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Read this on the main serverless docs site
Using External libraries in Node.js Example
Make sure serverless is installed. See installation guide.
1. Install dependencies
For this example we are going to install the faker module from npm.
npm install faker --save
2. Install the faker module in your handler.js file
Inside of handler.js require your module:
const faker = require('faker');
3. Deploy
Run serverless deploy.
Alternatively, you can run npm run deploy and deploy via NPM script defined in the package.json file
4. Invoke
serverless invoke --function helloRandomName