Error: Argument of type 'string | undefined' is not assignable to parameter of type 'string'

Question

I am having this error: Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'. TS2345

if (menu.authenticated && menu.canView?.includes(profile?.accountType)) {
    |                                              ^**Error is here**
123 |            return loggedInUser && <MenuItem key={menu.resource} {...menu} />;
124 |       } else {
125 |         return !loggedInUser && <MenuItem key={menu.resource} {...menu} />;

what's the data type of menu.authenticated and menu.canView? — Zain Khan
– Zain Khan, Commented Feb 16, 2022 at 9:43

user16540390 · Accepted Answer · 2022-02-16 10:05:22Z

1

The argument to menu.canView?.includes has to be of type string, but profile?.accountType is of type string | undefined.

You can fix the condition with

if (menu.authenticated && profile && menu.canView?.includes(profile.accountType)) {

answered Feb 16, 2022 at 10:05

user16540390

Sign up to request clarification or add additional context in comments.

1 Comment

TKoL Over a year ago

maybe && profile.accountType as well

Collectives™ on Stack Overflow

Error: Argument of type 'string | undefined' is not assignable to parameter of type 'string'

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related