Add Alt Text to charts

[yorch]

Alt text for charts is not currently populated, so it's not fully accesible. Adding a descr property to the charts translates to Alt Text box in PPT.

[gitbrent]

Thanks @yorch

[yorch]

@gitbrent awesome, thank you!

[yorch]

@gitbrent just realized that the commit with the change does not include altText support for images as I included in this PR (https://github.com/gitbrent/PptxGenJS/pull/848/files#diff-2e10387a0f5301958ef328618c21a1df1de827655aec5abbe99bf0ba59631f5dR1785-R1789). Is this is something you can include?
Thanks

[gitbrent]

@yorch - quite correct. I meant to modify the current alt text on Images, but i got distracted. It's always had an alt text value of the image path, so i've set to where it uses altText if provided, then the path if none.

[yorch]

@gitbrent great, thanks so much! looking forward for a new version :D

[yorch]

@gitbrent just saw a new version was released, thanks, been waiting for this new release for a while. Unfortunately, the TS definition for addImage is not correct, it's missing the altText option.

It's here:

PptxGenJS/src/core-interfaces.ts

Line 422 in 9e6aab8

export interface ImageProps extends PositionProps, DataOrPathProps {

But it's not here:

PptxGenJS/types/index.d.ts

Line 1241 in 9e6aab8

export interface ImageProps extends PositionProps, DataOrPathProps {

Thanks again

[gitbrent]

@yorch Oops! Thanks for letting me know. v3.7.1 has been released with altText included in the defs file.

[yorch]

@gitbrent thanks! much appreciated!