perf(hmr): reduce stats.toJson() calls

[chenjiahan]

Summary

• Store the latest build stats on the shared build state and reset them on invalidation so it can be reused.
• Centralize stats option merging in getStatsOptions, adding minimal default options to keep the JSON output consistent.
• Refactor the dev socket server to consume the cached stats
• TODO: Fix the "display type errors on overlay" test case, related: https://github.com/rspack-contrib/ts-checker-rspack-plugin/blob/1f6ccaf1b5fdeb84d5a5c9f781661b760fc4a6e5/src/hooks/intercept-done-to-get-dev-server-tap.ts#L15-L23

Before

After

Checklist

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

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[Copilot]

Pull Request Overview

This PR optimizes build statistics performance by caching stats on the shared build state and centralizing stats option handling. The key performance improvement is storing the latest build stats on the build state to reuse them instead of repeatedly calling toJson() on raw stats objects.

Key changes:

• Added cached stats storage to the build state and reset them on invalidation
• Centralized stats option merging in getStatsOptions with minimal defaults for consistent JSON output
• Refactored the dev socket server to consume cached stats instead of storing raw stats objects

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/core/src/types/rsbuild.ts	Extended RsbuildStatsItem to include entrypoints and hash fields
packages/core/src/types/context.ts	Added ActionType and stats field to BuildState
packages/core/src/server/socketServer.ts	Major refactor to use cached stats and simplified stats handling
packages/core/src/server/assets-middleware/index.ts	Removed stats parameter from onBuildDone callback
packages/core/src/provider/createCompiler.ts	Added stats caching and uses centralized getStatsOptions
packages/core/src/helpers/stats.ts	Enhanced getStatsOptions with action-specific defaults
packages/core/src/createContext.ts	Initialize stats field in buildState
packages/compat/webpack/src/createCompiler.ts	Updated to use cached stats approach
e2e/cases/server/overlay-type-errors/index.test.ts	Temporarily disabled failing test

Comments suppressed due to low confidence (1)

packages/core/src/helpers/stats.ts:1

• The getStatsOptions function is called without the action parameter in the webpack compatibility layer, missing the performance optimization for dev mode where hash and entrypoints are conditionally included.

import color from '../../compiled/picocolors/index.js';

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