Abstract Syntax Trees: They're Actually Used Everywhere -- But What Are They?

• estraverse

  2 921 0.0 JavaScript

  ECMAScript JS AST traversal functions

  

Traverse that AST and replace or inject code: Extraverse

• esprima

  8 6,962 0.0 TypeScript

  ECMAScript parsing infrastructure for multipurpose analysis

  

Create an AST: Esprima

• SurveyJS

  surveyjs.io featured

  Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

  

• escodegen

  3 2,620 1.2 JavaScript

  ECMAScript code generator

  

Unparse the modified AST back into Javascript: Escodegen

• Visual Studio Code

  2,844 158,365 10.0 TypeScript

  Visual Studio Code

  

Isn't it wonderful how VS Code grays out obsolete lines of code? Oops, my return statement is on line 3. Line 4 won't run... But I haven't called the function yet. So how in the world does VS Code know which lines of code won't be used in the future, when the code finally does run?

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