feat: code improvements

Author: DmitryAnansky

packages/core/src/format/codeframes.ts

@@ -176,7 +176,7 @@ function positionsToLoc(
 }
 
 export function getAstNodeByPointer(root: YAMLNode, pointer: string, reportOnKey: boolean) {
-  const [, ...pointerSegments] = parsePointer(pointer);
+  const pointerSegments = parsePointer(pointer).slice(1);
   if (root === undefined) {
     return undefined;
   }

packages/core/src/ref-utils.ts

@@ -50,7 +50,7 @@ export function unescapePointerFromURI(fragment: string): string {
 
 export function escapePointer<T extends string | number>(fragment: T): T {
   if (typeof fragment === 'number') return fragment;
-  return (fragment as string).replace(/~/g, '~0').replace(/\//g, '~1') as T;
+  return fragment.replace(/~/g, '~0').replace(/\//g, '~1') as T;
 }
 
 export function parseRef(ref: string): { uri: string | null; pointer: string[] } {