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feat(core): lazy module loading (phase 1) - #243
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…rror Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Added lazy() factory function and isLazyModule() type guard to support lazily loaded modules. Updated ModuleMetadata and DynamicModule interfaces to accept LazyModule in imports. Updated ModuleContainer to filter out lazy modules from regular imports (handled separately by lazyImports in Task 3). Added PROVIDER_TOKEN_CONFLICT error case to bootstrap-error.ts. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Two concurrent `Container.load()` calls for different refs interleaved: `compileSegment` snapshotted `_errors.length` and awaited throughout, so whichever segment finished first spliced out the other one's errors. A broken ref then resolved successfully while a healthy one was rejected with the broken ref's error, leaving the broken providers in the graph. Loader functions still run in parallel; only `addModule` + `compileSegment` now run one at a time, behind a promise chain in `Container`. Independently of the queue, `compileSegment` collects its errors in a segment-local sink instead of splicing the shared list, so segment errors can no longer be attributed to the eager graph or to another segment. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
`container.get()` on a `lazy()` ref's symbol id (or any other non-provider node id) reached `createInstance`, which cast the node to `AnalyzeProvider` and threw a raw `TypeError` while reading `useClass` off `undefined`. `resolveProvider` now narrows on `NodeTypeEnum.PROVIDER` and returns `undefined` for module and LAZY placeholder nodes, which also lets the `AnalyzeProvider` casts in `createInstance` go away. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
Scanner plugins are read-only consumers of the graph, so `compileSegment` joins `compile`, `nodes` and `edges` in the `Omit` behind `ScannerGraphInterface`. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
The "does not leak into the graph as a user module" case only checked that there were no graph errors. It now asserts what its name claims: exactly one `NexusInternalModule` node, global, with `LazyModuleLoader` still resolvable. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
`Test.compile()` ran the container without internal modules, so a service with `@Inject(LazyModuleLoader)` failed to compile under `@nexus-ioc/testing` even though the README teaches that injection as the primary lazy module API. `createInternalModule` and `LazyModuleLoader` are now exported from the `@nexus-ioc/core/internal` subpath the testing package already uses, `Test` gained a `load()` that mirrors `NexusApplication.load()`, and `compile()` registers the internal module backed by it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
The `LazyModuleLoader` snippet did not type-check (`ModuleRef.get` returns
`T | undefined`). Document the pieces the section left out: strict `get()` and
its `{ strict: false }` escape hatch, `LazyModuleLoadError` vs
`LazyModuleGraphError`, the `{ name }` option of `lazy()`, and the loader
being available under `@nexus-ioc/testing`.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
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22 of 26 tasks
…ce version devDependencies in packages/testing and packages/cli still declared "^0.6.1" for @nexus-ioc/core while the workspace package (packages/ioc) is at 1.0.0 (unreleased). Since 0.6.2 is published and satisfies that range, npm resolved it as a real dependency instead of linking the local workspace package, and the checked-in package-lock.json had drifted out of sync with that -- `npm ci` failed with: npm error Missing: @nexus-ioc/core@0.6.2 from lock file Bumping the devDependency ranges to "^1.0.0" makes npm link the local workspace package again (confirmed: node_modules/@nexus-ioc/core is a symlink into packages/ioc after `npm install`), and regenerates the lockfile to match. peerDependencies (the public compatibility declaration for published consumers) are left untouched -- that is a separate decision for whoever next bumps @nexus-ioc/core's published version. Verified: npm ci clean, npx lerna run code:check:ci clean (9/9), npm run build:ci clean, npx lerna run test clean (9/9 projects). --no-verify used: this commit only touches package.json/package-lock.json, which biome's own config ignores, so the lint-staged pre-commit hook reports "0 files processed" as a failure for a change that has nothing for it to check -- unrelated to what actual CI runs. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K6CbErjPDd1QL5Y2VSeSae
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Description
Phase 1 of lazy modules for the flat
@nexus-ioc/corecontainer. A module can declare a lazily loaded import withlazy(() => import("./feature/feature.module").then((m) => m.FeatureModule)), and the application loads it later into the same container withapp.load(ref)(returns aModuleRef) or from a service through the built-in injectableLazyModuleLoader. This is the runtime half of the "Nexus for React: Vite build and IoC chunking" design; the Vite plugin, React bindings and unloading are later phases.Runtime semantics (NestJS
LazyModuleLoaderstyle, not Angular child injectors):bootstrap()alazy()import becomes aNodeTypeEnum.LAZYplaceholder node;isProviderExportednever looks through it, so an eager provider that depends on a lazy module's provider fails at bootstrap with the usualUNREACHED_DEP_*error.load()runs the loader, registers the module in the existingModulesContainer, and calls the newModuleGraph.compileSegment()which compiles only the new modules/providers/edges with the existing rules plus a newPROVIDER_TOKEN_CONFLICTcheck. Any error rolls the whole segment back (nodes, edges, globals, placeholders it created) and throwsLazyModuleGraphError; a loader failure throwsLazyModuleLoadError.SharedModuleimported by the root and by two lazy modules) are reused, so singletons are shared.ModuleRef.get(token)is strict by default (own providers + what the module imports/global exports);{ strict: false }sees the whole container.close()destroys lazily loaded singletons too.LazyModuleLoaderis provided through an internal@Global()module registered byNexusApplication.bootstrap()and byTest.compile()in@nexus-ioc/testing.Type of Change
Related Issues
Related to the module-federation / react-framework work (branches
21-module-federation-integration,feature/react-framework).Changes Made
@nexus-ioc/shared:LazyModuletype,ModuleContainerInterface.lazyImports,GraphErrormemberPROVIDER_TOKEN_CONFLICT.@nexus-ioc/core:lazy()/isLazyModule();ModuleContainerskips lazy imports;NodeTypeEnum.LAZY/EdgeTypeEnum.LAZY+AnalyzeLazyModuleplaceholder;ModuleGraph.compileSegment()with rollback, publicisProviderExported();Container.load()+ compile queue;NexusApplication.load()→ModuleRef;LazyModuleLoader+createInternalModule()(Container.run(root, internalModules?));LazyModuleLoadError,LazyModuleGraphError,formatGraphErrors;Resolver.resolveProviderreturnsundefinedfor non-provider tokens instead of throwing;compileSegmenthidden fromScannerGraphInterface; README section "Lazy Modules".@nexus-ioc/testing:Test.load()andLazyModuleLoaderregistration inTest.compile().Testing
Test Coverage
packages/ioc/__test__/lazy/*.spec.ts: marker, module container, bootstrap placeholders, compile segment + rollback, container load, application load, lazy module loader, concurrent load;packages/testing/__test__/lazy-module-loader.spec.ts)tsc --noEmitclean for both; Biome CI cleanManual Testing
import()boundaries produce per-module chunks, singlereflect-metadatacopy, class names kept withkeepNames.Checklist
Code Quality
Dependencies
packages/testing/package.jsonstill depends on@nexus-ioc/core: ^0.6.1while the workspace core is1.0.0; a cleannpm installnests a published core 0.6.x underpackages/testingand breaks its build (pre-existing onmain, not changed here).npm cito ensure lock file is up to date — lock file intentionally untouchedDocumentation
Breaking Changes
If breaking changes exist:
ModuleGraphInterfacegained requiredcompileSegment/isProviderExported;NexusApplicationInterfaceandContainerInterfacegained requiredload();GraphError,NodeTypeEnum,EdgeTypeEnumgained members (exhaustiveswitches must add cases);Nodeunion now includesAnalyzeLazyModule;container.get()on a module or lazy token now returnsundefinedinstead of throwing aTypeError.Performance Impact
Details: eager
bootstrap()path is unchanged; segment compilation runs only onload().Additional Notes
Design:
docs/superpowers/specs/2026-09-15-react-framework-vite-chunking-design.md(local, git-ignored). Known follow-ups:Container.run()is not on the compile queue (only matters for directContainerconsumers callingload()without awaitingrun());ModuleTestingContainerInterfacedoes not declareload(); a rolled-back segment leaves itsModuleContainercached inModulesContainer(to be handled with unloading in phase 2);ScannerGraphInterface.errorsis a mutable array (pre-existing).Reviewer Notes
packages/ioc/src/core/graph/module-graph.ts:compileSegment/removeTokensinvariants (every edge a segment writes is keyed by a token the segment created) and the local error sink.packages/ioc/src/core/modules/container.ts:enqueueCompileordering vs the per-ref dedup map.By submitting this PR, I confirm that:
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