I would like to create something similar to the following:
type ISomeType = 'one'|'two'|'more';
const bigBigBigDataType = {
...
someValue: 'bla-bla' oneOf ISomeType;
...
}
Although this code will run without any compilation errors, I am looking for a syntax that will prevent entering bla-bla into a someValue that should be of type ISomeType.
Simply creating a type for bigBigBigDataType is not the solution.
Creating an interface with an index signature allows for defining partial typings, as mentioned in a comment about only needing some of the types to be specified.
By specifying one property type and leaving the rest open-ended, you can have flexibility in defining the structure of your data.
type IDataType = 'first' | 'second' | 'more';
interface IPartialData {
dataType: IDataType;
[key: string]: any;
}
const incompleteData: IPartialData = {
dataType: 'abc', // Error: Type '"abc"' is not assignable to type 'IDataType'
anyProperty: 'value',
};
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