Assets
Customize Hyas SCSS or Hyas JS. Add a Lambda function.
..
├── fonts/
├── images/
├── js/
│   ├── vendor/
│   ├── app.js
│   └── index.js
├── lambda/
└── scss/
    ├── common/
    ├── components/
    ├── layouts/
    ├── vendor/
    └── app.scss
See also the Hugo docs: Hugo Pipes.
Customize Hyas SCSS
Set variables in `./assets/scss/common/_variables.scss`.
See also the Bootstrap code: Variables.
./assets/scss/app.scss
Customize Hyas JS
./assets/js/app.js
Add a Lambda function
See also: Functions
Example
./assets/lambda/hi-from-lambda.js
exports.handler = (event, context, callback) => {
  callback (null, {
    statusCode: 200,
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      message: 'Hi from Lambda.',
    }),
  });
}