spencermountain/compromise ? reverse-engineered prompt

Build me a lightweight JavaScript natural language processing library that can run in the browser and in Node, for turning plain text into something I can query and edit.

I want it to understand basic things like verbs, nouns, numbers, contractions, and simple named entities, so I can ask questions like does this text contain a pattern, grab matching phrases, or change a sentence from present to past tense or singular to plural. It should also let me get structured data back from text in a simple format, and work well enough for common everyday text without being overly fancy.

Please include a few clear examples and a small demo page I can open locally to try it out. If you need current docs or implementation details, look them up online and keep the API pleasant and easy to use.