table types do not accept userdata as keys

[hishamhm]

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I tried to declare a table of type { file : {string} } and got a syntax error.

[andremm]

I tried to declare a table of type { file : {string} } and got a syntax error.

This table type is not valid in Typed Lua. The type of the keys in a table type can only be literal types, base types, or the top type value.

In this case, you need to use { value : {string} }.