fix: make it compile with strictNullChecks set to true like in our config file

Author: chriswk

package.json

@@ -35,21 +35,21 @@
   "scripts": {
     "start": "TZ=UTC node ./dist/server.js",
     "copy-templates": "copyfiles -u 1 src/mailtemplates/**/* dist/",
-    "build:backend": "tsc --pretty --strictNullChecks false",
+    "build:backend": "tsc --pretty",
     "build:frontend": "yarn --cwd ./frontend run build",
     "build:frontend:if-needed": "./scripts/build-frontend-if-needed.sh",
     "build": "yarn run clean && concurrently \"yarn:copy-templates\" \"yarn:build:frontend\" \"yarn:build:backend\"",
-    "dev:backend": "TZ=UTC NODE_ENV=development tsc-watch --strictNullChecks false --onSuccess \"node dist/server-dev.js\"",
+    "dev:backend": "TZ=UTC NODE_ENV=development tsc-watch --onSuccess \"node dist/server-dev.js\"",
     "dev:frontend": "wait-on tcp:4242 && yarn --cwd ./frontend run dev",
     "dev:frontend:cloud": "UNLEASH_BASE_PATH=/demo/ yarn run dev:frontend",
     "dev": "concurrently \"yarn:dev:backend\" \"yarn:dev:frontend\"",
     "prepare:backend": "concurrently \"yarn:copy-templates\" \"yarn:build:backend\"",
-    "start:dev": "yarn run clean && TZ=UTC NODE_ENV=development tsc-watch --strictNullChecks false --onSuccess \"node dist/server-dev.js\"",
+    "start:dev": "yarn run clean && TZ=UTC NODE_ENV=development tsc-watch --onSuccess \"node dist/server-dev.js\"",
     "db-migrate": "db-migrate --migrations-dir ./src/migrations",
     "lint": "biome check .",
     "lint:fix": "biome check . --write",
     "local:package": "del-cli --force build && mkdir build && cp -r dist docs CHANGELOG.md LICENSE README.md package.json build",
-    "build:watch": "yarn run clean && tsc -w --strictNullChecks false",
+    "build:watch": "tsc -w",
     "prepare": "husky && yarn --cwd ./frontend install && if [ ! -d ./dist ]; then yarn build; fi",
     "test": "NODE_ENV=test PORT=4243 node --trace-warnings node_modules/.bin/jest",
     "test:unit": "NODE_ENV=test PORT=4243 jest --testPathIgnorePatterns=src/test/e2e --testPathIgnorePatterns=dist",
@@ -60,7 +60,7 @@
     "test:coverage": "NODE_ENV=test PORT=4243 jest --coverage --testLocationInResults --outputFile=\"coverage/report.json\" --forceExit",
     "test:coverage:jest": "NODE_ENV=test PORT=4243 jest --silent --ci --json --coverage --testLocationInResults --outputFile=\"report.json\" --forceExit",
     "test:updateSnapshot": "NODE_ENV=test PORT=4243 jest --updateSnapshot",
-    "seed:setup": "ts-node --compilerOptions '{\"strictNullChecks\": false}' src/test/e2e/seed/segment.seed.ts",
+    "seed:setup": "ts-node src/test/e2e/seed/segment.seed.ts",
     "seed:serve": "UNLEASH_DATABASE_NAME=unleash_test UNLEASH_DATABASE_SCHEMA=seed yarn run start:dev",
     "clean": "del-cli --force dist",
     "heroku-postbuild": "cd frontend && yarn && yarn build",
@@ -220,7 +220,7 @@
     "supertest": "7.0.0",
     "ts-node": "10.9.2",
     "tsc-watch": "6.2.1",
-    "typescript": "5.4.5",
+    "typescript": "5.8.2",
     "wait-on": "^7.2.0"
   },
   "resolutions": {

src/lib/addons/datadog.ts

@@ -32,7 +32,7 @@ interface DDRequestBody {
 export default class DatadogAddon extends Addon {
     private msgFormatter: FeatureEventFormatter;
 
-    flagResolver: IFlagResolver;
+    declare flagResolver: IFlagResolver;
 
     constructor(config: IAddonConfig) {
         super(definition, config);