kibana/docs/development/plugins/expressions/server/kibana-plugin-plugins-expressions-server.expressionastfunctionbuilder.getargument.md

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ExpressionAstFunctionBuilder.getArgument property

Retrieves an existing argument by name. Useful when you want to retrieve the current array of args and add something to it before calling replaceArgument. Any subexpression arguments will be returned as expression builder instances.

Signature:

getArgument: <A extends FunctionArgName<FnDef>>(name: A) => Array<FunctionArgs<FnDef>[A] | ExpressionAstExpressionBuilder> | undefined;