escodegen
ECMAScript code generator (by estools)
espree
An Esprima-compatible JavaScript parser (by eslint)
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escodegen | espree | |
---|---|---|
3 | 5 | |
2,620 | 2,242 | |
0.2% | 1.0% | |
1.2 | 6.2 | |
25 days ago | 2 days ago | |
JavaScript | JavaScript | |
BSD 2-clause "Simplified" 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.
escodegen
Posts with mentions or reviews of escodegen.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2022-05-07.
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How to make your own programming language in JavaScript
What's cool about Esprima syntax is that there are tools that generate code based on their AST. An example is escodegen which takes Esprima AST as input and outputs JavaScript code. You can think that you can use just strings to generate code, but this solution will not scale. In this tutorial, I show only a single if statement but you will run into a lot of problems if you will have more complex code.
- Show HN: Monocle – bidirectional code generation library
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Abstract Syntax Trees: They're Actually Used Everywhere -- But What Are They?
Unparse the modified AST back into Javascript: Escodegen
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 escodegen and espree you can also consider the following projects:
recast - JavaScript syntax tree transformer, nondestructive pretty-printer, and automatic source map generator
esprima - ECMAScript parsing infrastructure for multipurpose analysis
Babel (Formerly 6to5) - 🐠 Babel is a compiler for writing next generation JavaScript.
astring - 🌳 Tiny and fast JavaScript code generator from an ESTree-compliant AST.
Acorn - A small, fast, JavaScript-based JavaScript parser
estree - The ESTree Spec
estraverse - ECMAScript JS AST traversal functions
babel-plugin-handbook - How to create Babel plugins
jquery.terminal - jQuery Terminal Emulator - JavaScript library for creating web-based terminals with custom commands