fix(eslint): recognise type usage

I'm not sure why @typescript-eslint/typescript-estree has been used: I can't see any useful information about it. All documentation points to using @typescript-eslint/parser, which has been installed already. The only noticeable difference is that it doesn't understand when a type has been used, leading to @typescript-eslint/no-unused-vars errors.

I've added a separate TypeScript config file that includes all files in the codebase, as the new parser will error if it tries to load a file that hasn't been included.

Refs #398, #422, ba132cc

.eslintrc.json

@@ -39,11 +39,9 @@
         "**/*.ts",
         "**/*.tsx"
       ],
-      "parser": "@typescript-eslint/typescript-estree",
+      "parser": "@typescript-eslint/parser",
       "parserOptions": {
-        "sourceType": "module",
-        "project": "./tsconfig.json",
-        "allowImportExportEverywhere": true
+        "project": "./tsconfig.dev.json"
       },
       "extends": [
         "plugin:react/recommended",

Dockerfile

@@ -108,6 +108,7 @@ COPY \
   .proxyrc \
   docker-entrypoint.sh \
   jest.config.ts \
+  tsconfig.dev.json \
   ./
 
 COPY --from=scripts /app/dist/scripts/ dist/scripts/

tsconfig.dev.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "include": [
+    "**/*",
+    "**/.*"
+  ]
+}