Suppose we have a scenario where an interface/type is defined as follows:
interface ITest {
abc: string[]
}
and then it is assigned to an object like this:
const obj: ITest = {
abc: ["x", "y", "z"]
}
We then attempt to create a type based on the values of the abc property...
type ABCVal = (typeof obj.abc)[number]As a result, ABCVal is simply string
Is there a way for ABCVal to be equal to "x" | "y" | "z" while still enforcing that the abc array can only contain strings?
If you want to achieve this, utilize the satisfies operator along with a const-assertion in this manner:
interface ITest {
abc: string[]
}
const obj = {
abc: ["x", "y", "z"]
} as const satisfies ITest;
type ABCVal = (typeof obj.abc)[number]
// ^? type ABCVal = "x" | "y" | "z"
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