• Open vscode
• Right click on src
• Choose Find in Folder
• this used to pop up the search viewlet with ./src in the files to include. It used to be able for me to append /**/*.ts to that value (i.e. ./src/**/*.ts) to search only in TypeScript files.
• this is no longer possible: /Users/alex/src/vscode/src/**/*.ts never finds anything
• please note that I do not have multiple folders opened

1.13:

Code - Insiders 1.14.0-insider (63def6e, 2017-06-28T05:07:46.148Z):