@squiz/json-schema-library/lib/utils/deepCompare.ts

Customizable and hackable json-validator and json-schema utilities for traversal, data generation and validation

/**
 * deep comparison of javascript types. Better handling than using
 * JSON.stringify, where property order is accounted for
 *
 * @returns true, if data types are deep equal
 */
export default function deepCompareStrict(a: any, b: any): boolean {
    const typeofa = typeof a;
    if (typeofa !== typeof b) {
        return false;
    }
    if (Array.isArray(a)) {
        if (!Array.isArray(b)) {
            return false;
        }
        const length = a.length;
        if (length !== b.length) {
            return false;
        }
        for (let i = 0; i < length; i++) {
            if (!deepCompareStrict(a[i], b[i])) {
                return false;
            }
        }
        return true;
    }
    if (typeofa === "object") {
        if (!a || !b) {
            return a === b;
        }
        const aKeys = Object.keys(a);
        const bKeys = Object.keys(b);
        const length = aKeys.length;
        if (length !== bKeys.length) {
            return false;
        }
        for (const k of aKeys) {
            if (!deepCompareStrict(a[k], b[k])) {
                return false;
            }
        }
        return true;
    }
    return a === b;
}