js-ast

This is a monorepo with packages to boost the DX of working with AST (using JavaScript programming language) related to:

• JavaScript
• TypeScript
• Svelte

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Core goals

1. DX friendly.
2. Cross-runtime friendly—👈 this also means ESM only.
3. e18e friendly.
4. No build step—meaning you can debug/edit source code inside node_modules as it is.
5. Extensive tests.

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Packages

In order to work with AST, the following processes are recognized:

1. Building programmatically the AST node(s), or an entire object.
2. Parsing stringified code syntax into AST object.
3. Traversing the AST object.
4. Printing the AST object back into stringified code syntax.

Important

The following lists of packages contains what you can combine together - based on shared AST node interface format - aligned with ESTree specification.

Note

Not all of these packages are part of this monorepo.

Build

Sometimes you need to do some code transformation...

Name	Languages	In this repository?
js-ast-build		✅
ts-ast-build		✅
svelte-ast-build		✅

Parse

Getting the AST object from stringified code syntax.

Name	Languages	In this repository?
@swc/core		❌
svelte/compiler		❌

Traverse

In other words, walk on the AST object.

Name	Languages	In this repository?
zimmerframe		❌

Print

Print the AST object or nodes into stringified code syntax.

Name	Languages	In this repository?
esrap		❌
svelte-ast-print		✅

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Contributing

If you can offer your time - refer to Contribution Guide.

Otherwise, consider sponsoring me.

Author

Mateusz "xeho91" Kadlubowski