Why am I getting an ExecJS::RuntimeError on Windows when running a Rails application?

ExecJS::RuntimeError on Windows Encountered While Following the Ruby Tutorial

This error occurs when attempting to run JavaScript code in a Rails application on Windows. The root cause lies in an issue with ExecJS, a gem that enables Ruby to execute JavaScript.

Possible Solutions:

1. Remove "= require_tree .":

While removing this line might resolve the immediate issue, it only conceals the underlying ExecJS-related problem.

2. Install Node.js:

Using Node.js as the JavaScript runtime sidesteps the issue, but requires installing additional software.

3. Fix the ExecJS Issue:

Edit the ExecJS "runtimes.rb" file to modify the JScript runtime configuration:

• Remove "//U" from the ":command" line.
• Change ":encoding" to 'UTF-8'.

Updated "runtimes.rb" Section:

JScript = ExternalRuntime.new(
    :name        => "JScript",
    :command     => "cscript //E:jscript //Nologo",
    :runner_path => ExecJS.root + "/support/jscript_runner.js",
    :encoding    => 'UTF-8' # CScript with //U returns UTF-16LE
)

After modifying "runtimes.rb," restart the Rails server to see if the issue persists. Refer to the GitHub thread where the issue was originally discussed for further assistance: https://github.com/sstephenson/execjs/issues/81#issuecomment-9892952

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