rxdeep/dist/es6/reverse.js

RxJS deep state management

import { isLeaf } from './types/changes';
function clean(l) {
    if (l[l.length - 1] === undefined) {
        l.length--;
        clean(l);
    }
}
export function reverse(change) {
    if (isLeaf(change.trace)) {
        return {
            value: change.trace.from,
            trace: {
                from: change.trace.to,
                to: change.trace.from,
            }
        };
    }
    else {
        const revalue = Array.isArray(change.value) ? [...change.value] : Object.assign({}, change.value);
        const retrace = {
            subs: {}
        };
        for (let key in change.trace.subs) {
            const reversed = reverse({
                value: change.value ? change.value[key] : undefined,
                trace: change.trace.subs[key],
            });
            revalue[key] = reversed.value;
            retrace.subs[key] = reversed.trace;
        }
        if (Array.isArray(revalue)) {
            clean(revalue);
        }
        return {
            value: revalue,
            trace: retrace,
        };
    }
}
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