使用代码修改重构桶文件

发布于 2024-11-12

Barrel File in JavaScript: It's a module that combines and re-exports multiple exports from other files into one entry point, enabling importing multiple items from a single file instead of separately. It's often seen via an index.js in a directory with multiple files.
Advantages and Disadvantages: Convenient but can impact build performance, tree-shaking, and developer tooling.
Killing Huge Barrel Files: In a big codebase, the goal was to stop referencing barrel files by changing imports. Manual or smart search & replace was not feasible due to multiple import paths and edge cases.
Using Codemod: Decided to build a codemod instead. Leveraged AI (Claude 3.5 Sonnet) as prior experience was limited. The codemod is designed to work with [jscodeshift] to modify TypeScript/JavaScript files.
Codemod Details:
- Defines BARREL_IMPORTS and DROP_LAST_SEGMENT_PATHS lists.
- Uses functions like getCompilerOptions, resolveModule, and buildExportMap to handle module resolution and build an export map.
- The transform function iterates through ImportDeclaration nodes, finds matching barrel files, and replaces them with new imports based on the export map and other conditions.
- If modified, logs a message and returns the modified source code; otherwise, returns null.

阅读 16