NeuroLink Dependency Upgrade Report

Date: 2026-02-27 Version: 9.12.1 Branch: fix/security-fixes

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1. Executive Summary

25 packages were analyzed across 4 categories (AI SDK, AWS SDK, Core Libraries, Dev Dependencies). All 25 packages have available upgrades.

Overall Risk Assessment: LOW-MEDIUM

The vast majority of upgrades are low-risk patch and minor version bumps. Only 2 packages carry elevated risk:

• TypeScript 5.0.0 -> 5.9.3 (HIGH risk) -- 10 minor versions spanning 2.5 years with cumulative stricter type checks
• tslib 2.4.1 -> 2.8.1 (MEDIUM risk) -- large jump with decorator hook order change and new exports structure

Key Highlights

Category	Details
Security Fixes	1 direct fix (download size limits in @ai-sdk/provider-utils), 1 dev dependency fix (Fastify CVE-2026-25224), 2 already-patched CVEs in baseline versions
Critical Bug Fixes	Azure streaming tool calls fixed (@ai-sdk/openai 3.0.36), duplicate tool part creation fixed (ai 6.0.101)
New Features	Anthropic code execution tool, Gemini 3.1 image model, gpt-5.3-codex phase parameter, Google server-side MCP, GenAI telemetry conventions
Breaking Changes	Zero breaking changes in production dependencies; TypeScript 5.9 will surface new type errors

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2. Upgrade Priority Matrix

#	Package	Current	Latest	Risk	Priority	Category
1	@ai-sdk/openai	3.0.34	3.0.36	Low	Critical	Bug Fix
2	@ai-sdk/azure	3.0.35	3.0.37	Low	Critical	Bug Fix
3	@ai-sdk/mistral	3.0.12	3.0.20	Low	Critical	Security
4	fastify	5.7.2	5.7.4	Low	High	Security
5	ai	6.0.101	6.0.103	Low	High	Bug Fix
6	@ai-sdk/anthropic	3.0.47	3.0.48	Low	High	Feature
7	@ai-sdk/google	3.0.31	3.0.33	Low	High	Feature
8	@ai-sdk/google-vertex	4.0.63	4.0.66	Low	High	Feature
9	@google/genai	1.42.0	1.43.0	Low	High	Feature
10	undici	>=7.18.2	7.22.0	Low	Medium	Maintenance
11	@opentelemetry/semantic-conventions	1.39.0	1.40.0	Low	Medium	Feature
12	hono	4.12.2	4.12.3	Low	Medium	Maintenance
13	nanoid	5.1.5	5.1.6	Low	Low	Maintenance
14	@aws-sdk/client-bedrock	3.998.0	3.999.0	Low	Low	Maintenance
15	@aws-sdk/client-bedrock-runtime	3.998.0	3.999.0	Low	Low	Maintenance
16	@aws-sdk/client-sagemaker	3.998.0	3.999.0	Low	Low	Maintenance
17	@aws-sdk/client-sagemaker-runtime	3.998.0	3.999.0	Low	Low	Maintenance
18	@semantic-release/npm	13.1.2	13.1.4	Low	Low	Maintenance
19	@sveltejs/kit	2.53.2	2.53.3	Low	Low	Maintenance
20	@types/node	25.3.1	25.3.2	Low	Low	Maintenance
21	svelte-check	4.4.3	4.4.4	Low	Low	Maintenance
22	@ai-sdk/provider	3.0.8	3.0.8	None	None	Up to date
23	tslib	2.4.1	2.8.1	Medium	Medium	Maintenance
24	typescript	5.0.0	5.9.3	High	Medium	Maintenance
25	@langfuse/otel	4.6.1	latest	Low	Low	Maintenance

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3. Security Fixes

Direct Security Fix: Download Size Limits (provider-utils 4.0.15)

Field	Value
Severity	Medium (DoS prevention)
Package	@ai-sdk/provider-utils 4.0.15 (transitive, pulled in via @ai-sdk/mistral 3.0.20)
Description	download() and downloadBlob() now enforce a default 2 GiB size limit on user-provided URLs. Downloads exceeding the limit abort with DownloadError. abortSignal properly passed to fetch().
Are we affected?	Yes. NeuroLink passes user-provided URLs to generateText()/streamText() (e.g., image URLs). Without this fix, a malicious URL could cause memory exhaustion (DoS).
Fix	Upgrade @ai-sdk/mistral to 3.0.20. All other AI SDK packages will transitively receive this fix.

Dev Dependency Security Fix: Fastify CVE-2026-25224

Field	Value
CVE	CVE-2026-25224 (GHSA-mrq3-vjjr-p77c)
Severity	Not yet scored
Package	fastify 5.7.3+
Description	Security fix related to Reply.send() string serialization.
Are we affected?	Fastify is a devDependency used as a server adapter (src/lib/server/). Low production risk, but important to patch.
Fix	Upgrade fastify to 5.7.4.

Already Patched (in current baseline versions)

CVE	Severity	Package	Description	Status
CVE-2025-48985	Low	AI SDK	Input validation bypass allowing URL-to-data substitution in multimodal prompts	Fixed in versions prior to our baseline (6.0.101+). Not a concern.
CVE-2026-22036	Low (CVSS 3.7)	undici	Unbounded decompression chain in HTTP Content-Encoding causing CPU/memory exhaustion	Fixed in 7.18.2 (our current minimum). Not a concern.
CVE-2026-27700	High (CVSS 8.2)	hono	Authentication bypass by IP spoofing in AWS Lambda ALB conninfo	Fixed in 4.12.2 (our current version). NeuroLink does not use the affected Lambda adapter.

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4. Per-Package Detailed Analysis

AI SDK Packages (7 packages)

4.1 @ai-sdk/openai (3.0.34 -> 3.0.36)

Field	Details
What changed	v3.0.36: Fixed streaming tool call handling for Azure AI Foundry/Mistral (null/undefined type fields now treated as "function"). v3.0.35: Enhanced reasoning content fallback for Responses API (uses encrypted_content when itemId absent). v3.0.34: Added phase parameter support for gpt-5.3-codex model.
Breaking changes	None
New features for NeuroLink	The streaming fix (3.0.36) resolves existing failures for Azure-deployed Mistral models. The phase parameter (3.0.34) is required for correct gpt-5.3-codex behavior -- dropping it causes performance degradation. Consider exposing phase in NeuroLink response objects.
Codebase impact	src/lib/providers/openAI.ts, src/lib/providers/huggingFace.ts, src/lib/providers/litellm.ts, src/lib/providers/openaiCompatible.ts -- all use createOpenAI factory. No code changes required.
Risk level	Low
Recommendation	Upgrade immediately. Fixes active bugs.

4.2 @ai-sdk/azure (3.0.35 -> 3.0.37)

Field	Details
What changed	Three dependency-only bumps pulling in @ai-sdk/openai 3.0.34-3.0.36. No Azure-specific code changes.
Breaking changes	None
New features for NeuroLink	Inherits all @ai-sdk/openai improvements (streaming tool call fix, reasoning fallback, phase parameter).
Codebase impact	src/lib/providers/azureOpenai.ts -- uses createAzure factory. No code changes required.
Risk level	Low
Recommendation	Upgrade alongside @ai-sdk/openai.

4.3 @ai-sdk/anthropic (3.0.47 -> 3.0.48)

Field	Details
What changed	v3.0.48: Added code execution tool support (Anthropic sandbox). v3.0.47 (already current): Improved cacheControl placement for prompt caching.
Breaking changes	None
New features for NeuroLink	Code execution tool could be exposed as a built-in tool option for Anthropic users, similar to MCP tool handling. Prompt caching now works more reliably (automatic benefit).
Codebase impact	src/lib/providers/anthropic.ts, src/lib/providers/anthropicBaseProvider.ts -- both use createAnthropic factory. No code changes required.
Risk level	Low
Recommendation	Upgrade. Consider adding code execution tool integration.

4.4 @ai-sdk/google (3.0.31 -> 3.0.33)

Field	Details
What changed	v3.0.33: Added image model aspect ratios/sizes. v3.0.32: Added gemini-3.1-flash-image-preview model support. v3.0.31: Expanded model ID type definitions.
Breaking changes	None
New features for NeuroLink	Gemini 3.1 Flash Image Preview model for image generation. More granular image output dimensions. Consider adding the model to NeuroLink's model definitions.
Codebase impact	src/lib/providers/googleAiStudio.ts -- uses createGoogleGenerativeAI factory. No code changes required.
Risk level	Low
Recommendation	Upgrade. Add gemini-3.1-flash-image-preview to model definitions.

4.5 @ai-sdk/google-vertex (4.0.63 -> 4.0.66)

Field	Details
What changed	Four dependency-only bumps pulling in updated @ai-sdk/google and @ai-sdk/anthropic. v4.0.64 added gemini-3.1-flash-image-preview model support for Vertex.
Breaking changes	None
New features for NeuroLink	Same Gemini 3.1 image model support through Vertex AI. Anthropic code execution tool via Vertex.
Codebase impact	src/lib/providers/googleVertex.ts -- uses createVertex and createVertexAnthropic factories, including the /anthropic sub-path import. No code changes required.
Risk level	Low
Recommendation	Upgrade alongside other AI SDK packages.

4.6 @ai-sdk/mistral (3.0.12 -> 3.0.20)

Field	Details
What changed	8 version bumps, almost entirely dependency updates. Carries the security fix via @ai-sdk/provider-utils 4.0.15 (download size limits). Also includes Bun compatibility, better error messages, and video model resolution support from transitive dependencies.
Breaking changes	None
New features for NeuroLink	Download size limit enforcement (2 GiB default) prevents memory exhaustion DoS. Bun fetch errors now retryable. Better type validation error messages.
Codebase impact	src/lib/providers/mistral.ts -- uses createMistral factory. src/lib/factories/providerRegistry.ts -- type-only import. No code changes required.
Risk level	Low
Recommendation	Upgrade immediately for security fix.

4.7 ai (6.0.101 -> 6.0.103)

Field	Details
What changed	v6.0.101: Fixed duplicate tool part creation when models invoke non-existent tools. v6.0.102-103: Gateway dependency bumps.
Breaking changes	None
New features for NeuroLink	The duplicate tool part fix improves reliability of the tool execution pipeline, especially with less capable models that may hallucinate tool names.
Codebase impact	Used across 30+ files (GenerationHandler.ts, ToolsManager.ts, all provider implementations, middleware, message builders, type definitions). No code changes required -- these are bug fixes.
Risk level	Low
Recommendation	Upgrade. Improves tool execution reliability.

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AWS SDK Packages (4 packages)

4.8-4.11 AWS SDK Packages (3.998.0 -> 3.999.0)

All four AWS SDK packages (@aws-sdk/client-bedrock, @aws-sdk/client-bedrock-runtime, @aws-sdk/client-sagemaker, @aws-sdk/client-sagemaker-runtime) received version-bump-only updates. No new features, no bug fixes, no breaking changes in any of the Bedrock or SageMaker client packages.

Package	Codebase Impact	Risk
@aws-sdk/client-bedrock	src/lib/providers/amazonBedrock.ts -- BedrockClient, ListFoundationModelsCommand	Low
@aws-sdk/client-bedrock-runtime	src/lib/providers/amazonBedrock.ts -- BedrockRuntimeClient, ConverseCommand, ConverseStreamCommand	Low
@aws-sdk/client-sagemaker	src/cli/factories/sagemakerCommandFactory.ts -- SageMakerClient, ListEndpointsCommand	Low
@aws-sdk/client-sagemaker-runtime	src/lib/providers/sagemaker/client.ts -- SageMakerRuntimeClient, InvokeEndpointCommand	Low

SDK-wide change: util-user-agent-node now populates TypeScript version in user-agent headers (non-breaking telemetry improvement).

Recommendation: Upgrade all 4 together. No code changes required.

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Google & Core Libraries (5 packages)

4.12 @google/genai (1.42.0 -> 1.43.0)

Field	Details
What changed	Added gemini-3.1-pro-preview model. Added Image Grounding for GoogleSearch tool. Enabled server-side MCP support. More image sizes/resolutions. Breaking: interactions media mime type changed from string to enum (experimental Interactions API only).
Breaking changes	Interactions API mime type enum change -- does NOT affect NeuroLink (we use standard generate/stream APIs, not experimental Interactions).
New features for NeuroLink	Server-side MCP support is directly relevant -- could enable passing MCP server configs to the Google API rather than handling tool calls client-side. Gemini 3.1 Pro Preview model. Image Grounding for GoogleSearch.
Codebase impact	src/lib/providers/googleAiStudio.ts, src/lib/providers/googleVertex.ts, src/lib/adapters/video/videoAnalyzer.ts -- all use dynamic imports. No code changes required.
Risk level	Low
Recommendation	Upgrade. Explore server-side MCP integration opportunities.

4.13 undici (>=7.18.2 -> 7.22.0)

Field	Details
What changed	4 minor + 2 patch releases. Key changes: fixed 401 loop in fetch (7.19.1), proper 401 response handling (7.19.2), HTTP/2 flow-control options (7.19.0), preserved fetch stack traces (7.20.0), pingInterval keep-alive (7.21.0), proxy agent enhancements (7.22.0), __filename bundling fix (7.21.0).
Breaking changes	None within v7.x.
New features for NeuroLink	401 loop fix and proxy agent enhancements directly benefit proxyFetch.ts and awsProxyIntegration.ts. HTTP/2 flow-control could benefit Vertex AI streaming. Stack trace preservation improves debugging.
Codebase impact	src/lib/utils/messageBuilder.ts, src/lib/utils/fileDetector.ts -- getGlobalDispatcher, interceptors, request. src/lib/proxy/proxyFetch.ts -- ProxyAgent. No code changes required.
Risk level	Low
Recommendation	Upgrade. Many quality-of-life fixes for proxy/fetch infrastructure.

4.14 @opentelemetry/semantic-conventions (1.39.0 -> 1.40.0)

Field	Details
What changed	2 new stable attributes (ATTR_SERVICE_INSTANCE_ID, ATTR_SERVICE_NAMESPACE). 157 new unstable attributes including GenAI cache tokens, tool call support, MCP protocol, and OpenAI API type. 40 unstable deprecations.
Breaking changes	None affecting NeuroLink. We only use ATTR_SERVICE_NAME and ATTR_SERVICE_VERSION (stable, unchanged).
New features for NeuroLink	New GenAI semantic convention attributes (gen_ai.agent.version, cache token attributes, MCP protocol support) are directly relevant to NeuroLink's telemetry and could enable richer observability.
Codebase impact	src/lib/telemetry/telemetryService.ts, src/lib/services/server/ai/observability/instrumentation.ts -- only ATTR_SERVICE_NAME and ATTR_SERVICE_VERSION. No code changes required.
Risk level	Low
Recommendation	Upgrade. Consider adopting GenAI/MCP telemetry attributes in a follow-up.

4.15 hono (4.12.2 -> 4.12.3)

Field	Details
What changed	Bug fixes: form data type diff, safer JWT timestamp handling (Math.floor instead of bitwise OR), JwtVariables compatibility, removed DOM type dependencies, corrected middleware types, fixed JWT memory leak.
Breaking changes	None
New features for NeuroLink	Memory leak fix in JWT operations. Removal of DOM type dependencies improves Node.js-only TypeScript compatibility.
Codebase impact	src/lib/server/adapters/honoAdapter.ts -- Hono, cors, HTTPException, logger, secureHeaders, streamSSE, timeout. No code changes required.
Risk level	Low
Recommendation	Upgrade.

4.16 nanoid (5.1.5 -> 5.1.6)

Field	Details
What changed	Fixed infinite loop when passing 0 as size to customAlphabet().
Breaking changes	None
New features for NeuroLink	None directly. NeuroLink always calls nanoid() without arguments (default 21-char IDs), never customAlphabet.
Codebase impact	src/lib/core/modules/StreamHandler.ts, src/lib/core/modules/TelemetryHandler.ts, src/lib/session/globalSessionState.ts. No code changes required.
Risk level	Low
Recommendation	Upgrade. Trivial zero-risk patch.

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Dev Dependencies (8 packages)

4.17 @semantic-release/npm (13.1.2 -> 13.1.4)

Field	Details
What changed	Internal @actions/core updated from v1 to v3 across two releases.
Breaking changes	None
Risk level	Low
Recommendation	Upgrade. No API changes.

4.18 @sveltejs/kit (2.53.2 -> 2.53.3)

Field	Details
What changed	Fix to prevent overlapping file metadata in remote functions form.
Breaking changes	None
Risk level	Low
Recommendation	Upgrade. Patch-level bug fix.

4.19 @types/node (25.3.1 -> 25.3.2)

Field	Details
What changed	Incremental type definition refinements for Node.js 25.x APIs.
Breaking changes	None
Risk level	Low
Recommendation	Upgrade. Type-only, no runtime impact.

4.20 fastify (5.7.2 -> 5.7.4)

Field	Details
What changed	v5.7.3: Security fix for CVE-2026-25224 (GHSA-mrq3-vjjr-p77c) related to Reply.send() string serialization. v5.7.4: Follow-up patch.
Breaking changes	None
Codebase impact	Dev dependency used in src/lib/server/ adapter layer.
Risk level	Low
Recommendation	Upgrade. Security patch.

4.21 svelte-check (4.4.3 -> 4.4.4)

Field	Details
What changed	More robust lang="ts" detection, filename passed to warningFilter, Svelte file resolution under path alias in --incremental/tsgo mode.
Breaking changes	None
Risk level	Low
Recommendation	Upgrade. Path alias resolution improvement benefits NeuroLink's $lib aliases.

4.22 tslib (2.4.1 -> 2.8.1)

Field	Details
What changed	Major feature additions over 10 releases: using/await using helpers (2.6.0), rewriteRelativeImportExtensions helper (2.8.0), decorator init hook order reversed (2.5.1), improved exports field for node16/bundler resolution (2.5.1), non-enumerable keys in __importStar (2.8.1).
Breaking changes	Decorator init hook order reversed in 2.5.1 (matches spec). exports field restructured in 2.5.1.
Codebase impact	Dev dependency only. importHelpers is NOT enabled in tsconfig, so tslib may not actually be used at runtime. No direct imports found in src/.
Risk level	Medium (due to version jump size), but effectively Low since it appears unused at runtime.
Recommendation	Upgrade. Run full test suite after.

4.23 typescript (5.0.0 -> 5.9.3)

Field	Details
What changed	10 minor versions spanning June 2023 to August 2025. Adds using/await using (5.2), NoInfer<T> (5.4), inferred type predicates (5.5), disallowed nullish/truthy checks (5.6), --rewriteRelativeImportExtensions (5.7), --erasableSyntaxOnly (5.8), import defer (5.9), and cumulative performance improvements.
Breaking changes	Multiple. Always-truthy/nullish checks now error (5.6). Stricter generic constraint null checks (5.9). Uninitialized variable checks (5.7). Conditional return type checks (5.8). BuiltinIterator renamed to IteratorObject (5.6). Numerous lib.d.ts changes. ArrayBuffer no longer supertype of Buffer (5.9).
Codebase impact	All .ts files potentially. TypeScript strict mode is already enabled. skipLibCheck: true mitigates .d.ts issues. Run pnpm run check after upgrade to identify all new errors.
Risk level	High
Recommendation	Dedicate a separate effort. See Phase 4 in Recommended Upgrade Plan.

4.24 @langfuse/otel (4.6.1 -> latest)

Field	Details
What changed	Ongoing improvements to the Langfuse OpenTelemetry span processor.
Breaking changes	None expected within minor versions.
Codebase impact	src/lib/services/server/ai/observability/instrumentation.ts -- LangfuseSpanProcessor. Single import.
Risk level	Low
Recommendation	Upgrade alongside OpenTelemetry packages.

4.25 @ai-sdk/provider (3.0.8 -- already current)

Field	Details
What changed	N/A -- already at latest.
Codebase impact	src/lib/types/evaluationTypes.ts -- LanguageModelV3CallOptions type-only import.
Risk level	None
Recommendation	No action needed.

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5. New Features & Opportunities

Sorted by estimated business value to NeuroLink:

High Value

Feature	Package	Version	Description
Azure streaming tool call fix	@ai-sdk/openai	3.0.36	Fixes InvalidResponseDataError for Azure AI Foundry/Mistral deployments during streaming tool calls. Resolves existing user-facing failures.
Download size limit (DoS prevention)	@ai-sdk/provider-utils	4.0.15	2 GiB default size limit prevents memory exhaustion from malicious URLs. Security hardening for production.
gpt-5.3-codex phase parameter	@ai-sdk/openai	3.0.34	Required for correct gpt-5.3-codex behavior. Dropping phase causes performance degradation.
Google server-side MCP	@google/genai	1.43.0	Pass MCP server configs directly to Google API instead of client-side tool handling. Aligns with NeuroLink's MCP architecture.
Anthropic code execution tool	@ai-sdk/anthropic	3.0.48	Sandbox code execution. Can be exposed as a built-in tool option for Anthropic users.

Medium Value

Feature	Package	Version	Description
Gemini 3.1 models	@ai-sdk/google, @google/genai	3.0.32+, 1.43.0	gemini-3.1-flash-image-preview and gemini-3.1-pro-preview models. Add to model definitions.
Image Grounding for GoogleSearch	@google/genai	1.43.0	Multimodal search capabilities via GoogleSearch tool.
GenAI telemetry conventions	@opentelemetry/semantic-conventions	1.40.0	Cache token attributes, MCP protocol attributes, tool call support for richer observability.
Proxy/fetch improvements	undici	7.19-7.22	401 loop fix, proxy agent enhancements, HTTP/2 flow-control, stack trace preservation.

Lower Value (Future)

Feature	Package	Version	Description
Inferred type predicates	typescript	5.5+	.filter() calls now properly narrow types. Catches bugs.
NoInfer<T>	typescript	5.4+	Useful in factory/registry generics.
using/await using	typescript	5.2+	Explicit resource management for MCP connections, Redis, etc.
import defer	typescript	5.9	Deferred module evaluation aligns with NeuroLink's dynamic import pattern.
Experimental video support	@ai-sdk/provider	3.0.7+	generateVideo support in provider interface (experimental).

---

6. Recommended Upgrade Plan

Phase 1: Zero-Risk Patches (Do Immediately)

Estimated effort: 30 minutes Strategy: Batch update, run tests once

Package	From	To	Reason
@ai-sdk/openai	3.0.34	3.0.36	Fixes Azure streaming failures
@ai-sdk/azure	3.0.35	3.0.37	Dependency alignment
@ai-sdk/anthropic	3.0.47	3.0.48	Code execution tool
@ai-sdk/google	3.0.31	3.0.33	Image model support
@ai-sdk/google-vertex	4.0.63	4.0.66	Dependency alignment
@ai-sdk/mistral	3.0.12	3.0.20	Security fix
ai	6.0.101	6.0.103	Bug fix for duplicate tool parts
nanoid	5.1.5	5.1.6	Trivial patch
hono	4.12.2	4.12.3	Memory leak fix

Verification:

pnpm install
pnpm test
pnpm run test:providers

Phase 2: Low-Risk Upgrades (Batch Together)

Estimated effort: 1 hour Strategy: Batch update by group, run targeted tests

Group A -- AWS SDK (upgrade together):

Package	From	To
@aws-sdk/client-bedrock	3.998.0	3.999.0
@aws-sdk/client-bedrock-runtime	3.998.0	3.999.0
@aws-sdk/client-sagemaker	3.998.0	3.999.0
@aws-sdk/client-sagemaker-runtime	3.998.0	3.999.0

Group B -- Core libs & Google:

Package	From	To
@google/genai	1.42.0	1.43.0
undici	>=7.18.2	7.22.0
@opentelemetry/semantic-conventions	1.39.0	1.40.0

Group C -- Dev dependencies:

Package	From	To
@semantic-release/npm	13.1.2	13.1.4
@sveltejs/kit	2.53.2	2.53.3
@types/node	25.3.1	25.3.2
fastify	5.7.2	5.7.4
svelte-check	4.4.3	4.4.4
@langfuse/otel	4.6.1	latest

Verification:

pnpm install
pnpm test
pnpm run test:providers
pnpm run test:cli
pnpm run test:integration
pnpm run build

Phase 3: Medium-Risk Upgrades (Test Carefully)

Estimated effort: 2 hours Strategy: Upgrade one at a time, test after each

Package	From	To	Key Concern
tslib	2.4.1	2.8.1	Decorator hook order, exports field changes. Likely unused at runtime (importHelpers not enabled).

Verification:

pnpm install
pnpm run build:complete
pnpm test
pnpm run check

Phase 4: High-Risk Upgrades (Dedicated Effort)

Estimated effort: 1-2 days Strategy: Separate branch, dedicated type error resolution

Package	From	To	Key Concern
typescript	5.0.0	5.9.3	10 minor versions with cumulative stricter checks. Will surface new type errors.

Migration steps:

1. Create a dedicated branch: chore/typescript-5.9-upgrade
2. Update typescript to 5.9.3 in package.json
3. Run pnpm install
4. Run tsc --noEmit and catalog all new errors
5. Fix errors in order of severity (type errors first, then new warnings)
6. Pay special attention to:
   • Always-truthy/nullish checks (TS 5.6) -- likely the most common new errors
   • Uninitialized variable checks (TS 5.7)
   • Stricter conditional return types (TS 5.8)
   • Generic constraint null checks (TS 5.9)
   • ArrayBuffer/Buffer relationship changes (TS 5.9)
7. Run full test suite: pnpm test
8. Run full type check: pnpm run check
9. Run full build: pnpm run build:complete
10. Consider using --noCheck flag (TS 5.6) as a temporary escape hatch if needed during migration

---

7. Risk Mitigation

Testing Strategy

Phase	Test Coverage	Commands
Phase 1	Provider unit tests + full test suite	pnpm test && pnpm run test:providers
Phase 2	Full test suite + CLI + integration + build	pnpm test && pnpm run test:cli && pnpm run test:integration && pnpm run build
Phase 3	Full test suite + type check + complete build	pnpm test && pnpm run check && pnpm run build:complete
Phase 4	Type check (first), then full suite + complete build	pnpm run check && pnpm test && pnpm run build:complete && pnpm run validate:all

Rollback Plan

Each phase should be committed separately so rollback is straightforward:

1. Phase 1-3 rollback: Revert the commit, run pnpm install. These are all backward-compatible changes, so reverting is clean.
2. Phase 4 rollback (TypeScript): Since TypeScript 5.9 upgrade involves source code changes (fixing new type errors), keep the upgrade on a separate branch. If issues are discovered post-merge, revert both the package.json change and the type fix commits.

Pre-Upgrade Checklist

• Ensure CI is green on current branch
• Create a snapshot of current pnpm-lock.yaml
• Run pnpm run validate:all before starting
• After each phase: pnpm run validate:security

Post-Upgrade Validation

• All tests pass (pnpm test)
• Type checking passes (pnpm run check)
• Build succeeds (pnpm run build:complete)
• Security validation passes (pnpm run validate:security)
• ESLint within warning budget (300 src, 10 test)
• No new no-explicit-any errors in src/

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Generated by automated dependency research pipeline. Research sources: npm registry, GitHub changelogs, CVE databases, and codebase static analysis.