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A brief introduction to various JavaScript parsers

author : sea

Various js Parser is the cornerstone of front-end engineering , It can be said that without it , A lot of Engineering doesn't work properly , We use it every day babel、webpack、eslint、TypeScript We all need a set of corresponding js Parser , Today we'll look at it , What parsers are commonly used in the market at present , What characteristics do they have ?

Preface

Say js Before parser , We need to know something about ESTree This project , The original intention of this project is through the power of the community , Guarantee and es Consistency of specifications , To express through a custom grammatical structure JavaScript Of AST, Later, with the increasing popularity , With the participation of many well-known Engineers , It has become a de facto norm , The current library is Mozilla Maintained with the community .

without AST standard , That means that you can't create a parser at all , And if the AST Disunity of norms , Some of the corresponding tool libraries can't communicate with each other well , such as webpack It can't be used normally babel Related to the plug-in .

Precisely because EsTree The specification of the definition of , So now all the js Parser or compiler , It's basically impossible to get around it , If you want to write one yourself js Parser , Then you must read the document again .

One . Well-known JS Parser

1.1 uglify-js (11.2k*)

Creation time :2010-8-1
Work address :https://github.com/mishoo/UglifyJS
The authors introduce :Mihai Bazon,Lisp The programmer ,Emacs lovers , It looks like Romanian
The author blog :

**
Used to obfuscate and compress code , For some reason ,uglify-js own [ Internally, a set of AST standard [1]](http://lisperator.net/blog/ug..., It's because of its AST It's self-made , It's not standard ESTree,es6 After the new grammar AST, Don't support , So there's no way to compress the latest es6 Code for , If you need to compress , Similar to babel This tool is converted into ES5.

uglify-js It's been done to 3 Version of the , The first two versions are Mihai Bazon maintain , But now the latest 3 The version is alexlamsluglify-js It's been done to 3 Version of the , The first two versions are

uglify-js Can pass --acorn perhaps --spidermonkey Specify corresponding parsing

1.2 Esprima (6k*)

Creation time :2011-11-20
Work address :https://github.com/jquery/esprima
The authors introduce :ariya Indonesians , Got a doctorate in Germany , Currently living in Silicon Valley mountain view , Created the world's first truly headless Web browser PhantomJS. Also for the WebKit, KDE, and Qt Contributed a lot of code
The author blog :

This is a The first one uses JavaScript Written in line with EsTree canonical JavaScript The parser , Many subsequent compilers are affected by it , I think its emergence has historical significance .

1.3 acorn (6.8k*)

Creation time :2012-9-23
Work address :https://github.com/acornjs/acorn
The authors introduce :Marijn Haverbeke, It's also a rich text editor prosemirror(4.8k)、 Browser code editor CodeMirror(21.7k) The author of , He also published a Book 《Eloquent JavaScript》, And this book is also available online https://eloquentjavascript.net/, At present, the book has been translated in China , But only the second edition 《JavaScript Programming insight 》, There are also people who currently live in Berlin, Germany .
The author blog :

acorn and Esprima Is very similar , Output ast It's all in line with EsTree canonical , at present webpack Of AST The parser uses acorn, and Esprima equally , It also doesn't directly support JSX

It should be mentioned that ,[acorn Of es6 Grammar support RReverser Contributed more than half of [2]](https://rreverser.com/added-e...

1.4 @babel/parser(babylon)

Creation time :2012-9-23
Work address :https://github.com/babel/babel/tree/master/packages/babel-parser

babel Official parser , first fork On acorn, Later, he completely went his own way , from babylon After the change of name , The plug-in system it builds is very powerful .

1.5 espree (1.3k*)

Creation time :2014-11-30
Work address :https://github.com/eslint/espree
author :Nicholas C. Zakas, Multiple copies js Books , among 《 Red Treasure Book The third edition 》 Most famous ,eslint He also created , stay 2016 He was diagnosed with Lyme disease in , I haven't worked for a long time now , If you're interested , You can go to github It donated him , Donation page links .
The author blog :

eslint、prettier Default parser for , first fork On Esprima A branch of (v1.2.2), Later, because ES6 Rapid development of , but Esprima I don't support it for a short time , It's based on acorn Developed .

1.5 TypeScript

Creation time :2014-7-6
Work address :https://github.com/microsoft/TypeScript/tree/master/src/compiler
author : This is microsoft Of Anders Hejlsberg Leaders created , He is also C#、Delphi、Turbo Pascal The author of

Now there are a lot of big projects , The first choice is TypeScript, Its parser is in the project src/compiler/parser.ts,TypeScript There's one big difference from other projects , It's about

The above Library , It's all based on js To write it , There are also libraries , There are also some special js Parser , If you need to know something about

Two . Other interesting parsers

2.1 sucrase (2.9k*)

Creation time :2017-9-24
Work address :https://github.com/alangpierce/sucrase
author :Alan Pierce, Inauguration benchling, This is a company that specializes in software collaboration for life scientists .
The author blog :

This is a @babel/parser A subset of , If you're sure the code doesn't need to be compatible IE browser , You can use this parser , According to his introduction , Its parsing speed should be the fastest at present .

2.2 swc (10.1k*)

Creation time :2017-12-17
Work address :https://github.com/swc-project/swc
author :강동윤, He is a 97 Xiaomengxin in , I'm still a sophomore ,rust A big fan of , Open source a lot rust Related items , So this year 8 month Deno The official gave him a consultancy contract .
The author blog :

With rust Compiling js compiler , Single core ratio babel fast 4 times ,4 Nuclear ratio babel fast 70 times , It can also be used to pack js、ts Code , And also have tree shaking function , Its default configuration file spack.config.js and webpack.config.js bring into correspondence with ,@swc/cli Intentionally and @babel/cli Want to share , It seems ambitious .

Its goal is to replace babel, Now it's done babel Most of the functions ,[ See the comparison table for details [3]](https://swc.rs/docs/compariso...

2.3 esbuild (16.5k*)

Creation time :2020-1-1
Work address :https://github.com/evanw/esbuild/
author :Evan Wallace, Have been engaged in webGL Aspect related development , Currently working in Figma
Personal blog :

esbuild Yes, it is go The next generation of Writers web Packaging tools , It has the fastest packaging and compression records available ,snowpack and vite It's also used as a packaging tool , In pursuit of outstanding performance , At present, there is no plan to AST Exposure , It can't be modified AST, Cannot be used to resolve the corresponding JavaScript.

At present, its star The fastest growing of all projects .

3、 ... and . Other well-known toolkits

3.1 recast (3.4k*)

Creation time :2012-9-16
Work address :https://github.com/benjamn/recast
author :Ben Newman,recast author ,TC39 member , Currently living in the Brooklyn area of New York
Personal blog :

If you need to refactor your code , So this library will be your first choice , It can use multiple parsers at the same time , And you can customize the parser you need to pass in , It's a good tool for reconstruction .

3.2 jscodeshift (5.9k*)

Creation time :2015-3-22
Work address :https://github.com/facebook/jscodeshift
author :Felix Kling.
Personal blog :

jscodeshift The bottom layer depends on recast, On the basis of it, we encapsulate traversal 、 operation AST Methods , Make it more convenient , If you need to do it directly AST To build new features , I think this is the most appropriate choice .

For the moment fkling Has left Facebook, At present, the main maintainer of this library is no longer him

3.2 ASTExplorer (3.6k*)

Creation time :2014-6-29
Work address :https://github.com/fkling/astexplorer
author :Felix Kling

If you need to refactor or refactor the code AST Analysis of , that https://astexplorer.net/ This website should be able to help you , It's a visual AST Browsing tools , excellent .

Not yet SWC, But someone has already mentioned the corresponding pr, Not yet merged

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