Question 1

What does this polyfill and configuration tool actually do?

Accepted Answer

This application provides a visual interface for developers to determine which polyfills are necessary for their projects based on specific browser target requirements. By defining your target browsers—often using standard browserlist queries—you can understand the impact of your configurations before applying them to your production build pipeline.

It effectively maps specific browser versions against available core-js features, allowing for precise control over your bundle size. This ensures that you only include the polyfills your users actually need, reducing the overall size of your JavaScript assets.

Question 2

Can I use this to generate my Babel configuration file?

Accepted Answer

Yes, this tool is designed to help you construct the core-js and preset-env sections of your Babel configuration file accurately. Once you input your browser targets and desired core-js version, the tool generates a configuration object that you can copy and paste directly into your project's .babelrc or babel.config.js file.

By leveraging this tool, you remove the guesswork from configuring transpilation settings. It helps in maintaining a performant and compatible application, particularly when managing complex web projects that must support a variety of legacy and modern browser environments.

Question 3

Does this tool store my configuration data?

Accepted Answer

No, this is a completely stateless, client-side application. It does not use cookies, local storage, or server-side databases to save your configuration, browser queries, or code snippets. All data processing occurs entirely within your browser's memory for maximum security and privacy.

Because of this design, please ensure you copy your generated configuration to your local clipboard or save it into your project files before refreshing the page, as any input data will be cleared upon a page reload or tab closure.

Question 4

Is this tool compatible with all build systems?

Accepted Answer

The configurations generated by this tool are primarily targeted at developers using Babel with standard module bundlers like Webpack, Vite, or Rollup. The output is structured to be compliant with standard Babel preset-env specifications, making it highly portable across most modern JavaScript ecosystems.

While the tool aims for broad compatibility, we recommend testing your final bundle in your specific development environment. This ensures that the generated configuration aligns perfectly with your existing plugins, loader settings, and project requirements.

Free Browser Target Polyfill & Core-JS Configuration Previewer