chore: update file size snapshot path

[chenjiahan]

Summary

• Update the cache file path to be under rsbuild directory
• Improve cache handling by returning null when cache is invalid

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[chatgpt-codex-connector]

💡 Codex Review

rsbuild/packages/core/src/plugins/fileSize.ts

Lines 203 to 204 in 91bf5f3

	if (showDiff) {
	const sizeData = previousSizes[environmentName]?.[normalizedName];

Guard previousSizes before indexing in diff block

After loadPreviousSizes was changed to return FileSizeCache | null, the diff branch still accesses previousSizes[environmentName] without a null guard. With strict null checks enabled ("strict": true in node_modules/@rsbuild/config/tsconfig.json), TypeScript reports “Object is possibly 'null'” here and compilation fails for this plugin. Add a null check or assert non-null before indexing so the build can typecheck.

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[Copilot]

Pull request overview

This PR reorganizes the file size cache location and improves cache handling semantics. The cache file is moved from the root of .cache/ into a dedicated rsbuild/ subdirectory, and the cache loading function now returns null instead of an empty object when no cache exists.

• Cache file path updated from node_modules/.cache/file-sizes-cache.json to node_modules/.cache/rsbuild/file-sizes.json
• loadPreviousSizes return type changed from {} to null when cache is unavailable

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
website/docs/en/config/performance/print-file-size.mdx	Documentation updated to reflect new cache file path
packages/core/src/plugins/fileSize.ts	Cache path updated in getCacheFilePath and return type improved in loadPreviousSizes

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