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import arityN from 'arity-n'; let compose2 = (f, g) => (...args) => f(g(...args)); export default function compose(...functions) { const funcs = functions.filter(fn => typeof fn === 'function'); let lastIdx = funcs.length - 1; let arity = 0; if (funcs.length <= 0) { throw new Error('No funcs passed'); } if (lastIdx >= 0 && funcs[lastIdx]) { arity = funcs[lastIdx].length; } return arityN(funcs.reduce(compose2), arity); }
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