Is there a way to require the 'foo' literal, while allowing the array to have any shape (i.e. not using an X-length tuple with pre-defined positions)?
type requireFoo = ???
const works: requireFoo = ['bar','foo'] //This should work
const notWork: requireFoo = ['tar', 'bar'] //This should not work
This particular demand seems rather peculiar. If the requirement is for 'foo' to be at the beginning or end of the tuple, you can achieve it like this:
type requireFoo = [...any[], 'foo']
const meetsRequirement: requireFoo = ['bar', 'foo' as const] // Satisfactory
const doesNotMeetRequirement: requireFoo = ['tar', 'bar' as const] // Unacceptable
Please note that rest arguments at the beginning of a tuple, as demonstrated above, are only supported in TypeScript 4.2 beta.
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