Constantinople Constant Expression Evaluator

Constantinople is a JavaScript utility package, currently at stable version 4.0.1, designed to determine if a given JavaScript expression evaluates to a constant. It parses the expression into an Abstract Syntax Tree (AST) using Babylon (now part of Babel's parser) to analyze its predictability. The library prioritizes safety, conservatively returning `false` if there's any uncertainty, ensuring reliability for build tools and static analysis where incorrect constant detection could cause issues. It also provides a `toConstant` function to safely evaluate expressions identified as constant, throwing an error if the expression is not constant. The package ships with TypeScript type definitions, enhancing developer experience for TypeScript users.