[Home](./index.md) > [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) > [ExpressionFunction](./kibana-plugin-plugins-expressions-server.expressionfunction.md) > [extract](./kibana-plugin-plugins-expressions-server.expressionfunction.extract.md) ## ExpressionFunction.extract property Signature: ```typescript extract: (state: ExpressionAstFunction['arguments']) => { state: ExpressionAstFunction['arguments']; references: SavedObjectReference[]; }; ```