@formily/reactive/esm/observe.js

> Web Reactive Library Like Mobx

import { ObserverListeners } from './environment';
import { raw as getRaw } from './externals';
import { isFn } from './checkers';
import { DataChange, getDataNode } from './tree';
export var observe = function (target, observer, deep) {
    if (deep === void 0) { deep = true; }
    var addListener = function (target) {
        var raw = getRaw(target);
        var node = getDataNode(raw);
        var listener = function (operation) {
            var targetRaw = getRaw(operation.target);
            var targetNode = getDataNode(targetRaw);
            if (deep) {
                if (node.contains(targetNode)) {
                    observer(new DataChange(operation, targetNode));
                    return;
                }
            }
            if (node === targetNode ||
                (node.targetRaw === targetRaw && node.key === operation.key)) {
                observer(new DataChange(operation, targetNode));
            }
        };
        if (node && isFn(observer)) {
            ObserverListeners.add(listener);
        }
        return function () {
            ObserverListeners.delete(listener);
        };
    };
    if (target && typeof target !== 'object')
        throw Error("Can not observe ".concat(typeof target, " type."));
    return addListener(target);
};
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