Converted files can be found in types-for-adobe repository.
Dump declaration files first and then:
# install package
npm i pravdomil/extendscript-xml-to-typescript -g
# convert JavaScript types
extendscript-xml-to-typescript "/Library/Application Support/Adobe/Scripting Dictionaries CC/CommonFiles/javascript.xml"
cat "/Library/Application Support/Adobe/Scripting Dictionaries CC/CommonFiles/javascript.d.ts"
# convert InDesign types
extendscript-xml-to-typescript "~/Library/Preferences/ExtendScript Toolkit/4.0/omv$indesign-11.064$11.3.xml"
cat "~/Library/Preferences/ExtendScript Toolkit/4.0/omv$indesign-11.064$11.3.d.ts"