What causes the error message "Expected ':' when utilizing null conditional in TypeScript?"

UPDATE: After receiving CodeCaster's comment, I realized the issue was due to me using TypeScript version 3.5 instead of 3.7+. It was surprising because these checks seemed to be working fine with other Angular elements, such as 

<div *ngIf="parts?.length"></div>
.

In my TypeScript code, I have the following snippet:

if (!this.session.draftData?.length) {
   return;
}

I've successfully used similar checks in other parts of my code, but now the compiler is throwing this error: error TS1005: ':' expected.

typescript

Answer №1

Make sure to review the brackets in your code carefully, as they may be causing the error. from my point of view

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