src/vs/platform/instantiation/common/graph.ts/Graph/toString
class Graph:	toString(): string {
		const data: string[] = [];
		for (const [key, value] of this._nodes) {
			data.push(`${key}, (incoming)[${[...value.incoming.keys()].join(', ')}], (outgoing)[${[...value.outgoing.keys()].join(',')}]`);

		}
		return data.join('\n');
	}