How should I proceed if a TypeScript definition file that I am relying on is lacking a specific definition?

I have encountered an issue while using the React type definitions for my project. The focus method is missing on elements in the array returned by the refs property, which prevents me from getting a specific example to work. The compiler error states: 

property 'focus' does not exist on type 'Component <any, any> | Element'
. This discrepancy arises because the focus method exists on type HTMLElement and not Element. I am unsure whether the definition file should specify the return type of refs as | HTMLElement or another extended interface that includes the focus method.

Now, I am at a standstill in my development process. I could manually patch the definition file by forking it, but this recurring TypeScript issue hinders my progress. Is there a more efficient solution that would allow me to quickly move forward without constantly having to pause my app-building process for TypeScript patching?

javascripttypescript

Answer №1

If you're looking for a quick and straightforward solution, you can simply cast to any to bypass type checking like so:

 onSubmitEditing={(event) => { 
    (this.refs.SecondInput as any).focus(); 
 }}

Consider submitting a pull request on DefinitelyTyped for a more refined approach...

Keep in mind that you have the option to be more 'sophisticated' by using "double casting to any" if necessary:

 type ProperRef = Component <any, any> | HTMLElement

 onSubmitEditing={(event) => { 
    const secondRef =  this.refs.SecondInput as any as ProperRef;
    secondRef.focus(); 
 }}

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