fix: reuse casing functionality from ensure in prompt

@commitlint/ensure/src/case.ts

@@ -5,9 +5,7 @@ import upperFirst from 'lodash/upperFirst';
 import startCase from 'lodash/startCase';
 import {TargetCaseType} from '@commitlint/types';
 
-export default ensureCase;
-
-function ensureCase(
+export default function ensureCase(
 	raw: string = '',
 	target: TargetCaseType = 'lowercase'
 ): boolean {
@@ -26,7 +24,10 @@ function ensureCase(
 	return transformed === input;
 }
 
-function toCase(input: string, target: TargetCaseType): string {
+/**
+ * @internal
+ */
+export function toCase(input: string, target: TargetCaseType): string {
 	switch (target) {
 		case 'camel-case':
 			return camelCase(input);

@commitlint/prompt/package.json

@@ -45,8 +45,8 @@
   "dependencies": {
     "@commitlint/load": "^11.0.0",
     "@commitlint/types": "^11.0.0",
+    "@commitlint/ensure": "^11.0.0",
     "chalk": "^4.0.0",
-    "lodash": "^4.17.19",
     "inquirer": "^6.5.2"
   },
   "gitHead": "cb565dfcca3128380b9b3dc274aedbcae34ce5ca"

@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 {RuleEntry} from './types';
 import {ruleIsActive, ruleIsNotApplicable} from './utils';
+import {toCase} from '@commitlint/ensure/lib/case';
+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);
 }

@commitlint/prompt/tsconfig.json

@@ -7,5 +7,9 @@
   },
   "include": ["./src"],
   "exclude": ["./src/**/*.test.ts", "./lib/**/*"],
-  "references": [{"path": "../types"}]
+  "references": [
+    {"path": "../types"},
+    {"path": "../load"},
+    {"path": "../ensure"}
+  ]
 }