@visactor/vrender-core/es/registry/contribution-registry.js

```typescript import { xxx } from '@visactor/vrender-core'; ```

export class ContributionRegistry {
    constructor() {
        this.entries = new Map;
    }
    register(key, contribution) {
        var _a;
        const current = null !== (_a = this.entries.get(key)) && void 0 !== _a ? _a : [];
        current.push(contribution), this.entries.set(key, current);
    }
    unregister(key, contribution) {
        if (void 0 === contribution) return void this.entries.delete(key);
        const current = this.entries.get(key);
        if (!current) return;
        const next = current.filter((entry => entry !== contribution));
        next.length ? this.entries.set(key, next) : this.entries.delete(key);
    }
    get(key) {
        var _a;
        return [ ...null !== (_a = this.entries.get(key)) && void 0 !== _a ? _a : [] ];
    }
    getAll() {
        return Array.from(this.entries.values()).reduce(((all, current) => (all.push(...current), 
        all)), []);
    }
    clear(key) {
        null != key ? this.entries.delete(key) : this.entries.clear();
    }
}
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