What is a ProlyFill

Prollyfills vs. Polyfills: What’s the Difference?

Prolyfills are quite similar to polyfills in many ways. The biggest difference being that they often target proposals or specifications with in-flux APIs. Sometimes they even target untested or unspecified ideas altogether. In both cases, much of the ideas that surround the prolyfill, including the API, are expected to change greatly as the idea is debated, tested, and possibly accepted for standardization.

In addition, the purpose of building a prollyfill differs from that of a polyfill. Polyfills are typically built to allow developers to rely on new features and APIs across all greenfield platforms.