I have this piece of code where I want to convert test variable which is of type string | undefined to testString of type string. I need help to define the logic to change the type.
@Function()
public formatGit(tests: Gitdb): string | undefined {
var test = tests.gitIssue;
var testString = ??
return test;
}
You need to define the behaviour that should occur when the string is undefined.
If you want an empty string instead of undefined you could do something like this:
@Function()
public formatGit(tests: Gitdb): string {
return tests.gitIssue ?? "";
}
If you want to throw an error you could do this:
@Function()
public formatGit(tests: Gitdb): string {
if(tests.gitIssue === undefined){
throw Error("fitIssue cannot be undefined");
}
return tests.gitIssue;
}
Or you can force the type like this, however, this will result in types that don't reflect the actual values at runtime:
@Function()
public formatGit(tests: Gitdb): string {
return tests.gitIssue as string;
}
You could do a type casting if you are sure test is a string:
var testString = test as string;