@fellow/prosemirror-recreate-transform/src/getFromPath.ts

Create a set of steps transforming one prosemirror json document to another

import { JSONValue } from "./types";

/**
 * get target value from json-pointer (e.g. /content/0/content)
 * @param  {AnyObject} obj  object to resolve path into
 * @param  {string}    path json-pointer
 * @return {any} target value
 */
export function getFromPath(obj: JSONValue, path: string): JSONValue {
    const pathParts = path.split("/");
    pathParts.shift(); // remove root-entry
    while (pathParts.length) {
        if (typeof obj != "object") {
            throw new Error();
        }
        const property = pathParts.shift() as string;
        // @ts-expect-error property is a string but obj may be an array
        obj = obj[property];
    }
    return obj;
}