Unless the command for this is hidden from me, I cannot seem to find a solution to this age-old problem.

Where I work, I need the three following things to be true:
1) Create an SVG that preserves editing capabilities thereby eliminating the need for more than one file. So, only one SVG file, and not an AI + SVG file.
2) The fonts within that SVG must not break when displayed in a browser. The infamous "ArialMT" problem.
3) Must not require a find-and-replace action to correct the font after the export. All actions must be done in Illustrator.

There are currently two methods of export. Both have their pros and cons.

File > Save As:
Text and shapes are editable as expected; Styles are not separated into new layers.

File > Export > Export As:
Fonts render correctly in browser

Neither option above works for me. “Save As” preserves editing capabilities, but fonts break (“Arial” becomes “ArialMT”). Conversely, “Export As” renders fonts correctly (font-family: ArialMT, Arial;), but wrecks editability.

So I turned to Scripting (JS).

I can set all the ExportOptionsSVG() options I want. This includes:

 var svgSaveOpts = new ExportOptionsSVG();

 svgSaveOpts.preserveEditability = true;

However, fonts still break.

Next I targeted ArialMT fonts.

 var thisFont = app.activeDocument.textFrames[0].textRange.characterAttributes.textFont;    

 if(thisFont.name == 'ArialMT'){

      app.activeDocument.textFrames[0].textRange.characterAttributes.textFont = app.textFonts['Arial'];    // throws error

 }

"textFonts[]" only accepts the postscript name of the font, which is what “Arial” throws an error.

Is there a way to mimic the export method used in “Export As” which renders fonts correctly AND preserves editing capabilities?

I need to automate the language parameter from the Character panel on Illustrator. It is already available for most languages but it looks like the recent languages that have been added in Illustrator are not available for automation. We need to set this up to have the correct hyphenation in the text frames. For example, if we activate the hyphenation for illustrator files that contains Thai strings, it won’t hyphenate the strings correctly until we set the language.

The list available for automation can be found from the Illustrator scripting library on macOS (it contains everything we can use for automation with Illustrator).

You can find it if you follow these steps:
1/ Open Script Editor (installed by default on your Mac)
2/ CMD+SHIFT+L to open the Library
3/ Click on the + button and add Adobe Illustrator 2019 app (/Applications/Adobe\ Illustrator\ CC\ 2019/Adobe\ Illustrator.app/)
4/ Double click Adobe Illustrator 2019 to open the library
5/ Search for the language parameter in the library
6/ It will show the list available for automation (that is different from the list in the UI on Illustrator)

For example Thai, or Hebrew are missing for automation.

Hello Adobe,

I want to change the colormode of a swatch with javascript.
I do not want to change the document mode but I want to change specific swatches in my swatch library.

Now some of my swatches/colors are RGB spotcolors. I want to change them into CMYK spotcolor.

This is almost impossible now because spotColorKind is now read only :(

Now I have to:
- create new swatches with exactly the same colors and with different name
- attach new color to my pathitems
- delete old swatches
- rename swatches

I only wanted to change the colormode of the swatch......

Please make "simple" functions like this available. It would save a lot of code!