The purpose is to record the configuration so that you can find it later.
I use VSCODE + IAR for development. Since iar is too slow to open, after this configuration, at least without opening the compiler, you can easily compile
However, vscode is not very stable, and the content of one file has been changed into other files at a time.
The vscode plugin personally feels that it is mainly iar for vscode, iar embedded workbench
Specific operation: create iar.json in the .vscode folder, other files are usually created automatically when opening the folder with iar project
{
"version": 1,
"path": "C:\\Program Files (x86)\\IAR Systems\\Embedded Workbench 8.2\\",
"project": "${workspaceFolder}\\ckz_gcode.ewp",
"config": "Debug",
"parallel" : true
}