5.13 introduced a breaking change

[alan-agius4]

Bug Report

• TSLint version: 5.13
• TypeScript version: 3.2
• Running TSLint via: (pick one) API

This commit 9000479 caused the API signature to changes and caused a breaking change in a minor release of tslint for API users.

The issue is that now format method needs an additional parameter which is not optional, and hence it will be fail during compile time and during runtime since fileNames is not specified.

Expected behavior

Possible solutions;

1. Revert the change, release a patch & release this in a major
2. Make this optional

Relates to angular/angular-cli#13783

[adidahiya]

Ah, sorry about that, I should have been more careful about AbstractFormatter and made sure its signature matched IFormatter exactly so that this break wouldn't happen (I was only focusing on IFormatter because that's the only one exported as public API)... maybe there's room for a lint rule here like #4175 to catch this in the future

[adidahiya]

I'll fix this and release 5.13.1

[alan-agius4]

Thank you