Objects, Functions, and Type Narrowing | Learning TypeScript

TypeScript's type narrowing is a powerful feature of TypeScript's type system that lets it infer more specific types for values in areas of code. For example, TypeScript would understand that inside the following if statement, the fruit variable has to be the literal value "apple": tsconst fruit = Math.random() > 0.5 ? "apple" : undefined; fruit; const fruit: "apple" | undefined if (fruit) { fruit

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TypeScriptのNarrowingについて。 変数オブジェクトのプロパティ、関数呼び出し、関数の引数における型のNarrowingの挙動について