Install the plugin using
npm i gridsome-plugin-gtag
Put your Google Analytics ID in you environment variables with a name
similar to GOOGLE_ANALYTICS_ID
.
Then add the following to you gridsome.config.js
plugins array
{
use: 'gridsome-plugin-gtag',
options: {
config: {
id: process.env.GOOGLE_ANALYTICS_ID,
},
},
},