quanru / webpack-ast-demo

Getting Started

Related Issue & MR

• AST was illegal after webpack process
• fix: avoid modify ast params object reference

Demo Description

We say a entry file src/index.js, when bundle with webpack, there are two version ast:

• ast/ast-1.json is a ast snapshot in https://github.com/webpack/webpack/blob/main/lib/javascript/JavascriptParser.js#L3465

• ast/ast-2.json is a ast snapshot in https://github.com/webpack/webpack/blob/v5.80.0/lib/javascript/JavascriptParser.js#L3475

the ast-1.json is legal, but ast-2.json is illegal(can't not be traversed by acorn-walk and can't not restore to source code)

diff ast-1.json and ast-2.json