add createAdminClient lib to cli

packages/cli/src/lib/admin-api-client.ts

@@ -0,0 +1,63 @@
+type AdminAPIResponse = {
+  errors: Error[] | null;
+  data: object | null;
+};
+
+const defaultOptions = {variables: {}};
+
+type DefaultOptions = {
+  variables: Record<string, any> | undefined;
+};
+
+/**
+ * A basic Admin API fetch-based client.
+ */
+export function createAdminClient({
+  adminApiVersion,
+  privateAdminToken,
+  storeDomain,
+}: {
+  adminApiVersion: string;
+  privateAdminToken: string;
+  storeDomain: string;
+}) {
+  async function admin<T>(
+    query: string | null,
+    options?: DefaultOptions,
+  ): Promise<T> {
+    if (!query) {
+      throw new Error('Must provide a `query` to the admin client');
+    }
+
+    const endpoint = `${storeDomain}/admin/api/${adminApiVersion}/graphql.json`;
+    const reqInit = {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'X-Shopify-Access-Token': privateAdminToken,
+      },
+      body: JSON.stringify({
+        query,
+        variables: options?.variables || defaultOptions.variables,
+      }),
+    };
+
+    const request = await fetch(endpoint, reqInit);
+
+    if (!request.ok) {
+      throw new Error(
+        `graphql api request not ok ${request.status} ${request.statusText}`,
+      );
+    }
+
+    const response: AdminAPIResponse = await request.json();
+
+    if (response?.errors?.length) {
+      throw new Error(response.errors[0].message);
+    }
+
+    return response.data as T;
+  }
+
+  return {admin};
+}