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The Challenge with ES6 Imports in Pega

The primary reason your import statements aren't compiling is that Pega's standard JavaScript handling doesn't natively support ES6 module syntax (like import { something } from 'somewhere'). This is because Pega processes JavaScript files differently than a typical web application that might use modern bundling systems.

Solutions to Make Import Syntax Work

Here are several approaches you can implement:

1. Use a JavaScript Module Bundler Before Adding to Pega

The most effective solution is to pre-process your JavaScript files with a module bundler like Webpack or Rollup before incorporating them into Pega:

1. Set up a simple Webpack/Rollup configuration that processes your ES6 modules
2. Bundle all dependencies into a single output file that doesn't rely on ES6 imports
3. Add the resulting bundled file to your Pega application as a JavaScript text file

This approach allows you to write modern ES6 code with imports while ensuring compatibility with Pega's JavaScript handling.

2. Store JavaScript in Static Content Bundles

As per Pega's best practices:

1. Create a static content bundle for your JavaScript files
2. Include all required dependencies in the correct order within this bundle
3. Ensure that the ordering in the bundle respects dependency relationships

This method works well when you have multiple related JavaScript files that need to be loaded together.

3. Alternative Import Approaches

If module bundlers aren't an option, consider these alternatives:

• Use global namespace objects instead of ES6 modules
• Use IIFE (Immediately Invoked Function Expression) patterns to manage scope
• Implement a simple dependency management system through a global registry

4. Browser Compatibility Considerations

Ensure you're using browsers that fully support ES6 features. Pega Platform supports modern browsers including Microsoft Edge Chromium, Mozilla Firefox, Apple Safari, and Google Chrome, but the specific JavaScript features supported depend on the browser version.

Best Practices for JavaScript in Pega

Regardless of your approach, follow these best practices:

• Store JavaScript code in separate JS files rather than inline scripts
• Test third-party scripts before deployment to avoid conflicts
• Pay attention to script loading order, as they run sequentially
• If the custom control is used in multiple sections, consider attaching the JavaScript file to the Portal harness
• For infrequently used controls, load the JavaScript file at the end of stream processing using the <pega:static> JSP tag

References: Custom JavaScript in application design Best practices for using custom JavaScript Support discussions on ES6 syntax