playwright-slack-reportを追加。インストール手順: https://www.npmjs.com/package/playwright-slack-report npm install playwright-slack-report -D playwright.config.ts に以下を追加。 reporter: [ [ "./node_modules/playwright-slack-report/dist/src/SlackReporter.js", { slackWebHookUrl: process.env.SLACK_HOOK, sendResults: "always", // "always" , "on-failure", "off" }, ], ], .env にWebhookのURLを追加する。 SLACK_HOOK="https://hooks.