feat(core): support source.transformImport

[9aoy]

Summary

Background

Rsbuild and Rslib expose source.transformImport, but Rstest did not accept or inherit that option yet. This made on-demand import transforms inconsistent between build configs and test runs.

Implementation

• Added source.transformImport to the Rstest config type and forwarded it through the Rsbuild and Rslib adapters.
• Added adapter unit tests plus a bare rstest.config e2e case to verify the option is applied in tests.
• Documented the new config entry and the current caveat that transformed requests can affect rs.mock() and related actual-import APIs.

User Impact

Users can now configure source.transformImport directly in Rstest or inherit it from Rsbuild and Rslib configs, with the current mocking limitation documented.

Checklist

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

Validation

• pnpm format
• pnpm run lint
• pnpm run typecheck
• pnpm run build
• pnpm run test
• cd e2e && pnpm test

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Rsdoctor Bundle Diff Analysis

Found 12 projects in monorepo, 2 projects with changes.

📊 Quick Summary

Project	Total Size	Change
adapter-rsbuild	2.2 KB	📈 +46.0 B (+2.1%)
adapter-rslib	23.2 KB	+50.0 B (0.2%)
adapter-rspack	5.9 KB	0
browser	2.0 MB	0
browser-react	3.7 KB	0
browser-ui	804.4 KB	0
coverage-istanbul	8.9 KB	0
core/browser	970.4 KB	0
core/loaders	869.0 B	0
core/main	1.5 MB	0
vscode/extension	60.2 MB	0
vscode/worker	14.4 KB	0

📋 Detailed Reports (Click to expand)

📁 adapter-rsbuild

Path: packages/adapter-rsbuild/.rsdoctor/rsdoctor-data.json

📌 Baseline Commit: a3591b23fe | PR: #1130

Metric	Current	Baseline	Change
📊 Total Size	2.2 KB	2.1 KB	+46.0 B (+2.1%)
📄 JavaScript	2.2 KB	2.1 KB	+46.0 B (+2.1%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	0 B	0 B	0

📦 Download Diff Report: adapter-rsbuild Bundle Diff

📁 adapter-rslib

Path: packages/adapter-rslib/.rsdoctor/rsdoctor-data.json

📌 Baseline Commit: a3591b23fe | PR: #1130

Metric	Current	Baseline	Change
📊 Total Size	23.2 KB	23.2 KB	+50.0 B (0.2%)
📄 JavaScript	23.2 KB	23.2 KB	+50.0 B (0.2%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	0 B	0 B	0

📦 Download Diff Report: adapter-rslib Bundle Diff

Generated by Rsdoctor GitHub Action