feat: support import.defer() for statical path

[ahabhgk]

Summary

port webpack/webpack#20064

Related links

Checklist

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

[Copilot]

Pull request overview

This pull request adds support for import.defer() with static paths, porting functionality from webpack. The feature enables deferred loading of modules without blocking the main thread, allowing for more efficient code splitting and lazy loading.

Changes:

• Added test cases for import.defer() with both static syntax (import.defer()) and dynamic import syntax in various scenarios
• Refactored runtime symbols from MAKE_DEFERRED_NAMESPACE_OBJECT_SYMBOL to DEFERRED_MODULES_ASYNC_TRANSITIVE_DEPENDENCIES_SYMBOL for better clarity
• Enhanced runtime modules to handle async transitive dependencies in deferred imports
• Extended parser plugins and dependency classes to support the ImportPhase parameter

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/rspack-test/configCases/defer-import/defer-runtime/all-dynamic-import-native-syntax.js	Comprehensive test suite for deferred imports covering CommonJS, ESM, and various export patterns
tests/rspack-test/configCases/defer-import/defer-runtime-dynamic-import-native-syntax/rspack.config.js	Configuration enabling deferImport experiment for dynamic import tests
tests/rspack-test/configCases/defer-import/async-in-graph-dynamic-import/webpack.config.js	Configuration for async dependency graph tests (file naming issue)
tests/rspack-test/configCases/defer-import/async-in-graph-dynamic-import/index.js	Test validating deferred module loading behavior with async dependencies
tests/rspack-test/configCases/defer-import/async-in-graph-dynamic-import/entry.js	Entry point demonstrating deferred imports with async module graph
crates/rspack_plugin_runtime/src/runtime_module/runtime/make_optimized_deferred_namespace_object.ejs	Updated to use renamed async transitive dependencies symbol
crates/rspack_plugin_runtime/src/runtime_module/runtime/async_module.ejs	Added async transitive dependencies function and refactored deferred module handling
crates/rspack_plugin_rstest/src/parser_plugin.rs	Added ImportPhase parameter to dependency creation
crates/rspack_plugin_lazy_compilation/src/module.rs	Added ImportPhase parameter to async dependency creation
crates/rspack_plugin_javascript/src/parser_plugin/import_parser_plugin.rs	Added phase detection, validation, and error messages for defer imports
crates/rspack_plugin_javascript/src/dependency/esm/import_eager_dependency.rs	Added phase field and getter to support defer imports
crates/rspack_plugin_javascript/src/dependency/esm/import_dependency.rs	Added phase field and getter to support defer imports
crates/rspack_core/src/runtime_template.rs	Added deferred module handling logic in module_namespace_promise with async dependency tracking
crates/rspack_core/src/runtime_globals.rs	Renamed and added runtime globals for deferred modules async transitive dependencies

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[github-actions]

Rsdoctor Bundle Diff Analysis

Found 5 projects in monorepo, 0 projects with changes.

📊 Quick Summary

Project	Total Size	Change
react-10k	5.7 MB	0
react-1k	825.5 KB	0
react-5k	2.7 MB	0
rome	984.2 KB	0
ui-components	2.3 MB	0

Generated by Rsdoctor GitHub Action

[github-actions]

📦 Binary Size-limit

Comparing c925c7a to fix: prevent server actions from being removed in production build (#12898) by Cong-Cong Pan

❌ Size increased by 4.50KB from 48.31MB to 48.31MB (⬆️0.01%)

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing statical-path-dyn-import-defer (c925c7a) with main (b7bcbce)}

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. ↩