Generator of Curried function interface for index.d.ts

curried-ts-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${t}: T${t}`);
    return `(${types.join(', ')})`;
  }

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

for (let i = 1; i <= 20; i++) {
  console.log(g(i));
}