Add eslint (#610)

shared/eslintrc.json

@@ -0,0 +1,29 @@
+{
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint"],
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:import/recommended",
+    "plugin:import/typescript",
+    "prettier"
+  ],
+  "rules": {
+    "@typescript-eslint/no-explicit-any": "off", // TODO: This should be re-enabled
+    "@typescript-eslint/no-unused-vars": ["warn", { "args": "none" }],
+    "@typescript-eslint/explicit-member-accessibility": [
+      "error",
+      {
+        "accessibility": "no-public"
+      }
+    ],
+    "@typescript-eslint/no-this-alias": [
+      "error",
+      {
+        "allowedNames": ["self"]
+      }
+    ],
+    "no-console": "warn",
+    "import/no-unresolved": "off" // TODO: Look into turning off once each package is an actual package.
+  }
+}