just-animate/lib.es2015/lib/reducers/append.js

_Making Animation Simple_

import { _ } from '../utils/constants';
import { isDefined } from '../utils/inspect';
import { list } from '../utils/lists';
import { insert } from './insert';
export const append = (model, data, ctx) => {
    const cursor = model.cursor;
    const opts2 = list(data).map(opt => {
        const { to, from, duration } = opt;
        const hasTo = isDefined(to);
        const hasFrom = isDefined(from);
        const hasDuration = isDefined(duration);
        const opt2 = opt;
        opt2.to =
            hasTo && (hasFrom || hasDuration)
                ? to
                : hasDuration && hasFrom
                    ? from + duration
                    : hasTo && !hasDuration
                        ? cursor + to
                        : hasDuration
                            ? cursor + duration
                            : _;
        opt2.from =
            hasFrom && (hasTo || hasDuration)
                ? from
                : hasTo && hasDuration
                    ? to - duration
                    : hasTo || hasDuration
                        ? cursor
                        : _;
        return opt2;
    });
    insert(model, opts2, ctx);
};