feat(store): preserve the event name case with createActionGroup

Closes #3693

BREAKING CHANGES:

The event name case is preserved when converting to the action name by using the `createActionGroup` function.

BEFORE:

All letters of the event name will be lowercase, except for the initial letters of words starting from the second word, which will be uppercase.

```ts
const authApiActions = createActionGroup({
  source: 'Auth API',
  events: {
    'LogIn Success': emptyProps(),
    'login failure': emptyProps(),
    'Logout Success': emptyProps(),
    logoutFailure: emptyProps(),
  },
});

// generated actions:
const {
  loginSuccess,
  loginFailure,
  logoutSuccess,
  logoutfailure,
} = authApiActions;
```

AFTER:

The initial letter of the first word of the event name will be lowercase, and the initial letters of the other words will be uppercase. The case of other letters in the event name will remain the same.

```ts
const {
  logInSuccess,
  loginFailure,
  logoutSuccess,
  logoutFailure,
} = authApiActions;
```

modules/store/spec/action_group_creator.spec.ts

@@ -14,17 +14,22 @@ describe('createActionGroup', () => {
     source: 'Books API',
     events: {
       ' Load BOOKS  suCCess  ': emptyProps(),
+      loadBooksFailure: emptyProps(),
     },
   });
 
   it('should create action name by camel casing the event name', () => {
-    expect(booksApiActions.loadBooksSuccess).toBeDefined();
+    expect(booksApiActions.loadBOOKSSuCCess).toBeDefined();
+    expect(booksApiActions.loadBooksFailure).toBeDefined();
   });
 
   it('should create action type using the "[Source] Event" pattern', () => {
-    expect(booksApiActions.loadBooksSuccess().type).toBe(
+    expect(booksApiActions.loadBOOKSSuCCess().type).toBe(
       '[Books API]  Load BOOKS  suCCess  '
     );
+    expect(booksApiActions.loadBooksFailure().type).toBe(
+      '[Books API] loadBooksFailure'
+    );
   });
 
   it('should create action with props', () => {

modules/store/spec/helpers.spec.ts

@@ -1,4 +1,4 @@
-import { capitalize } from '../src/helpers';
+import { capitalize, uncapitalize } from '../src/helpers';
 
 describe('helpers', () => {
   describe('capitalize', () => {
@@ -10,4 +10,14 @@ describe('helpers', () => {
       expect(capitalize('')).toEqual('');
     });
   });
+
+  describe('uncapitalize', () => {
+    it('should uncapitalize the text', () => {
+      expect(uncapitalize('NGRX')).toEqual('nGRX');
+    });
+
+    it('should return an empty string when the text is an empty string', () => {
+      expect(uncapitalize('')).toEqual('');
+    });
+  });
 });

modules/store/spec/types/action_group_creator.spec.ts

@@ -98,22 +98,33 @@ describe('createActionGroup', () => {
 
     describe('event name', () => {
       it('should create action name by camel casing the event name', () => {
-        expectSnippet(`
+        const snippet = expectSnippet(`
           const booksApiActions = createActionGroup({
             source: 'Books API',
             events: {
               ' Load BOOKS  suCCess  ': emptyProps(),
+              loadBooksFailure: emptyProps(),
             },
           });
 
-          let loadBooksSuccess: typeof booksApiActions.loadBooksSuccess;
-        `).toInfer(
+          let loadBooksSuccess: typeof booksApiActions.loadBOOKSSuCCess;
+          let loadBooksFailure: typeof booksApiActions.loadBooksFailure;
+        `);
+
+        snippet.toInfer(
           'loadBooksSuccess',
           `ActionCreator<
             "[Books API]  Load BOOKS  suCCess  ",
             () => TypedAction<"[Books API]  Load BOOKS  suCCess  ">
           >`
         );
+        snippet.toInfer(
+          'loadBooksFailure',
+          `ActionCreator<
+            "[Books API] loadBooksFailure",
+            () => TypedAction<"[Books API] loadBooksFailure">
+          >`
+        );
       });
 
       it('should fail when event name is an empty string', () => {
@@ -222,7 +233,7 @@ describe('createActionGroup', () => {
           const booksApiActions = createActionGroup({
             source: 'Books API',
             events: {
-              '  Load BOOks  success ': emptyProps(),
+              '  Load Books  success ': emptyProps(),
               'load Books Success': props<{ books: string[] }>(),
             }
           });

modules/store/src/action_group_creator.ts

@@ -1,6 +1,6 @@
 import { createAction, props } from './action_creator';
 import { ActionCreatorProps, Creator } from './models';
-import { capitalize } from './helpers';
+import { capitalize, uncapitalize } from './helpers';
 import {
   ActionGroup,
   ActionGroupConfig,
@@ -75,9 +75,8 @@ function toActionName<EventName extends string>(
 ): ActionName<EventName> {
   return eventName
     .trim()
-    .toLowerCase()
     .split(' ')
-    .map((word, i) => (i === 0 ? word : capitalize(word)))
+    .map((word, i) => (i === 0 ? uncapitalize(word) : capitalize(word)))
     .join('') as ActionName<EventName>;
 }
 

modules/store/src/action_group_creator_models.ts

@@ -95,7 +95,7 @@ type EventCreator<
   : never;
 
 export type ActionName<EventName extends string> = Uncapitalize<
-  Join<TitleCase<Lowercase<Trim<EventName>>>>
+  Join<TitleCase<EventName>>
 >;
 
 export interface ActionGroupConfig<

modules/store/src/helpers.ts

@@ -1,3 +1,7 @@
 export function capitalize<T extends string>(text: T): Capitalize<T> {
   return (text.charAt(0).toUpperCase() + text.substring(1)) as Capitalize<T>;
 }
+
+export function uncapitalize<T extends string>(text: T): Uncapitalize<T> {
+  return (text.charAt(0).toLowerCase() + text.substring(1)) as Uncapitalize<T>;
+}