proxy-state-tree/es/TrackStateTree.js

An implementation of the Mobx/Vue state tracking approach, for library authors

export class TrackStateTree {
    disposeOnReset;
    root;
    pathDependencies = new Set();
    state;
    proxifier;
    trackPathListeners = [];
    constructor(root) {
        this.root = root;
        this.proxifier = root.proxifier;
        this.state = root.state;
    }
    trackPaths() {
        const paths = new Set();
        const listener = (path) => {
            paths.add(path);
        };
        this.trackPathListeners.push(listener);
        return () => {
            this.trackPathListeners.splice(this.trackPathListeners.indexOf(listener), 1);
            return paths;
        };
    }
    track() {
        this.root.setTrackStateTree(this);
        return this;
    }
    canMutate() {
        return false;
    }
    canTrack() {
        return true;
    }
    addTrackingPath(path) {
        this.pathDependencies.add(path);
    }
    subscribe(cb) {
        this.root.unsetTrackStateTree(this);
        for (const path of this.pathDependencies) {
            this.root.addPathDependency(path, cb);
        }
        return () => {
            for (const path of this.pathDependencies) {
                this.root.removePathDependency(path, cb);
            }
        };
    }
    trackScope(scope) {
        const previousPreviousTree = this.root.previousTree;
        const previousCurrentTree = this.root.currentTree;
        this.root.currentTree = this;
        this.track();
        scope(this);
        this.root.currentTree = previousCurrentTree;
        this.root.previousTree = previousPreviousTree;
        return this;
    }
}
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