Added function to parse optional boolean to string

src/utils/utils.ts

@@ -30,3 +30,7 @@ export const equals = (value: any) => (otherValue: any) => value === otherValue;
 export type BooleanString = 'true' | 'false';
 
 export const parseBooleanToString = (value: boolean): BooleanString => (value ? 'true' : 'false');
+
+export const parseOptionalBooleanToString = (value?: boolean): BooleanString | undefined => (
+  value === undefined ? undefined : parseBooleanToString(value)
+);

test/utils/utils.test.ts

@@ -1,4 +1,10 @@
-import { capitalize, nonEmptyValueOrNull, parseBooleanToString, rangeOf } from '../../src/utils/utils';
+import {
+  capitalize,
+  nonEmptyValueOrNull,
+  parseBooleanToString,
+  parseOptionalBooleanToString,
+  rangeOf,
+} from '../../src/utils/utils';
 
 describe('utils', () => {
   describe('rangeOf', () => {
@@ -58,4 +64,14 @@ describe('utils', () => {
       expect(parseBooleanToString(value)).toEqual(expectedResult);
     });
   });
+
+  describe('parseOptionalBooleanToString', () => {
+    it.each([
+      [undefined, undefined],
+      [true, 'true'],
+      [false, 'false'],
+    ])('parses value as expected', (value, expectedResult) => {
+      expect(parseOptionalBooleanToString(value)).toEqual(expectedResult);
+    });
+  });
 });