How to invoke functions?

I want to know how to invoke functions defined in packages/functions in my NextJS application inside packages/web. Example:

new Function(stack, 'my-function', {
    handler: 'packages/functions/index.handler',
    FunctionName: 'my-function',
    InvocationType: 'Event',

For now, I do not want to use SQS, Events or API. The AWS Lamba offers a feature that is possible to invoke a function asynchronously just passing InvocationType: 'Event'.

How can I do that in SST framework?