Resolve "Transition to ESLint"

src/routes/http-types.ts

@@ -14,10 +14,31 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 // the list provides option to easily implement "isHttpMethod" guard
-const httpVerbs = ['get', 'post', 'put', 'delete', 'patch', 'options',
-  'head', 'checkout', 'copy', 'lock', 'merge', 'mkactivity', 'mkcol',
-  'move', 'm-search', 'notify', 'purge', 'report', 'search', 'subscribe',
-  'trace', 'unlock','unsubscribe'] as const;
+const httpVerbs = [
+  'get',
+  'post',
+  'put',
+  'delete',
+  'patch',
+  'options',
+  'head',
+  'checkout',
+  'copy',
+  'lock',
+  'merge',
+  'mkactivity',
+  'mkcol',
+  'move',
+  'm-search',
+  'notify',
+  'purge',
+  'report',
+  'search',
+  'subscribe',
+  'trace',
+  'unlock',
+  'unsubscribe',
+] as const;
 /**
  * Strings that can be used as HTTP verbs (e.g. in requests): 'get' | 'post' | 'put' | 'delete' etc.
  */
@@ -29,5 +50,5 @@ export type HTTPVerb = typeof httpVerbs[number];
  * @param method A text (representing a method) to check
  */
 export function isHttpMethod(method: string): method is HTTPVerb {
-  return (httpVerbs as unknown as string[]).indexOf(method) > -1;
+  return (httpVerbs as unknown as string[]).includes(method);
 }