An entire row or column. Click the row or column heading. Row heading. Column heading. You can also select cells in a row or column by selecting the first cell and then pressing CTRL+SHIFT+ARROW key (RIGHT ARROW or LEFT ARROW for rows, UP ARROW or DOWN ARROW for columns).
If you like this, you might also like hihat. It is very similar, but more focused on running and testing browser applications. Hihat uses browserify to bundle everything into a single source file, and uses watchify for incremental file changes. In some ways, devtool is a spiritual successor to hihat.
Run the command to open a new DevTools window. You can specify --watch multiple times to watch different files/globs. If a custom --index is passed, it will also be watched for changes. If -- is given, anything after it will be used as the arguments for the app's process.argv. This way you can avoid polluting your program arguments with those specific to devtool. The --browser-field or --bf makes the require() statements respect the package.json browser field.