Fix/eslint rules

[jackey8616]

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you written unit tests?
• Have you written unit tests that cover the negative cases (i.e.: if bad data is submitted, does the library respond properly)?
• This PR is associated with an existing issue?

#1165

Fixed rules:

• Regular file
  • @typescript-eslint/no-var-requires
  • @typescript-eslint/member-delimiter-style
  • @typescript-eslint/explicit-module-boundary-types
  • @typescript-eslint/no-non-null-assertion
  • no-shadow
• tests/**/*.ts
  • @typescript-eslint/no-non-null-assertion
  • @typescript-eslint/no-unused-expressions
  • @typescript-eslint/restrict-template-expressions