feature-itunes-ticket-NA #207
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WalkthroughThis update introduces a new iTunes track search feature, including Redux state management, sagas, selectors, and a user interface with debounced search and audio playback. It adds supporting tests, a new route and translations, updates the theme and layout, and refactors API utilities for improved immutability. The iTunes API client and route configuration are also added. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant ITunesSearchComponent
participant ReduxStore
participant Saga
participant ITunesApi
participant SongCard
User->>ITunesSearchComponent: Types search query
ITunesSearchComponent->>ReduxStore: Dispatch SEARCH_TRACKS action
ReduxStore->>Saga: Notifies of SEARCH_TRACKS
Saga->>Saga: Debounce (300ms)
Saga->>ITunesApi: Call searchTracks(query)
ITunesApi-->>Saga: Returns track results
Saga->>ReduxStore: Dispatch SEARCH_TRACKS_SUCCESS with tracks
ReduxStore->>ITunesSearchComponent: Updates tracks state
ITunesSearchComponent->>SongCard: Renders track info and playback controls
User->>SongCard: Clicks play
SongCard->>SongCard: Plays audio preview
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Hello @SiddOnKeys, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
Summary of Changes
gemini-code-assist here to provide a summary of this pull request. This PR introduces the initial implementation of an iTunes track search feature. It sets up the necessary Redux state management (actions, constants, reducer, saga) to handle the search process, including loading states and errors. A dedicated API service using wretch is added to interact with the iTunes Search API. A new container component (ITunesSearch) provides the search interface with a debounced input for real-time searching. A SongCard component is created to display individual track results, although the rendering of these cards is currently commented out in the main container. The PR also includes comprehensive unit tests for the new Redux elements and the API service. Additionally, it makes some general updates to the application's theme and layout, adding a blurred background effect and refactoring some API utility functions. The PR description indicates this is a work in progress.
Highlights
- iTunes Search Feature: Adds a new feature allowing users to search for tracks on iTunes via a dedicated page at the
/itunesroute. - Redux Implementation: Introduces a new Redux module (
ITunesSearch) with actions, constants, a reducer, and a saga to manage the state and side effects of the iTunes search, including handling loading, errors, and search results. - iTunes API Service: Creates a new service (
itunesApi.js) using thewretchlibrary to make API calls to the iTunes Search endpoint. - Song Card Component: Adds a
SongCardcomponent (SongCard/index.js) designed to display individual track details (artwork, name, artist, genre) and provide a play/pause button for audio previews. - Debounced Search Input: Implements a debounced search input in the
ITunesSearchcontainer to prevent excessive API calls while the user is typing. - Unit Tests: Includes unit tests for the new Redux actions, reducer, saga, selectors, and the iTunes API service to ensure functionality and state management are working correctly.
- Theme and Layout Updates: Updates the main application theme (
App/index.js) with a dark mode palette and adds a blurred background effect and styled container to the main content area. TheHeadercomponent is removed from the main layout. - API Utility Refactor: Refactors utility functions in
apiUtils.jsrelated to generating API clients and transforming request bodies.
Changelog
Click here to see the changelog
- app/components/SongCard/index.js
- Added new
SongCardcomponent for displaying track details and handling audio playback.
- Added new
- app/containers/App/index.js
- Updated MUI theme with dark mode colors and component style overrides.
- Added
BlurredBackgroundandStyledContainercomponents for layout. - Wrapped main route content in new styled containers.
- Removed
Headercomponent from the main render tree.
- app/containers/ITunesSearch/actions.js
- Added Redux action creators for iTunes search:
searchTracks,searchTracksSuccess,searchTracksError,clearTracks.
- Added Redux action creators for iTunes search:
- app/containers/ITunesSearch/constants.js
- Added constants for iTunes search action types.
- app/containers/ITunesSearch/index.js
- Added the main
ITunesSearchcontainer component. - Implemented search input with debounce.
- Connected component to Redux state and dispatch actions.
- Added loading indicator and error message display.
- Included commented-out section for rendering track results using
SongCard.
- Added the main
- app/containers/ITunesSearch/loadable.js
- Added loadable component for lazy loading
ITunesSearch.
- Added loadable component for lazy loading
- app/containers/ITunesSearch/reducer.js
- Added Redux reducer for
itunesSearchstate, managing tracks, loading, error, and query.
- Added Redux reducer for
- app/containers/ITunesSearch/saga.js
- Added Redux saga to handle
SEARCH_TRACKSaction. - Implemented a 300ms delay for debouncing.
- Calls
itunesApi.searchTracksand dispatches success or error actions.
- Added Redux saga to handle
- app/containers/ITunesSearch/tests/index.test.js
- Added unit tests for the
ITunesSearchcomponent, covering rendering, input handling, and action dispatching.
- Added unit tests for the
- app/containers/ITunesSearch/tests/reducer.test.js
- Added unit tests for the
itunesSearchReducer, verifying state transitions for all action types.
- Added unit tests for the
- app/containers/ITunesSearch/tests/saga.test.js
- Added unit tests for the
searchTracksSaga, verifying delay, API call, and success/error handling.
- Added unit tests for the
- app/containers/ITunesSearch/tests/selectors.test.js
- Added unit tests for the
itunesSearchselectors.
- Added unit tests for the
- app/routeConfig.js
- Added a new route configuration entry for
/itunes.
- Added a new route configuration entry for
- app/services/itunesApi.js
- Added a new service file for interacting with the iTunes Search API using
wretch. - Includes
searchTracksfunction with query encoding and response transformation.
- Added a new service file for interacting with the iTunes Search API using
- app/services/tests/itunesApi.test.js
- Added unit tests for the
itunesApiservice.
- Added unit tests for the
- app/translations/en.json
- Added new translation key
search_tracks_error.
- Added new translation key
- app/utils/apiUtils.js
- Refactored
generateApiClientto useObject.assign. - Refactored
createApiClientWithTransFormto handle request body transformation more robustly.
- Refactored
- app/utils/routeConstants.js
- Added a new route constant entry for
itunes.
- Added a new route constant entry for
- package.json
- Added
huskydependency.
- Added
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Code Review
This pull request introduces a new feature for searching iTunes tracks, including UI components, Redux state management (actions, reducers, sagas, selectors), API service integration, and a new application theme. The code is generally well-structured and follows modern React/Redux practices.
Key additions include:
- A
SongCardcomponent for displaying track information and handling audio playback. - An
ITunesSearchcontainer that manages search input, displays results (currently WIP for rendering), and handles loading/error states. - A new dark theme with violet accents applied globally.
- Redux setup for managing iTunes search state and side effects.
- An API service layer for interacting with the iTunes API.
- Unit tests for most of the new Redux logic and some component/service aspects.
The PR description indicates this is a Work In Progress (WIP), which is noted. The feedback below focuses on areas that could lead to bugs, performance issues, or maintainability concerns, even in a WIP state.
Summary of Findings
- Event Listener Leak: In
SongCard/index.js, the 'ended' event listener for the audio element is not being properly removed on cleanup, which can lead to memory leaks and unexpected behavior. (Severity: High) - API Client Generation Logic: In
utils/apiUtils.js, thegenerateApiClientfunction's refactoring appears to break the client caching mechanism and uses a hardcoded base URL for all client types. (Severity: High) - Redundant Saga Delay: The
ITunesSearch/saga.jsincludes a delay that might be redundant given the component-level debouncing, potentially leading to a longer-than-intended wait time for API calls. (Severity: Medium) - Test Coverage for Debounced Actions: Tests for debounced actions in
ITunesSearch/tests/index.test.jsneed to use Jest's fake timers to accurately verify behavior. (Severity: Medium) - API Service Error Handling: The error handling in
services/itunesApi.jswithin theresolvemiddleware's catch block could be more robust when accessingerror.json. (Severity: Medium) - Incorrect API Service Test: A test in
services/tests/itunesApi.test.jsattempts to use a non-existentgetBaseURL()method on a wretch client instance. (Severity: Medium)
Merge Readiness
This pull request introduces a substantial new feature and a new theme, which is a great step forward. However, due to the identified high-severity issues in SongCard/index.js (event listener leak) and utils/apiUtils.js (API client generation logic), and several medium-severity issues related to testing and potential robustness, I recommend addressing these concerns before merging. The PR is marked as WIP, so these might already be on your radar. As a reviewer, I am not authorized to approve pull requests. Please ensure these changes are thoroughly tested and reviewed by other team members before merging.
| return () => { | ||
| if (audioRef.current) { | ||
| audioRef.current.pause(); | ||
| audioRef.current.removeEventListener('ended', () => setIsPlaying(false)); |
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The event listener for 'ended' added in handlePlayPause (line 42) uses an inline anonymous function () => setIsPlaying(false). The removeEventListener call here in the useEffect cleanup hook also uses a new anonymous function instance.
Because these are different function instances, removeEventListener will not be able to find and remove the listener that was originally added. This will lead to a memory leak, as listeners will accumulate every time handlePlayPause is called and a new audio element is potentially created (though current logic reuses it if audioRef.current exists).
Could you define the event handler function in a stable way (e.g., using useCallback or defining it outside handlePlayPause but within the component's scope if it depends on component state/props) and use that same reference for both addEventListener and removeEventListener?
// Define this handler in a stable way, e.g., using useCallback
// const handleAudioEnded = useCallback(() => setIsPlaying(false), []);
// audioRef.current.removeEventListener('ended', handleAudioEnded);
// For a direct fix here, assuming you'll refactor handlePlayPause too:
// This line needs to reference the *exact same function instance* as addEventListener
// A proper fix involves refactoring how the listener is defined and passed.
// Example (conceptual, full change involves handlePlayPause):
// const onAudioEnd = audioRef.current._onAudioEndHandler; // Assuming you store it
// if (onAudioEnd) audioRef.current.removeEventListener('ended', onAudioEnd);
audioRef.current.removeEventListener('ended', () => setIsPlaying(false)); // This line is problematic| const client = createApiClientWithTransForm(process.env.GITHUB_URL); | ||
| return Object.assign({}, apiClients, { [type]: client })[type]; |
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The refactoring of generateApiClient has a couple of implications:
- Caching/Singleton Behavior: The new implementation
const client = createApiClientWithTransForm(...); return Object.assign({}, apiClients, { [type]: client })[type];creates a new API client on every call togenerateApiClient. It also returns a client from a copy of theapiClientsobject, meaning the module-levelapiClientsis never updated. Consequently,getApiClient(which reads from the module-levelapiClients) will likely always returnnullor an outdated/initial client. This seems to break the previous caching behavior where a client, once generated for a type, would be reused. - Hardcoded URL:
process.env.GITHUB_URLis used as the base URL for all clients generated by this function, regardless of thetypeparameter. If this utility is intended for different API endpoints (e.g., GitHub, iTunes), the base URL should be configurable based on thetype.
Could you clarify the intended behavior here? If caching per type is desired, the module-level apiClients would need to be updated. If different base URLs are needed, createApiClientWithTransForm would need to receive the appropriate base URL based on type.
| export function* searchTracksSaga({ query }) { | ||
| try { | ||
| // Add a small delay to prevent too many API calls while typing | ||
| yield delay(300); |
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The ITunesSearch component (in index.js) already uses debounce with a 300ms delay for the dispatchSearchTracks action. This yield delay(300) in the saga introduces an additional 300ms delay.
This means the total delay from user input to the API call can be up to 600ms (component debounce + saga delay), which might feel a bit sluggish. Is this double delay intentional?
If the component-level debounce is the primary mechanism for preventing excessive API calls while typing, this saga-level delay might be redundant, especially since takeLatest is already being used to handle rapid dispatches.
| yield delay(300); | |
| // yield delay(300); // Consider removing if component already debounces |
| ); | ||
|
|
||
| const input = screen.getByPlaceholderText('Search for tracks...'); | ||
| fireEvent.change(input, { target: { value: 'test' } }); |
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This test, and the subsequent one for empty input, interacts with handleInputChange, which calls debouncedSearch. The actual dispatch(searchTracks('test')) happens inside the debounced function after a 300ms timeout.
Without using jest.useFakeTimers() and jest.advanceTimersByTime(), this assertion expect(store.dispatch).toHaveBeenCalledWith(searchTracks('test')) will likely check too early, before the debounced function has executed.
Could you update this test (and similar ones for debounced actions) to use Jest's fake timers to ensure the debounced logic is properly tested?
| fireEvent.change(input, { target: { value: 'test' } }); | |
| // Add jest.useFakeTimers() at the beginning of the test | |
| // and jest.advanceTimersByTime(300) before the assertion |
| return { | ||
| ok: false, | ||
| status: error.status, | ||
| data: error.json |
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In the catch block of the resolve middleware, data: error.json is used. If the error object doesn't have a .json property (e.g., it's a network error, or response.json() itself failed in the try block and resolver.res() threw a plain Error object), this line could either throw another error or assign undefined to data.
To make this more robust, perhaps consider checking if error.json exists or falling back to something like error.message or null for the data field in the error case? Wretch's error object often has error.json for parsed JSON error bodies and error.text for raw text. If it's a network error, error.message might be more appropriate.
| data: error.json | |
| data: typeof error.json === 'function' ? await error.json() : (error.json || error.message || null) |
|
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||
| describe('itunesApi', () => { | ||
| it('should be initialized with correct base URL', () => { | ||
| expect(itunesApi.getBaseURL()).toBe(ITUNES_BASE_URL); |
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The assertion expect(itunesApi.getBaseURL()).toBe(ITUNES_BASE_URL); will likely fail because wretch instances, like itunesApi, do not expose a getBaseURL() method by default.
The base URL is set during instantiation (wretch(ITUNES_BASE_URL)). Testing this directly might be tricky. You could infer it by checking the full URL constructed in a mock call if necessary, or simply trust that wretch handles the base URL correctly upon initialization.
Consider removing this specific assertion or finding an alternative way to verify the base URL if it's deemed critical for this test suite.
| const transformedBody = JSON.stringify(mapKeysDeep(parsedBody, (keys) => snakeCase(keys))); | ||
| return next(url, { ...opts, body: transformedBody }); |
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The change in transformRequestOptions to avoid mutating opts (i.e., return next(url, { ...opts, body: transformedBody });) is a great improvement for immutability! This is much cleaner.
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Actionable comments posted: 8
🧹 Nitpick comments (6)
app/services/itunesApi.js (1)
11-27: Consider simplifying the response resolver.The custom resolver adds complexity that may not be necessary. Consider using wretch's built-in error handling for cleaner code.
-const itunesApi = wretch(ITUNES_BASE_URL) - .resolve(async (resolver) => { - try { - const response = await resolver.res((data) => data); - const data = await response.json(); - return { - ok: response.ok, - status: response.status, - data - }; - } catch (error) { - return { - ok: false, - status: error.status || 500, - data: error.json || { message: 'An error occurred while searching tracks' } - }; - } - }); +const itunesApi = wretch(ITUNES_BASE_URL);Then handle the response in the searchTracks function:
export const searchTracks = async (query) => { // ... validation code ... try { const data = await itunesApi.get(`/search?${params.toString()}`).json(); return { ok: true, status: 200, data }; } catch (error) { return { ok: false, status: error.status || 500, data: { message: 'Failed to search tracks' } }; } };app/containers/ITunesSearch/tests/index.test.js (1)
67-83: Consider enhancing test coverage for better component validation.While the current tests cover core functionality well, consider adding tests for:
- Loading state display when
loading: true- Tracks rendering when tracks are present in state
- Debounced search behavior timing
Example additional test:
+ it('should show loading state', () => { + const state = { + itunesSearch: { + loading: true + } + }; + store = configureStore(state); + + render( + <Provider store={store}> + <ITunesSearch /> + </Provider> + ); + + expect(screen.getByText('Loading...')).toBeInTheDocument(); + });app/containers/ITunesSearch/saga.js (1)
21-21: Consider more robust error message handling.The fallback error message construction could be more robust. The optional chaining for
response.data?.messageis good, but consider handling cases wheretranslate()might fail.- throw new Error(response.data?.message || translate('search_tracks_error')); + const fallbackMessage = 'Failed to search tracks'; + const translatedMessage = translate('search_tracks_error') || fallbackMessage; + throw new Error(response.data?.message || translatedMessage);app/components/SongCard/index.js (3)
22-26: Use theme colors instead of hard-coded values.The hard-coded color values should use the theme's primary color to maintain consistency with the app's theme.
const PlayButton = styled(IconButton)` position: absolute; right: 8px; bottom: 8px; - background-color: rgba(147, 51, 234, 0.9); + background-color: ${({ theme }) => `${theme.palette.primary.main}e6`}; &:hover { - background-color: rgba(147, 51, 234, 1); + background-color: ${({ theme }) => theme.palette.primary.main}; } `;
34-89: Add JSDoc documentation.The component is missing JSDoc documentation as flagged by ESLint. Adding proper documentation will improve code maintainability.
+/** + * SongCard component for displaying track information with audio preview + * @param {Object} props - Component props + * @param {Object} props.track - Track object containing track details + * @param {string} props.track.trackName - Name of the track + * @param {string} props.track.artistName - Name of the artist + * @param {string} props.track.artworkUrl100 - URL for track artwork (100x100) + * @param {string} props.track.previewUrl - URL for audio preview + * @param {string} props.track.primaryGenreName - Primary genre of the track + * @returns {JSX.Element} Song card component + */ function SongCard({ track }) {🧰 Tools
🪛 ESLint
[error] 34-89: Missing JSDoc comment.
(require-jsdoc)
[error] 41-41: No object mutation allowed.
(immutable/no-mutation)
[error] 58-58: No object mutation allowed.
(immutable/no-mutation)
68-68: Make image URL transformation more robust.The current string replacement approach for scaling up the artwork could fail if the URL format changes. Consider a more robust approach.
- image={track.artworkUrl100.replace('100x100bb', '400x400bb')} + image={track.artworkUrl100.includes('100x100bb') + ? track.artworkUrl100.replace('100x100bb', '400x400bb') + : track.artworkUrl100}
📜 Review details
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Review profile: CHILL
Plan: Pro
⛔ Files ignored due to path filters (2)
package-lock.jsonis excluded by!**/package-lock.jsonyarn.lockis excluded by!**/yarn.lock,!**/*.lock
📒 Files selected for processing (20)
app/components/SongCard/index.js(1 hunks)app/containers/App/index.js(4 hunks)app/containers/ITunesSearch/actions.js(1 hunks)app/containers/ITunesSearch/constants.js(1 hunks)app/containers/ITunesSearch/index.js(1 hunks)app/containers/ITunesSearch/loadable.js(1 hunks)app/containers/ITunesSearch/reducer.js(1 hunks)app/containers/ITunesSearch/saga.js(1 hunks)app/containers/ITunesSearch/selectors.js(1 hunks)app/containers/ITunesSearch/tests/index.test.js(1 hunks)app/containers/ITunesSearch/tests/reducer.test.js(1 hunks)app/containers/ITunesSearch/tests/saga.test.js(1 hunks)app/containers/ITunesSearch/tests/selectors.test.js(1 hunks)app/routeConfig.js(1 hunks)app/services/itunesApi.js(1 hunks)app/services/tests/itunesApi.test.js(1 hunks)app/translations/en.json(1 hunks)app/utils/apiUtils.js(3 hunks)app/utils/routeConstants.js(1 hunks)package.json(1 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (11)
app/routeConfig.js (1)
app/containers/ITunesSearch/index.js (1)
ITunesSearch(111-197)
app/containers/ITunesSearch/loadable.js (1)
app/utils/loadable.js (1)
loadable(3-11)
app/components/SongCard/index.js (1)
app/containers/App/index.js (2)
theme(52-96)theme(52-96)
app/containers/ITunesSearch/tests/selectors.test.js (2)
app/containers/ITunesSearch/reducer.js (2)
initialState(4-9)initialState(4-9)app/containers/ITunesSearch/selectors.js (8)
selectTracks(12-12)selectTracks(12-12)selectLoading(17-17)selectLoading(17-17)selectError(22-22)selectError(22-22)selectQuery(27-27)selectQuery(27-27)
app/services/tests/itunesApi.test.js (2)
app/services/itunesApi.js (5)
itunesApi(9-27)ITUNES_BASE_URL(6-6)ITUNES_BASE_URL(6-6)searchTracks(34-34)searchTracks(34-34)app/containers/ITunesSearch/actions.js (2)
searchTracks(8-11)searchTracks(8-11)
app/containers/ITunesSearch/saga.js (3)
app/services/itunesApi.js (1)
response(13-13)app/containers/ITunesSearch/actions.js (4)
searchTracksSuccess(18-21)searchTracksSuccess(18-21)searchTracksError(28-31)searchTracksError(28-31)app/containers/ITunesSearch/constants.js (2)
SEARCH_TRACKS(1-1)SEARCH_TRACKS(1-1)
app/containers/ITunesSearch/reducer.js (1)
app/containers/ITunesSearch/constants.js (8)
SEARCH_TRACKS(1-1)SEARCH_TRACKS(1-1)SEARCH_TRACKS_SUCCESS(2-2)SEARCH_TRACKS_SUCCESS(2-2)SEARCH_TRACKS_ERROR(3-3)SEARCH_TRACKS_ERROR(3-3)CLEAR_TRACKS(4-4)CLEAR_TRACKS(4-4)
app/containers/ITunesSearch/actions.js (3)
app/services/itunesApi.js (2)
searchTracks(34-34)searchTracks(34-34)app/containers/ITunesSearch/tests/saga.test.js (1)
query(7-7)app/containers/ITunesSearch/constants.js (8)
SEARCH_TRACKS(1-1)SEARCH_TRACKS(1-1)SEARCH_TRACKS_SUCCESS(2-2)SEARCH_TRACKS_SUCCESS(2-2)SEARCH_TRACKS_ERROR(3-3)SEARCH_TRACKS_ERROR(3-3)CLEAR_TRACKS(4-4)CLEAR_TRACKS(4-4)
app/containers/ITunesSearch/selectors.js (1)
app/containers/ITunesSearch/reducer.js (2)
initialState(4-9)initialState(4-9)
app/utils/apiUtils.js (1)
app/utils/index.js (2)
mapKeysDeep(28-43)mapKeysDeep(28-43)
app/services/itunesApi.js (3)
app/containers/ITunesSearch/saga.js (1)
response(16-16)app/containers/ITunesSearch/actions.js (2)
searchTracks(8-11)searchTracks(8-11)app/containers/ITunesSearch/tests/saga.test.js (1)
query(7-7)
🪛 ESLint
app/components/SongCard/index.js
[error] 34-89: Missing JSDoc comment.
(require-jsdoc)
[error] 41-41: No object mutation allowed.
(immutable/no-mutation)
[error] 58-58: No object mutation allowed.
(immutable/no-mutation)
app/containers/ITunesSearch/index.js
[error] 5-5: 'Grid' is defined but never used.
(no-unused-vars)
[error] 15-15: 'SongCard' is defined but never used.
(no-unused-vars)
[error] 37-37: 'ResultsContainer' is assigned a value but never used.
(no-unused-vars)
🔇 Additional comments (28)
app/translations/en.json (1)
15-15: LGTM: Well-structured translation key.The new translation key follows the existing naming convention and provides clear error messaging for the iTunes search feature.
app/utils/routeConstants.js (1)
2-9: LGTM: Well-structured route configuration.The iTunes route configuration follows the existing pattern and uses appropriate dimensions for a track search interface. The larger maxwidth makes sense for displaying multiple search results.
app/routeConfig.js (2)
4-4: LGTM! Import follows the established pattern.The import statement correctly references the loadable component for the ITunesSearch feature, maintaining consistency with the existing codebase structure.
7-10: Route configuration looks good.The new iTunes route entry follows the same pattern as existing routes, properly spreading the route constants and assigning the component. This integrates the iTunes search feature seamlessly into the app's routing system.
app/containers/ITunesSearch/loadable.js (1)
1-7: Excellent implementation following established patterns.The loadable component correctly implements code splitting for the ITunesSearch feature. The JSDoc documentation is clear, and the implementation follows the same pattern used throughout the application for lazy-loaded components.
app/containers/ITunesSearch/constants.js (1)
1-4: Well-defined action constants following Redux best practices.The action type constants are properly namespaced and cover the complete async flow for the iTunes search feature. The naming convention is consistent with the rest of the application, and the set of actions (search, success, error, clear) is appropriate for this use case.
app/services/tests/itunesApi.test.js (1)
21-35: Test cases cover important scenarios well.The tests appropriately verify that the
searchTracksfunction constructs the correct URL with proper encoding for both normal and special character queries. The test cases demonstrate good coverage of edge cases like URL encoding for special characters.app/containers/ITunesSearch/tests/selectors.test.js (2)
1-56: Well-structured selector tests with comprehensive coverage.The test suite effectively covers all four selectors and includes both positive cases (with data) and edge cases (empty state). The test structure is clean and follows good practices.
48-54:✅ Verification successful
Verify that selectors handle missing state correctly.
The test assumes selectors return
initialStatevalues when theitunesSearchslice is missing from the state. This depends on the selector implementation providing proper default values.
🏁 Script executed:
#!/bin/bash # Verify selector implementations handle missing state correctly ast-grep --pattern 'export const select$_ = createSelector($_,$_)'Length of output: 68
Let’s inspect the actual selector implementations to confirm whether they default to
initialStatewhenitunesSearchis missing:
🏁 Script executed:
#!/bin/bash # Locate the selectors.js file SELECTORS_FILE=$(fd --type f 'selectors.js' | head -n1) echo "Selectors file: $SELECTORS_FILE" # Show all exported selector definitions echo "---- Selector exports ----" rg '^export const select' -n "$SELECTORS_FILE" # Show any createSelector usage echo "---- createSelector usage ----" rg 'createSelector' -n "$SELECTORS_FILE" # Show references to initialState echo "---- initialState references ----" rg 'initialState' -n "$SELECTORS_FILE"Length of output: 1656
Let’s inspect the ITunesSearch selectors, not HomeContainer’s:
This will confirm whether each selector defaults to
initialStatewhen the ITunesSearch slice is missing.
🏁 Script executed:
#!/bin/bash # Find the selectors file under ITunesSearch SELECTORS_FILE=$(fd --type f 'selectors.js' | grep 'ITunesSearch/selectors.js' | head -n1) echo "Selectors file: $SELECTORS_FILE" # List exported selectors rg '^export const select' -n "$SELECTORS_FILE" # See how createSelector is used rg 'createSelector' -n "$SELECTORS_FILE" # Check for initialState fallbacks rg 'initialState' -n "$SELECTORS_FILE"Length of output: 1451
Selectors correctly default to initialState when the slice is missing
All four selectors use
selectITunesSearchDomain, which returnsstate.itunesSearch || initialState, so they’ll fall back toinitialStateproperties whenitunesSearchis undefined. Tests for an empty state are valid.app/containers/ITunesSearch/tests/index.test.js (2)
8-10: Good mocking strategy for dependency injection.Properly mocks the utility modules that handle reducer and saga injection, which prevents side effects during testing.
14-17: Effective Redux store mocking setup.The beforeEach setup correctly configures a fresh store and mocks the dispatch function for each test, ensuring test isolation.
app/containers/ITunesSearch/saga.js (3)
11-26: Well-implemented saga with proper debouncing and error handling.The saga correctly implements:
- 300ms debounce delay to prevent excessive API calls
- Proper try-catch error handling
- Success/error action dispatching
31-35: Excellent use of takeLatest for search scenarios.Using
takeLatestensures only the most recent search request is processed, preventing race conditions and outdated results from appearing. This is the correct pattern for search functionality.
18-22:✅ Verification successful
Verify API response structure assumptions.
The code assumes the API response has an
okboolean property and adataobject withresultsand optionalmessageproperties. Ensure this matches the actual iTunes API service implementation.
🏁 Script executed:
#!/bin/bash # Check the iTunes API service implementation to verify response structure cat app/services/itunesApi.jsLength of output: 921
API response shape confirmed
TheitunesApiclient wrapper inapp/services/itunesApi.jsreturns an object{ ok, status, data }, wheredatais the parsed JSON from the iTunes Search API and includes aresultsarray. There is nomessagefield in the iTunes response, so the optionalresponse.data?.messagewill beundefined, and your fallbacktranslate('search_tracks_error')covers error cases gracefully. No changes required.• app/services/itunesApi.js – defines the response as
{ ok, status, data }
• app/containers/ITunesSearch/saga.js (lines 18–22) – correctly usesresponse.okandresponse.data.resultsapp/containers/ITunesSearch/tests/reducer.test.js (2)
1-58: Comprehensive reducer test coverage with correct state transitions.The test suite excellently covers:
- Initial state handling
- All four action types with proper state transitions
- Loading state management
- Error handling
- State reset functionality
The test structure is clean and assertions verify the correct reducer behavior.
48-57: Good test for state reset functionality.The test properly verifies that
CLEAR_TRACKSresets all state back toinitialState, which is important for cleanup when users clear the search or navigate away.app/containers/ITunesSearch/selectors.js (1)
1-28: LGTM! Well-implemented Redux selectors.The selectors follow Redux best practices with proper memoization using
reselect, clean fallback handling toinitialState, and a well-structured approach. The implementation is efficient and maintainable.app/containers/ITunesSearch/reducer.js (1)
1-45: Excellent reducer implementation!The reducer follows Redux best practices with proper use of
immerfor immutable updates, comprehensive action handling, and clean state management. The implementation correctly manages loading states, error handling, and data updates.app/containers/ITunesSearch/actions.js (1)
1-40: LGTM! Well-structured Redux action creators.The action creators follow Redux best practices with:
- Clear JSDoc documentation with proper parameter types
- Consistent naming conventions aligned with constants
- Standard action object structure (type + payload)
- Complete CRUD operations including error handling
app/containers/ITunesSearch/index.js (4)
1-16: Expected unused imports for WIP feature.The ESLint warnings about unused imports (
Grid,SongCard,ResultsContainer) are expected since the results rendering section is commented out (lines 184-194). These imports will be utilized when the feature is completed.🧰 Tools
🪛 ESLint
[error] 5-5: 'Grid' is defined but never used.
(no-unused-vars)
[error] 15-15: 'SongCard' is defined but never used.
(no-unused-vars)
111-152: Excellent implementation of debounced search with proper cleanup.The component demonstrates best practices:
- Proper debouncing with 300ms delay to optimize API calls
- Cleanup on unmount to prevent memory leaks
- Immediate UI updates with debounced backend calls
- Manual search trigger for user control
199-221: Comprehensive PropTypes validation.Well-defined PropTypes with proper shape validation for complex objects like tracks and error, including sensible default props.
241-246: Proper Redux integration with HOC composition.Excellent use of Redux injectors for dynamic reducer/saga loading and proper component memoization for performance optimization.
app/utils/apiUtils.js (2)
36-39: Good immutability improvement in client generation.The refactoring properly avoids mutating the shared
apiClientsobject by creating a new object withObject.assignand returning only the requested client type.
52-64: Excellent refactoring for immutability in request transformation.The middleware now properly avoids mutating the original
optsobject by:
- Using spread operator to create new options object
- Early return for falsy body values
- Maintaining robust error handling for invalid JSON
app/containers/App/index.js (3)
33-50: Modern theme implementation with proper layering.Excellent implementation of the blurred background effect:
- Fixed positioning covers entire viewport
- Gradient background with backdrop blur for modern aesthetic
- Proper z-index layering (-1 for background, 1 for content)
- Styled container maintains full viewport height
52-96: Well-structured dark theme with consistent Material-UI integration.The theme implementation demonstrates best practices:
- Comprehensive dark mode palette with custom violet colors
- Component-level overrides for Paper and Card components
- Consistent semi-transparent violet background with blur effects
- Proper backdrop filter support for modern browsers
133-158: Clean layout restructuring with maintained functionality.The layout changes preserve all existing routing and functionality while adding the new visual design. The fragment wrapper properly contains both the background and content layers.
| @@ -108,6 +108,7 @@ | |||
| "dotenv": "10.0.0", | |||
| "express": "4.16.4", | |||
| "history": "4.9.x", | |||
| "husky": "^9.1.7", | |||
There was a problem hiding this comment.
🛠️ Refactor suggestion
Move husky to devDependencies.
Husky is a development tool for Git hooks and should be placed in devDependencies rather than dependencies to avoid including it in production builds.
- "husky": "^9.1.7",And add it to devDependencies:
+ "husky": "^9.1.7",Committable suggestion skipped: line range outside the PR's diff.
🤖 Prompt for AI Agents
In package.json at line 111, move the "husky" entry from "dependencies" to
"devDependencies" to ensure it is only included in development environments and
not in production builds. Remove the "husky" line from dependencies and add the
same line under the devDependencies section.
| } catch (error) { | ||
| return { | ||
| ok: false, | ||
| status: error.status, | ||
| data: error.json | ||
| }; | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Improve error handling robustness.
The error object may not always have status and json properties, which could cause undefined values in the response.
} catch (error) {
return {
ok: false,
- status: error.status,
- data: error.json
+ status: error.status || 500,
+ data: error.json || { message: 'An error occurred while searching tracks' }
};
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| } catch (error) { | |
| return { | |
| ok: false, | |
| status: error.status, | |
| data: error.json | |
| }; | |
| } | |
| } catch (error) { | |
| return { | |
| ok: false, | |
| status: error.status || 500, | |
| data: error.json || { message: 'An error occurred while searching tracks' } | |
| }; | |
| } |
🤖 Prompt for AI Agents
In app/services/itunesApi.js around lines 20 to 26, the catch block assumes the
error object always has status and json properties, which may be undefined.
Update the error handling to safely access these properties by providing default
values or checking their existence before returning them, ensuring the response
object never contains undefined values.
| * @param {string} query - The search term | ||
| * @returns {Promise} API response with track results | ||
| */ | ||
| export const searchTracks = (query) => itunesApi.get(`/search?term=${encodeURIComponent(query)}&entity=song&limit=20`); |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Add input validation and improve URL construction.
The function should validate the query parameter and use URLSearchParams for safer URL construction.
-export const searchTracks = (query) => itunesApi.get(`/search?term=${encodeURIComponent(query)}&entity=song&limit=20`);
+export const searchTracks = (query) => {
+ if (!query || typeof query !== 'string' || query.trim().length === 0) {
+ return Promise.reject(new Error('Query parameter is required and must be a non-empty string'));
+ }
+
+ const params = new URLSearchParams({
+ term: query.trim(),
+ entity: 'song',
+ limit: '20'
+ });
+
+ return itunesApi.get(`/search?${params.toString()}`);
+};📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| export const searchTracks = (query) => itunesApi.get(`/search?term=${encodeURIComponent(query)}&entity=song&limit=20`); | |
| export const searchTracks = (query) => { | |
| if (!query || typeof query !== 'string' || query.trim().length === 0) { | |
| return Promise.reject(new Error('Query parameter is required and must be a non-empty string')); | |
| } | |
| const params = new URLSearchParams({ | |
| term: query.trim(), | |
| entity: 'song', | |
| limit: '20' | |
| }); | |
| return itunesApi.get(`/search?${params.toString()}`); | |
| }; |
🤖 Prompt for AI Agents
In app/services/itunesApi.js at line 34, the searchTracks function lacks input
validation and constructs the URL using string interpolation, which can be
unsafe. Add validation to check if the query parameter is a non-empty string
before proceeding. Replace the manual URL string construction with
URLSearchParams to build the query string safely and correctly encode
parameters.
|
|
||
| // Create iTunes API client | ||
| const itunesApi = wretch(ITUNES_BASE_URL) | ||
| .headers({ 'Content-Type': 'application/json' }) |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Remove unnecessary Content-Type header.
The iTunes API expects URL-encoded GET requests, not JSON. This Content-Type header is unnecessary and potentially misleading.
- .headers({ 'Content-Type': 'application/json' })📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| .headers({ 'Content-Type': 'application/json' }) |
🤖 Prompt for AI Agents
In app/services/itunesApi.js at line 10, remove the 'Content-Type':
'application/json' header from the request configuration because the iTunes API
expects URL-encoded GET requests and does not require or use a JSON content type
header. This will prevent sending misleading headers and ensure proper request
formatting.
| const mockGet = jest.fn(); | ||
| const originalGet = itunesApi.get; | ||
|
|
||
| beforeEach(() => { | ||
| itunesApi.get = mockGet; | ||
| }); | ||
|
|
||
| afterEach(() => { | ||
| itunesApi.get = originalGet; | ||
| jest.clearAllMocks(); | ||
| }); |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Improve the mocking strategy for better test isolation.
The current approach of directly replacing methods on the API client instance could lead to issues with test isolation and proper cleanup. Consider using Jest's module mocking instead.
Apply this diff to use a more robust mocking approach:
+jest.mock('../itunesApi', () => ({
+ ...jest.requireActual('../itunesApi'),
+ itunesApi: {
+ get: jest.fn(),
+ getBaseURL: jest.fn(() => 'https://itunes.apple.com')
+ }
+}));
+
describe('itunesApi', () => {
- it('should be initialized with correct base URL', () => {
- expect(itunesApi.getBaseURL()).toBe(ITUNES_BASE_URL);
- });
-
describe('searchTracks', () => {
- const mockGet = jest.fn();
- const originalGet = itunesApi.get;
-
beforeEach(() => {
- itunesApi.get = mockGet;
+ jest.clearAllMocks();
});
- afterEach(() => {
- itunesApi.get = originalGet;
- jest.clearAllMocks();
- });This approach provides better test isolation and doesn't mutate the original API client.
📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| const mockGet = jest.fn(); | |
| const originalGet = itunesApi.get; | |
| beforeEach(() => { | |
| itunesApi.get = mockGet; | |
| }); | |
| afterEach(() => { | |
| itunesApi.get = originalGet; | |
| jest.clearAllMocks(); | |
| }); | |
| // at the very top of your test file | |
| jest.mock('../itunesApi', () => ({ | |
| ...jest.requireActual('../itunesApi'), | |
| itunesApi: { | |
| get: jest.fn(), | |
| getBaseURL: jest.fn(() => 'https://itunes.apple.com') | |
| } | |
| })); | |
| describe('itunesApi', () => { | |
| // you can remove or comment out the old base-URL test if you still need it, | |
| // but it’s no longer exercising real code here: | |
| // | |
| // it('should be initialized with correct base URL', () => { | |
| // expect(itunesApi.getBaseURL()).toBe(ITUNES_BASE_URL); | |
| // }); | |
| describe('searchTracks', () => { | |
| beforeEach(() => { | |
| jest.clearAllMocks(); | |
| }); | |
| // …keep your existing tests for searchTracks here… | |
| }); | |
| }); |
🤖 Prompt for AI Agents
In app/services/tests/itunesApi.test.js around lines 9 to 19, the current test
setup directly replaces the itunesApi.get method, which risks test pollution and
improper cleanup. Refactor the tests to use Jest's module mocking capabilities
by mocking the entire itunesApi module or its get method using jest.mock at the
top of the test file. This avoids mutating the original API client and ensures
each test runs with a clean, isolated mock, improving test reliability and
maintainability.
| describe('searchTracksSaga', () => { | ||
| const query = 'test'; | ||
| const generator = searchTracksSaga({ query }); | ||
|
|
||
| it('should delay to debounce user input', () => { | ||
| expect(generator.next().value).toEqual(delay(300)); | ||
| }); | ||
|
|
||
| it('should call the API', () => { | ||
| expect(generator.next().value).toEqual( | ||
| call(searchTracks, query) | ||
| ); | ||
| }); | ||
|
|
||
| it('should put success action for successful API call', () => { | ||
| const response = { | ||
| ok: true, | ||
| data: { | ||
| results: ['track1', 'track2'] | ||
| } | ||
| }; | ||
| expect(generator.next(response).value).toEqual( | ||
| put(searchTracksSuccess(response.data.results)) | ||
| ); | ||
| }); | ||
|
|
There was a problem hiding this comment.
🛠️ Refactor suggestion
Improve test reliability by using fresh generators.
The current approach reuses the same generator instance across multiple tests, which can lead to unreliable tests due to shared state. Each test should use a fresh generator instance.
-describe('searchTracksSaga', () => {
- const query = 'test';
- const generator = searchTracksSaga({ query });
-
- it('should delay to debounce user input', () => {
- expect(generator.next().value).toEqual(delay(300));
- });
-
- it('should call the API', () => {
- expect(generator.next().value).toEqual(
- call(searchTracks, query)
- );
- });
-
- it('should put success action for successful API call', () => {
- const response = {
- ok: true,
- data: {
- results: ['track1', 'track2']
- }
- };
- expect(generator.next(response).value).toEqual(
- put(searchTracksSuccess(response.data.results))
- );
- });
+describe('searchTracksSaga', () => {
+ const query = 'test';
+
+ it('should delay to debounce user input', () => {
+ const generator = searchTracksSaga({ query });
+ expect(generator.next().value).toEqual(delay(300));
+ });
+
+ it('should call the API', () => {
+ const generator = searchTracksSaga({ query });
+ generator.next(); // delay
+ expect(generator.next().value).toEqual(
+ call(searchTracks, query)
+ );
+ });
+
+ it('should put success action for successful API call', () => {
+ const generator = searchTracksSaga({ query });
+ generator.next(); // delay
+ generator.next(); // api call
+
+ const response = {
+ ok: true,
+ data: {
+ results: ['track1', 'track2']
+ }
+ };
+ expect(generator.next(response).value).toEqual(
+ put(searchTracksSuccess(response.data.results))
+ );
+ });📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| describe('searchTracksSaga', () => { | |
| const query = 'test'; | |
| const generator = searchTracksSaga({ query }); | |
| it('should delay to debounce user input', () => { | |
| expect(generator.next().value).toEqual(delay(300)); | |
| }); | |
| it('should call the API', () => { | |
| expect(generator.next().value).toEqual( | |
| call(searchTracks, query) | |
| ); | |
| }); | |
| it('should put success action for successful API call', () => { | |
| const response = { | |
| ok: true, | |
| data: { | |
| results: ['track1', 'track2'] | |
| } | |
| }; | |
| expect(generator.next(response).value).toEqual( | |
| put(searchTracksSuccess(response.data.results)) | |
| ); | |
| }); | |
| describe('searchTracksSaga', () => { | |
| const query = 'test'; | |
| it('should delay to debounce user input', () => { | |
| const generator = searchTracksSaga({ query }); | |
| expect(generator.next().value).toEqual(delay(300)); | |
| }); | |
| it('should call the API', () => { | |
| const generator = searchTracksSaga({ query }); | |
| generator.next(); // delay | |
| expect(generator.next().value).toEqual( | |
| call(searchTracks, query) | |
| ); | |
| }); | |
| it('should put success action for successful API call', () => { | |
| const generator = searchTracksSaga({ query }); | |
| generator.next(); // delay | |
| generator.next(); // api call | |
| const response = { | |
| ok: true, | |
| data: { | |
| results: ['track1', 'track2'] | |
| } | |
| }; | |
| expect(generator.next(response).value).toEqual( | |
| put(searchTracksSuccess(response.data.results)) | |
| ); | |
| }); | |
| }); |
🤖 Prompt for AI Agents
In app/containers/ITunesSearch/tests/saga.test.js between lines 6 and 31, the
tests reuse the same generator instance across multiple it blocks, causing
shared state and unreliable tests. To fix this, instantiate a new generator
inside each it block instead of using a shared one declared outside. This
ensures each test runs with a fresh generator and independent state.
| if (isPlaying) { | ||
| audioRef.current.pause(); | ||
| } else { | ||
| audioRef.current.play(); | ||
| } | ||
| setIsPlaying(!isPlaying); |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Add error handling for audio playback.
The audio.play() method returns a Promise that can be rejected if playback fails. This should be handled to prevent unhandled promise rejections.
if (isPlaying) {
audioRef.current.pause();
} else {
- audioRef.current.play();
+ audioRef.current.play().catch((error) => {
+ console.error('Audio playback failed:', error);
+ setIsPlaying(false);
+ });
}
setIsPlaying(!isPlaying);📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| if (isPlaying) { | |
| audioRef.current.pause(); | |
| } else { | |
| audioRef.current.play(); | |
| } | |
| setIsPlaying(!isPlaying); | |
| if (isPlaying) { | |
| audioRef.current.pause(); | |
| } else { | |
| audioRef.current.play().catch((error) => { | |
| console.error('Audio playback failed:', error); | |
| setIsPlaying(false); | |
| }); | |
| } | |
| setIsPlaying(!isPlaying); |
🤖 Prompt for AI Agents
In app/components/SongCard/index.js around lines 45 to 50, the audio.play() call
returns a Promise that may reject if playback fails, but currently there is no
error handling. Modify the code to handle the Promise returned by
audioRef.current.play() by adding a .catch() block to catch and handle any
playback errors, preventing unhandled promise rejections.
| React.useEffect(() => { | ||
| return () => { | ||
| if (audioRef.current) { | ||
| audioRef.current.pause(); | ||
| audioRef.current.removeEventListener('ended', () => setIsPlaying(false)); | ||
| audioRef.current = null; | ||
| } | ||
| }; | ||
| }, []); |
There was a problem hiding this comment.
Fix audio cleanup in useEffect.
The current cleanup function has a bug - the event listener removal won't work because it creates a new function reference instead of removing the original listener.
function SongCard({ track }) {
const [isPlaying, setIsPlaying] = useState(false);
const audioRef = useRef(null);
+ const endedListenerRef = useRef(null);
const handlePlayPause = (e) => {
e.stopPropagation();
if (!audioRef.current) {
audioRef.current = new Audio(track.previewUrl);
- audioRef.current.addEventListener('ended', () => setIsPlaying(false));
+ endedListenerRef.current = () => setIsPlaying(false);
+ audioRef.current.addEventListener('ended', endedListenerRef.current);
}
// ... rest of function
};
React.useEffect(() => {
return () => {
if (audioRef.current) {
audioRef.current.pause();
- audioRef.current.removeEventListener('ended', () => setIsPlaying(false));
+ if (endedListenerRef.current) {
+ audioRef.current.removeEventListener('ended', endedListenerRef.current);
+ }
audioRef.current = null;
}
};
}, []);📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| React.useEffect(() => { | |
| return () => { | |
| if (audioRef.current) { | |
| audioRef.current.pause(); | |
| audioRef.current.removeEventListener('ended', () => setIsPlaying(false)); | |
| audioRef.current = null; | |
| } | |
| }; | |
| }, []); | |
| function SongCard({ track }) { | |
| const [isPlaying, setIsPlaying] = useState(false); | |
| const audioRef = useRef(null); | |
| const endedListenerRef = useRef(null); | |
| const handlePlayPause = (e) => { | |
| e.stopPropagation(); | |
| if (!audioRef.current) { | |
| audioRef.current = new Audio(track.previewUrl); | |
| endedListenerRef.current = () => setIsPlaying(false); | |
| audioRef.current.addEventListener('ended', endedListenerRef.current); | |
| } | |
| // ... rest of function | |
| }; | |
| React.useEffect(() => { | |
| return () => { | |
| if (audioRef.current) { | |
| audioRef.current.pause(); | |
| if (endedListenerRef.current) { | |
| audioRef.current.removeEventListener('ended', endedListenerRef.current); | |
| } | |
| audioRef.current = null; | |
| } | |
| }; | |
| }, []); | |
| // ... rest of component | |
| } |
🧰 Tools
🪛 ESLint
[error] 58-58: No object mutation allowed.
(immutable/no-mutation)
🤖 Prompt for AI Agents
In app/components/SongCard/index.js around lines 53 to 61, the cleanup function
in useEffect incorrectly removes the 'ended' event listener by passing a new
anonymous function, which does not match the original listener reference. To fix
this, store the event handler function in a variable when adding the listener,
then use the same variable to remove the listener in the cleanup function,
ensuring proper removal of the event listener.
itunes api init! WIP, Due 3 days. visit route /itunes
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