@redocly/openapi-core/lib/utils/dequal.js

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

/**
 * Checks if two objects are deeply equal.
 * Borrowed the source code from https://github.com/lukeed/dequal.
 */
export function dequal(foo, bar) {
    let ctor, len;
    if (foo === bar)
        return true;
    if (foo && bar && (ctor = foo.constructor) === bar.constructor) {
        if (ctor === Date)
            return foo.getTime() === bar.getTime();
        if (ctor === RegExp)
            return foo.toString() === bar.toString();
        if (ctor === Array) {
            if ((len = foo.length) === bar.length) {
                while (len-- && dequal(foo[len], bar[len]))
                    ;
            }
            return len === -1;
        }
        if (!ctor || typeof foo === 'object') {
            len = 0;
            for (ctor in foo) {
                if (Object.prototype.hasOwnProperty.call(foo, ctor) &&
                    ++len &&
                    !Object.prototype.hasOwnProperty.call(bar, ctor))
                    return false;
                if (!(ctor in bar) || !dequal(foo[ctor], bar[ctor]))
                    return false;
            }
            return Object.keys(bar).length === len;
        }
    }
    return foo !== foo && bar !== bar;
}
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