This issue occurs when the variable level is initialized with the value 'undefined'.
Although this code functions correctly in JavaScript, it encounters problems when using TypeScript.
interface Find {
level?: string;
}
let find: Find = {};
if (!!level) {
find.level = level;
}
The final value of the object 'find' will be:
{"level":"undefined"}
Instead of just:
{}
The current value is:
{"level":"undefined"}
If it were undefined it would display as:
{"level":undefined}
But what you actually have is the string "undefined".
interface Find {
level?: string;
}
let find: Find = {};
if (!!level && level !== "undefined") {
find.level = level;
}
Now you will see {}.
TypeScript does not impact JavaScript runtime behavior.
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