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jamesseanwright/variadic-kinds.ts

Last active June 18, 2020 10:38
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Example of variadic kinds in TypeScript, landing in version 4.0
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variadic-kinds.ts
const concat = <...TInput, ...TItems>(
input: ...TInput,
...appendees: ...TItems,
): [...TInput, ...TItems] => [...input, ...appendees];
const x = concat([1, 2], '3', { no: 4 }); // [1, 2, '3', { no: 4 }]
typeof x; // [number, number, string, { no: number }]
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