I have a tuple with multiple objects stored in it.
const repos = [
{ name: 'react', type: 'JS' },
{ name: 'angular', type: 'TS' },
] as const
const RepoTypes = typeof repos
const jsRepoTypes = FilterRepos<'JS'> // Expected to filter and return only the JS type object
I am interested in a generic Utility Type ( FilterRepos<T> ) where I can input the type parameter and receive the filtered tuple type.
Utilizing a tail-recursive method, we can effectively create a tuple by selectively removing tuple elements that do not match the specified criteria.
type FilteredTuples<
T extends string,
TUPLES extends readonly any[] = typeof tuples
> =
TUPLES extends readonly [infer L, ...infer R]
? L extends { type: T }
? [L, ...FilteredTuples<T, R>]
: FilteredTuples<T, R>
: []
type TypescriptRepoTypes = FilteredTuples<'typescript'>
// type TypescriptRepoTypes = [{
// readonly name: "angular";
// readonly type: "typescript";
// }, {
// readonly name: "react";
// readonly type: "typescript";
// }]
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