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convert compose to typescript #3532

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Aug 29, 2019
Merged

convert compose to typescript #3532

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7 changes: 4 additions & 3 deletions src/compose.js → src/compose.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,14 +9,15 @@
* (...args) => f(g(h(...args))).
*/

export default function compose(...funcs) {
export default function compose(...funcs: Function[]) {
if (funcs.length === 0) {
return arg => arg
// infer the argument type so it is usable in inference down the line
return <T>(arg: T) => arg
}

if (funcs.length === 1) {
return funcs[0]
}

return funcs.reduce((a, b) => (...args) => a(b(...args)))
return funcs.reduce((a, b) => (...args: any) => a(b(...args)))
}