Deno seems to assume wrong return type (Puppeteer)

With the following code, I get an type error which I do not expect:

const element: ElementHandle | null = await page.$('span.label-status');
const shouldBeString: string = await element?.$eval('a', (el): string => el.innerText);

const element: ElementHandle | null = await page.$('span.label-status');
const shouldBeString: string = await element?.$eval('a', (el): string => el.innerText);

On the

shouldBeString

shouldBeString

I receive the following type error:

Type 'ElementHandle<any> | undefined' is not assignable to type 'string'.
  Type 'undefined' is not assignable to type 'string'.

Type 'ElementHandle<any> | undefined' is not assignable to type 'string'.
  Type 'undefined' is not assignable to type 'string'.

Even though

$eval()

$eval()

returns any type: https://pptr.dev/api/puppeteer.page._eval

Anyone have an idea how to fix this?

Page.$eval() method | Puppeteer

This method runs document.querySelector within the page and passes the result as the first argument to the pageFunction.

Deno•3y ago•

13 replies

Max van der Velde

Deno seems to assume wrong return type (Puppeteer)

With the following code, I get an type error which I do not expect:

const element: ElementHandle | null = await page.$('span.label-status');
const shouldBeString: string = await element?.$eval('a', (el): string => el.innerText);

const element: ElementHandle | null = await page.$('span.label-status');
const shouldBeString: string = await element?.$eval('a', (el): string => el.innerText);

On the

shouldBeString

shouldBeString

I receive the following type error:

Type 'ElementHandle<any> | undefined' is not assignable to type 'string'.
  Type 'undefined' is not assignable to type 'string'.

Type 'ElementHandle<any> | undefined' is not assignable to type 'string'.
  Type 'undefined' is not assignable to type 'string'.

Even though

$eval()

$eval()

returns any type: https://pptr.dev/api/puppeteer.page._eval

Anyone have an idea how to fix this?

Page.$eval() method | Puppeteer

This method runs document.querySelector within the page and passes the result as the first argument to the pageFunction.

Deno seems to assume wrong return type (Puppeteer)

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