When I execute a Format Document command on a Vue Component.vue file VSCode replace all single quoted string with double quoted string.
In my specific case
For projects that use .editorconfig file by default. The formatter will ignore the rules in the settings and use the rules in .editorconfig, then you can either:
.editorconfig file, and use your VSCode settings.quote_type = single to the .editorconfig file regarding your file type. You can also set quote_type value to double or auto.