handle singular and plural slugs for auto-label

src/utilities/formatLabels.spec.ts

@@ -1,29 +1,29 @@
 import formatLabels from './formatLabels';
 
 describe('formatLabels', () => {
-  it('should format single word', () => {
+  it('should format singular slug', () => {
     expect(formatLabels('word')).toMatchObject({
       singular: 'Word',
       plural: 'Words',
     });
   });
 
-  it('should format already plural', () => {
+  it('should format plural slug', () => {
     expect(formatLabels('words')).toMatchObject({
-      singular: 'Words',
+      singular: 'Word',
       plural: 'Words',
     });
   });
 
   it('should format kebab case', () => {
-    expect(formatLabels('kebab-item')).toMatchObject({
-      singular: 'Kebab Item',
-      plural: 'Kebab Items',
+    expect(formatLabels('my-slugs')).toMatchObject({
+      singular: 'My Slug',
+      plural: 'My Slugs',
     });
   });
 
   it('should format camelCase', () => {
-    expect(formatLabels('camelCaseItem')).toMatchObject({
+    expect(formatLabels('camelCaseItems')).toMatchObject({
       singular: 'Camel Case Item',
       plural: 'Camel Case Items',
     });

src/utilities/formatLabels.ts

@@ -1,8 +1,8 @@
-import pluralize from 'pluralize';
+import pluralize, { isPlural, singular } from 'pluralize';
 
-const capitalizeFirstLetter = (string) => string.charAt(0).toUpperCase() + string.slice(1);
+const capitalizeFirstLetter = (string: string) => string.charAt(0).toUpperCase() + string.slice(1);
 
-const toWords = (inputString) => {
+const toWords = (inputString: string): string => {
   const notNullString = inputString || '';
   const trimmedString = notNullString.trim();
   const arrayOfStrings = trimmedString.split(/[\s-]/);
@@ -18,12 +18,17 @@ const toWords = (inputString) => {
   return splitStringsArray.join(' ');
 };
 
-const formatLabels = ((input) => {
-  const words = toWords(input);
-  return {
-    singular: words,
-    plural: pluralize(words),
-  };
+const formatLabels = ((slug: string): { singular: string, plural: string} => {
+  const words = toWords(slug);
+  return (isPlural(slug))
+    ? {
+      singular: singular(words),
+      plural: words,
+    }
+    : {
+      singular: words,
+      plural: pluralize(words),
+    };
 });
 
 export default formatLabels;