CODEWITHSUNDEEP
javascriptnode.jstypescriptfirebasefirebase-realtime-database
Divan van Biljon
Divan van Biljon

Reputation: 47

Argument of type not assignable to

I have this piece of code which gives me an error with typescript.

firebaseAdmin.firestore().collection('arenas').get()
    .then((snapshot: any) => {
        snapshot.forEach((element: any) => {
            scraptIt(firebaseFunctions.config().sports.url + element.data().url, {
                sports: {
                    listItem: '.LSport',
                    data: ['b']
                }
            }).then((data: any) => {
                sportsArray.push(data)
                sportsArray = [...new Set(data)]
            }).catch((err: any) => { res.send(err); console.log(err) })
        })
    }).catch((err: any) => { res.send(err); console.log(err) })

I'm receiving the following error

Argument of type '{ sports: { listItem: string; data: string[]; }; }' is not assignable to parameter of type 'ScrapeOptions'. Property 'sports' is incompatible with index signature. Type '{ listItem: string; data: string[]; }' is not assignable to type 'string | ScrapeOptionList | ScrapeOptionElement'. Type '{ listItem: string; data: string[]; }' has no properties in common with type 'ScrapeOptionElement'.

I'm using this package: Scrape-It

Upvotes: 3

Views: 1674

Answers (1)

Niladri
Niladri

Reputation: 5962

you are using the below method signature from Scrapeit library

declare function scrapeIt<T>(url: string | object, opts:scrapeIt.ScrapeOptions): Promise<T>;

which means the second parameter for the method scraptIt() should be of type ScrapeOptions. If you observe the definition of the interface ScrapeOptions carefully you can see that it accepts the below format as input 

export interface ScrapeOptions {
        [key: string]: string | ScrapeOptionList | ScrapeOptionElement;
}

The ScrapeOptionList interface is defined as 

export interface ScrapeOptionList {
        listItem: string;
        data: ScrapeOptions;
}

In your code you are passing the second parameter as below 

scraptIt(firebaseFunctions.config().sports.url + element.data().url, {
                sports: {
                    listItem: '.LSport',
                    data: ['b'] // here is the issue
                }
            })

the value for data should be of type ScrapeOptions as per the definition . Hence you need to change it to either a simple string or type of ScrapeOptionList or type of ScrapeOptionElement.

you can try to change it to data: 'b' as per your need Or set dataproperty value as type of ScrapeOptionList or ScrapeOptionElement.

a sample format to be used should look like below -- (Not sure why are you using data:['b']) . In my opinion it should be data : { "somekey" : 'b'}

pages: {
        listItem: "li.page"
      , name: "pages"
      , data: {
            title: "a"
          , url: {
                selector: "a"
              , attr: "href"
            }
        }
    }

Upvotes: 3

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