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Developer tools · #babel
Stop bloating your bundles and polluting the global scope. Learn how to use core-js/pure to implement tree-shakable polyfills for modern JavaScript environments.
Learn how Babel’s useBuiltIns: 'usage' option adds only the polyfills your code actually uses, reducing bundle size while maintaining compatibility.
When Babel skips class property syntax, the runtime crashes. This guide walks through the most common configuration gaps, step‑by‑step checks, fixes, and escalation criteria to get your build back on track.
Stop duplicating helper functions in your JS bundles. Learn how @babel/plugin-transform-runtime reduces bundle size and prevents global namespace pollution for libraries.
Learn how to architect custom Babel plugins using the visitor pattern and AST paths to avoid infinite loops and tree corruption during JavaScript transformations.
What is a reliable, step‑by‑step process for taking a JavaScript project that uses Babel for transpilation and deploying it to a production environment? I need a clear workflow that covers installing Babel, configuring presets and plugins, compiling the code, and finally deploying the compiled output (e.g., to a CDN or a Node.js server). The question should
I want to upgrade Babel to take advantage of newer JavaScript features, but I need a reliable process to test the upgrade and revert to the previous version if something goes wrong. What steps should I follow to pin versions, run tests, and safely roll back?
When using babel-loader with the cacheDirectory option enabled, the loader creates a cache entry based on a hash of the source file’s content and the resolved Babel configuration. If the Babel configuration (e.g., plugin options or presets) changes while the source file’s content and modification time remain unchanged, the existing cache entry may be reused,
Babel operates on a pipeline that converts source code into an Abstract Syntax Tree (AST) via the parser and subsequently converts that AST back into code using the generator. While the AST captures the semantic structure of the JavaScript, the process of transpilation is inherently lossy regarding original source formatting. When complex AST transformations
webpack
corejs
javascript