CODEWITHSUNDEEP
typescript
CookieEater
CookieEater

Reputation: 2496

Pick from union type string

I have a union type, and I'd like to pick certain values from the union type. Is this possible? I've tried to use 'Pick', but this doesn't work on the union type.

e.g.

type FooType = 'foo' | 'bar' | 'baz';
type Extracted = : Pick<FooType, 'foo' | 'bar'>; // should contains only 'foo' and 'bar'

I've now tried various strategies, but cannot get this to work.

Upvotes: 18

Views: 6428

Answers (1)

mightimaus
mightimaus

Reputation: 1089

Try using Extract instead of Pick:

type FooType = 'foo' | 'bar' | 'baz';
type Extracted = Extract<FooType, 'foo' | 'bar'>;
// type Extracted = 'foo' | 'bar'

Upvotes: 25

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