# Svelte

> JavaScript framework

**Wikidata**: [Q16863097](https://www.wikidata.org/wiki/Q16863097)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Svelte)  
**Source**: https://4ort.xyz/entity/svelte

## Summary
Svelte is a JavaScript framework and compiler that converts components into optimized vanilla JavaScript at build time, eliminating runtime overhead. First released on November 26, 2016, it emphasizes simplicity and performance by shifting work to the compiler rather than the browser. It is designed to simplify web development while producing highly efficient code.

## Key Facts
- **Initial Release**: November 26, 2016.
- **Developers**: Created by Rich Harris, with contributions from Alan Faubert, Simon Holthausen, Dominic Gannaway, Tan Li Hau, Ben McCann, and Paolo Ricciuti.
- **License**: MIT License.
- **Latest Version (as of 2018)**: 2.11.0 (released August 15, 2018).
- **Repository**: Hosted on GitHub at [sveltejs/svelte](https://github.com/sveltejs/svelte).
- **Programming Languages**: Works with JavaScript, HTML, and CSS.
- **Package Manager**: Available via npm as `svelte`.
- **Community**: Official subreddit (`r/sveltejs`) and YouTube channel (65,910 subscribers as of 2023).

## FAQs
### Q: What makes Svelte different from other JavaScript frameworks like React or Angular?
A: Svelte compiles components into optimized vanilla JavaScript at build time, avoiding runtime overhead and virtual DOM diffing. This results in smaller bundle sizes and faster execution.

### Q: Who created Svelte?
A: Svelte was created by Rich Harris and is maintained by a team of contributors, including Alan Faubert, Simon Holthausen, and others.

### Q: Is Svelte open-source?
A: Yes, Svelte is released under the MIT License and is freely available on GitHub.

## Why It Matters
Svelte redefines frontend development by shifting complexity from the browser to the compiler. Unlike traditional frameworks that rely on virtual DOMs or runtime logic, Svelte generates minimal, optimized code that runs directly in the browser. This approach reduces bundle sizes, improves load times, and simplifies debugging. Its focus on simplicity and performance has resonated with developers, driving adoption in both small projects and enterprise environments. Svelte’s compiler-first philosophy challenges conventional framework design, influencing modern web development practices and inspiring new tools and workflows.

## Notable For
- **Compiler-First Approach**: Converts components into optimized vanilla JavaScript at build time, eliminating runtime framework overhead.
- **Small Bundle Sizes**: Produces minimal production code without dependencies on a runtime library.
- **Reactive Programming Model**: Automatically updates the DOM in response to state changes without manual event handling.
- **Open-Source MIT License**: Freely usable in commercial and personal projects with active community contributions.
- **Growing Ecosystem**: Supported by tools like the official REPL ([svelte.dev/repl](https://svelte.dev/repl)) and frameworks such as SvelteKit.

## Body

### Core Features
- **Compiler**: Svelte processes components during development, generating highly optimized JavaScript, CSS, and HTML. This compilation step hoists static computations, eliminates redundant code, and minimizes runtime logic.
- **Reactivity**: Uses a reactive programming model where the compiler automatically tracks dependencies and updates the DOM efficiently, without requiring a virtual DOM.
- **Language Support**: Integrates with JavaScript, HTML, and CSS, allowing developers to write declarative components in a single file.

### Versions
- **2.9.5–2.11.0**: Released between July 17, 2018, and August 15, 2018, these versions introduced incremental improvements to the compiler and runtime performance. For example, version 2.10.0 added support for nested transitions, while 2.11.0 improved error handling and component lifecycle methods.

### Ecosystem
- **Official Tools**: The [Svelte REPL](https://svelte.dev/repl) provides a live coding environment for prototyping components.
- **Community**: As of 2023, Svelte’s Twitter account (@sveltejs) has 65,910 followers, and its YouTube channel has 24,000 subscribers (as of 2025). The subreddit `r/sveltejs` fosters discussion and resource sharing.

### Technical Specifications
- **License**: MIT License (permissive open-source).
- **Repository**: Hosted on GitHub ([sveltejs/svelte](https://github.com/sveltejs/svelte)), with contributions from over 300 developers.
- **Cross-Platform**: Runs on any operating system capable of executing JavaScript (e.g., Windows, macOS, Linux).

### Adoption
- **Industry Use**: Svelte powers applications for companies like Vercel, Bloomberg, and Microsoft. Its small bundle sizes and performance benefits make it suitable for high-traffic and resource-constrained environments.
- **Educational Impact**: Svelte’s compiler-driven approach has been highlighted in technical blogs and conferences, such as Rich Harris’s 2019 talk “The Svelte Compiler” at JSConf.

## References

1. [Source](https://gist.github.com/Rich-Harris/0f910048478c2a6505d1c32185b61934)
2. [GitHub](https://github.com/sveltejs/svelte/graphs/contributors)
3. [2025](https://github.com/EvanLi/Github-Ranking/blob/master/Data/github-ranking-2025-07-06.csv)
4. [2023](https://github.com/sveltejs/svelte/pull/8569)
5. [Release 2.9.5. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.9.5)
6. [npmjs](https://registry.npmjs.com/svelte)
7. [Release 2.9.6. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.9.6)
8. [Release 2.9.7. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.9.7)
9. [Release 2.9.8. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.9.8)
10. [Release 2.9.9. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.9.9)
11. [Release 2.9.10. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.9.10)
12. [Release 2.9.11. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.9.11)
13. [Release 2.10.0. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.10.0)
14. [Release 2.10.1. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.10.1)
15. [Release 2.11.0. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.11.0)
16. [Release 2.12.0. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.12.0)
17. [Release 2.12.1. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.12.1)
18. [Release 2.13.0. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.13.0)
19. [Release 2.13.1. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.13.1)
20. [Release 2.13.2. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.13.2)
21. [Release 2.13.3. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.13.3)
22. [Release 2.13.4. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.13.4)
23. [Release 2.13.5. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.13.5)
24. [Release 2.14.0. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.14.0)
25. [Release 2.14.1. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.14.1)
26. [Release 2.14.2. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.14.2)
27. [Release 2.14.3. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.14.3)
28. [Release 2.15.0. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.15.0)
29. [Release 2.15.1. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.15.1)
30. [Release 2.15.2. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.15.2)
31. [Release 2.15.3. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.15.3)
32. [Release 2.15.4. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.15.4)
33. [Release 2.16.0. 2018](https://github.com/sveltejs/svelte/releases/tag/v2.16.0)
34. [Release 2.16.1. 2019](https://github.com/sveltejs/svelte/releases/tag/v2.16.1)
35. [Release 3.0.0. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.0.0)
36. [Release 3.0.1. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.0.1)
37. [Release 3.1.0. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.1.0)
38. [Release 3.2.0. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.2.0)
39. [Release 3.2.1. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.2.1)
40. [Release 3.2.2. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.2.2)
41. [Release 3.3.0. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.3.0)
42. [Release 3.4.0. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.4.0)
43. [Release 3.4.1. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.4.1)
44. [Release 3.4.2. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.4.2)
45. [Release 3.4.3. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.4.3)
46. [Release 3.4.4. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.4.4)
47. [Release 3.5.0. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.5.0)
48. [Release 3.5.1. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.5.1)
49. [Release 3.5.2. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.5.2)
50. [Release 3.5.3. 2019](https://github.com/sveltejs/svelte/releases/tag/v3.5.3)