Andreas Fernandez authored Sep 23, 2019 and Frank Nägler committed Sep 25, 2019

TSLint is in a deprecation phase, recommending to migrate to ESLint
instead. This patch removes all TSLint packages and supplies a proper
ESLint configuration.

Also, rule violations are fixed in this patch.

Executed commands:

  yarn add --dev typescript-eslint \
    @typescript-eslint/parser \
    @typescript-eslint/eslint-plugin \
    eslint grunt-eslint

  yarn remove tslint grunt-tslint

  ./node_modules/.bin/eslint -c eslintrc.js --fix --ext .ts \
    ./Sources/TypeScript/

Resolves: #89232
Releases: master
Change-Id: I3bd4a1c30ecc27f8c334951547aff5e9352629da
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61784


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>