Revert "Migrating from eslintrc.json to eslint.config.js (#2660)"

This reverts commit 1104967.

.eslintignore

@@ -0,0 +1,8 @@
+# Contains the PDF file of the Tag as JSON string, thus does not need to be linted
+src/components/CheckIn/tagTemplate.ts
+package.json
+package-lock.json
+tsconfig.json
+
+# Ignore the Docusaurus website subdirectory
+docs/**

.eslintrc.json

@@ -0,0 +1,157 @@
+{
+  "env": {
+    "browser": true,
+    "node": true,
+    "es6": true
+  },
+
+  "extends": [
+    "plugin:react/recommended",
+    "eslint:recommended",
+    "plugin:jest/recommended",
+    "plugin:prettier/recommended",
+    "plugin:@typescript-eslint/recommended",
+    "eslint-config-prettier",
+    "prettier"
+  ],
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+
+  "plugins": [
+    "react",
+    "@typescript-eslint",
+    "jest",
+    "import",
+    "eslint-plugin-tsdoc",
+    "prettier"
+  ],
+  "rules": {
+    "react/destructuring-assignment": "error",
+    "@typescript-eslint/explicit-module-boundary-types": "error",
+    "react/no-multi-comp": [
+      "error",
+      {
+        "ignoreStateless": false
+      }
+    ],
+    "react/jsx-filename-extension": [
+      "error",
+      {
+        "extensions": [".tsx"]
+      }
+    ],
+    "import/no-duplicates": "error",
+    "tsdoc/syntax": "error",
+    "@typescript-eslint/ban-ts-comment": "error",
+    "@typescript-eslint/no-unused-vars": "error",
+    "@typescript-eslint/no-explicit-any": "error",
+    "@typescript-eslint/no-inferrable-types": "error",
+    "@typescript-eslint/no-non-null-asserted-optional-chain": "error",
+    "@typescript-eslint/no-non-null-assertion": "error",
+    "@typescript-eslint/no-var-requires": "error",
+    "@typescript-eslint/no-unsafe-function-type": "error",
+    "@typescript-eslint/no-wrapper-object-types": "error",
+    "@typescript-eslint/no-empty-object-type": "error",
+    "@typescript-eslint/no-duplicate-enum-values": "error",
+    "@typescript-eslint/array-type": "error",
+    "@typescript-eslint/consistent-type-assertions": "error",
+    "@typescript-eslint/consistent-type-imports": "error",
+    "@typescript-eslint/explicit-function-return-type": [
+      2,
+      {
+        "allowExpressions": true,
+        "allowTypedFunctionExpressions": true
+      }
+    ],
+    "camelcase": "off",
+    "@typescript-eslint/naming-convention": [
+      "error",
+
+      {
+        "selector": "interface",
+        "format": ["PascalCase"],
+        "prefix": ["Interface", "TestInterface"]
+      },
+
+      {
+        "selector": ["typeAlias", "typeLike", "enum"],
+        "format": ["PascalCase"]
+      },
+      {
+        "selector": "typeParameter",
+        "format": ["PascalCase"],
+        "prefix": ["T"]
+      },
+      {
+        "selector": "variable",
+        "format": ["camelCase", "UPPER_CASE", "PascalCase"],
+        "leadingUnderscore": "allow"
+      },
+      {
+        "selector": "parameter",
+        "format": ["camelCase"],
+        "leadingUnderscore": "allow"
+      },
+      {
+        "selector": "function",
+        "format": ["camelCase", "PascalCase"]
+      },
+      {
+        "selector": "memberLike",
+        "modifiers": ["private"],
+        "format": ["camelCase"],
+        "leadingUnderscore": "require"
+      },
+
+      {
+        "selector": "variable",
+        "modifiers": ["exported"],
+        "format": null
+      }
+    ],
+
+    "react/jsx-pascal-case": [
+      "error",
+      { "allowAllCaps": false, "allowNamespace": false }
+    ],
+
+    "react/jsx-equals-spacing": ["warn", "never"],
+    "react/no-this-in-sfc": "error",
+
+    "jest/expect-expect": 0,
+
+    "react/no-unstable-nested-components": ["error", { "allowAsProps": true }],
+    "react/function-component-definition": [
+      0,
+      { "namedComponents": "function-declaration" }
+    ],
+    "prettier/prettier": "error"
+  },
+
+  "settings": {
+    "react": {
+      "version": "detect"
+    }
+  },
+  "ignorePatterns": [
+    "**/*.css",
+    "**/*.scss",
+    "**/*.less",
+    "**/*.json",
+    "**/*.svg",
+    "docs/docusaurus.config.ts",
+    "docs/sidebars.ts",
+    "docs/src/**",
+    "docs/blog/**"
+  ]
+}