@redocly/openapi-core/src/js-yaml/index.ts

See https://github.com/Redocly/openapi-cli

// TODO: add a type for "types" https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/js-yaml/index.d.ts
// @ts-ignore
import { JSON_SCHEMA, types, LoadOptions, DumpOptions, load, dump  } from 'js-yaml';

const DEFAULT_SCHEMA_WITHOUT_TIMESTAMP = JSON_SCHEMA.extend({
  implicit: [types.merge],
  explicit: [
    types.binary,
    types.omap,
    types.pairs,
    types.set,
  ],
});

export const parseYaml = (str: string, opts?: LoadOptions): unknown =>
  load(str, {schema: DEFAULT_SCHEMA_WITHOUT_TIMESTAMP, ...opts});

export const stringifyYaml = (obj: any, opts?: DumpOptions): string => dump(obj, opts);