 0. If u wish u can assign me the issue!

[ashr81]

Hey @rohansinghrawat99 , Thanks for the help.
The issue is not with the output. It is with the type error I am seeing on the file when using the array indexOf method.

[rohansinghrawat99]

Hey @ashr81 Actually I wanted to say that the type of argument that Object.values().indexOf() is looking for won't be a string.... Instead of using that I would suggest you to use indexOf(TABLE_COLUMN[colType]). This would give u the desired result.

[ashr81]

Hey @rohansinghrawat99
Cool. Another approach in my case, where I want to just check the presence of a value in enum here is

console.log(colType in TABLE_COLUMN)