chore: update rds model#4

Author: Chase Coalwell

clients/node/client-rds-data-node/lib/smithy.ts

@@ -0,0 +1,44 @@
+export const TYPE = "__type";
+
+/**
+ * Checks if the given value is a Smithy structure of the given type.
+ */
+export function isa<T>(o: any, ...ids: string[]): o is T {
+  return typeof o === "object" && TYPE in o && ids.indexOf(o[TYPE]) > -1;
+}
+
+/**
+ * Type that is implemented by all Smithy shapes marked with the
+ * error trait.
+ */
+export interface SmithyException {
+  /**
+   * The shape ID of the exception.
+   */
+  readonly __type: string;
+
+  /**
+   * Whether the client or server are at fault.
+   */
+  readonly $fault: "client" | "server";
+
+  /**
+   * The name of the error.
+   */
+  readonly $name: string;
+
+  /**
+   * The service that encountered the exception.
+   */
+  readonly $service?: string;
+}
+
+/**
+ * Smithy document type values.
+ */
+export namespace DocumentType {
+  export type Value = Scalar | Structure | List;
+  export type Scalar = string | number | boolean | null | Uint8Array | Date;
+  export type Structure = { [member: string]: Value };
+  export interface List extends Array<Value> {}
+}