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TypeScriptで FileReaderのonloadした後、resultに対してエラーが出る時の暫定対処

FileReader

https://developer.mozilla.org/ja/docs/Web/API/FileReader/result

なんかおかしいらしい。

スクリーンショット 2020-01-23 15.48.46.png

TS2339: Property 'result' does not exist on type 'EventTarget'

なぜか怒られる

https://github.com/Microsoft/TypeScript/issues/4163
なんかおかしいらしい。
※翻訳してまで読んでないので興味がある方は調べてください。

const reader = new FileReader();
      reader.onload = (e) => {
        //(e.target as any)でany型に変換する
        console.log((e.target as any).result);
      };
      reader.readAsDataURL(file);
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