⚡ Bolt: [performance improvement]#424
Conversation
Replaces a sequential `for...of` await loop with an array of Promises mapping to concurrent I/O operations resolved by `Promise.all()`. This dramatically speeds up export tasks involving large icon libraries. Co-authored-by: aafre <8656674+aafre@users.noreply.github.com>
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Code Review
This pull request optimizes the icon export process in useIconRegistry.ts by refactoring a sequential for...of loop into a concurrent implementation using Promise.all(). This change significantly reduces export time for resumes with multiple icons. Additionally, a new learning entry was added to .jules/bolt.md documenting this optimization. The review feedback suggests further improving the code by filtering valid filenames before mapping, which would simplify the logic and enhance type safety.
| const exportPromises = targetFilenames.map(async (filename) => { | ||
| const entry = registry[filename]; | ||
| if (entry) { | ||
| try { | ||
| const base64Data = await fileToBase64(entry.file); | ||
| exportData[filename] = { | ||
| data: base64Data, | ||
| type: entry.file.type, | ||
| size: entry.file.size, | ||
| uploadedAt: entry.uploadedAt.toISOString(), | ||
| return { | ||
| filename, | ||
| data: { | ||
| data: base64Data, | ||
| type: entry.file.type, | ||
| size: entry.file.size, | ||
| uploadedAt: entry.uploadedAt.toISOString(), | ||
| } | ||
| }; | ||
| } catch (error) { | ||
| console.warn(`Failed to export icon ${filename}:`, error); | ||
| return null; | ||
| } | ||
| } | ||
| } | ||
| return null; | ||
| }); |
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For improved readability and separation of concerns, you can first filter the targetFilenames to get only the ones present in the registry, and then map over the valid filenames. This removes the need for the if (entry) check inside the map callback, simplifying its logic. Additionally, using a type guard in the filter improves type safety by ensuring the filename is a valid key, aligning with repository rules regarding specific union types.
const exportPromises = targetFilenames
.filter((filename): filename is keyof typeof registry => !!registry[filename])
.map(async (filename) => {
const entry = registry[filename];
try {
const base64Data = await fileToBase64(entry.file);
return {
filename,
data: {
data: base64Data,
type: entry.file.type,
size: entry.file.size,
uploadedAt: entry.uploadedAt.toISOString(),
},
};
} catch (error) {
console.warn("Failed to export icon " + filename + ":", error);
return null;
}
});References
- To improve type safety and eliminate the need for type assertions, use a specific union type for function parameters that determine the return type, rather than a generic string.
1 participant
💡 What: Changed the sequential await loop in
exportIconsForYAMLto usePromise.allacross concurrently mapped functions.🎯 Why: I/O bound tasks like FileReader conversions block synchronously when awaited inside iterative loops. Refactoring to parallel map+Promise.all allows the browser to process file conversions concurrently.
📊 Impact: Significantly speeds up resume generation/export for users with dense icon usage. Reduces cumulative task processing delay.
🔬 Measurement: Verify export functionality via
pnpm testand code review. TimeexportIconsForYAMLoperations with 10+ icon assets to observe relative duration drops.PR created automatically by Jules for task 15059762609156276201 started by @aafre