ESLint tooling and enforcement(#1492)

* add eslint-prettier

* add lint-staged

* ignore .eslintcache

* remove unused import

* attempt test change

* Revert "attempt test change"

This reverts commit 78d0e31d41.

* attempt to add error

* Revert "attempt to add error"

This reverts commit a5885c0942.

* add error

* create config

* add comment

* tweak glob

* Revert "add error"

This reverts commit 3187522396.

* add python error

* Revert "add python error"

This reverts commit d0b116ed15.

* lint on push + PR

* Revert "add comment"

This reverts commit efa4eb6676.

* add prettier rules to ESLint

* remove lint-diff targets

client/package.json

@@ -84,6 +84,7 @@
     "eslint-plugin-import": "^2.20.2",
     "eslint-plugin-jest": "^23.8.2",
     "eslint-plugin-jsx-a11y": "^6.2.3",
+    "eslint-plugin-prettier": "^3.1.3",
     "eslint-plugin-react": "^7.19.0",
     "eslint-plugin-react-hooks": "^2.5.1",
     "express": "^4.17.1",
@@ -91,9 +92,11 @@
     "file-loader": "^6.0.0",
     "html-webpack-inline-source-plugin": "^1.0.0-beta.2",
     "html-webpack-plugin": "^4.0.0",
+    "husky": "^4.2.5",
     "jest": "^25.2.7",
     "jest-puppeteer": "^4.4.0",
     "json-loader": "^0.5.7",
+    "lint-staged": "^10.2.4",
     "mini-css-extract-plugin": "^0.9.0",
     "optimize-css-assets-webpack-plugin": "^5.0.3",
     "puppeteer": "^2.1.1",
@@ -146,5 +149,10 @@
         ]
       }
     }
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged --config \"./configuration/lint-staged/lint-staged.config.js\""
+    }
   }
 }