## Summary
The io-ts package was too large and needed to broken down more by domain to decrease the lists plugin size and any other plugin wanting to use the packages will not incur big hits as well.
Before we had one large io-ts package:
```
@kbn/securitysolution-io-ts-utils
```
Now we have these broken down 4 packages:
```
@kbn/securitysolution-io-ts-utils
@kbn/securitysolution-io-ts-types
@kbn/securitysolution-io-ts-alerting-types
@kbn/securitysolution-io-ts-list-types
```
Deps between these packages are:
```
@kbn/securitysolution-io-ts-utils (none)
@kbn/securitysolution-io-ts-types -> @kbn/securitysolution-io-ts-utils
@kbn/securitysolution-io-ts-alerting-types -> @kbn/securitysolution-io-ts-types, @kbn/securitysolution-io-ts-utils
@kbn/securitysolution-io-ts-list-types -> @kbn/securitysolution-io-ts-types, @kbn/securitysolution-io-ts-utils
```
Short description and function of each (Also in each of their README.md):
```
@kbn/securitysolution-io-ts-utils, Smallest amount of utilities such as format, validate, etc...
@kbn/securitysolution-io-ts-types, Base types such as to_number, to_string, etc...
@kbn/securitysolution-io-ts-alerting-types, Alerting specific types such as severity, from, to, etc...
@kbn/securitysolution-io-ts-list-types, list specific types such as exception lists, exception list types, etc...
```
### Checklist
Delete any items that are not applicable to this PR.
- [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios
Co-authored-by: Frank Hassanabad <frank.hassanabad@elastic.co>
## Summary
We are removing duplicated code in sections of plugins into the kibana/packages folder. This is phase 1 of 4+ where:
Phase 1: Lift and shift the io-ts code into `kibana/packages/kbn-securitysolution-io-ts-utils`
Phase 2: Deprecate the utils across plugins any copied code
Phase 3: Replace the deprecated types with the ones in here where we can. [Strangle pattern](https://martinfowler.com/bliki/StranglerFigApplication.html)
Phase 4+: (potentially) consolidating any duplication or everything altogether with the `kbn-io-ts-utils` project
### Checklist
- [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios
Co-authored-by: Frank Hassanabad <frank.hassanabad@elastic.co>
