src/vs/base/common/extpath.ts/toPosixPath
export function toPosixPath(osPath: string) {
	if (osPath.indexOf('/') === -1) {
		osPath = toSlashes(osPath);
	}
	if (/^[a-zA-Z]:(\/|$)/.test(osPath)) { // starts with a drive letter
		osPath = '/' + osPath;
	}
	return osPath;
}