ANTLR 4 JavaScript Runtime

The `antlr4` package provides the JavaScript runtime libraries for ANTLR 4, a powerful parser generator tool. It enables parsing various languages and data formats in Node.js (requiring Node.js >= 16) and major browsers like Safari, Firefox, and Chrome. The current stable version is 4.13.2, with minor updates released periodically. A key differentiator is its role as the official runtime for grammars defined using the ANTLR tool, supporting 10 target languages. Due to this multi-target consistency, ANTLR's versioning does not strictly follow npm semantic versioning, meaning minor version bumps can introduce breaking changes across targets; users are strongly advised to pin exact versions. The library ships with comprehensive TypeScript type definitions, making it suitable for modern TypeScript development.