spidermonkey@140 for Mac

SpiderMonkey is a JavaScript and WebAssembly engine developed by Mozilla, used by projects such as the Firefox browser and Servo. Written in C++ and Rust, it not only powers script execution within the browser but also offers a standalone command-line version, making it easy for developers to execute JavaScript code directly in the terminal, debug scripts, or perform automated processing. For programmers who need to run JS without relying on a browser environment, technical staff who want to study engine behavior, or developers looking to embed scripting capabilities into their own toolchains, it is a reliable choice. Its command-line form makes it easy to integrate into build processes and daily development work, suiting those interested in low-level implementation who also wish to keep a lightweight way of working.