Generator of Curried function types for index.js.flow

curried-flow-generator.js

const g = n => {
  const array = Array.from(Array(n), (_, i) => i + 1);
  const indices = Array.from(Array(n + 1), (_, i) => i);

  const returnF = k => {
    const types = array.slice(k).map(t => `T${t}`);
    return types.length === 0 
      ? 'R' 
      : `CurriedFunction${n - k}<${types.join(', ')}, R>`;
  }

  const params = k => {
    const types = array.slice(0, k).map(t => `T${t}`);
    return types.length === 0 
      ? '()'
      : `(...params: [${types.join(', ')}])`;
  }

  return `
    export type ${returnF(0)} =
      ${indices.map(i => {
        return `(${params(i)} => ${returnF(i)})`;
      }).join(' &\n      ')};`
}

for (let i = 1; i <= 10; i++) {
  console.log(g(i));
}