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(`${key}\n\t(-> incoming)[${[...value.incoming.keys()].join(', ')}]\n\t(outgoing ->)[${[...value.outgoing.keys()].join(',')}]\n`);

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