tsconfig.json

// prettier-ignore
{
	"compilerOptions": {
		"downlevelIteration": true, // Added

		// Added
		//
		/* Strict Type-Checking Options */
		"strict": true,                        /* Enable all strict type-checking options. */
		"noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
		"strictNullChecks": true,              /* Enable strict null checks. */
		"strictFunctionTypes": true,           /* Enable strict checking of function types. */
		"strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
		"strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
		"noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
		"alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */

		// Added
		//
		/* Additional Checks */
		"noUnusedLocals": true,                /* Report errors on unused locals. */
		"noUnusedParameters": true,            /* Report errors on unused parameters. */
		"noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
		"noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */


		"target": "es5",
		"lib": [
			"dom",
			"dom.iterable",
			"esnext"
		],
		"allowJs": true,
		"skipLibCheck": true,
		// "strict": false,
		"forceConsistentCasingInFileNames": true,
		"noEmit": true,
		"esModuleInterop": true,
		"module": "commonjs", // Changed (from `"esnext"`).
		"moduleResolution": "node",
		"resolveJsonModule": true,
		"isolatedModules": true,
		"jsx": "preserve"
	},
	"include": [
		"next-env.d.ts",
		"**/*.ts",
		"**/*.tsx"
	],
	"exclude": [
		"node_modules"
	]
}