Generate precise Babel @babel/preset-env target configurations and browserslist queries. A free, browser-based tool for optimized JavaScript transpilation.
AI Generation Prompt
Application Overview
A robust, interactive web-based utility for generating configuration objects and query strings for @babel/preset-env and browserslist. This tool provides a GUI to define targeted browser environments, preventing errors in build configuration files.
Core Features
- Dynamic Target Selection: An interactive list of major browsers (Chrome, Firefox, Safari, Edge, iOS, Android, Opera) with version inputs.
- Format Switching: Toggle between generating a JSON object for
babel.config.jsor a standardbrowserslistquery string. - Real-Time Validation: Instant feedback loop that warns if the selected browser versions are contradictory or logically unsupported.
- One-Click Export: High-visibility 'Copy to Clipboard' functionality with visual feedback on success.
- Preset Presets: Quick-select buttons for common industry standards (e.g., 'Last 2 versions', 'defaults', '> 0.5%, last 2 versions, not dead').
- Live Preview: A code-block display that updates instantly as the user modifies the input parameters.
UI Layout
- Header: Clean, centered title with a brief subtitle explaining the utility.
- Main Content (Two-Column Layout):
- Left Column (Inputs): A scrollable form area grouped by browser vendor. Each vendor has a toggle (enabled/disabled) and a number input for the minimum version.
- Right Column (Output): A sticky container displaying the generated code snippet with syntax highlighting. Includes a 'Copy' button.
- Global Header Actions: Buttons to 'Reset to Defaults' and 'Clear All'.
Design System & Aesthetics
- Color Palette:
- Background:
#FFFFFF(Pure White). - Primary Action Color:
#2563EB(Bright Blue) for buttons. - Surface Color:
#F9FAFB(Soft Gray) for card backgrounds. - Text Color:
#111827(Dark Slate) for maximum readability. - Success State:
#059669(Emerald) for copy confirmation animations.
- Background:
- Typography: Inter or System-UI font stack for a clean, modern SaaS appearance.
- Transitions: Micro-interactions on hover and focus states (ease-in-out, 200ms duration). Smooth height expansion for code result containers.
Technical Directives
- Architecture: Single HTML file containing all
<style>and<script>tags. - State Management: Use plain JavaScript objects in memory. Explicitly strictly forbid the use of
localStorage,sessionStorage, or cookies. - Responsiveness: Use Tailwind CSS for a mobile-first grid layout. Stack columns on screens < 768px, side-by-side on larger screens.
- Iframe Compatibility:
- No
alert(),prompt(), orconfirm(). Use a custom modal overlay for user communication. - Ensure all generated code is sanitized for display.
- No external analytics tracking or tracking pixels.
- No
- Code Delivery: Minimize external dependencies. Use only high-quality, lightweight CDNs for essential frameworks (e.g., Tailwind via CDN, PrismJS for syntax highlighting).
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Files being used
Frequently Asked Questions
Everything you need to know about using this application.
What is the purpose of the Babel Preset Env Target Builder?
The Babel Preset Env Target Builder is designed to simplify the creation of browser compatibility configurations for modern JavaScript development. By selecting specific browser versions and environments, the tool automatically generates the correct JSON object structure for your babel.config.js or the equivalent browserslist query string, ensuring your project only compiles code for the environments you actually support. This tool is particularly valuable for developers aiming to reduce bundle sizes. By avoiding unnecessary polyfills and syntax transformations for obsolete browsers, you can significantly improve website performance and reduce the volume of JavaScript served to your users.
How do I choose the correct browser targets for my project?
Choosing the right targets depends on your target audience and analytics data. Generally, you should aim for the 'last 2 versions' of major browsers, or use specific versions based on the minimum browser requirements dictated by your project's business constraints or accessibility policy. It is often recommended to balance between modern features and compatibility. Using this tool allows you to iteratively test different target configurations, seeing how the resulting output changes, which helps in making an informed decision about the trade-offs between code size and feature availability.
Why is this tool useful compared to manually editing config files?
Manually editing browser configuration strings or nested JSON objects is prone to syntax errors and typos. This tool provides a visual, interactive interface that validates your input in real-time, preventing common configuration issues such as invalid query syntax or unsupported browser keys, which can lead to silent failures in your build pipeline. Furthermore, by providing an immediate, copy-ready output, it eliminates the need to refer to external documentation for the complex syntax rules of browserslist. This streamlines the configuration process, allowing developers to focus on application logic rather than build tool minutiae.
Is this tool secure and how does it handle my configuration data?
This application runs entirely in your browser. All processing, validation, and generation of configuration strings happen locally on your machine using client-side JavaScript. No data is sent to a server, and no information is stored, meaning your configuration parameters remain private and secure. Because the tool is sandboxed and does not use persistent storage like cookies or local storage, it is safe to use in any environment, including restricted corporate networks or high-security browser settings. You can simply refresh the page to reset the application to its default state.
