Bump typescript from 4.9.5 to 5.9.3

[dependabot]

Bumps typescript from 4.9.5 to 5.9.3.

Release notes

Sourced from typescript's releases.

TypeScript 5.9.3

Note: this tag was recreated to point at the correct commit. The npm package contained the correct content.

For release notes, check out the release announcement

• fixed issues query for Typescript 5.9.0 (Beta).
• fixed issues query for Typescript 5.9.1 (RC).
• No specific changes for TypeScript 5.9.2 (Stable)
• fixed issues query for Typescript 5.9.3 (Stable).

Downloads are available on:

• npm

TypeScript 5.9

Note: this tag was recreated to point at the correct commit. The npm package contained the correct content.

For release notes, check out the release announcement

• fixed issues query for Typescript 5.9.0 (Beta).
• fixed issues query for Typescript 5.9.1 (RC).
• No specific changes for TypeScript 5.9.2 (Stable)

Downloads are available on:

• npm

TypeScript 5.9 RC

Note: this tag was recreated to point at the correct commit. The npm package contained the correct content.

For release notes, check out the release announcement

• fixed issues query for Typescript 5.9.0 (Beta).
• fixed issues query for Typescript 5.9.1 (RC).

Downloads are available on:

• npm

TypeScript 5.9 Beta

Note: this tag was recreated to point at the correct commit. The npm package contained the correct content.

For release notes, check out the release announcement.

• fixed issues query for Typescript 5.9.0 (Beta).

Downloads are available on:

• npm

TypeScript 5.8.3

Note: this tag was recreated to point at the correct commit. The npm package contained the correct content.

... (truncated)

Commits

• c63de15 Bump version to 5.9.3 and LKG
• 8428ca4 🤖 Pick PR #62438 (Fix incorrectly ignored dts file fr...) into release-5.9 (#...
• a131cac 🤖 Pick PR #62351 (Add missing Float16Array constructo...) into release-5.9 (#...
• 0424333 🤖 Pick PR #62423 (Revert PR 61928) into release-5.9 (#62425)
• bdb641a 🤖 Pick PR #62311 (Fix parenthesizer rules for manuall...) into release-5.9 (#...
• 0d9b9b9 🤖 Pick PR #61978 (Restructure CI to prepare for requi...) into release-5.9 (#...
• 2dce0c5 Intentionally regress one buggy declaration output to an older version (#62163)
• 5be3346 Bump version to 5.9.2 and LKG
• ad825f2 Bump version to 5.9.1-rc and LKG
• 463a5bf Update LKG
• Additional commits viewable in compare view

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[austenstone]

🔍 Dependabot Dependency Analysis: TypeScript 4.9.5 → 5.9.3

⚠️ CRITICAL COMPATIBILITY ISSUE DETECTED

---

📋 Summary of Changes

Dependency: TypeScript (development dependency)
Current Version: 4.9.5
Proposed Version: 5.9.3
Update Type: Major version update (semver-major)
Package Ecosystem: npm

This update spans multiple major versions of TypeScript:

• 4.9.5 → 5.0.x (Major)
• 5.0.x → 5.1.x → 5.2.x → ... → 5.9.3 (Multiple minor releases)

---

🚨 BREAKING: Angular 15 Incompatibility

This update CANNOT be merged as-is.

According to official Angular compatibility documentation:

• Angular 15.2.x supports: TypeScript >=4.8.2 and <5.0.0
• TypeScript 5.9.3 requires: Angular 20.x or higher

Your project is using Angular 15.2.8, which explicitly does NOT support TypeScript 5.x.

Expected Result if Merged:

• ❌ Compilation errors from Angular compiler
• ❌ Build failures due to strict version enforcement
• ❌ Potential runtime issues with type definitions

---

🔒 Security Assessment

✅ No security vulnerabilities identified in either version

• CVSS Score: 0
• No GHSA alerts
• No CVE associations

---

⚠️ Breaking Changes (TypeScript 4.9 → 5.9)

Major Breaking Changes:

1. Decorators Standardization (TS 5.0)

   • New ECMAScript Stage 3 decorators standard
   • May affect Angular components if using experimental decorators
   • Angular projects typically use --experimentalDecorators, which still works

2. Module Resolution Updates (TS 5.0)

   • New --moduleResolution bundler option
   • exports field now prioritized over typesVersions in package.json

3. Minimum Node.js Version (TS 5.0+)

   • Requires Node.js >=14.17 (was >=4.2.0)
   • Current project likely already compatible

4. Stricter Type Checking

   • Enhanced type inference for promises and async operations
   • More accurate this type inference
   • Stricter generic type constraints

5. Package Resolution Changes

   • The detected package-lock.json shows @ngtools/webpack peer dependency requires "typescript": ">=4.8.2 <5.0"
   • This will cause peer dependency conflicts

---

🚀 New Features/Improvements (If Compatible)

TypeScript 5.x introduces:

• Decorators: Full ECMAScript decorators support
• Performance: 10-20% faster compilation in some scenarios
• const Type Parameters: Better const assertion handling
• Enum Improvements: Better const enum handling
• JSDoc @Satisfies: Enhanced JSDoc support
• Switch(true) Narrowing: Improved control flow analysis

---

📝 Migration Requirements

To safely use TypeScript 5.9.3, you must:

1. Upgrade Angular to a compatible version:

   • For TS 5.0-5.1: Angular 16.x minimum
   • For TS 5.9: Angular 20.x minimum

2. Update all Angular dependencies together:

   ng update @angular/core@20 @angular/cli@20

3. Update related tooling:

   • @angular-devkit/build-angular
   • @ngtools/webpack
   • TypeScript ESLint packages

4. Test thoroughly:

   • Run full test suite
   • Check for decorator-related issues
   • Verify build configuration

---

✅ Recommendation

❌ DO NOT AUTO-MERGE
🛑 REQUIRES MANUAL INTERVENTION

Recommended Actions:

1. Close this PR - The version jump is incompatible with your current Angular version

2. Choose one of these paths:

   Option A: Stay on Angular 15 (Recommended for stability)

   • Keep TypeScript 4.9.x (latest: 4.9.5)
   • Update to TypeScript ~4.9.5 (you're already on this)
   • Close this Dependabot PR

   Option B: Upgrade to modern stack (Recommended for long-term)

   • Plan Angular upgrade to v20+ (latest LTS)
   • This enables TypeScript 5.9 support
   • Requires significant testing and validation
   • Follow Angular's official update guide

3. Configure Dependabot to avoid this issue:
   Add to .github/dependabot.yml:

   version: 2
   updates:
     - package-ecosystem: "npm"
       directory: "/"
       target-branch: "main"
       ignore:
         - dependency-name: "typescript"
           update-types: ["version-update:semver-major"]

---

🔗 References

• Angular Version Compatibility
• TypeScript 5.0 Breaking Changes
• TypeScript 5.9 Release Notes

---

Analysis Generated:
Compatibility Score: 0 (Incompatible)
Security Risk: None
Breaking Change Risk: Critical