extensions/typescript-language-features/src/utils/resourceMap.ts/ResourceMap/set
class ResourceMap:	public set(resource: vscode.Uri, value: T) {
		const file = this.toKey(resource);
		if (!file) {
			return;
		}
		const entry = this._map.get(file);
		if (entry) {
			entry.value = value;
		} else {
			this._map.set(file, { resource, value });
		}
	}