ts-enum-mapper

ts-enum-mapper
==============

ts-enum-mapper makes it easy to have one-to-one relationships between an enum and a set of values.

I.e. instead of an exhaustive switch with a case-per-value and an assertNever, you can do one-line-per-value and still get the benefits of type-checking (because the compiler will enforce that your mapping definition has a key for each enum value):

``typescript
enum Color {
Red = 'RED',
Blue = 'BLUE',
Green = 'GREEN',
}

const mapping = mapEnum(Color, {
Red: 'red!',
Blue: 'blue!',
Green: 'green!',
});

expect(mapping.map(Color.Red)).toEqual('red!');
expect(mapping.parse('red!')).toEqual(Color.Red);
`

Instead of the more traditional:

`typescript
function mapColor(color: Color) {
switch (color) {
case Color.Red:
return 'red!';
case Color.Blue:
return 'blue!';
case Color.Green:
return 'green!';
default:
return assertNever(color);
}
}
``