Recently, I encountered an issue with my TypeScript code (version 3.9.5):
const height: number = $(window).height();
This resulted in the following error message:
TS2322: Type 'number | undefined' is not assignable to type 'number'.
After some investigation, I found out that the relevant packages being used are:
"jquery": "^3.4.1",
"@types/jquery": "^3.5.0"
I am now looking for the correct approach to resolve this TypeScript issue. Any suggestions would be appreciated.
The type of height does not need to be explicitly specified as it can be inferred.
If you do want to ensure that height is specifically a number, make sure to handle the scenario where the result of $(window).height() is undefined.
For example:
const height: number = $(window).height() || 0
Alternatively, you can let the type be inferred:
// The type of height will be number | undefined
const height = $(window).height()
Another option is to force the typing system to comply with your needs, although this is not typically recommended:
// It's not ideal but possible.
const height = ($(window).height() as number)
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