I am using Visual Studio Code to learn PostScript language.

I use the following task.json to convert EPS to PDF.

{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "EPS",
            "command": "ps2pdf",
            "args": [
                "${file}"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "group": {
                "kind": "build",
                "isDefault": true
            }
        }
    ]
}

And my EPS is

%!PS-Adobe-3.0 EPSF-3.0
%%BoundingBox: 10 10 300 300

%%BeginProlog
/inch {72 mul} def
/cm {2.54 div inch} def
%%EndProlog


newpath
    1 cm 1 cm moveto
    9 cm 0 cm rlineto
    0 cm  9 cm rlineto
    -9 cm 0 cm rlineto
    9 cm 9 cm rlineto
closepath
5 setlinewidth
stroke
showpage
%%EOF

Question

How to automatically update a PDF viewed on the right whenever the corresponding EPS is changed on the left?