Rename expectChannel to expectTunnel

I think I'm using the word 'channel' for the individual streams within a
connection, and the word 'tunnel' for the overall bundle of streams that
are going over a given TCP socket.

lib/contract.ts

@@ -21,7 +21,7 @@ export interface RequestOptions {
   bodyStream?: ReadableStream<Uint8Array>;
 
   accept?: string;
-  expectChannel?: string[];
+  expectTunnel?: string[];
   expectStream?: boolean;
   expectJson?: boolean;
 }
@@ -54,7 +54,7 @@ export interface ChannelTunnel {
 }
 
 export interface RestClient {
-  performRequest(opts: RequestOptions & {expectChannel: string[]}): Promise<ChannelTunnel>;
+  performRequest(opts: RequestOptions & {expectTunnel: string[]}): Promise<ChannelTunnel>;
   performRequest(opts: RequestOptions & {expectStream: true; expectJson: true}): Promise<ReadableStream<JSONValue>>;
   performRequest(opts: RequestOptions & {expectStream: true}): Promise<ReadableStream<Uint8Array>>;
   performRequest(opts: RequestOptions & {expectJson: true}): Promise<JSONValue>;

transports/via-kubeconfig.ts

@@ -103,7 +103,7 @@ export class KubeConfigRestClient implements RestClient {
       console.error(opts.method, path);
     }
 
-    if (opts.expectChannel) throw new Error(
+    if (opts.expectTunnel) throw new Error(
       `Channel-based APIs are not currently implemented by this client.`);
 
     const headers: Record<string, string> = {};

transports/via-kubectl-raw.ts

@@ -108,7 +108,7 @@ export class KubectlRawRestClient implements RestClient {
     const hasReqBody = opts.bodyJson !== undefined || !!opts.bodyRaw || !!opts.bodyStream;
     isVerbose && console.error(opts.method, path, hasReqBody ? '(w/ body)' : '');
 
-    if (opts.expectChannel) throw new Error(
+    if (opts.expectTunnel) throw new Error(
       `Channel-based APIs are not currently implemented by this client.`);
 
     let rawArgs = [command, ...(hasReqBody ? ['-f', '-'] : []), "--raw", path];