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import {applyDiff} from 'rambda'
interface Output {  a: {    b: number,    d: number,  },}
describe('R.applyDiff', () => {  it('happy', async() => {    const obj = {a: {b: 1, c: 2}}    const rules = [      {op: 'remove', path: 'a.c'} as const,      {op: 'add', path: 'a.d', value: 4} as const,      {op: 'update', path: 'a.b', value: 2} as const,    ]    const result = applyDiff<Output>(rules, obj)    result // $ExpectType Output  })})