[Typescript] Definite assignment operator

The definite assignment !: operator is used to suppress TypeScript’s objections about a class field being used, when it can’t be proven¹ that it was initialized.

Definite assignment operator can help with this case, if you are sure that the code will handle the assignement.

isSetup!: boolean

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来源： https://www.cnblogs.com/Answer1215/p/16548591.html