Method oldestPoint

src/grapher/datasource.ts:77–79

(graphId: string)

    }

    public oldestPoint(graphId: string): GraphPoint {
        return this.data[graphId] ? this.data[graphId][0] : null;
    }

    public subscribe(graphId: string, callback: (point: GraphPoint) => void) {
        if (!this.subscriptions[graphId]) { this.subscriptions[graphId] = []; }