I want to exclude the firstName key from the string type of the key.
But I got the An index signature parameter type must be either 'string' or 'number'.ts(1023) error.
Sandbox demo: codesandbox.io/s/pzo4u?file=/index.ts
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mohammadreza berneti
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3Please alway try to share your code in same sandbox but not as image – captain-yossarian from Ukraine Mar 08 '21 at 13:31
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For me it is looks like XY problem. Your code is invalid. What are you trying to achieve? – captain-yossarian from Ukraine Mar 08 '21 at 13:34
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@captain-yossarian https://codesandbox.io/s/pzo4u?file=/index.ts – mohammadreza berneti Mar 08 '21 at 13:35
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@captain-yossarian I just want to declare a type that all the keys have the same type except some special keys. – mohammadreza berneti Mar 08 '21 at 13:36
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I don't think what you are trying is possible/supported in TS (neither the type "all strings except that string", nor an index structure that excludes a few properties) – ASDFGerte Mar 08 '21 at 13:37
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@ASDFGerte I think so, but I am not sure. – mohammadreza berneti Mar 08 '21 at 13:38
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The `Omit
` utility type requires a type from which you can remove certain keys (E.G. an interface). You're passing a string and that doesn't work. See https://www.typescriptlang.org/docs/handbook/utility-types.html#omittype-keys for futher explanation. – Leonardo Viada Mar 08 '21 at 13:38 -
1My approach was bad, here you have a solution https://stackoverflow.com/questions/61431397/how-to-define-typescript-type-as-a-dictionary-of-strings-but-with-one-numeric-i – captain-yossarian from Ukraine Mar 08 '21 at 13:52
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Thank you for your shared useful links. But it seems having a type like this actually is impossible. – mohammadreza berneti Mar 08 '21 at 14:00