fix: whitespace-only env var fallback, test env isolation, README wording

- OPENCODE_BELL_EVENTS with only spaces/commas now falls back to defaults
- Clean env vars before top-level import to prevent external pollution
- Change "Session-scoped debounce" to "Smart debounce" in features list

Author: Astro-Han

README.md

@@ -8,7 +8,7 @@ Never miss an OpenCode prompt again.
 - Zero dependencies — single-file plugin
 - Privacy-friendly — no message content, no external commands, no network calls
 - Configurable — choose which events trigger the bell
-- Session-scoped debounce — avoids bell spam during rapid events
+- Smart debounce — avoids bell spam for the same event type per session
 
 ## Install
 

index.js

@@ -1,8 +1,9 @@
 // 读取需要响铃的事件类型，逗号分隔，默认四类
 const DEFAULT_EVENTS = "permission.asked,question.asked,session.idle,session.error"
-// 空字符串也回退到默认值（用 || 而非 ??），避免用户设空串后全部静默
+// 空字符串或纯空白也回退到默认值，避免用户误设后全部静默
 const rawEvents = process.env.OPENCODE_BELL_EVENTS || DEFAULT_EVENTS
-const ENABLED_EVENTS = new Set(rawEvents.split(",").map((s) => s.trim()).filter(Boolean))
+const parsed = rawEvents.split(",").map((s) => s.trim()).filter(Boolean)
+const ENABLED_EVENTS = new Set(parsed.length > 0 ? parsed : DEFAULT_EVENTS.split(","))
 
 // 读取防抖毫秒数，解析失败或非正数则回退到 1200
 const parsedDebounce = parseInt(process.env.OPENCODE_BELL_DEBOUNCE, 10)

test/plugin.test.js

@@ -1,8 +1,11 @@
 import test from "node:test"
 import assert from "node:assert/strict"
 
-// 默认导入用于回归测试和 debounce/TTY 测试
-import { OpencodeBellPlugin } from "../index.js"
+// 确保顶层导入时 env var 是干净的，避免外部环境污染默认值
+delete process.env.OPENCODE_BELL_EVENTS
+delete process.env.OPENCODE_BELL_DEBOUNCE
+// 默认导入用于回归测试和 debounce/TTY 测试（依赖默认配置值）
+const { OpencodeBellPlugin } = await import("../index.js")
 
 // ─── 1. 回归：event.properties 缺失不报错 ─────────────────────────────────────