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型 'string | undefined' を型 'string' に割り当てることはできません。

Posted at

学習中の備忘録として

auth.ts
export const signOut = () => {
  return client.delete("/auth/sign_out", { headers: {
    "access-token": Cookies.get("_access_token"),
    "client": Cookies.get("_client"),
    "uid": Cookies.get("_uid"),
  }})
}

だと

Type 'string | undefined' is not assignable to type 'string'.
  Type 'undefined' is not assignable to type 'string'.  TS2322

    17 | export const signOut = () => {
    18 |   return client.delete("/auth/sign_out", { headers: {
  > 19 |     "access-token": Cookies.get("_access_token"),
       |     ^
    20 |     "client": Cookies.get("_client") || "",
    21 |     "uid": Cookies.get("_uid") || "",
    22 |   }})

とのコンパイルエラーとなったので、String || undefinedと明示してあげる必要があると思い下記のように修正した。

auth.ts
export const signOut = () => {
  return client.delete("/auth/sign_out", { headers: {
    "access-token": Cookies.get("_access_token") || "",
    "client": Cookies.get("_client") || "",
    "uid": Cookies.get("_uid") || "",
  }})
}

無事コンパイルされ期待した通りに動いた。
(何気にあれこれ試してここで3時間は潰れた)

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