kibana/docs/development/plugins/expressions/server/kibana-plugin-plugins-expressions-server.expressionastfunctionbuilder.addargument.md
2020-09-30 09:10:28 +02:00

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[Home](./index.md) &gt; [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) &gt; [ExpressionAstFunctionBuilder](./kibana-plugin-plugins-expressions-server.expressionastfunctionbuilder.md) &gt; [addArgument](./kibana-plugin-plugins-expressions-server.expressionastfunctionbuilder.addargument.md)
## ExpressionAstFunctionBuilder.addArgument property
Adds an additional argument to the function. For multi-args, this should be called once for each new arg. Note that TS will not enforce whether multi-args are available, so only use this to update an existing arg if you are certain it is a multi-arg.
<b>Signature:</b>
```typescript
addArgument: <A extends FunctionArgName<FnDef>>(name: A, value: FunctionArgs<FnDef>[A] | ExpressionAstExpressionBuilder) => this;
```