Steps to adding a custom TSLint rule

1. Make a new file, the name is important, it must be camel-case and not a .ts file (the @ts-check declaration at the top of each file uses JSDoc to check types while developing rules – read here for more info). The suffix must be ...Rule.js.

2. You will need to convert your camelCase name to kebab-case and add it to the tslint.json

   E.g. noDoingAnythingRule.js -> no-doing-anything and:

   {
     "extends": ["tslint:recommended", "tslint-react", "tslint-config-prettier"],
     "rules": {
       "no-import-un-mocked": true,
   +    "no-doing-anything": true,
       "curly": false,
       ...

3. You want to export a class called Rule that lints your file, this is what it used on the file.

4. Ideally you can do simple string matching like in noImportUnMockedRule.js - but if not, study how to make an AST walker here