message: chore(tslint): update tslint rules
diff: "no-duplicate-variable": true,
  "no-var-keyword": true,
  "no-empty": true,
  - "no-unused-expression": true,
  + "no-unused-expression-chai": true
  "no-unused-variable": true,
  "no-use-before-declare": true,
  "no-var-requires": true,
  "check-separator",
  "check-type"
  ]
  - }
  + },
  + "rulesDirectory": [
  + "tslint-no-unused-expression-chai"
  + ]
  }
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