docs: added reference for JS Client (#1629)

* added reference for JS Client

* added reference for JS Client

* added reference for JS Client

docs/content/references/js-client/interfaces/internal.FunctionConstructor.md

@@ -0,0 +1,37 @@
+---
+displayed_sidebar: jsClientSidebar
+---
+
+# Interface: FunctionConstructor
+
+[internal](../modules/internal.md).FunctionConstructor
+
+## Callable
+
+### FunctionConstructor
+
+▸ **FunctionConstructor**(...`args`): [`Function`](../modules/internal.md#function)
+
+#### Parameters
+
+| Name | Type |
+| :------ | :------ |
+| `...args` | `string`[] |
+
+#### Returns
+
+[`Function`](../modules/internal.md#function)
+
+#### Defined in
+
+node_modules/typescript/lib/lib.es5.d.ts:314
+
+## Properties
+
+### prototype
+
+• `Readonly` **prototype**: [`Function`](../modules/internal.md#function)
+
+#### Defined in
+
+node_modules/typescript/lib/lib.es5.d.ts:315