There is no mistake when using a value that falls outside of a TypeScript

Expecting to encounter a compile time error with this code, but it seems my understanding of enums is off...

enum SortDirection {
    ascending = 1,
    descending = -1
}
type IndexSpec = {[index: string]: SortDirection};

var i: IndexSpec = {thing: 3};  // Did not generate a compile time error as anticipated

Answer №1

Every numerical value is classified as a value enum.

There is no differentiation between flag and non-flag enums, hence this is permitted:

enum MyValues {
  Up = 0x1,
  Down = 0x2,
  Left = 0x4
}

var num: MyValues = 6; // Up | Left

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