openapi-typescript-codegen/src/utils/isEqual.ts

export const isEqual = (a: any, b: any): boolean => {
    if (a === b) {
        return true;
    }

    if (a && b && typeof a === 'object' && typeof b === 'object') {
        if (Array.isArray(a) && Array.isArray(b)) {
            if (a.length !== b.length) {
                return false;
            }
            for (let i = 0; i < a.length; i++) {
                if (!isEqual(a[i], b[i])) {
                    return false;
                }
            }
            return true;
        }

        const keysA = Object.keys(a);
        const keysB = Object.keys(b);
        if (keysA.length !== keysB.length) {
            return false;
        }

        for (let i = 0; i < keysA.length; i++) {
            const key = keysA[i];
            if (!Object.prototype.hasOwnProperty.call(b, key)) {
                return false;
            }
            if (!isEqual(a[key], b[key])) {
                return false;
            }
        }
        return true;
    }

    return a !== a && b !== b;
};