1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
import {lens, assoc, lensProp, view, lensIndex, lensPath} from 'rambda'
interface Input {  foo: string,}const testObject: Input = {  foo: 'Jazz',}
describe('R.lens', () => {  it('happy', () => {    const fn = lens<Input, string>((x: Input) => {      x.foo // $ExpectType string      return x.foo    }, assoc('name'))    fn // $ExpectType Lens<Input, string>  })})
describe('R.lensProp', () => {  it('happy', () => {    const result = view<Input, string>(lensProp('foo'), testObject)    result // $ExpectType string  })})
describe('R.lensIndex', () => {  const testList: Input[] = [{foo: 'bar'}, {foo: 'baz'}]  it('happy', () => {    const result = view<Input[], Input>(lensIndex(0), testList)    result // $ExpectType Input    result.foo // $ExpectType string  })})
describe('R.lensPath', () => {  const path = lensPath(['bar', 'a'])  it('happy', () => {    const result = view<Input, string>(path, testObject)    result // $ExpectType string  })})
describe('R.view', () => {  const fooLens = lens<Input, string>((x: Input) => {    return x.foo  }, assoc('foo'))  it('happt', () => {    const result = view<Input, string>(fooLens, testObject)    result // $ExpectType string  })})