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Angular Migration Guide

This guide walks you through upgrading your Angular application using DepFixer.

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Supported Migrations

Current VersionTarget Versions
Angular 1215, 16, 17, 18, 19
Angular 1316, 17, 18, 19
Angular 1417, 18, 19
Angular 1518, 19
Angular 1618, 19
Angular 1718, 19
Angular 1819
DepFixer supports multi-version jumps. You can go directly from Angular 12 to Angular 18.

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Before You Start

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1. Check Current State

npx depfixer
Fix any existing issues before migrating. A clean health score makes migration smoother.

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2. Commit Current Changes

git add -A
git commit -m "chore: pre-migration checkpoint"

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Migration Steps

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Step 1: Run Migration Command

npx depfixer migrate

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Step 2: Select Target Version

Use arrow keys to navigate and Enter to select: 
Select target version:

    Angular 19 (Latest)
      -> 19.0.0 - Latest stable

  > Angular 18 (LTS)
      -> 18.2.0 - Long-term support

    Angular 17
      -> 17.3.0 - Stable

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Step 3: Review and Apply

After payment, the migration is applied: 
✨ SUCCESS
──────────────────────────────────────────────────

    ✓ 12 Packages Updated
    ✓ Backup: package.json.bak

    👉 NEXT STEP:
    Run the following command to finalize changes:

    $ npm install

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Post-Migration Steps

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1. Install Dependencies

npm install

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2. Run Angular Schematics (Optional)

Some migrations require code changes: 
ng update @angular/core @angular/cli

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3. Fix Any Remaining Issues

npx depfixer
ng build

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TypeScript Versions

AngularTypeScript
195.5 - 5.6
185.4 - 5.5
175.2 - 5.4
164.9 - 5.1
154.8 - 4.9

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Version-Specific Changes

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Angular 16 → 17

  • Standalone by default - Components are standalone unless specified
  • New control flow - @if, @for, @switch syntax
  • Deferred loading - @defer for lazy loading

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Angular 17 → 18

  • Zoneless support - Experimental zoneless change detection
  • Signal-based inputs - input() function for reactive inputs
  • New build system - application builder with esbuild

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Angular 18 → 19

  • Incremental hydration - Partial hydration for SSR
  • Resource API - Reactive data fetching primitives
  • linkedSignal - Derived signals with reset capability

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Rollback

If migration fails, restore from backup: 
# Restore package.json
copy package.json.bak package.json  # Windows
cp package.json.bak package.json    # macOS/Linux

# Reinstall original dependencies
npm install