Why doesn't TypeScript raise an error or warning in the following code snippet?
In the index type for map["xx"], it is specified as string, but in the map signature it's defined as number.
Should any configuration be set in tsconfig to address this issue?
let map: { [index: number]: string } = { };
map["xx"] = "2000";
If you have not set strict: true or noImplicitAny: true in your tsconfig.json, it is completely normal for the index in bracket notation to be treated as any.
For more details on this issue, you can refer to:
https://github.com/microsoft/TypeScript/issues/7660
You can view the outcome before and after enabling noImplicitAny in this playground:
noImplicitAny, no error will occur.noImplicitAny, an error will be prompted regarding map["xx"]P.S.
You have the option to use either noImplicitAny: true or strict: true, with strict mode encompassing noImplicitAny and 6 additional implicit checks. Refer to the typescript documentation for further information.
While strict mode is not the default setting due to migration concerns and legacy issues, the TypeScript team highly recommends enabling strict: true in their thoughts on using strict mode in TypeScript.
Indeed, by default, TypeScript's tsconfig does not enable strict mode. However, whenever possible, our team encourages users to transition towards incorporating strict mode into their configurations.
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