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@syuilo

Node.jsで捕捉されなかったPromise内の例外をスタックトレースで表示する

More than 3 years have passed since last update.

現在のNode.js(9.x)においてデフォルトでは、Promise内の捕捉されなかった例外については次のように警告を出してくれますが詳細なスタックトレースは見せてくれません。

(node:5212) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 3): TypeError: Cannot read property '_id' of null
(node:5212) DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

どこかしらに次のハンドラを書くことで...

process.on('unhandledRejection', console.dir);

詳細な情報が見れます:

TypeError: Cannot read property '_id' of null
    at _callee2$ (C:/Users/syuilo/Desktop/misskey/built/api/serializers/post.js:98:34)
    at tryCatch (C:\Users\syuilo\Desktop\misskey\node_modules\regenerator-runtime\runtime.js:64:40)
    at Generator.invoke [as _invoke] (C:\Users\syuilo\Desktop\misskey\node_modules\regenerator-runtime\runtime.js:355:22)
    at fulfilled (C:/Users/syuilo/Desktop/misskey/built/api/serializers/post.js:7:32)
    at process._tickCallback (internal/process/next_tick.js:103:7)

もしくは、loud-rejectionライブラリを利用するのも良い手だと思います。

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77
Help us understand the problem. What is going on with this article?