The type does not contain a property named 'x' - Error in Promise syntax - TS2339

I encountered a problem while working with Typescript that I couldn't quite figure out. Although I came across similar issues in other topics, I'm still struggling to find a solution for my particular issue. I can easily log userCredential.user.metadata.b, but I keep getting an error: Property 'b' does not exist on type 'UserMetadata'. Can someone please explain what I'm doing wrong here?

Below is the snippet of code

<pre>
 login(email: string, password: string): Promise<any> {
       return this.afAuth.signInWithEmailAndPassword(email, password)
           .then(userCredential => {
               const creationTime: number = userCredential.user.metadata.b; // <-here is a problem
               console.log('creationTinme', creationTime);
               this.handleAuthentication(
                   userCredential.user.email,
                   userCredential.user.uid,
                   'xxx',
                   creationTime
                   // metadata.creationTime expiresInuser.metadata
               );
           })
           .catch(error => {
                console.log(error);
           });
</pre>

Thank you in advance for any assistance provided.

angulartypescript

Answer №1

When TypeScript infers the type of userCredential, it uses information from the signInWithEmailAndPassword method. The problem arises when the type inferred for userCredential does not include the b property in the metadata property, even though it exists at runtime (as shown by console.log). To resolve this issue, you must adjust the type used by signInWithEmailAndPassword to include a b property in the metadata object, or consider using an index signature if that aligns better with your requirements.

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