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- {"ast":null,"code":"import * as uuid from \"uuid\";\nimport { Serializable, get_lc_unique_name } from \"../load/serializable.js\";\nimport { getEnvironmentVariable } from \"../utils/env.js\";\n/**\n * Abstract class that provides a set of optional methods that can be\n * overridden in derived classes to handle various events during the\n * execution of a LangChain application.\n */\nclass BaseCallbackHandlerMethodsClass {}\n/**\n * Abstract base class for creating callback handlers in the LangChain\n * framework. It provides a set of optional methods that can be overridden\n * in derived classes to handle various events during the execution of a\n * LangChain application.\n */\nexport class BaseCallbackHandler extends BaseCallbackHandlerMethodsClass {\n get lc_namespace() {\n return [\"langchain_core\", \"callbacks\", this.name];\n }\n get lc_secrets() {\n return undefined;\n }\n get lc_attributes() {\n return undefined;\n }\n get lc_aliases() {\n return undefined;\n }\n /**\n * The name of the serializable. 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