Added null checks as warnings (!352)

Co-authored-by: clodan <clodan@clodan.com>
Reviewed-on: https://dev.sp-tarkov.com/SPT/Server/pulls/352
Co-authored-by: Alex <clodan@noreply.dev.sp-tarkov.com>
Co-committed-by: Alex <clodan@noreply.dev.sp-tarkov.com>

project/.eslintrc.json

@@ -1,4 +1,7 @@
 {
+    "parserOptions": {
+        "project": "./tsconfig.strictNullChecks.json"
+    },
     "extends": [
         "plugin:@typescript-eslint/recommended",
         "plugin:@stylistic/recommended-extends",
@@ -6,7 +9,7 @@
         "plugin:import/typescript",
         "prettier"
     ],
-    "plugins": ["@typescript-eslint", "@stylistic", "import", "unused-imports", "switch-allman"],
+    "plugins": ["@typescript-eslint", "@stylistic", "import", "unused-imports", "switch-allman", "strict-null-checks"],
     "settings": {
         "import/resolver": {
             "typescript": {
@@ -99,7 +102,8 @@
             }
         ],
         "unused-imports/no-unused-imports-ts": "error",
-        "switch-allman/case-allman": "error"
+        "switch-allman/case-allman": "error",
+        "strict-null-checks/all": "warn"
     },
     "overrides": [
         {

project/package.json

@@ -74,6 +74,7 @@
         "eslint-import-resolver-typescript": "~3.6",
         "eslint-plugin-import": "~2.29",
         "eslint-plugin-prettier": "~5.1",
+        "eslint-plugin-strict-null-checks": "~0.1",
         "eslint-plugin-switch-allman": "~1.0",
         "eslint-plugin-unused-imports": "~3.2",
         "fs-extra": "~11.2",

project/tsconfig.strictNullChecks.json

@@ -0,0 +1,6 @@
+{
+    "extends": "./tsconfig.base.json",
+    "compilerOptions": {
+      "strictNullChecks": true,
+    }
+}