feat!: remove experiments.topLevelAwait

[LingyuCoder]

Summary

The Rspack experiments.topLevelAwait option was used to control support for top-level await, and it has always been enabled by default.
After careful observation, we found no real-world scenarios where disabling top-level await was necessary.

As a result, this option has been deprecated and is planned for removal in Rspack 2.0, at that point top-level await support can no longer be disabled.

Related links

Checklist

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

[netlify]

✅ Deploy Preview for rspack-v2 canceled.

Name	Link
🔨 Latest commit	24f8515
🔍 Latest deploy log	https://app.netlify.com/projects/rspack-v2/deploys/69671b65d0f34300085a6c2b

[github-actions]

📦 Binary Size-limit

Comparing 24f8515 to chore(deps): update patch crates (#12716) by renovate[bot]

🎉 Size decreased by 386.63KB from 47.90MB to 47.53MB (⬇️0.79%)

[github-actions]

Rsdoctor Bundle Diff Analysis

Found 5 projects in monorepo, 3 projects with changes.

📊 Quick Summary

Project	Total Size	Change
react-10k	5.7 MB	-8.0 B (-0.0%)
react-5k	2.7 MB	+1.0 B (0.0%)
react-1k	825.4 KB	0
rome	986.0 KB	+1.7 KB (0.2%)
ui-components	2.1 MB	0

📋 Detailed Reports (Click to expand)

📁 react-10k

Path: ../build-tools-performance/cases/react-10k/dist/rsdoctor-data.json

📌 Baseline Commit: 0ddce9d224 | PR: #12716

Metric	Current	Baseline	Change
📊 Total Size	5.7 MB	5.7 MB	-8.0 B (-0.0%)
📄 JavaScript	5.7 MB	5.7 MB	-8.0 B (-0.0%)
🎨 CSS	21.0 B	21.0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	0 B	0 B	0

📦 Download Diff Report: react-10k Bundle Diff

📁 react-5k

Path: ../build-tools-performance/cases/react-5k/dist/rsdoctor-data.json

📌 Baseline Commit: 0ddce9d224 | PR: #12716

Metric	Current	Baseline	Change
📊 Total Size	2.7 MB	2.7 MB	+1.0 B (0.0%)
📄 JavaScript	2.7 MB	2.7 MB	+1.0 B (0.0%)
🎨 CSS	21.0 B	21.0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	0 B	0 B	0

📦 Download Diff Report: react-5k Bundle Diff

📁 rome

Path: ../build-tools-performance/cases/rome/dist/rsdoctor-data.json

📌 Baseline Commit: 0ddce9d224 | PR: #12716

Metric	Current	Baseline	Change
📊 Total Size	986.0 KB	984.3 KB	+1.7 KB (0.2%)
📄 JavaScript	986.0 KB	984.3 KB	+1.7 KB (0.2%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	0 B	0 B	0

📦 Download Diff Report: rome Bundle Diff

Generated by Rsdoctor GitHub Action

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing feat/remove-experiments-tla (24f8515) with v2 (b0c7f30)}

Summary

✅ 16 untouched benchmarks
⏩ 1 skipped benchmark¹

Footnotes

1. 1 benchmark was skipped, so the baseline result was used instead. If it was deleted from the codebase, click here and archive it to remove it from the performance reports. ↩