Subtle bug in the severity rules when using nested tslint.json files

[jonaskello]

Bug Report

• TSLint version: 5.0.0
• TypeScript version: 2.2.2
• Running TSLint via: CLI

TypeScript code being linted

Minimal repro with failing travis build available here:

https://github.com/jonaskello/tslint-repro

Actual behavior

When I have nested tslint.json files the no-consecutive-blank-lines rule fails with this error:

Error: Severity for rule 'no-consecutive-blank-lines not found

See the travis build for full stack.

The same seems to happen with the whitespace and semicolon rules.

Expected behavior

To sucessfully lint without exceptions.

[jonaskello]

Btw, I extracted this repro from a larger code base where I got the error. I managed to work around it now. With tslint4 our linting took about 17 seconds. Now with tslint5 it takes 7 seconds. Thank you for the performance boost 👍 🚀.

[huy-nguyen]

I'm having this problem as well. @jonaskello How did you work around this bug?

[jonaskello]

I temporarily removed the nested tslint.json file from the sub-tree. This way the rules from the parent tslint.json is applied to the code in the sub-tree. This gave me a bunch of error because the rules in the parent are not meant to be applied to the sub-tree (hence the nested tslint.json). However from these errors I filtered out only errors concerning no-consecutive-blank-lines, whitespace, and semicolon and fixed those in the sub-tree. Then I put the nested tslint.json back and it worked. Seems only those three rules are affected by this bug.