Support choosing channel to download SDK components from.

lib/channel-id-mapper.js

@@ -0,0 +1,21 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getChannelId = void 0;
+function getChannelId(channelName) {
+    if (channelName === 'stable') {
+        return 0;
+    }
+    else if (channelName === 'beta') {
+        return 1;
+    }
+    else if (channelName === 'dev') {
+        return 2;
+    }
+    else if (channelName === 'canary') {
+        return 3;
+    }
+    else {
+        throw new Error(`Unexpected channel name: '${channelName}'.`);
+    }
+}
+exports.getChannelId = getChannelId;