refactor: export lexical runtime globals for esm chunks

[LingyuCoder]

Summary

• add a lexical runtime-global rendering mode for the ESM output + split runtime chunk case
• export runtime module globals as lexical __rspack_* bindings from the runtime chunk instead of mounting them on __rspack_context
• import those lexical bindings from runtime chunks at ESM library render/link sites, including setter helpers such as __rspack_set_*
• refresh runtime-mode ESM output snapshots

Context

This is stacked on #14740. The base PR only enables the RuntimeModeEsmOutput context import coverage and fixes modern ESM chunk loading. This PR contains the lexical runtime-global export/import behavior needed for tree shaking when downstream consumers depend on the ESM output runtime chunk.

The behavior is scoped to output module builds using Rspack runtime mode with a split modern-module runtime chunk.

Checks

• pnpm run build:binding:dev
• pnpm run test:unit

[github-actions]

📦 Binary Size-limit

Comparing bf0ef18 to fix: respect runtime mode in mf identifiers (#14782) by harpsealjs

❌ Size increased by 73.63KB from 66.55MB to 66.63MB (⬆️0.11%)

[github-actions]

Rsdoctor Bundle Diff Analysis

Found 5 projects in monorepo, 5 projects with changes.

📊 Quick Summary

Project	Total Size	Gzip Size	Change	Gzip Change
popular-libs	1.7 MB	551.5 KB	-	-
react-10k	5.6 MB	1.3 MB	-	-
react-5k	2.7 MB	663.8 KB	-	-
react-1k	823.1 KB	217.0 KB	-	-
ui-components	4.9 MB	1.4 MB	-	-

📋 Detailed Reports (Click to expand)

📁 popular-libs

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

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	1.7 MB	-	-
🗜️ Gzip Size	551.5 KB	-	-
📄 JavaScript	1.7 MB	-	-
🎨 CSS	0 B	-	-
🌐 HTML	289.0 B	-	-
📁 Other Assets	0 B	-	-

📁 react-10k

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

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	5.6 MB	-	-
🗜️ Gzip Size	1.3 MB	-	-
📄 JavaScript	5.6 MB	-	-
🎨 CSS	21.0 B	-	-
🌐 HTML	328.0 B	-	-
📁 Other Assets	0 B	-	-

📁 react-5k

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

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	2.7 MB	-	-
🗜️ Gzip Size	663.8 KB	-	-
📄 JavaScript	2.7 MB	-	-
🎨 CSS	21.0 B	-	-
🌐 HTML	328.0 B	-	-
📁 Other Assets	0 B	-	-

📁 react-1k

Path: ../build-tools-performance/cases/react-1k/dist/rsdoctor-data.json

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	823.1 KB	-	-
🗜️ Gzip Size	217.0 KB	-	-
📄 JavaScript	822.7 KB	-	-
🎨 CSS	0 B	-	-
🌐 HTML	328.0 B	-	-
📁 Other Assets	0 B	-	-

📁 ui-components

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

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	4.9 MB	-	-
🗜️ Gzip Size	1.4 MB	-	-
📄 JavaScript	4.8 MB	-	-
🎨 CSS	112.1 KB	-	-
🌐 HTML	328.0 B	-	-
📁 Other Assets	0 B	-	-

Generated by Rsdoctor GitHub Action

[codspeed-hq]

Merging this PR will improve performance by 2.22%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 42 untouched benchmarks
⏩ 47 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	rust@create_module_hashes	8.5 ms	8.3 ms	+2.22%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing seal/stacked-lexical-runtime-globals (bf0ef18) with main (27ff319)}

Footnotes

1. 47 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩