From 959503ec94aa08a6942780d7b7cd80847dbd4be6 Mon Sep 17 00:00:00 2001
From: Robert <bobert.mushky@gmail.com>
Date: Mon, 25 Oct 2021 19:14:01 -0700
Subject: [PATCH] rewrite CompressionAlgorithms to use numeric keys and export
 it

---
 packages/grpc-js/src/compression-filter.ts | 14 +++++++-------
 packages/grpc-js/src/index.ts              |  2 ++
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/packages/grpc-js/src/compression-filter.ts b/packages/grpc-js/src/compression-filter.ts
index 6c613612..eabb7a85 100644
--- a/packages/grpc-js/src/compression-filter.ts
+++ b/packages/grpc-js/src/compression-filter.ts
@@ -23,16 +23,16 @@ import { BaseFilter, Filter, FilterFactory } from './filter';
 import { Metadata, MetadataValue } from './metadata';
 import { ChannelOptions } from './channel-options';
 
-const CompressionAlgorithms = {
-  '0': 'identity',
-  '1': 'deflate',
-  '2': 'gzip'
+export const CompressionAlgorithms = {
+  0: 'identity',
+  1: 'deflate',
+  2: 'gzip'
 } as const;
 
 const CompressionAlgorithKeys = new Set(Object.keys(CompressionAlgorithms));
 
-const isCompressionAlgorithmKey = (key: string | undefined): key is keyof typeof CompressionAlgorithms => {
-  return typeof key === 'string' && CompressionAlgorithKeys.has(key);
+const isCompressionAlgorithmKey = (key: number | undefined): key is keyof typeof CompressionAlgorithms => {
+  return typeof key === 'number' && CompressionAlgorithKeys.has(key.toString());
 }
 
 type CompressionAlgorithm = (typeof CompressionAlgorithms)[keyof typeof CompressionAlgorithms];
@@ -187,7 +187,7 @@ export class CompressionFilter extends BaseFilter implements Filter {
   constructor(channelOptions: ChannelOptions) {
     super();
 
-    const compressionAlgorithmKey = channelOptions['grpc.default_compression_algorithm']?.toString();
+    const compressionAlgorithmKey = channelOptions['grpc.default_compression_algorithm'];
     if (isCompressionAlgorithmKey(compressionAlgorithmKey)) {
       this.defaultCompressionAlgorithm = CompressionAlgorithms[compressionAlgorithmKey];
       this.sendCompression = getCompressionHandler(this.defaultCompressionAlgorithm);
diff --git a/packages/grpc-js/src/index.ts b/packages/grpc-js/src/index.ts
index 4b7967be..7e1ed7a5 100644
--- a/packages/grpc-js/src/index.ts
+++ b/packages/grpc-js/src/index.ts
@@ -25,6 +25,7 @@ import {
 import { CallCredentials, OAuth2Client } from './call-credentials';
 import { Deadline, StatusObject } from './call-stream';
 import { Channel, ChannelImplementation } from './channel';
+import { CompressionAlgorithms } from './compression-filter';
 import { ConnectivityState } from './connectivity-state';
 import { ChannelCredentials } from './channel-credentials';
 import {
@@ -124,6 +125,7 @@ export {
   Status as status,
   ConnectivityState as connectivityState,
   Propagate as propagate,
+  CompressionAlgorithms as compressionAlgorithms
   // TODO: Other constants as well
 };