Typescript support

### Expected Behaviour
Should be able to use in context with Typescript

### Actual Behaviour
Does not work, errors when specifying Model attributes as not found

### Reproduce Scenario (including but not limited to)
Try running in a typescript enabled project

#### Steps to Reproduce
Write any example model inside the typescript contexts

#### Platform and Version
Any

Start by reproducing the issue in a TypeScript-enabled project using the example model described in the issue. Trace why model attributes are reported as missing, then verify that the model works in a TypeScript context without those errors.

Written by the indexing model from the issue text.