feat: add camelize and underscore exports to @interweb/inflection

Author: pyramation

packages/inflection/__tests__/inflection.test.ts

@@ -7,6 +7,8 @@ import {
   distinctPluralizeLast,
   lcFirst,
   ucFirst,
+  camelize,
+  underscore,
   fixCapitalisedPlural,
   toFieldName,
   toQueryName,
@@ -126,6 +128,43 @@ describe('ucFirst', () => {
   });
 });
 
+describe('camelize', () => {
+  it('should convert snake_case to PascalCase by default', () => {
+    expect(camelize('user_profile')).toBe('UserProfile');
+    expect(camelize('order_item')).toBe('OrderItem');
+    expect(camelize('api_schema')).toBe('ApiSchema');
+  });
+
+  it('should convert snake_case to camelCase when lowFirstLetter is true', () => {
+    expect(camelize('user_profile', true)).toBe('userProfile');
+    expect(camelize('order_item', true)).toBe('orderItem');
+    expect(camelize('api_schema', true)).toBe('apiSchema');
+  });
+
+  it('should handle single words', () => {
+    expect(camelize('user')).toBe('User');
+    expect(camelize('user', true)).toBe('user');
+  });
+});
+
+describe('underscore', () => {
+  it('should convert PascalCase to snake_case', () => {
+    expect(underscore('UserProfile')).toBe('user_profile');
+    expect(underscore('OrderItem')).toBe('order_item');
+    expect(underscore('ApiSchema')).toBe('api_schema');
+  });
+
+  it('should convert camelCase to snake_case', () => {
+    expect(underscore('userProfile')).toBe('user_profile');
+    expect(underscore('orderItem')).toBe('order_item');
+  });
+
+  it('should handle single words', () => {
+    expect(underscore('User')).toBe('user');
+    expect(underscore('user')).toBe('user');
+  });
+});
+
 describe('fixCapitalisedPlural', () => {
   it('should fix capitalized S after numbers', () => {
     expect(fixCapitalisedPlural('Table1S')).toBe('Table1s');

packages/inflection/src/case.ts

@@ -1,6 +1,7 @@
 /**
  * Case transformation utilities
  */
+import * as inflection from 'inflection';
 
 /**
  * Convert PascalCase to camelCase (lowercase first character)
@@ -10,6 +11,25 @@ export function lcFirst(str: string): string {
   return str.charAt(0).toLowerCase() + str.slice(1);
 }
 
+/**
+ * Convert a string to camelCase
+ * @param str - The string to convert
+ * @param lowFirstLetter - If true, the first letter will be lowercase (default: false)
+ * @example camelize("user_profile") -> "UserProfile"
+ * @example camelize("user_profile", true) -> "userProfile"
+ */
+export function camelize(str: string, lowFirstLetter?: boolean): string {
+  return inflection.camelize(str, lowFirstLetter);
+}
+
+/**
+ * Convert a camelCase or PascalCase string to snake_case
+ * @example underscore("UserProfile") -> "user_profile"
+ */
+export function underscore(str: string): string {
+  return inflection.underscore(str);
+}
+
 /**
  * Convert camelCase to PascalCase (uppercase first character)
  * @example "userProfile" -> "UserProfile"