modernize backend to target the same ES and TS standards as the rest of the app

packages/backend/tsconfig.json

@@ -1,53 +1,10 @@
 {
-	"compilerOptions": {
-		"allowJs": true,
-		"noEmitOnError": true,
-		"noImplicitAny": true,
-		"noImplicitReturns": true,
-		"noUnusedParameters": false,
-		"noUnusedLocals": false,
-		"noFallthroughCasesInSwitch": true,
-		"declaration": false,
-		"sourceMap": false,
-		"target": "ES2022",
-		"module": "nodenext",
-		"moduleResolution": "nodenext",
-		"allowSyntheticDefaultImports": true,
-		"removeComments": false,
-		"noLib": false,
-		"strict": true,
-		"strictNullChecks": true,
-		"strictPropertyInitialization": false,
-		"skipLibCheck": true,
-		"experimentalDecorators": true,
-		"emitDecoratorMetadata": true,
-		"resolveJsonModule": true,
-		"isolatedModules": true,
-		"incremental": true,
-		"rootDir": "./src",
-		"baseUrl": "./",
-		"paths": {
-			"@/*": ["./src/*"]
-		},
-		"outDir": "./built",
-		"types": [
-			"node"
-		],
-		"typeRoots": [
-			"./src/@types",
-			"./node_modules/@types",
-			"./node_modules"
-		],
-		"lib": [
-			"esnext"
-		]
-	},
-	"compileOnSave": false,
-	"include": [
-		"./src/**/*.ts"
-	],
-	"exclude": [
-		"node_modules",
-		"./src/**/*.test.ts"
+	"$schema": "https://json.schemastore.org/tsconfig",
+	"files": [],
+	// WebStorm only reads one tsconfig per directory, so this tricks it into loading both.
+	"references": [
+		{ "path":  "./tsconfig.scripts.json" },
+		{ "path":  "./tsconfig.backend.json" },
+		{ "path":  "./jsconfig.frontend.json" }
 	]
 }