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jsvu

jsvu is the JavaScript (engine) Version Updater.

jsvu makes it easy to install recent versions of various JavaScript engines without having to compile them from source.

Installation

Note: jsvu requires Node.js v14+. (jsvu follows the latest active LTS version of Node.)

Install the jsvu CLI:

npm install jsvu -g

Modify your dotfiles (e.g. ~/.bashrc) to add ~/.jsvu to your PATH:

export PATH="${HOME}/.jsvu:${PATH}"

Then, run jsvu:

jsvu

On first run, jsvu prompts you for your operating system and architecture, and the list of JavaScript engines you wish to manage through jsvu. It then downloads and installs the latest version of each of the engines you selected.

To update the installed JavaScript engines later on, just run jsvu again.

Supported engines per OS

^* JavaScriptCore requires external dependencies to run on Windows:

• On 32-bit Windows, install iTunes.
• On 64-bit Windows, download the latest WinCairoRequirements and add its bin64 directory to your PATH.

Integration with eshost-cli

eshost-cli makes it easy to run and compare code in all JavaScript engines that jsvu installs.

First, install eshost-cli:

npm install -g eshost-cli

Then, either automatically configure jsvu-installed hosts:

eshost --configure-jsvu

…or tell eshost-cli where jsvu installs each JavaScript engine following the instructions below.

Linux/Mac

eshost --add 'Chakra' ch ~/.jsvu/chakra
eshost --add 'GraalJS' graaljs ~/.jsvu/graaljs
eshost --add 'JavaScriptCore' jsc ~/.jsvu/javascriptcore
eshost --add 'QuickJS' qjs ~/.jsvu/quickjs
eshost --add 'SpiderMonkey' jsshell ~/.jsvu/spidermonkey
eshost --add 'V8 --harmony' d8 ~/.jsvu/v8 --args '--harmony'
eshost --add 'V8' d8 ~/.jsvu/v8
eshost --add 'XS' xs ~/.jsvu/xs

Windows

eshost --add "Chakra" ch "%USERPROFILE%\.jsvu\chakra.cmd"
eshost --add "GraalJS" graaljs "%USERPROFILE%\.jsvu\graaljs.cmd"
eshost --add "JavaScriptCore" jsc "%USERPROFILE%\.jsvu\javascriptcore.cmd"
eshost --add "SpiderMonkey" jsshell "%USERPROFILE%\.jsvu\spidermonkey.cmd"
eshost --add "V8 --harmony" d8 "%USERPROFILE%\.jsvu\v8.cmd" --args "--harmony"
eshost --add "V8" d8 "%USERPROFILE%\.jsvu\v8.cmd"
eshost --add "XS" xs "%USERPROFILE%\.jsvu\xs.cmd"

That’s it! You can now run code snippets in all those engines with a single command:

eshost -e 'new RegExp("\n").toString()' # https://crbug.com/v8/1982

eshost -e '(function maxCallStackSize() { try { return 1 + maxCallStackSize(); } catch (_) { return 1; }}())'

eshost -e 'Date.parse("1 Octopus 2018")'

Integration with non-interactive environments

On your personal devices, the only command you’ll ever need is jsvu as described above. There are no command-line flags to remember.