January 2023
Beginner to intermediate
372 pages
8h 47m
Korean
Content preview from 러닝 타입스크립트
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198
2
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}
// 타입: { movie: string, standup: string }
const preferencesMutable = {
movie: "maybe"
standup: "yes",
};
describePreference(preferencesMutable.movie);
// ~~~~~~~~~~~~~~~~~~~~~~~~// ~~~~~~~~~~~~~~~~~~~~~~~~
// Error: Argument of type 'string' is not assignable// Error: Argument of type 'string' is not assignable
// to parameter of type '"maybe" | "no" | "yes"'.// to parameter of type '"maybe" | "no" | "yes"'.
preferencesMutable.movie = "no"; // Ok
// 타입: readonly { readonly movie: "maybe", readonly standup: "yes" }
const preferencesReadonly = {
movie: "maybe"
standup: "yes",
} as const;
describePreference(preferencesReadonly.movie); // Ok
preferencesReadonly.movie ...