is-expression

The `is-expression` package provides a utility function for synchronously validating if a given string is a syntactically correct JavaScript expression. It is currently at version 4.0.0 and appears to have an infrequent release cadence, with the latest major update focusing on parser upgrades. The library uses Acorn under the hood to perform its parsing, allowing for detailed error reporting when the `throw` option is enabled. Key differentiators include its simplicity, direct integration with Acorn options, and the ability to toggle strict mode or allow line comments, making it suitable for environments like templating engines (e.g., Pug) or dynamic code evaluation where robust expression validation is crucial. It focuses purely on syntax, not semantic validity or runtime behavior.