Polymer Build

Polymer Build (current version 3.1.4) is a Node.js library designed for building Polymer web component projects. It provides a highly customizable, stream-based pipeline for processing project source files and their dependencies, using Vinyl file objects. While the Polymer CLI utilizes `polymer-build` internally for its `build` command, this library offers greater flexibility for developers who require custom build steps, specific optimizers, or advanced stream manipulations not available through the CLI's pre-configured options. `polymer-build` enables direct interaction with build streams, allowing integration with other Node.js stream-based tools like Gulp. The Polymer ecosystem, including `polymer-build`, has largely been superseded by Lit for modern web component development, meaning this library is in a deprecated state with no new feature development expected.