fix(type-safe-api): fix websocket api client compilation issue (#848)

The websocket api client library failed to compile due to a missing `runtime.ts` file, which the
models depend on. As `runtime.ts` is predominantly http api focussed, we add a `model-utils.ts` file
with just the required methods such that models are independent of http api files.

packages/type-safe-api/scripts/type-safe-api/generators/typescript-websocket-client/templates/index.ejs

@@ -8,6 +8,5 @@
 }
 ###/TSAPI_WRITE_FILE###/* tslint:disable */
 /* eslint-disable */
-export * from './runtime';
 export * from './models';
 export * from './client/client';

packages/type-safe-api/scripts/type-safe-api/generators/typescript/templates/client/models/modelUtils.ejs

@@ -0,0 +1,22 @@
+###TSAPI_WRITE_FILE###
+{
+  "id": "model-utils",
+  "dir": "<%= metadata.srcDir || 'src' %>/models",
+  "name": "model-utils",
+  "ext": ".ts",
+  "overwrite": true
+}
+###/TSAPI_WRITE_FILE###/* tslint:disable */
+/* eslint-disable */
+
+export function mapValues(data: any, fn: (item: any) => any) {
+  return Object.keys(data).reduce(
+    (acc, key) => ({ ...acc, [key]: fn(data[key]) }),
+    {}
+  );
+}
+
+export function exists(json: any, key: string) {
+  const value = json[key];
+  return value !== null && value !== undefined;
+}

packages/type-safe-api/scripts/type-safe-api/generators/typescript/templates/client/models/models.ejs

@@ -19,7 +19,7 @@
  * NOTE: This class is auto generated.
  * Do not edit the class manually.
  */
-import { exists, mapValues } from '../runtime';
+import { exists, mapValues } from './model-utils';
 <%_ model.uniqueImports.forEach((importName) => { _%>
 import type { <%= importName %> } from './<%= importName %>';
 import {