chore(utils): ts-migration of utils/slugs (#44921)

* chore: utils is added in the tsconfig

* test(util): test and test function is updated to typescript

* chore: add tsconfig for utils

* fix: exclude files importing from client/

* fix: refactor to just export functions

* chore: add emitted files to prettierignore

* fix: add new tsconfig to eslint project

Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>
Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

utils/slugs.test.ts

@@ -0,0 +1,49 @@
+import { dasherize, nameify, unDasherize } from './slugs';
+
+describe('dasherize', () => {
+  it('returns a string', () => {
+    expect(dasherize('')).toBe('');
+  });
+  it('converts characters to lower case', () => {
+    expect(dasherize('UPPERCASE')).toBe('uppercase');
+  });
+  it('converts spaces to dashes', () => {
+    expect(dasherize('the space  between')).toBe('the-space--between');
+  });
+
+  it('converts dots to dashes', () => {
+    expect(dasherize('the..dots.. between')).toBe('the--dots---between');
+  });
+
+  it('trims off surrounding whitespace', () => {
+    expect(dasherize('  the space  between    ')).toBe('the-space--between');
+  });
+
+  it('removes everything except letters, numbers and -', () => {
+    expect(dasherize('1a!"£$%^*()_+=-.b2')).toBe('1a--b2');
+  });
+});
+
+describe('nameify', () => {
+  it('returns a string', () => {
+    expect(nameify('')).toBe('');
+  });
+  it('removes everything except letters, numbers and spaces', () => {
+    expect(nameify('1A !"£$%^*()_+=-.b  2')).toBe('1A b  2');
+  });
+});
+
+describe('unDasherize', () => {
+  it('returns a string', () => {
+    expect(unDasherize('')).toBe('');
+  });
+  it('converts dashes to spaces', () => {
+    expect(unDasherize('the-space--between')).toBe('the space  between');
+  });
+  it('removes everything except letters, numbers and spaces', () => {
+    expect(unDasherize('1A !"£$%^*()_+=-.b  2')).toBe('1A  b  2');
+  });
+  it('trims off surrounding whitespace', () => {
+    expect(unDasherize('--the-space--between----')).toBe('the space  between');
+  });
+});