Skip to content

Commit

Permalink
react-hooks/rules-of-hooks: Add support for do/while loops (#28714)
Browse files Browse the repository at this point in the history
<!--
  Thanks for submitting a pull request!
We appreciate you spending the time to work on these changes. Please
provide enough information so that others can review your pull request.
The three fields below are mandatory.

Before submitting a pull request, please make sure the following is
done:

1. Fork [the repository](https://github.com/facebook/react) and create
your branch from `main`.
  2. Run `yarn` in the repository root.
3. If you've fixed a bug or added code that should be tested, add tests!
4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch
TestName` is helpful in development.
5. Run `yarn test --prod` to test in the production environment. It
supports the same options as `yarn test`.
6. If you need a debugger, run `yarn test --debug --watch TestName`,
open `chrome://inspect`, and press "Inspect".
7. Format your code with
[prettier](https://github.com/prettier/prettier) (`yarn prettier`).
8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only
check changed files.
  9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`).
  10. If you haven't already, complete the CLA.

Learn more about contributing:
https://reactjs.org/docs/how-to-contribute.html
-->

## Summary

<!--
Explain the **motivation** for making this change. What existing problem
does the pull request solve?
-->

Currently, `react-hooks/rules-of-hooks` does not support `do/while`
loops - I've also reported this in
#28713.

This PR takes a stab at adding support for `do/while` by following the
same logic we already have for detecting `while` loops.

After this PR, any hooks called inside a `do/while` loop will be
considered invalid.

We're also adding some unit tests to confirm that the behavior is
working as expected.

Fixes #28713.

## How did you test this change?

<!--
Demonstrate the code is solid. Example: The exact commands you ran and
their output, screenshots / videos if the pull request changes the user
interface.
How exactly did you verify that your PR solves the issue you wanted to
solve?
  If you leave this empty, your PR will very likely be closed.
-->

I've added unit tests that cover the case and verified that they pass by
running:

```
yarn test packages/eslint-plugin-react-hooks/__tests__/ESLintRulesOfHooks-test.js --watch
```

I've also verified that the rest of the tests continue to pass by
running:

```
yarn test
```

and

```
yarn test --prod
```
  • Loading branch information
tyxla authored Oct 22, 2024
1 parent ae90522 commit 9daabc0
Show file tree
Hide file tree
Showing 2 changed files with 64 additions and 1 deletion.
Original file line number Diff line number Diff line change
Expand Up @@ -755,6 +755,30 @@ const tests = {
`,
errors: [loopError('useHookInsideLoop')],
},
{
code: normalizeIndent`
// Invalid because it's dangerous and might not warn otherwise.
// This *must* be invalid.
function ComponentWithHookInsideLoop() {
do {
useHookInsideLoop();
} while (cond);
}
`,
errors: [loopError('useHookInsideLoop')],
},
{
code: normalizeIndent`
// Invalid because it's dangerous and might not warn otherwise.
// This *must* be invalid.
function ComponentWithHookInsideLoop() {
do {
foo();
} while (useHookInsideLoop());
}
`,
errors: [loopError('useHookInsideLoop')],
},
{
code: normalizeIndent`
// Invalid because it's dangerous and might not warn otherwise.
Expand Down Expand Up @@ -853,6 +877,45 @@ const tests = {
`,
errors: [loopError('useHook1'), loopError('useHook2', true)],
},
{
code: normalizeIndent`
// Invalid because it's dangerous and might not warn otherwise.
// This *must* be invalid.
function useHookInLoops() {
do {
useHook1();
if (a) return;
useHook2();
} while (b);
do {
useHook3();
if (c) return;
useHook4();
} while (d)
}
`,
errors: [
loopError('useHook1'),
loopError('useHook2'),
loopError('useHook3'),
loopError('useHook4'),
],
},
{
code: normalizeIndent`
// Invalid because it's dangerous and might not warn otherwise.
// This *must* be invalid.
function useHookInLoops() {
do {
useHook1();
if (a) continue;
useHook2();
} while (b);
}
`,
errors: [loopError('useHook1'), loopError('useHook2', true)],
},
{
code: normalizeIndent`
// Invalid because it's dangerous and might not warn otherwise.
Expand Down
2 changes: 1 addition & 1 deletion packages/eslint-plugin-react-hooks/src/RulesOfHooks.js
Original file line number Diff line number Diff line change
Expand Up @@ -295,7 +295,7 @@ export default {
if (pathList.has(segment.id)) {
const pathArray = Array.from(pathList);
const cyclicSegments = pathArray.slice(
pathArray.indexOf(segment.id) + 1,
pathArray.indexOf(segment.id) - 1,
);
for (const cyclicSegment of cyclicSegments) {
cyclic.add(cyclicSegment);
Expand Down

0 comments on commit 9daabc0

Please sign in to comment.