@qn-pandora/pandora-visualization/es/utils/reactionWithOldValue.js

Pandora 通用可视化库

var __rest = (this && this.__rest) || function (s, e) {
    var t = {};
    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
        t[p] = s[p];
    if (s != null && typeof Object.getOwnPropertySymbols === "function")
        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
                t[p[i]] = s[p[i]];
        }
    return t;
};
import { reaction } from 'mobx';
import { isEqual } from 'lodash';
export var reactionWithOldValue = function (expression, effect, opts) {
    var oldValue;
    var isFirst = true;
    var _a = opts || {}, ignoreFirst = _a.ignoreFirst, otherOpts = __rest(_a, ["ignoreFirst"]);
    return reaction(expression, function (v) {
        if (ignoreFirst && isFirst) {
            oldValue = v;
            isFirst = false;
            return;
        }
        if (!isEqual(v, oldValue)) {
            effect(v, oldValue);
        }
        oldValue = v;
        isFirst = false;
    }, otherOpts);
};