Access to first index of an Split and later make another Split, throws the error "Object is possibly 'undefined'"

[RodrigoTomeES]

Bug Report

Hi,

I am triying to get the extension file inside of an URL like:

• https://example.com/folder/file.jpg: jpg
• https://example.com/fold.er/fil.e.jpg?param.eter#hash=12.345: jpg

🔎 Search Terms

Object is possibly 'undefined'
undefined

🕗 Version & Regression Information

• I tried it in 4.5.4 version

⏯ Playground Link

Playground link with relevant code

💻 Code

export const getUrlExtension = (url: string): string =>
  url.split(/[#?]/)[0].split('.').pop().trim();

🙁 Actual behavior

Throw this error: Object is possibly 'undefined'.

🙂 Expected behavior

Doesn't throw any error, I think that never can be undefined.

[MartinJohns]

Duplicate of #30406. You can use the non-null assertion operator for this case.

[RodrigoTomeES]

@MartinJohns thanks! and sorry to duplicate the issue but I didn't find it