fix(core): mock async externals in commonjs output

[9aoy]

Summary

Fixes { mock: true } for CommonJS output when an external ESM module is represented as a promise-returning webpack module. The runtime now waits for async externals to resolve before applying mockObject, so dynamic imports like await import('@rsbuild/core') receive the mocked module namespace instead of a mocked Promise wrapper.

Related Links

#1415

Checklist

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

[github-actions]

Rsdoctor Bundle Diff Analysis

Found 13 projects in monorepo, 1 project with changes.

📊 Quick Summary

Project	Total Size	Change
adapter-rsbuild	5.4 KB	0
adapter-rslib	25.6 KB	0
adapter-rspack	9.3 KB	0
browser	2.0 MB	0
browser-react	6.4 KB	0
browser-ui	809.5 KB	0
coverage-istanbul	18.8 KB	0
coverage-v8	19.4 KB	0
core/browser	1.1 MB	0
core/loaders	869.0 B	0
core/main	1.9 MB	+324.0 B (0.0%)
vscode/extension	27.0 MB	0
vscode/worker	14.5 KB	0

📋 Detailed Reports (Click to expand)

📁 core/main

Path: packages/core/.rsdoctor/main/rsdoctor-data.json

📌 Baseline Commit: e67492d747 | PR: #1345

Metric	Current	Baseline	Change
📊 Total Size	1.9 MB	1.9 MB	+324.0 B (0.0%)
📄 JavaScript	1.6 MB	1.6 MB	+324.0 B (0.0%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	293.7 KB	293.7 KB	0

📦 Download Diff Report: core/main Bundle Diff

Generated by Rsdoctor GitHub Action

[9aoy]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Chef's kiss.

Reviewed commit: 061143d537

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