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import {mapKeys} from 'rambda'
const obj = {  a: 1,  b: 2,}const changeKeyFn = (prop: string) => `${prop}_foo`
interface Output {  a_foo: string,  b_foo: string,}
describe('R.mapKeys', () => {  it('happy', () => {    const result = mapKeys<number, Output>(changeKeyFn, obj)
    result // $ExpectType Output  })  it('curried', () => {    const result = mapKeys<number, Output>(changeKeyFn)(obj)
    result // $ExpectType Output  })})