Why Does ExecJS Fail on Windows With 'sessions.js.coffee' and How Can It Be Fixed?

ExecJS RuntimeError in Static Pages Home

In the provided code, an ExecJS::RuntimeError arises due to an issue with the Windows JavaScript runtime. The error specifically occurs when evaluating the JavaScript file "sessions.js.coffee" while rendering the "application.html.erb" layout. The cause appears to be a problem with ExecJS properly interacting with the built-in JavaScript runtime on the Windows system.

Solution

Instead of ignoring the problem or installing Node.js, it is recommended to investigate the root cause of the issue. The solution involves modifying the "runtimes.rb" file in the ExecJS gem.

Detailed Steps

1. Locate the "runtimes.rb" file within the ExecJS gem.
2. Make a backup copy of the file.
3. Edit the original "runtimes.rb" file.

4. In the section beginning with "JScript = ExternalRuntime.new", make the following changes:

   • Remove "//U" from the ":command" line.
   • Change "UTF-16LE" to "UTF-8" in the ":encoding" line.
5. Save the modified file.
6. Restart your Rails server.
7. Refresh the page in the browser that previously produced the error.

Alternative Options

• Disable "//= require_tree .": This approach involves removing the "//= require_tree ." line from "application.js". While this suppresses the error, it doesn't address the underlying issue and ignores the problem.
• Install Node.js: This is a viable alternative, but it requires installing additional software and avoids resolving the root cause.

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