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【TypeScript入門】呼び出しシグネチャとは

まとめ

呼び出しシグネチャを使うことでアノテーションをたくさん書く必要がなくなります。また、再利用ができるのでコードの質も高まります。

呼び出しシグネチャとは

  • どのような関数なのかを表現する型定義
  • 省略記法はアロー関数と似た形
  • 安全な記法はオブジェクトと似た形
省略版
type LogMessage = (message: string) => void
export const logMessage: LogMessage = (message) => {
  console.log('sample:', message)
}
完全版
type FullLogMessage = {
  (message: string): void
}
export const logMessage: FullLogMessage = (message) => {
  console.log('sample:', message)
}
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