fix(editor): Add smart decimals directive (#14054)

packages/@n8n/utils/src/number/smartDecimal.test.ts

@@ -0,0 +1,35 @@
+import { smartDecimal } from './smartDecimal';
+
+describe('smartDecimal', () => {
+	it('should return the same value if it is an integer', () => {
+		expect(smartDecimal(42)).toBe(42);
+	});
+
+	it('should return the same value if it has only one decimal place', () => {
+		expect(smartDecimal(42.5)).toBe(42.5);
+	});
+
+	it('should round to two decimal places by default', () => {
+		expect(smartDecimal(42.567)).toBe(42.57);
+	});
+
+	it('should round to the specified number of decimal places', () => {
+		expect(smartDecimal(42.567, 1)).toBe(42.6);
+	});
+
+	it('should handle negative numbers correctly', () => {
+		expect(smartDecimal(-42.567, 2)).toBe(-42.57);
+	});
+
+	it('should handle zero correctly', () => {
+		expect(smartDecimal(0)).toBe(0);
+	});
+
+	it('should handle very small numbers correctly', () => {
+		expect(smartDecimal(0.000567, 5)).toBe(0.00057);
+	});
+
+	it('should round to two decimal if it is smaller than the given one', () => {
+		expect(smartDecimal(42.56, 3)).toBe(42.56);
+	});
+});

packages/@n8n/utils/src/number/smartDecimal.ts

@@ -0,0 +1,13 @@
+export const smartDecimal = (value: number, decimals = 2): number => {
+	// Check if integer
+	if (Number.isInteger(value)) {
+		return value;
+	}
+
+	// Check if it has only one decimal place
+	if (value.toString().split('.')[1].length <= decimals) {
+		return value;
+	}
+
+	return Number(value.toFixed(decimals));
+};