To debug a generator, you can pass Node.js debug flags by running it like this:
# OS X / Linux
node --debug `which yo` <generator> [arguments]
# Windows
# Find the path to the yo binary in Command Prompt
where yo
# Or find the path to the yo binary in PowerShell
get-command yo
# Would be something like C:\Users\<USER>\AppData\Roaming\npm\yo
# Use this path to derive yo cli.js file
# C:\Users\<USER>\AppData\Roaming\npm\node_modules\yo\lib\cli.js
node --debug <path to yo cli.js> <generator> [arguments]
Yeoman generators also provide a debug mode to log relevant lifecycle information. You can activate it by setting the DEBUG environment variable to the desired scope (the scope of the generator system is yeoman:generator).
# OS X / Linux
DEBUG=yeoman:generator
# Windows
set DEBUG=yeoman:generator
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