chore(logging): strip redundant console prefixes

src/logging/console-prefix.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest";
+
+import { stripRedundantSubsystemPrefixForConsole } from "../logging.js";
+
+describe("stripRedundantSubsystemPrefixForConsole", () => {
+  it("drops '<subsystem>:' prefix", () => {
+    expect(
+      stripRedundantSubsystemPrefixForConsole("discord: hello", "discord"),
+    ).toBe("hello");
+  });
+
+  it("drops '<subsystem> ' prefix", () => {
+    expect(
+      stripRedundantSubsystemPrefixForConsole(
+        "discord gateway: closed",
+        "discord",
+      ),
+    ).toBe("gateway: closed");
+  });
+
+  it("keeps messages that do not start with the subsystem", () => {
+    expect(
+      stripRedundantSubsystemPrefixForConsole("discordant: hello", "discord"),
+    ).toBe("discordant: hello");
+  });
+});