Source: https://seerepo.com/r/stenciljs/core/built
Markdown source: https://seerepo.com/r/stenciljs/core/built.md
Description: core is a TypeScript repo. It makes its content with parse5 and pixelmatch and is tested with Puppeteer and Jest.

# What is core built with?

core is a TypeScript repo. It makes its content with parse5 and pixelmatch and is tested with Puppeteer and Jest. It has 180,037 written lines, with 1,020 test files.

Read on November 10, 2026, at commit bb880de.

Repository: https://github.com/stenciljs/core

## Frontend (/)

### Styles

- **[PostCSS](https://seerepo.com/uses/postcss)**: 3 files
- **[Autoprefixer](https://seerepo.com/uses/autoprefixer)**: 1 file
- **css-what**: 1 file
- **postcss-safe-parser**: 1 file
- **[postcss-selector-parser](https://seerepo.com/uses/postcss-selector-parser)**: 1 file

### Interface

- **[prompts](https://seerepo.com/uses/prompts)**: 2 files

## Support (/)

### Content

- **[parse5](https://seerepo.com/uses/parse5)**: 1 file
- **[pixelmatch](https://seerepo.com/uses/pixelmatch)**: 1 file

### Testing

- **Puppeteer**: 9 files
- **Jest**: 1 file

### Tools

- **TypeScript**: 101 files
- **rollup**: 28 files
- **magic-string**: 5 files
- **glob**: 2 files
- **terser**: 2 files
- **@yarnpkg/lockfile**: 1 file
- **Ionic**: 1 file
- **merge-source-map**: 1 file
- **Prettier**: 1 file

### Other

- **graceful-fs**: 9 files
- **SemVer**: 4 files
- **minimatch**: 2 files
- **ansi-colors**: 1 file
- **node-fetch**: 1 file
- **open**: 1 file
- **ws**: 1 file

## Support (src/testing/jest/jest-27-and-under)

### Testing

- **Jest**: 1 file

## Support (src/testing/jest/jest-28)

### Testing

- **Jest**: 1 file

## Support (src/testing/jest/jest-29)

### Testing

- **Jest**: 1 file

## Other repos with a similar stack

- [HumanSignal/label-studio](https://seerepo.com/r/HumanSignal/label-studio/built): PostCSS, Autoprefixer, postcss-selector-parser, pixelmatch · [Compare](https://seerepo.com/compare/HumanSignal/label-studio/vs/stenciljs/core)
- [shadcn-ui/ui](https://seerepo.com/r/shadcn-ui/ui/built): PostCSS, postcss-selector-parser, prompts · [Compare](https://seerepo.com/compare/shadcn-ui/ui/vs/stenciljs/core)
- [gatsbyjs/gatsby](https://seerepo.com/r/gatsbyjs/gatsby/built): PostCSS, Autoprefixer, prompts · [Compare](https://seerepo.com/compare/gatsbyjs/gatsby/vs/stenciljs/core)
- [nrwl/nx](https://seerepo.com/r/nrwl/nx/built): PostCSS, Autoprefixer, parse5 · [Compare](https://seerepo.com/compare/nrwl/nx/vs/stenciljs/core)
- [ampproject/amphtml](https://seerepo.com/r/ampproject/amphtml/built): PostCSS, Autoprefixer, css-what · [Compare](https://seerepo.com/compare/ampproject/amphtml/vs/stenciljs/core)
- [vercel/next.js](https://seerepo.com/r/vercel/next.js/built): PostCSS, prompts

## Frequently asked questions

### What language is core written in?

core is written in TypeScript, with 180,037 written lines.

### Does core have tests?

Yes. core has 1,020 test files and is tested with Puppeteer and Jest.

### Which repos have a stack like core's?

The ones that share most of its stack: HumanSignal/label-studio, shadcn-ui/ui, and gatsbyjs/gatsby.

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.