TypeError inextractAgentNameFromSessionTitle when sessionTitle is non-string

[de-abreu]

Bug Description

When running opencode with the notifier plugin, opencode fails to launch with the following error:

{
  "name": "UnknownError",
  "data": {
    "message": "TypeError: undefined is not a function (near '...sessionTitle.match(/\\s*\\(@([^\\s)]+)\\s+subagent\\)\\s*$/)...')\n    at extractAgentNameFromSessionTitle (/home/abreu/.cache/opencode/node_modules/@mohak34/opencode-notifier/dist/index.js:849:30)"
  }
}

Root Cause

The extractAgentNameFromSessionTitle function in dist/index.js:845-851 has a type safety bug:

function extractAgentNameFromSessionTitle(sessionTitle) {
  if (!sessionTitle) {
    return "";
  }
  const match = sessionTitle.match(/\s*\(@([^\s)]+)\s+subagent\)\s*$/);
  return match ? match[1] : "";
}

Problem: The guard if (!sessionTitle) only catches falsy values (null, undefined, "", 0, false). If sessionTitle is a truthy non-string value (e.g., anumber, object, or array), it passes the guard, but .match() doesn't exist on non-string types, causing undefined is not a function.

Data flow:

1. getSessionInfo() calls client.session.get() API
2. Returns { title: response.data?.title ?? null } (line973)
3. The API response title might not be a string
4. This non-string value gets passed to extractAgentNameFromSessionTitle() (line1027)

Suggested Fix

Add a type check before calling .match():

function extractAgentNameFromSessionTitle(sessionTitle) {
  if (!sessionTitle || typeof sessionTitle !== 'string') {
    return "";
  }
  const match = sessionTitle.match(/\s*\(@([^\s)]+)\s+subagent\)\s*$/);
  return match ? match[1] : "";
}

Or convert to string safely:

function extractAgentNameFromSessionTitle(sessionTitle) {
  const title = String(sessionTitle ?? "");
  const match = title.match(/\s*\(@([^\s)]+)\s+subagent\)\s*$/);
  return match ? match[1] : "";
}

##Environment

• Plugin version: (installed via npm from @mohak34/opencode-notifier)
• OpenCode version: Latest
• OS: NixOS Linux

Workaround

Currently removing the plugin from opencode configuration to avoid the crash.

[mohak34]

Hey thanks for the info, this is fixed in the latest version v0.2.1

[mohak34]

This should be added/fixed in 0.2.2. If you have any issues let me know.