Use basicType helper in lib/database

Simplify the checking logic in lib/database by using the basicType
helper.

lib/database.js

@@ -8,6 +8,8 @@
 "use strict";
 const fs = require("fs-extra");
 
+const { basicType } = require("lib/helpers");
+
 
 /**
  * Converts a Map with only string keys to a JavaScript object.
@@ -46,16 +48,8 @@ async function loadJsonAsMap(filePath) {
 		let content = await fs.readFile(filePath);
 		let parsed = JSON.parse(content);
 
-		if (parsed instanceof Array) {
-			throw new Error(`Expected object but got array`);
-		}
-
-		if (parsed === null) {
-			throw new Error(`Expected object but got null`);
-		}
-
-		if (typeof parsed !== "object") {
-			throw new Error(`Expected object but got ${typeof parsed}`);
+		if (basicType(parsed) !== "object") {
+			throw new Error(`Expected object but got ${basicType(parsed)}`);
 		}
 
 		return new Map(Object.entries(parsed));
@@ -104,21 +98,13 @@ async function loadJsonArrayAsMap(filePath) {
 		let content = await fs.readFile(filePath);
 		let parsed = JSON.parse(content);
 
-		if (parsed === null) {
-			throw new Error(`Expected array but got null`);
-		}
-
-		if (typeof parsed !== "object") {
-			throw new Error(`Expected array but got ${typeof parsed}`);
-		}
-
-		if (!(parsed instanceof Array)) {
-			throw new Error(`Expected array but got object`);
+		if (basicType(parsed) !== "array") {
+			throw new Error(`Expected array but got ${basicType(parsed)}`);
 		}
 
 		let map = new Map();
 		for (let element of parsed) {
-			if (element === null || element instanceof Array || typeof element !== "object") {
+			if (basicType(element) !== "object") {
 				throw new Error(`Expected all elements to be objects`);
 			}