fix(Compare Datasets Node): UI tweaks and fixes

packages/nodes-base/utils/utilities.ts

@@ -1,6 +1,7 @@
-import { IDisplayOptions, INodeProperties } from 'n8n-workflow';
+import type { IDataObject, IDisplayOptions, INodeProperties } from 'n8n-workflow';
+import { jsonParse } from 'n8n-workflow';
 
-import { merge } from 'lodash';
+import { isEqual, isNull, merge } from 'lodash';
 
 /**
  * Creates an array of elements split into groups the length of `size`.
@@ -71,3 +72,103 @@ export function updateDisplayOptions(
 		};
 	});
 }
+
+function isFalsy<T>(value: T) {
+	if (isNull(value)) return true;
+	if (typeof value === 'string' && value === '') return true;
+	if (Array.isArray(value) && value.length === 0) return true;
+	return false;
+}
+
+const parseStringAndCompareToObject = (str: string, arr: IDataObject) => {
+	try {
+		const parsedArray = jsonParse(str);
+		return isEqual(parsedArray, arr);
+	} catch (error) {
+		return false;
+	}
+};
+
+export const fuzzyCompare = (useFuzzyCompare: boolean, compareVersion = 1) => {
+	if (!useFuzzyCompare) {
+		//Fuzzy compare is false we do strict comparison
+		return <T, U>(item1: T, item2: U) => isEqual(item1, item2);
+	}
+
+	return <T, U>(item1: T, item2: U) => {
+		//Both types are the same, so we do strict comparison
+		if (!isNull(item1) && !isNull(item2) && typeof item1 === typeof item2) {
+			return isEqual(item1, item2);
+		}
+
+		if (compareVersion >= 2) {
+			//Null, 0 and "0" treated as equal
+			if (isNull(item1) && (isNull(item2) || item2 === 0 || item2 === '0')) {
+				return true;
+			}
+
+			if (isNull(item2) && (isNull(item1) || item1 === 0 || item1 === '0')) {
+				return true;
+			}
+		}
+
+		//Null, empty strings, empty arrays all treated as the same
+		if (isFalsy(item1) && isFalsy(item2)) return true;
+
+		//When a field is missing in one branch and isFalsy() in another, treat them as matching
+		if (isFalsy(item1) && item2 === undefined) return true;
+		if (item1 === undefined && isFalsy(item2)) return true;
+
+		//Compare numbers and strings representing that number
+		if (typeof item1 === 'number' && typeof item2 === 'string') {
+			return item1.toString() === item2;
+		}
+
+		if (typeof item1 === 'string' && typeof item2 === 'number') {
+			return item1 === item2.toString();
+		}
+
+		//Compare objects/arrays and their stringified version
+		if (!isNull(item1) && typeof item1 === 'object' && typeof item2 === 'string') {
+			return parseStringAndCompareToObject(item2, item1 as IDataObject);
+		}
+
+		if (!isNull(item2) && typeof item1 === 'string' && typeof item2 === 'object') {
+			return parseStringAndCompareToObject(item1, item2 as IDataObject);
+		}
+
+		//Compare booleans and strings representing the boolean (’true’, ‘True’, ‘TRUE’)
+		if (typeof item1 === 'boolean' && typeof item2 === 'string') {
+			if (item1 === true && item2.toLocaleLowerCase() === 'true') return true;
+			if (item1 === false && item2.toLocaleLowerCase() === 'false') return true;
+		}
+
+		if (typeof item2 === 'boolean' && typeof item1 === 'string') {
+			if (item2 === true && item1.toLocaleLowerCase() === 'true') return true;
+			if (item2 === false && item1.toLocaleLowerCase() === 'false') return true;
+		}
+
+		//Compare booleans and the numbers/string 0 and 1
+		if (typeof item1 === 'boolean' && typeof item2 === 'number') {
+			if (item1 === true && item2 === 1) return true;
+			if (item1 === false && item2 === 0) return true;
+		}
+
+		if (typeof item2 === 'boolean' && typeof item1 === 'number') {
+			if (item2 === true && item1 === 1) return true;
+			if (item2 === false && item1 === 0) return true;
+		}
+
+		if (typeof item1 === 'boolean' && typeof item2 === 'string') {
+			if (item1 === true && item2 === '1') return true;
+			if (item1 === false && item2 === '0') return true;
+		}
+
+		if (typeof item2 === 'boolean' && typeof item1 === 'string') {
+			if (item2 === true && item1 === '1') return true;
+			if (item2 === false && item1 === '0') return true;
+		}
+
+		return isEqual(item1, item2);
+	};
+};