UTF-8 Encoder/Decoder for JavaScript

The `utf8.js` package, currently at its stable version 3.0.0 (last updated in late 2017), provides a comprehensively tested and robust JavaScript implementation for encoding and decoding UTF-8 strings. It distinguishes itself by strictly adhering to the Encoding Standard, ensuring precise handling of all scalar Unicode code point values. A core aspect of its design is strict error handling: the library explicitly throws an `Error` when attempting to encode non-scalar values (such as lone surrogates) or when encountering malformed UTF-8 data during decoding. This approach prioritizes data integrity over silent error correction. For developers requiring the ability to encode or decode non-scalar values, the related `WTF-8` library is recommended. Given its foundational utility and mature status, the project is considered to be in maintenance mode, receiving updates primarily for critical issues rather than frequent feature additions.