esprima
babel-handbook
esprima | babel-handbook | |
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8 | 7 | |
6,962 | 11,932 | |
0.0% | - | |
0.0 | 0.0 | |
about 1 year ago | 2 months ago | |
TypeScript | ||
BSD 2-clause "Simplified" License | Creative Commons Attribution 4.0 |
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esprima
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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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Why you don’t need TypeScript
For TypeScript we have used AST transforms from their compiler API, and for plain JavaScript we did a similar thing using ESPrima. This helped us implement some simple optimizations like stream fusion (combining .filter and .map into a single operation) or avoiding extra object allocations in vector math, which led to nice performance improvements in code that does heavy computation (we process large amounts of data on the server and store results of physics simulations).
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Algorithm to simplify a 100-variable Boolean expression?
I used ESPrima, but any parser would do in this case. I then wrote a simple function to extract all "atomic" non-boolean expressions from it.
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How to make your own programming language in JavaScript
AST is an acronym for Abstract Syntax Tree. It's the way to represent code in a format that tools can understand. Usually in form of tree data structure. We will use AST in the format of an Esprima, which is a JavaScript parser that outputs AST.
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What the heck is an Abstract Syntax Tree (AST) ?
esprima
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Abstract Syntax Trees: They're Actually Used Everywhere -- But What Are They?
Create an AST: Esprima
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We Switched from Webpack to Vite
The thread was originally about CRA vs Vite size on disk (or implicitly, if we're applying it to real world applications, network cost in CI job startup times). And like I said, surrogate pairs don't apply to ASCII.
See this[0] for reference. Note how the first byte must fall within a certain range in order to signal being a surrogate pair. This fact is taken advantage of by JS parsers to make parsing of ASCII code faster by special casing that range, since checking for a valid character in the entire unicode range is quite a bit more expensive[1].
[0] https://github.com/jquery/esprima/blob/0911ad869928fd218371b...
[1] https://github.com/jquery/esprima/blob/0911ad869928fd218371b...
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How to create your own language that compile to JavaScript
If you want to learn more about parsing, reading the code of an actual recursive parser might be a better idea. Esprima is a decent place to start if you're interested in JS grammar. Then you can look at the babel handbook to learn more about AST transformations. From there, the literature gets quite a bit more heavy. If you get this far and are willing to push further, you'll probably want to grab yourself a copy of the dragon book at a minimum.
babel-handbook
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Abstract Syntax Trees and Practical Applications in JavaScript
For more information about building Babel plugins, check the Kent's Babel Handbook or this awesome Babel handbook by Jamie.
- babel-handbook: A guided handbook on how to use Babel and how to create plugins for Babel.
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Getting Started With Babel - Transpiling Javascript
Babel does this by compiling down JavaScript code written with the latest standards into a version that will work everywhere today. This process is known as source-to-source compiling, also known as transpiring. Source: Jamie Kyle
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11 JavaScript Examples to Source Code That Reveal Design Patterns In Use
I'll be honest, my approach to getting used to working with ASTs is a bit weird, but it worked for me. For some reason the thought of working with the TypeScript AST sounds really attractive to me. I'm sure most people recommend to start deep diving into babel first before getting used to working with an AST with the TypeScript compiler, but I started it the other way around. There is a great library called ts-morph that focuses on making it easier for developers to work with the TypeScript compiler. Learning hands on with ts-morph while getting used to their compiler api made babel much easier to understand without ever touching babel.
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A tale of knowledge building
Those videos gave me a base for the task but I needed more sources to achieve it, so I read a lot of source code for other libraries built with babel-plugin-macros, read the plugin's authoring documentation and Jamie Kyle's Babel Handbook.
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How to create your own language that compile to JavaScript
If you want to learn more about parsing, reading the code of an actual recursive parser might be a better idea. Esprima is a decent place to start if you're interested in JS grammar. Then you can look at the babel handbook to learn more about AST transformations. From there, the literature gets quite a bit more heavy. If you get this far and are willing to push further, you'll probably want to grab yourself a copy of the dragon book at a minimum.
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Revealing the magic of AST by writing babel plugins
Babel handbook
What are some alternatives?
estree - The ESTree Spec
super-expressive - 🦜 Super Expressive is a zero-dependency JavaScript library for building regular expressions in (almost) natural language
estraverse - ECMAScript JS AST traversal functions
esbuild-loader - Webpack loader for esbuild: Speed up your build ⚡️
babel-plugin-macros - 🎣 Allows you to build simple compile-time libraries
escodegen - ECMAScript code generator
super-expressive.macro - 🎣 A macro to generate Regular Expressions (RegExp) at build-time with super-expressive.
vite-plugin-vue2 - Vue2 plugin for Vite
picoc - A very small C interpreter
Visual Studio Code - Visual Studio Code
cheerio - The fast, flexible, and elegant library for parsing and manipulating HTML and XML.