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1 files changed, 715 insertions, 0 deletions

diff --git a/frontend-old/node_modules/@grpc/grpc-js/src/client.ts b/frontend-old/node_modules/@grpc/grpc-js/src/client.ts
new file mode 100644
index 0000000..e122f6c
--- /dev/null
+++ b/frontend-old/node_modules/@grpc/grpc-js/src/client.ts
@@ -0,0 +1,715 @@
+/*
+ * 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 {
+  ClientDuplexStream,
+  ClientDuplexStreamImpl,
+  ClientReadableStream,
+  ClientReadableStreamImpl,
+  ClientUnaryCall,
+  ClientUnaryCallImpl,
+  ClientWritableStream,
+  ClientWritableStreamImpl,
+  ServiceError,
+  callErrorFromStatus,
+  SurfaceCall,
+} from './call';
+import { CallCredentials } from './call-credentials';
+import { StatusObject } from './call-interface';
+import { Channel, ChannelImplementation } from './channel';
+import { ConnectivityState } from './connectivity-state';
+import { ChannelCredentials } from './channel-credentials';
+import { ChannelOptions } from './channel-options';
+import { Status } from './constants';
+import { Metadata } from './metadata';
+import { ClientMethodDefinition } from './make-client';
+import {
+  getInterceptingCall,
+  Interceptor,
+  InterceptorProvider,
+  InterceptorArguments,
+  InterceptingCallInterface,
+} from './client-interceptors';
+import {
+  ServerUnaryCall,
+  ServerReadableStream,
+  ServerWritableStream,
+  ServerDuplexStream,
+} from './server-call';
+import { Deadline } from './deadline';
+
+const CHANNEL_SYMBOL = Symbol();
+const INTERCEPTOR_SYMBOL = Symbol();
+const INTERCEPTOR_PROVIDER_SYMBOL = Symbol();
+const CALL_INVOCATION_TRANSFORMER_SYMBOL = Symbol();
+
+function isFunction<ResponseType>(
+  arg: Metadata | CallOptions | UnaryCallback<ResponseType> | undefined
+): arg is UnaryCallback<ResponseType> {
+  return typeof arg === 'function';
+}
+
+export interface UnaryCallback<ResponseType> {
+  (err: ServiceError | null, value?: ResponseType): void;
+}
+
+/* eslint-disable @typescript-eslint/no-explicit-any */
+export interface CallOptions {
+  deadline?: Deadline;
+  host?: string;
+  parent?:
+    | ServerUnaryCall<any, any>
+    | ServerReadableStream<any, any>
+    | ServerWritableStream<any, any>
+    | ServerDuplexStream<any, any>;
+  propagate_flags?: number;
+  credentials?: CallCredentials;
+  interceptors?: Interceptor[];
+  interceptor_providers?: InterceptorProvider[];
+}
+/* eslint-enable @typescript-eslint/no-explicit-any */
+
+export interface CallProperties<RequestType, ResponseType> {
+  argument?: RequestType;
+  metadata: Metadata;
+  call: SurfaceCall;
+  channel: Channel;
+  methodDefinition: ClientMethodDefinition<RequestType, ResponseType>;
+  callOptions: CallOptions;
+  callback?: UnaryCallback<ResponseType>;
+}
+
+export interface CallInvocationTransformer {
+  (callProperties: CallProperties<any, any>): CallProperties<any, any>; // eslint-disable-line @typescript-eslint/no-explicit-any
+}
+
+export type ClientOptions = Partial<ChannelOptions> & {
+  channelOverride?: Channel;
+  channelFactoryOverride?: (
+    address: string,
+    credentials: ChannelCredentials,
+    options: ClientOptions
+  ) => Channel;
+  interceptors?: Interceptor[];
+  interceptor_providers?: InterceptorProvider[];
+  callInvocationTransformer?: CallInvocationTransformer;
+};
+
+function getErrorStackString(error: Error): string {
+  return error.stack!.split('\n').slice(1).join('\n');
+}
+
+/**
+ * A generic gRPC client. Primarily useful as a base class for all generated
+ * clients.
+ */
+export class Client {
+  private readonly [CHANNEL_SYMBOL]: Channel;
+  private readonly [INTERCEPTOR_SYMBOL]: Interceptor[];
+  private readonly [INTERCEPTOR_PROVIDER_SYMBOL]: InterceptorProvider[];
+  private readonly [CALL_INVOCATION_TRANSFORMER_SYMBOL]?: CallInvocationTransformer;
+  constructor(
+    address: string,
+    credentials: ChannelCredentials,
+    options: ClientOptions = {}
+  ) {
+    options = Object.assign({}, options);
+    this[INTERCEPTOR_SYMBOL] = options.interceptors ?? [];
+    delete options.interceptors;
+    this[INTERCEPTOR_PROVIDER_SYMBOL] = options.interceptor_providers ?? [];
+    delete options.interceptor_providers;
+    if (
+      this[INTERCEPTOR_SYMBOL].length > 0 &&
+      this[INTERCEPTOR_PROVIDER_SYMBOL].length > 0
+    ) {
+      throw new Error(
+        'Both interceptors and interceptor_providers were passed as options ' +
+          'to the client constructor. Only one of these is allowed.'
+      );
+    }
+    this[CALL_INVOCATION_TRANSFORMER_SYMBOL] =
+      options.callInvocationTransformer;
+    delete options.callInvocationTransformer;
+    if (options.channelOverride) {
+      this[CHANNEL_SYMBOL] = options.channelOverride;
+    } else if (options.channelFactoryOverride) {
+      const channelFactoryOverride = options.channelFactoryOverride;
+      delete options.channelFactoryOverride;
+      this[CHANNEL_SYMBOL] = channelFactoryOverride(
+        address,
+        credentials,
+        options
+      );
+    } else {
+      this[CHANNEL_SYMBOL] = new ChannelImplementation(
+        address,
+        credentials,
+        options
+      );
+    }
+  }
+
+  close(): void {
+    this[CHANNEL_SYMBOL].close();
+  }
+
+  getChannel(): Channel {
+    return this[CHANNEL_SYMBOL];
+  }
+
+  waitForReady(deadline: Deadline, callback: (error?: Error) => void): void {
+    const checkState = (err?: Error) => {
+      if (err) {
+        callback(new Error('Failed to connect before the deadline'));
+        return;
+      }
+      let newState;
+      try {
+        newState = this[CHANNEL_SYMBOL].getConnectivityState(true);
+      } catch (e) {
+        callback(new Error('The channel has been closed'));
+        return;
+      }
+      if (newState === ConnectivityState.READY) {
+        callback();
+      } else {
+        try {
+          this[CHANNEL_SYMBOL].watchConnectivityState(
+            newState,
+            deadline,
+            checkState
+          );
+        } catch (e) {
+          callback(new Error('The channel has been closed'));
+        }
+      }
+    };
+    setImmediate(checkState);
+  }
+
+  private checkOptionalUnaryResponseArguments<ResponseType>(
+    arg1: Metadata | CallOptions | UnaryCallback<ResponseType>,
+    arg2?: CallOptions | UnaryCallback<ResponseType>,
+    arg3?: UnaryCallback<ResponseType>
+  ): {
+    metadata: Metadata;
+    options: CallOptions;
+    callback: UnaryCallback<ResponseType>;
+  } {
+    if (isFunction(arg1)) {
+      return { metadata: new Metadata(), options: {}, callback: arg1 };
+    } else if (isFunction(arg2)) {
+      if (arg1 instanceof Metadata) {
+        return { metadata: arg1, options: {}, callback: arg2 };
+      } else {
+        return { metadata: new Metadata(), options: arg1, callback: arg2 };
+      }
+    } else {
+      if (
+        !(
+          arg1 instanceof Metadata &&
+          arg2 instanceof Object &&
+          isFunction(arg3)
+        )
+      ) {
+        throw new Error('Incorrect arguments passed');
+      }
+      return { metadata: arg1, options: arg2, callback: arg3 };
+    }
+  }
+
+  makeUnaryRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    argument: RequestType,
+    metadata: Metadata,
+    options: CallOptions,
+    callback: UnaryCallback<ResponseType>
+  ): ClientUnaryCall;
+  makeUnaryRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    argument: RequestType,
+    metadata: Metadata,
+    callback: UnaryCallback<ResponseType>
+  ): ClientUnaryCall;
+  makeUnaryRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    argument: RequestType,
+    options: CallOptions,
+    callback: UnaryCallback<ResponseType>
+  ): ClientUnaryCall;
+  makeUnaryRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    argument: RequestType,
+    callback: UnaryCallback<ResponseType>
+  ): ClientUnaryCall;
+  makeUnaryRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    argument: RequestType,
+    metadata: Metadata | CallOptions | UnaryCallback<ResponseType>,
+    options?: CallOptions | UnaryCallback<ResponseType>,
+    callback?: UnaryCallback<ResponseType>
+  ): ClientUnaryCall {
+    const checkedArguments =
+      this.checkOptionalUnaryResponseArguments<ResponseType>(
+        metadata,
+        options,
+        callback
+      );
+    const methodDefinition: ClientMethodDefinition<RequestType, ResponseType> =
+      {
+        path: method,
+        requestStream: false,
+        responseStream: false,
+        requestSerialize: serialize,
+        responseDeserialize: deserialize,
+      };
+    let callProperties: CallProperties<RequestType, ResponseType> = {
+      argument: argument,
+      metadata: checkedArguments.metadata,
+      call: new ClientUnaryCallImpl(),
+      channel: this[CHANNEL_SYMBOL],
+      methodDefinition: methodDefinition,
+      callOptions: checkedArguments.options,
+      callback: checkedArguments.callback,
+    };
+    if (this[CALL_INVOCATION_TRANSFORMER_SYMBOL]) {
+      callProperties = this[CALL_INVOCATION_TRANSFORMER_SYMBOL]!(
+        callProperties
+      ) as CallProperties<RequestType, ResponseType>;
+    }
+    const emitter: ClientUnaryCall = callProperties.call;
+    const interceptorArgs: InterceptorArguments = {
+      clientInterceptors: this[INTERCEPTOR_SYMBOL],
+      clientInterceptorProviders: this[INTERCEPTOR_PROVIDER_SYMBOL],
+      callInterceptors: callProperties.callOptions.interceptors ?? [],
+      callInterceptorProviders:
+        callProperties.callOptions.interceptor_providers ?? [],
+    };
+    const call: InterceptingCallInterface = getInterceptingCall(
+      interceptorArgs,
+      callProperties.methodDefinition,
+      callProperties.callOptions,
+      callProperties.channel
+    );
+    /* This needs to happen before the emitter is used. Unfortunately we can't
+     * enforce this with the type system. We need to construct this emitter
+     * before calling the CallInvocationTransformer, and we need to create the
+     * call after that. */
+    emitter.call = call;
+    let responseMessage: ResponseType | null = null;
+    let receivedStatus = false;
+    let callerStackError: Error | null = new Error();
+    call.start(callProperties.metadata, {
+      onReceiveMetadata: metadata => {
+        emitter.emit('metadata', metadata);
+      },
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      onReceiveMessage(message: any) {
+        if (responseMessage !== null) {
+          call.cancelWithStatus(Status.INTERNAL, 'Too many responses received');
+        }
+        responseMessage = message;
+      },
+      onReceiveStatus(status: StatusObject) {
+        if (receivedStatus) {
+          return;
+        }
+        receivedStatus = true;
+        if (status.code === Status.OK) {
+          if (responseMessage === null) {
+            const callerStack = getErrorStackString(callerStackError!);
+            callProperties.callback!(
+              callErrorFromStatus(
+                {
+                  code: Status.INTERNAL,
+                  details: 'No message received',
+                  metadata: status.metadata,
+                },
+                callerStack
+              )
+            );
+          } else {
+            callProperties.callback!(null, responseMessage);
+          }
+        } else {
+          const callerStack = getErrorStackString(callerStackError!);
+          callProperties.callback!(callErrorFromStatus(status, callerStack));
+        }
+        /* Avoid retaining the callerStackError object in the call context of
+         * the status event handler. */
+        callerStackError = null;
+        emitter.emit('status', status);
+      },
+    });
+    call.sendMessage(argument);
+    call.halfClose();
+    return emitter;
+  }
+
+  makeClientStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    metadata: Metadata,
+    options: CallOptions,
+    callback: UnaryCallback<ResponseType>
+  ): ClientWritableStream<RequestType>;
+  makeClientStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    metadata: Metadata,
+    callback: UnaryCallback<ResponseType>
+  ): ClientWritableStream<RequestType>;
+  makeClientStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    options: CallOptions,
+    callback: UnaryCallback<ResponseType>
+  ): ClientWritableStream<RequestType>;
+  makeClientStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    callback: UnaryCallback<ResponseType>
+  ): ClientWritableStream<RequestType>;
+  makeClientStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    metadata: Metadata | CallOptions | UnaryCallback<ResponseType>,
+    options?: CallOptions | UnaryCallback<ResponseType>,
+    callback?: UnaryCallback<ResponseType>
+  ): ClientWritableStream<RequestType> {
+    const checkedArguments =
+      this.checkOptionalUnaryResponseArguments<ResponseType>(
+        metadata,
+        options,
+        callback
+      );
+    const methodDefinition: ClientMethodDefinition<RequestType, ResponseType> =
+      {
+        path: method,
+        requestStream: true,
+        responseStream: false,
+        requestSerialize: serialize,
+        responseDeserialize: deserialize,
+      };
+    let callProperties: CallProperties<RequestType, ResponseType> = {
+      metadata: checkedArguments.metadata,
+      call: new ClientWritableStreamImpl<RequestType>(serialize),
+      channel: this[CHANNEL_SYMBOL],
+      methodDefinition: methodDefinition,
+      callOptions: checkedArguments.options,
+      callback: checkedArguments.callback,
+    };
+    if (this[CALL_INVOCATION_TRANSFORMER_SYMBOL]) {
+      callProperties = this[CALL_INVOCATION_TRANSFORMER_SYMBOL]!(
+        callProperties
+      ) as CallProperties<RequestType, ResponseType>;
+    }
+    const emitter: ClientWritableStream<RequestType> =
+      callProperties.call as ClientWritableStream<RequestType>;
+    const interceptorArgs: InterceptorArguments = {
+      clientInterceptors: this[INTERCEPTOR_SYMBOL],
+      clientInterceptorProviders: this[INTERCEPTOR_PROVIDER_SYMBOL],
+      callInterceptors: callProperties.callOptions.interceptors ?? [],
+      callInterceptorProviders:
+        callProperties.callOptions.interceptor_providers ?? [],
+    };
+    const call: InterceptingCallInterface = getInterceptingCall(
+      interceptorArgs,
+      callProperties.methodDefinition,
+      callProperties.callOptions,
+      callProperties.channel
+    );
+    /* This needs to happen before the emitter is used. Unfortunately we can't
+     * enforce this with the type system. We need to construct this emitter
+     * before calling the CallInvocationTransformer, and we need to create the
+     * call after that. */
+    emitter.call = call;
+    let responseMessage: ResponseType | null = null;
+    let receivedStatus = false;
+    let callerStackError: Error | null = new Error();
+    call.start(callProperties.metadata, {
+      onReceiveMetadata: metadata => {
+        emitter.emit('metadata', metadata);
+      },
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      onReceiveMessage(message: any) {
+        if (responseMessage !== null) {
+          call.cancelWithStatus(Status.INTERNAL, 'Too many responses received');
+        }
+        responseMessage = message;
+      },
+      onReceiveStatus(status: StatusObject) {
+        if (receivedStatus) {
+          return;
+        }
+        receivedStatus = true;
+        if (status.code === Status.OK) {
+          if (responseMessage === null) {
+            const callerStack = getErrorStackString(callerStackError!);
+            callProperties.callback!(
+              callErrorFromStatus(
+                {
+                  code: Status.INTERNAL,
+                  details: 'No message received',
+                  metadata: status.metadata,
+                },
+                callerStack
+              )
+            );
+          } else {
+            callProperties.callback!(null, responseMessage);
+          }
+        } else {
+          const callerStack = getErrorStackString(callerStackError!);
+          callProperties.callback!(callErrorFromStatus(status, callerStack));
+        }
+        /* Avoid retaining the callerStackError object in the call context of
+         * the status event handler. */
+        callerStackError = null;
+        emitter.emit('status', status);
+      },
+    });
+    return emitter;
+  }
+
+  private checkMetadataAndOptions(
+    arg1?: Metadata | CallOptions,
+    arg2?: CallOptions
+  ): { metadata: Metadata; options: CallOptions } {
+    let metadata: Metadata;
+    let options: CallOptions;
+    if (arg1 instanceof Metadata) {
+      metadata = arg1;
+      if (arg2) {
+        options = arg2;
+      } else {
+        options = {};
+      }
+    } else {
+      if (arg1) {
+        options = arg1;
+      } else {
+        options = {};
+      }
+      metadata = new Metadata();
+    }
+    return { metadata, options };
+  }
+
+  makeServerStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    argument: RequestType,
+    metadata: Metadata,
+    options?: CallOptions
+  ): ClientReadableStream<ResponseType>;
+  makeServerStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    argument: RequestType,
+    options?: CallOptions
+  ): ClientReadableStream<ResponseType>;
+  makeServerStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    argument: RequestType,
+    metadata?: Metadata | CallOptions,
+    options?: CallOptions
+  ): ClientReadableStream<ResponseType> {
+    const checkedArguments = this.checkMetadataAndOptions(metadata, options);
+    const methodDefinition: ClientMethodDefinition<RequestType, ResponseType> =
+      {
+        path: method,
+        requestStream: false,
+        responseStream: true,
+        requestSerialize: serialize,
+        responseDeserialize: deserialize,
+      };
+    let callProperties: CallProperties<RequestType, ResponseType> = {
+      argument: argument,
+      metadata: checkedArguments.metadata,
+      call: new ClientReadableStreamImpl<ResponseType>(deserialize),
+      channel: this[CHANNEL_SYMBOL],
+      methodDefinition: methodDefinition,
+      callOptions: checkedArguments.options,
+    };
+    if (this[CALL_INVOCATION_TRANSFORMER_SYMBOL]) {
+      callProperties = this[CALL_INVOCATION_TRANSFORMER_SYMBOL]!(
+        callProperties
+      ) as CallProperties<RequestType, ResponseType>;
+    }
+    const stream: ClientReadableStream<ResponseType> =
+      callProperties.call as ClientReadableStream<ResponseType>;
+    const interceptorArgs: InterceptorArguments = {
+      clientInterceptors: this[INTERCEPTOR_SYMBOL],
+      clientInterceptorProviders: this[INTERCEPTOR_PROVIDER_SYMBOL],
+      callInterceptors: callProperties.callOptions.interceptors ?? [],
+      callInterceptorProviders:
+        callProperties.callOptions.interceptor_providers ?? [],
+    };
+    const call: InterceptingCallInterface = getInterceptingCall(
+      interceptorArgs,
+      callProperties.methodDefinition,
+      callProperties.callOptions,
+      callProperties.channel
+    );
+    /* This needs to happen before the emitter is used. Unfortunately we can't
+     * enforce this with the type system. We need to construct this emitter
+     * before calling the CallInvocationTransformer, and we need to create the
+     * call after that. */
+    stream.call = call;
+    let receivedStatus = false;
+    let callerStackError: Error | null = new Error();
+    call.start(callProperties.metadata, {
+      onReceiveMetadata(metadata: Metadata) {
+        stream.emit('metadata', metadata);
+      },
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      onReceiveMessage(message: any) {
+        stream.push(message);
+      },
+      onReceiveStatus(status: StatusObject) {
+        if (receivedStatus) {
+          return;
+        }
+        receivedStatus = true;
+        stream.push(null);
+        if (status.code !== Status.OK) {
+          const callerStack = getErrorStackString(callerStackError!);
+          stream.emit('error', callErrorFromStatus(status, callerStack));
+        }
+        /* Avoid retaining the callerStackError object in the call context of
+         * the status event handler. */
+        callerStackError = null;
+        stream.emit('status', status);
+      },
+    });
+    call.sendMessage(argument);
+    call.halfClose();
+    return stream;
+  }
+
+  makeBidiStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    metadata: Metadata,
+    options?: CallOptions
+  ): ClientDuplexStream<RequestType, ResponseType>;
+  makeBidiStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    options?: CallOptions
+  ): ClientDuplexStream<RequestType, ResponseType>;
+  makeBidiStreamRequest<RequestType, ResponseType>(
+    method: string,
+    serialize: (value: RequestType) => Buffer,
+    deserialize: (value: Buffer) => ResponseType,
+    metadata?: Metadata | CallOptions,
+    options?: CallOptions
+  ): ClientDuplexStream<RequestType, ResponseType> {
+    const checkedArguments = this.checkMetadataAndOptions(metadata, options);
+    const methodDefinition: ClientMethodDefinition<RequestType, ResponseType> =
+      {
+        path: method,
+        requestStream: true,
+        responseStream: true,
+        requestSerialize: serialize,
+        responseDeserialize: deserialize,
+      };
+    let callProperties: CallProperties<RequestType, ResponseType> = {
+      metadata: checkedArguments.metadata,
+      call: new ClientDuplexStreamImpl<RequestType, ResponseType>(
+        serialize,
+        deserialize
+      ),
+      channel: this[CHANNEL_SYMBOL],
+      methodDefinition: methodDefinition,
+      callOptions: checkedArguments.options,
+    };
+    if (this[CALL_INVOCATION_TRANSFORMER_SYMBOL]) {
+      callProperties = this[CALL_INVOCATION_TRANSFORMER_SYMBOL]!(
+        callProperties
+      ) as CallProperties<RequestType, ResponseType>;
+    }
+    const stream: ClientDuplexStream<RequestType, ResponseType> =
+      callProperties.call as ClientDuplexStream<RequestType, ResponseType>;
+    const interceptorArgs: InterceptorArguments = {
+      clientInterceptors: this[INTERCEPTOR_SYMBOL],
+      clientInterceptorProviders: this[INTERCEPTOR_PROVIDER_SYMBOL],
+      callInterceptors: callProperties.callOptions.interceptors ?? [],
+      callInterceptorProviders:
+        callProperties.callOptions.interceptor_providers ?? [],
+    };
+    const call: InterceptingCallInterface = getInterceptingCall(
+      interceptorArgs,
+      callProperties.methodDefinition,
+      callProperties.callOptions,
+      callProperties.channel
+    );
+    /* This needs to happen before the emitter is used. Unfortunately we can't
+     * enforce this with the type system. We need to construct this emitter
+     * before calling the CallInvocationTransformer, and we need to create the
+     * call after that. */
+    stream.call = call;
+    let receivedStatus = false;
+    let callerStackError: Error | null = new Error();
+    call.start(callProperties.metadata, {
+      onReceiveMetadata(metadata: Metadata) {
+        stream.emit('metadata', metadata);
+      },
+      onReceiveMessage(message: Buffer) {
+        stream.push(message);
+      },
+      onReceiveStatus(status: StatusObject) {
+        if (receivedStatus) {
+          return;
+        }
+        receivedStatus = true;
+        stream.push(null);
+        if (status.code !== Status.OK) {
+          const callerStack = getErrorStackString(callerStackError!);
+          stream.emit('error', callErrorFromStatus(status, callerStack));
+        }
+        /* Avoid retaining the callerStackError object in the call context of
+         * the status event handler. */
+        callerStackError = null;
+        stream.emit('status', status);
+      },
+    });
+    return stream;
+  }
+}