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
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
import { StrictMode, Suspense, useEffect } from 'react'import { fireEvent, render } from '@testing-library/react'import { Atom, atom, useAtomValue, useSetAtom } from 'jotai'import { loadable } from 'jotai/utils'import { getTestProvider } from '../testUtils'
const Provider = getTestProvider()
it('loadable turns suspense into values', async () => {  let resolveAsync!: (x: number) => void  const asyncAtom = atom(() => {    return new Promise<number>((resolve) => (resolveAsync = resolve))  })
  const { findByText } = render(    <StrictMode>      <Provider>        <LoadableComponent asyncAtom={asyncAtom} />      </Provider>    </StrictMode>  )
  await findByText('Loading...')  resolveAsync(5)  await findByText('Data: 5')})
it('loadable turns errors into values', async () => {  let rejectAsync!: (error: unknown) => void  const asyncAtom = atom(() => {    return new Promise<number>((_resolve, reject) => (rejectAsync = reject))  })
  const { findByText } = render(    <StrictMode>      <Provider>        <LoadableComponent asyncAtom={asyncAtom} />      </Provider>    </StrictMode>  )
  await findByText('Loading...')  rejectAsync(new Error('An error occurred'))  await findByText('Error: An error occurred')})
it('loadable turns primitive throws into values', async () => {  let rejectAsync!: (error: unknown) => void  const asyncAtom = atom(() => {    return new Promise<number>((_resolve, reject) => (rejectAsync = reject))  })
  const { findByText } = render(    <StrictMode>      <Provider>        <LoadableComponent asyncAtom={asyncAtom} />      </Provider>    </StrictMode>  )
  await findByText('Loading...')  rejectAsync('An error occurred')  await findByText('An error occurred')})
it('loadable goes back to loading after re-fetch', async () => {  let resolveAsync!: (x: number) => void  const refreshAtom = atom(0)  const asyncAtom = atom((get) => {    get(refreshAtom)    return new Promise<number>((resolve) => (resolveAsync = resolve))  })
  const Refresh = () => {    const setRefresh = useSetAtom(refreshAtom)    return (      <>        <button onClick={() => setRefresh((value) => value + 1)}>          refresh        </button>      </>    )  }
  const { findByText, getByText } = render(    <StrictMode>      <Provider>        <Refresh />        <LoadableComponent asyncAtom={asyncAtom} />      </Provider>    </StrictMode>  )
  getByText('Loading...')  resolveAsync(5)  await findByText('Data: 5')  fireEvent.click(getByText('refresh'))  await findByText('Loading...')  resolveAsync(6)  await findByText('Data: 6')})
it('loadable can recover from error', async () => {  let resolveAsync!: (x: number) => void  let rejectAsync!: (error: unknown) => void  const refreshAtom = atom(0)  const asyncAtom = atom((get) => {    get(refreshAtom)    return new Promise<number>((resolve, reject) => {      resolveAsync = resolve      rejectAsync = reject    })  })
  const Refresh = () => {    const setRefresh = useSetAtom(refreshAtom)    return (      <>        <button onClick={() => setRefresh((value) => value + 1)}>          refresh        </button>      </>    )  }
  const { findByText, getByText } = render(    <StrictMode>      <Provider>        <Refresh />        <LoadableComponent asyncAtom={asyncAtom} />      </Provider>    </StrictMode>  )
  getByText('Loading...')  rejectAsync(new Error('An error occurred'))  await findByText('Error: An error occurred')  fireEvent.click(getByText('refresh'))  await findByText('Loading...')  resolveAsync(6)  await findByText('Data: 6')})
it('loadable immediately resolves sync values', async () => {  const syncAtom = atom(5)  const effectCallback = jest.fn()
  const { getByText } = render(    <StrictMode>      <Provider>        <LoadableComponent          effectCallback={effectCallback}          asyncAtom={syncAtom}        />      </Provider>    </StrictMode>  )
  getByText('Data: 5')  expect(effectCallback.mock.calls).not.toContain(    expect.objectContaining({ state: 'loading' })  )  expect(effectCallback).toHaveBeenLastCalledWith({ state: 'hasData', data: 5 })})
it('loadable can use resolved promises syncronously', async () => {  const asyncAtom = atom(Promise.resolve(5))  const effectCallback = jest.fn()
  const ResolveAtomComponent = () => {    useAtomValue(asyncAtom)
    return <div>Ready</div>  }
  const { getByText, findByText, rerender } = render(    <StrictMode>      <Provider>        <Suspense fallback={null}>          <ResolveAtomComponent />        </Suspense>      </Provider>    </StrictMode>  )
  await findByText('Ready')
  rerender(    <StrictMode>      <Provider>        <LoadableComponent          effectCallback={effectCallback}          asyncAtom={asyncAtom}        />      </Provider>    </StrictMode>  )  getByText('Data: 5')
  expect(effectCallback.mock.calls).not.toContain(    expect.objectContaining({ state: 'loading' })  )  expect(effectCallback).toHaveBeenLastCalledWith({ state: 'hasData', data: 5 })})
it('loadable of a derived async atom does not trigger infinite loop (#1114)', async () => {  let resolveAsync!: (x: number) => void  const baseAtom = atom(0)  const asyncAtom = atom((get) => {    get(baseAtom)    return new Promise<number>((resolve) => (resolveAsync = resolve))  })
  const Trigger = () => {    const trigger = useSetAtom(baseAtom)    return (      <>        <button onClick={() => trigger((value) => value)}>trigger</button>      </>    )  }
  const { findByText, getByText } = render(    <StrictMode>      <Provider>        <Trigger />        <LoadableComponent asyncAtom={asyncAtom} />      </Provider>    </StrictMode>  )
  getByText('Loading...')  fireEvent.click(getByText('trigger'))  await new Promise((r) => setTimeout(r, 100))  resolveAsync(5)  await findByText('Data: 5')})
it('loadable of a derived async atom with error does not trigger infinite loop (#1330)', async () => {  const baseAtom = atom(() => {    throw new Error('thrown in baseAtom')  })  const asyncAtom = atom(async (get) => {    get(baseAtom)    return ''  })
  const { findByText, getByText } = render(    <StrictMode>      <Provider>        <LoadableComponent asyncAtom={asyncAtom} />      </Provider>    </StrictMode>  )
  getByText('Loading...')  await findByText('Error: thrown in baseAtom')})
type LoadableComponentProps = {  asyncAtom: Atom<Promise<number> | Promise<string> | string | number>  effectCallback?: (loadableValue: any) => void}
const LoadableComponent = ({  asyncAtom,  effectCallback,}: LoadableComponentProps) => {  const value = useAtomValue(loadable(asyncAtom))
  useEffect(() => {    if (effectCallback) {      effectCallback(value)    }  }, [value, effectCallback])
  if (value.state === 'loading') {    return <>Loading...</>  }
  if (value.state === 'hasError') {    return <>{String(value.error)}</>  }
  // this is to ensure correct typing  const data: number | string = value.data
  return <>Data: {data}</>}