refactor(prompt): remove duplication in case conversion

The @commitlint/prompt package was previously duplicating the case conversion logic also found in
the @commitlint/ensure package.

Author: hasghari

@commitlint/prompt/package.json

@@ -41,10 +41,10 @@
     "commitizen": "4.2.4"
   },
   "dependencies": {
+    "@commitlint/ensure": "^14.0.0",
     "@commitlint/load": "^14.0.0",
     "@commitlint/types": "^14.0.0",
     "chalk": "^4.0.0",
-    "lodash": "^4.17.19",
     "throat": "^6.0.0",
     "vorpal": "^1.12.0"
   },

@commitlint/prompt/src/library/get-forced-case-fn.test.ts

@@ -32,13 +32,14 @@ test('should not apply', () => {
 });
 
 test('should throw error on invalid casing', () => {
-	expect(() =>
-		getForcedCaseFn(['name', [RuleConfigSeverity.Warning, 'always']])
-	).toThrow('Unknown target case "undefined"');
+	let rule = getForcedCaseFn(['name', [RuleConfigSeverity.Warning, 'always']]);
+	expect(() => rule('test')).toThrow('Unknown target case "undefined"');
 
-	expect(() =>
-		getForcedCaseFn(['name', [RuleConfigSeverity.Warning, 'always', 'foo']])
-	).toThrow('Unknown target case "foo"');
+	rule = getForcedCaseFn([
+		'name',
+		[RuleConfigSeverity.Warning, 'always', 'foo'],
+	]);
+	expect(() => rule('test')).toThrow('Unknown target case "foo"');
 });
 
 test('should convert text correctly', () => {
@@ -88,13 +89,13 @@ test('should convert text correctly', () => {
 		'name',
 		[RuleConfigSeverity.Warning, 'always', 'sentence-case'],
 	]);
-	expect(rule('TEST_FOOBar-baz baz')).toBe('Test_foobar-baz baz');
+	expect(rule('TEST_FOOBar-baz baz')).toBe('TEST_FOOBar-baz baz');
 
 	rule = getForcedCaseFn([
 		'name',
 		[RuleConfigSeverity.Warning, 'always', 'sentencecase'],
 	]);
-	expect(rule('TEST_FOOBar-baz baz')).toBe('Test_foobar-baz baz');
+	expect(rule('TEST_FOOBar-baz baz')).toBe('TEST_FOOBar-baz baz');
 
 	rule = getForcedCaseFn([
 		'name',

@commitlint/prompt/src/library/get-forced-case-fn.ts

@@ -1,10 +1,7 @@
-import camelCase from 'lodash/camelCase';
-import kebabCase from 'lodash/kebabCase';
-import snakeCase from 'lodash/snakeCase';
-import upperFirst from 'lodash/upperFirst';
-import startCase from 'lodash/startCase';
+import {toCase} from '@commitlint/ensure';
 import {RuleEntry} from './types';
 import {ruleIsActive, ruleIsNotApplicable} from './utils';
+import {TargetCaseType} from '@commitlint/types';
 
 /**
  * Get forced case for rule
@@ -26,29 +23,5 @@ export default function getForcedCaseFn(
 		return noop;
 	}
 
-	switch (target) {
-		case 'camel-case':
-			return (input: string) => camelCase(input);
-		case 'kebab-case':
-			return (input: string) => kebabCase(input);
-		case 'snake-case':
-			return (input: string) => snakeCase(input);
-		case 'pascal-case':
-			return (input: string) => upperFirst(camelCase(input));
-		case 'start-case':
-			return (input: string) => startCase(input);
-		case 'upper-case':
-		case 'uppercase':
-			return (input: string) => input.toUpperCase();
-		case 'sentence-case':
-		case 'sentencecase':
-			return (input: string) =>
-				`${input.charAt(0).toUpperCase()}${input.substring(1).toLowerCase()}`;
-		case 'lower-case':
-		case 'lowercase':
-		case 'lowerCase': // Backwards compat config-angular v4
-			return (input: string) => input.toLowerCase();
-		default:
-			throw new TypeError(`Unknown target case "${target}"`);
-	}
+	return (input: string) => toCase(input, target as TargetCaseType);
 }