deepEquals.ts

deepEquals.ts

function deepEquals(v1: unknown, v2: unknown): boolean {
    if (v1 === v2) { return true } // equals

    const t1 = typeof v1
    const t2 = typeof v2

    if (t1 !== t2) { return false } // diff types
    if (t1 !== 'object') { return false }

    // objects or arrays

    const isArr1 = Array.isArray(v1)
    const isArr2 = Array.isArray(v2)

    if (isArr1 && isArr2) { // arrays
        if (v1.length !== v2.length) { return false }

        for (let i = 0; i < v1.length; ++i) {
            if (!deepEquals(v1[i], v2[i])) { return false }
        }

        return true
    } else if (isArr1 || isArr2) { // one is array, other is not
        return false
    } else { // objects
        if (Object.keys(v1 as O).length !== Object.keys(v2 as O).length) { return false }

        for (const k in v1 as O) {
            if (!deepEquals((v1 as O)[k], (v2 as O)[k])) { return false }
        }

        return true
    }
}

type O = Record<string, unknown>