rxdeep/dist/es6/trace.js

RxJS deep state management

function isRaw(v) {
    return v === null || v === undefined
        || typeof v === 'number' || typeof v === 'string' || typeof v === 'boolean'
        || v instanceof Date;
}
export function trace(src, dest) {
    if (src === dest) {
        return undefined;
    }
    if (!isRaw(src) && !isRaw(dest)) {
        const tr = { subs: {} };
        const seen = new Set();
        let changed = false;
        for (let key in src) {
            seen.add(key);
            const subTrace = trace(src[key], dest[key]);
            if (subTrace) {
                tr.subs[key] = subTrace;
                changed = true;
            }
        }
        for (let key in dest) {
            if (seen.has(key)) {
                continue;
            }
            tr.subs[key] = trace(src[key], dest[key]);
            changed = true;
        }
        if (changed) {
            return tr;
        }
        else {
            return undefined;
        }
    }
    if (src instanceof Date && dest instanceof Date && +src !== +dest) {
        return { from: src, to: dest };
    }
    /* istanbul ignore next */
    if (src !== dest) {
        return { from: src, to: dest };
    }
}
export function change(src, dest) {
    const _trace = trace(src, dest);
    if (_trace) {
        return {
            value: dest, trace: _trace
        };
    }
}
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