TS 4.2README.md TypeScript 4.2 https://devblogs.microsoft.com/typescript/announcing-typescript-4-2/ New Features Leading/Middle Rest Elements in Tuple Types 下記のように、Rest Elements が tuple の最初でなくても使えるようになっています。 let foo: [...string[], number]; foo = [123]; foo = ["hello", 123]; foo = ["hello!", "hello!", "hello!", 123]; let bar: [boolean, ...string[], boolean]; bar = [true, false]; bar = [true, "some text",
