enum ENUM_POSITION_TYPE {
LEFT = 1,
RIGHT = 2
}
// type PositionType = 1 | 2
type PositionType = ???
export let a1: PositionType = ENUM_POSITION_TYPE.RIGHT //correct
export let a2: PositionType = 1 as const //correct
export let a3: PositionType = 3 //typescript error
I prefer not to have the type definition explicitly in my code like type PositionType = 1 | 2. I want to avoid having to manually update the type when adding new values to the enum.
When dealing with Enum values in TypeScript, it's important to note that the language doesn't keep track of their specific literal types. This lack of strict typing becomes evident when code like the following example does not result in a type error:
let x: typeof ENUM_POSITION_TYPE["LEFT"] = 3;
To address this issue, I suggest using the approach outlined below:
const ENUM_POSITION_TYPE = {
LEFT: 1,
RIGHT: 2
} as const;
type PositionType = typeof ENUM_POSITION_TYPE[keyof typeof ENUM_POSITION_TYPE];
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