recast
JavaScript syntax tree transformer, nondestructive pretty-printer, and automatic source map generator (by benjamn)
espree
An Esprima-compatible JavaScript parser (by eslint)
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recast | espree | |
---|---|---|
6 | 5 | |
4,825 | 2,242 | |
- | 1.1% | |
5.8 | 6.2 | |
28 days ago | 6 days ago | |
TypeScript | JavaScript | |
MIT License | BSD 2-clause "Simplified" License |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
recast
Posts with mentions or reviews of recast.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2024-04-05.
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What is an Abstract Syntax Tree in Programming?
GitHub | Website
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[AskJS] Any good shortcuts for migrating off of enzyme?
If jscodeshift is confusing, I recommend looking into using recast directly, along with ast-types for AST traversal and its node factories. Inside your visitors, write some conditionals that check for the patterns you want to detect, then mutate the node passed to the visitor, or otherwise mutate the AST. Keep going until tests are passing.
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Evan you on Svelte migration from Vue
I ended up writing my own codemod tool based on recast to automate most of the repetitive, mindless grunt work. Even with the tool shaving hundreds of hours off of the migration effort, there's still a huge amount of work left, since we need to find or create Vue 3-compatible alternatives of all of our Vue 2-only dependencies. Some of these dependencies (e.g. vee-validate) are used pretty ubiquitously too
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Which library to use for AST manipulation?
I had great results with a combination of babel + recast. Babel is doing the job and Recast is mostly here to preserve the original style when printing code again. I animated a workshop @ Node.JS Montréal 2019 that was recorded here. We cover the parse/transform/print of code using Babel (live coding starts around 45').
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JARVIS – Write me a Codemod
recast
- Show HN: Monocle – bidirectional code generation library
espree
Posts with mentions or reviews of espree.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-11-07.
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ESLint: under the hood
Focusing again on ESLint, the parser used by the linter is called Espree. This is an in-house parser built by the ESLint folks to fully support ECMAScript 6 and JSX on top of the already existing Esprima. The Espree module provide APIs for both tokenization and parsing that you can easily test out.
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Abstract Syntax Trees and Practical Applications in JavaScript
Why do we then have other JavaScript parsers like babel parser, swc parser, acorn, espree and the likes since JavaScript engines have their own internal parsers?
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Quick start with ESLint
How does ESLint work? ESLint uses Espree for Javascript parsing. It uses an AST to evaluate patterns in code. It does all this before runtime.. meaning, without running your Javascript code it will find the bugs, syntax and stylistic errors.
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Gentle Introduction To ESLint Rules
ESLint doesn't process the code into the compiler phases, rather it provides an option to let you specify a Parser. By default, ESLint uses Espree which essentially converts JS source code to AST data structure, so in case you want to write a rule targeting TypeScript source code, you'll need to specify a different parser in your .eslintrc.json configuration file, same applies for different file extension, for HTML you might use this or creating your own parser!
- Show HN: Monocle – bidirectional code generation library
What are some alternatives?
When comparing recast and espree you can also consider the following projects:
escodegen - ECMAScript code generator
Acorn - A small, fast, JavaScript-based JavaScript parser
Babel (Formerly 6to5) - 🐠 Babel is a compiler for writing next generation JavaScript.
jscodeshift - A JavaScript codemod toolkit.
ast-node-finder - AST Node Find api automatically generated from code
estree - The ESTree Spec
ts-lite - Compiled TypeScript. Generates Go, Swift, Kotlin, WASM, Binary
babel-plugin-handbook - How to create Babel plugins
openapi-preprocessor - An authoring tool for OpenAPI specifications
esprima - ECMAScript parsing infrastructure for multipurpose analysis