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Modify Provider to keep the latest flags even when it is remounted #238

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Modify Provider to keep the latest flags even when it is remounted #238

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f5f59d3
Modify Provider to keep the latest flags even when it is remounted
bufferings Feb 14, 2024
eac2c24
Remove empty lines.
bufferings Mar 15, 2024
1456bb3
Update src/asyncWithLDProvider.test.tsx
bufferings Mar 15, 2024
675931e
Remove redundant variables
bufferings Mar 15, 2024
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31 changes: 31 additions & 0 deletions src/asyncWithLDProvider.test.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -227,4 +227,35 @@ describe('asyncWithLDProvider', () => {

expect(receivedNode).toHaveTextContent('{"testFlag":false}');
});

test('Provider keeps the latest flags even when it is remounted', async () => {
mockInitLDClient.mockImplementation(() => ({
ldClient: mockLDClient,
flags: rawFlags,
}));

mockLDClient.on.mockImplementationOnce((e: string, cb: (c: LDFlagChangeset) => void) => {
cb({ 'test-flag': { current: false, previous: true }, 'another-test-flag': { current: false, previous: true } });
});
const options: LDOptions = {};

const LDProvider = await asyncWithLDProvider({ clientSideID, context, options });

const { getByText: getByText1, unmount } = render(
<LDProvider>
<Consumer>{(value) => <span>Received: {JSON.stringify(value.flags)}</span>}</Consumer>
</LDProvider>,
);
const receivedNode1 = getByText1(/^Received:/);
expect(receivedNode1).toHaveTextContent('{"testFlag":false,"anotherTestFlag":false}');
unmount();

const { getByText: getByText2 } = render(
<LDProvider>
<Consumer>{(value) => <span>Received: {JSON.stringify(value.flags)}</span>}</Consumer>
</LDProvider>,
);
const receivedNode2 = getByText2(/^Received:/);
expect(receivedNode2).toHaveTextContent('{"testFlag":false,"anotherTestFlag":false}');
});
});
6 changes: 4 additions & 2 deletions src/asyncWithLDProvider.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -41,11 +41,12 @@ export default async function asyncWithLDProvider(config: AsyncProviderConfig) {
);

const initialFlags = options?.bootstrap && options.bootstrap !== 'localStorage' ? options.bootstrap : fetchedFlags;
let currentFlags = initialFlags;

const LDProvider = ({ children }: { children: ReactNode }) => {
const [ldData, setLDData] = useState(() => ({
unproxiedFlags: initialFlags,
...getFlagsProxy(ldClient, initialFlags, reactOptions, targetFlags),
unproxiedFlags: currentFlags,
...getFlagsProxy(ldClient, currentFlags, reactOptions, targetFlags),
}));

useEffect(() => {
Expand All @@ -54,6 +55,7 @@ export default async function asyncWithLDProvider(config: AsyncProviderConfig) {
if (Object.keys(updates).length > 0) {
setLDData(({ unproxiedFlags }) => {
const updatedUnproxiedFlags = { ...unproxiedFlags, ...updates };
currentFlags = updatedUnproxiedFlags;

return {
unproxiedFlags: updatedUnproxiedFlags,
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