1. Documentation
  2. Learn
  3. Playground
  4. Blog
  1. Introduction
    1. What is Lit?
    2. Getting Started
  2. Components
    1. Overview
    2. Defining
    3. Rendering
    4. Reactive properties
    5. Styles
    6. Lifecycle
    7. Shadow DOM
    8. Events
    9. Decorators
  3. Templates
    1. Overview
    2. Expressions
    3. Conditionals
    4. Lists
    5. Built-in directives
    6. Custom directives
  4. Composition
    1. Overview
    2. Component composition
    3. Mixins
    4. Controllers
  5. Managing Data
    1. Context
    2. Async Tasks
    3. Signals
  6. Tools and workflows
    1. Overview
    2. Requirements
    3. Development
    4. Testing
    5. Publishing
    6. Production
    7. Starter kits
    8. Adding Lit
  7. Server rendering
    1. Overview
    2. Server usage
    3. Client usage
    4. Authoring components
    5. DOM emulation
  8. Frameworks
    1. React
  9. Localization
    1. Overview
    2. Runtime mode
    3. Transform mode
    4. CLI and config
    5. Best practices
  10. API
    1. LitElement
    2. ReactiveElement
    3. Templates
    4. Styles
    5. Decorators
    6. Directives
    7. Custom directives
    8. Static HTML
    9. Controllers
    10. Misc
  11. Releases
    1. Lit 3 upgrade guide
  12. Related libraries
    1. Standalone lit-html
    2. Lit Labs
  13. Resources
    1. Community
  1. Documentation
  2. Learn
  3. Playground
  4. Blog
  1. ›Introduction
    1. What is Lit?
    2. Getting Started
  2. ›Components
    1. Overview
    2. Defining
    3. Rendering
    4. Reactive properties
    5. Styles
    6. Lifecycle
    7. Shadow DOM
    8. Events
    9. Decorators
  3. ›Templates
    1. Overview
    2. Expressions
    3. Conditionals
    4. Lists
    5. Built-in directives
    6. Custom directives
  4. ›Composition
    1. Overview
    2. Component composition
    3. Mixins
    4. Controllers
  5. ›Managing Data
    1. Context
    2. Async Tasks
    3. Signals labs
  6. ›Tools and workflows
    1. Overview
    2. Requirements
    3. Development
    4. Testing
    5. Publishing
    6. Production
    7. Starter kits
    8. Adding Lit
  7. ›Server rendering labs
    1. Overview
    2. Server usage
    3. Client usage
    4. Authoring components
    5. DOM emulation
  8. ›Frameworks
    1. React
  9. ›Localization
    1. Overview
    2. Runtime mode
    3. Transform mode
    4. CLI and config
    5. Best practices
  10. ›API
    1. LitElement
    2. ReactiveElement
    3. Templates
    4. Styles
    5. Decorators
    6. Directives
    7. Custom directives
    8. Static HTML
    9. Controllers
    10. Misc
  11. ›Releases
    1. Lit 3 upgrade guide
  12. ›Related libraries
    1. Standalone lit-html
    2. Lit Labs labs
  13. ›Resources
    1. Community

Contents: Lit 3 upgrade guide

  1. Overview
  2. Lit is now published as ES2021
    1. Using Lit 3 with Webpack 4
  3. Updates to Lit decorators
  4. List of removed APIs
  5. Steps to upgrade
    1. Removed UpdatingElement alias for ReactiveElement
    2. Removed re-export of decorators from lit-element
    3. Deprecated queryAssignedNodes(slot: string, flatten: bool, selector: string) decorator signature removed
    4. Server side rendering experimental hydration modules removed from lit, lit-element, and lit-html
  6. [Type only]: Type of renderRoot and createRenderRoot() have been updated
  7. Optional: Upgrade to standard decorators
    1. Configuration
    2. Code changes

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