Add ESLint (#941)

* Add eslint, switch to lint-staged for precommit

* Fix all ESLint errors

* Update GH workflow to check prettier and eslint

1 files changed, 3 insertions, 5 deletions

diff --git a/src/util/dtos/DmChannelDTO.ts b/src/util/dtos/DmChannelDTO.ts

index 9d4d8dc3..02f7e8f3 100644
--- a/src/util/dtos/DmChannelDTO.ts
+++ b/src/util/dtos/DmChannelDTO.ts
@@ -44,16 +44,14 @@ export class DmChannelDTO {
 		obj.type = channel.type;
 		obj.recipients = (
 			await Promise.all(
-				channel
-					.recipients!.filter(
-						(r) => !excluded_recipients.includes(r.user_id),
-					)
+				channel.recipients
+					?.filter((r) => !excluded_recipients.includes(r.user_id))
 					.map(async (r) => {
 						return await User.findOneOrFail({
 							where: { id: r.user_id },
 							select: PublicUserProjection,
 						});
-					}),
+					}) || [],
 			)
 		).map((u) => new MinimalPublicUserDTO(u));
 		return obj;