Ivan Hofer

Svelte ♥ TypeScript and so will you

The Svelte Context API can be error-prone. Discover a powerful pattern using object references as keys to make it completely type-safe.

Svelte ♥ TypeScript and so will you
#1about 3 minutes

The benefits of using TypeScript with Svelte

TypeScript provides essential static type checking for long-running Svelte projects, improving maintainability and collaboration among developers.

#2about 3 minutes

Setting up a SvelteKit project with TypeScript

Initialize a new SvelteKit application with TypeScript support and review the key configuration files like tsconfig.json and svelte.config.js.

#3about 3 minutes

Defining and using typed component props

Add the `lang="ts"` attribute to script tags and define typed props to get auto-completion and error checking when using components.

#4about 2 minutes

Running project-wide type checks with svelte-check

Use the `svelte-check` command in watch mode or in a CI/CD pipeline to perform static type analysis across your entire Svelte project.

#5about 2 minutes

Handling optional props and discriminated unions

Make component props optional by assigning a default value and safely handle complex data structures like discriminated unions in your templates.

#6about 3 minutes

Creating generic components with `$$Generic`

Use the special `$$Generic` type to create reusable Svelte components that can work with multiple data types while maintaining full type safety.

#7about 4 minutes

Typing passthrough props with `$$restProps` and `$$Props`

Build wrapper components like custom buttons that accept standard HTML attributes with full type safety by using `$$restProps` and `$$Props`.

#8about 3 minutes

Implementing a type-safe Svelte context

Overcome the limitations of Svelte's default context API by creating a typed wrapper that eliminates the need for string keys and provides type inference.

#9about 2 minutes

Type-safe routing and endpoints in SvelteKit

Leverage SvelteKit's auto-generated types for file-based routes to create type-safe API endpoints with validated dynamic URL parameters.

#10about 2 minutes

Resources for learning Svelte with TypeScript

Find additional learning resources, including a dedicated GitHub repository with examples, to continue exploring Svelte and TypeScript integration.

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