setDepthIfLower(module, depth) {
		const mgm = this._getModuleGraphModule(module);
		if (mgm.depth === null || mgm.depth > depth) {
			mgm.depth = depth;
			return true;
		}
		return false;
	}
@param {Module} module the module
@param {number} depth the depth of the module
@returns {boolean} true, if the depth was set