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diff --git a/frontend-old/node_modules/@grpc/grpc-js/src/call-credentials.ts b/frontend-old/node_modules/@grpc/grpc-js/src/call-credentials.ts
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+/*
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+import { Metadata } from './metadata';
+
+export interface CallMetadataOptions {
+  service_url: string;
+}
+
+export type CallMetadataGenerator = (
+  options: CallMetadataOptions,
+  cb: (err: Error | null, metadata?: Metadata) => void
+) => void;
+
+// google-auth-library pre-v2.0.0 does not have getRequestHeaders
+// but has getRequestMetadata, which is deprecated in v2.0.0
+export interface OldOAuth2Client {
+  getRequestMetadata: (
+    url: string,
+    callback: (
+      err: Error | null,
+      headers?: {
+        [index: string]: string;
+      }
+    ) => void
+  ) => void;
+}
+
+export interface CurrentOAuth2Client {
+  getRequestHeaders: (url?: string) => Promise<{ [index: string]: string }>;
+}
+
+export type OAuth2Client = OldOAuth2Client | CurrentOAuth2Client;
+
+function isCurrentOauth2Client(
+  client: OAuth2Client
+): client is CurrentOAuth2Client {
+  return (
+    'getRequestHeaders' in client &&
+    typeof client.getRequestHeaders === 'function'
+  );
+}
+
+/**
+ * A class that represents a generic method of adding authentication-related
+ * metadata on a per-request basis.
+ */
+export abstract class CallCredentials {
+  /**
+   * Asynchronously generates a new Metadata object.
+   * @param options Options used in generating the Metadata object.
+   */
+  abstract generateMetadata(options: CallMetadataOptions): Promise<Metadata>;
+  /**
+   * Creates a new CallCredentials object from properties of both this and
+   * another CallCredentials object. This object's metadata generator will be
+   * called first.
+   * @param callCredentials The other CallCredentials object.
+   */
+  abstract compose(callCredentials: CallCredentials): CallCredentials;
+
+  /**
+   * Check whether two call credentials objects are equal. Separate
+   * SingleCallCredentials with identical metadata generator functions are
+   * equal.
+   * @param other The other CallCredentials object to compare with.
+   */
+  abstract _equals(other: CallCredentials): boolean;
+
+  /**
+   * Creates a new CallCredentials object from a given function that generates
+   * Metadata objects.
+   * @param metadataGenerator A function that accepts a set of options, and
+   * generates a Metadata object based on these options, which is passed back
+   * to the caller via a supplied (err, metadata) callback.
+   */
+  static createFromMetadataGenerator(
+    metadataGenerator: CallMetadataGenerator
+  ): CallCredentials {
+    return new SingleCallCredentials(metadataGenerator);
+  }
+
+  /**
+   * Create a gRPC credential from a Google credential object.
+   * @param googleCredentials The authentication client to use.
+   * @return The resulting CallCredentials object.
+   */
+  static createFromGoogleCredential(
+    googleCredentials: OAuth2Client
+  ): CallCredentials {
+    return CallCredentials.createFromMetadataGenerator((options, callback) => {
+      let getHeaders: Promise<{ [index: string]: string }>;
+      if (isCurrentOauth2Client(googleCredentials)) {
+        getHeaders = googleCredentials.getRequestHeaders(options.service_url);
+      } else {
+        getHeaders = new Promise((resolve, reject) => {
+          googleCredentials.getRequestMetadata(
+            options.service_url,
+            (err, headers) => {
+              if (err) {
+                reject(err);
+                return;
+              }
+              if (!headers) {
+                reject(new Error('Headers not set by metadata plugin'));
+                return;
+              }
+              resolve(headers);
+            }
+          );
+        });
+      }
+      getHeaders.then(
+        headers => {
+          const metadata = new Metadata();
+          for (const key of Object.keys(headers)) {
+            metadata.add(key, headers[key]);
+          }
+          callback(null, metadata);
+        },
+        err => {
+          callback(err);
+        }
+      );
+    });
+  }
+
+  static createEmpty(): CallCredentials {
+    return new EmptyCallCredentials();
+  }
+}
+
+class ComposedCallCredentials extends CallCredentials {
+  constructor(private creds: CallCredentials[]) {
+    super();
+  }
+
+  async generateMetadata(options: CallMetadataOptions): Promise<Metadata> {
+    const base: Metadata = new Metadata();
+    const generated: Metadata[] = await Promise.all(
+      this.creds.map(cred => cred.generateMetadata(options))
+    );
+    for (const gen of generated) {
+      base.merge(gen);
+    }
+    return base;
+  }
+
+  compose(other: CallCredentials): CallCredentials {
+    return new ComposedCallCredentials(this.creds.concat([other]));
+  }
+
+  _equals(other: CallCredentials): boolean {
+    if (this === other) {
+      return true;
+    }
+    if (other instanceof ComposedCallCredentials) {
+      return this.creds.every((value, index) =>
+        value._equals(other.creds[index])
+      );
+    } else {
+      return false;
+    }
+  }
+}
+
+class SingleCallCredentials extends CallCredentials {
+  constructor(private metadataGenerator: CallMetadataGenerator) {
+    super();
+  }
+
+  generateMetadata(options: CallMetadataOptions): Promise<Metadata> {
+    return new Promise<Metadata>((resolve, reject) => {
+      this.metadataGenerator(options, (err, metadata) => {
+        if (metadata !== undefined) {
+          resolve(metadata);
+        } else {
+          reject(err);
+        }
+      });
+    });
+  }
+
+  compose(other: CallCredentials): CallCredentials {
+    return new ComposedCallCredentials([this, other]);
+  }
+
+  _equals(other: CallCredentials): boolean {
+    if (this === other) {
+      return true;
+    }
+    if (other instanceof SingleCallCredentials) {
+      return this.metadataGenerator === other.metadataGenerator;
+    } else {
+      return false;
+    }
+  }
+}
+
+class EmptyCallCredentials extends CallCredentials {
+  generateMetadata(options: CallMetadataOptions): Promise<Metadata> {
+    return Promise.resolve(new Metadata());
+  }
+
+  compose(other: CallCredentials): CallCredentials {
+    return other;
+  }
+
+  _equals(other: CallCredentials): boolean {
+    return other instanceof EmptyCallCredentials;
+  }
+}