diff --git a/graphics/vega/Portfile b/graphics/vega/Portfile
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+# -*- coding: utf-8; mode: tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:ft=tcl:et:sw=4:ts=4:sts=4
+
+PortSystem          1.0
+PortGroup           npm 1.0
+
+name                vega
+version             6.2.0
+revision            0
+
+npm.rootname        vega-cli
+
+categories          graphics devel
+license             BSD
+maintainers         nomaintainer
+
+description         Vega visualization grammar: declarative interactive visualizations
+
+long_description    Vega is a visualization grammar, a declarative language for \
+                    creating, saving, and sharing interactive visualization designs. \
+                    With Vega, you can describe the visual appearance and interactive \
+                    behavior of a visualization in a JSON format, and generate \
+                    web-based views using Canvas or SVG. This port installs the Vega \
+                    command-line utilities (vg2png, vg2svg, vg2pdf) and the Vega \
+                    JavaScript library.
+
+homepage            https://vega.github.io/vega/
+
+checksums           rmd160  628ebd2ffc088f9eb97cc67b0acbd0bb01087383 \
+                    sha256  b6007efa43e3b8fe8d5ad941a4283affeec3f07770c1dcb4ed50cbe70dbce802 \
+                    size    4080
+
+platform darwin {
+    if {${os.major} >= 22} {
+        npm.nodejs_version  24
+        npm.version         11
+    }
+}
+
+destroot {
+    file mkdir ${workpath}/.home
+    system -W ${workpath} \
+        "HOME=${workpath}/.home \
+         ${prefix}/bin/npm install -ddd --global \
+         --prefix=${destroot}${prefix} \
+         --cache=${workpath}/.npm-cache \
+         ${distpath}/${distfiles}"
+
+    # Fix shebangs: npm writes #!/usr/bin/env node --- replace with
+    # the MacPorts-provided node binary
+    foreach f [glob -nocomplain ${destroot}${prefix}/lib/node_modules/vega-cli/bin/vg2*] {
+        reinplace "s|#!/usr/bin/env node|#!${prefix}/bin/node|g" ${f}
+    }
+
+    # npm bakes the destroot path into internal metadata files; strip it
+    foreach f {
+        lib/node_modules/.package-lock.json
+        lib/node_modules/vega-cli/package.json
+    } {
+        if {[file exists ${destroot}${prefix}/${f}]} {
+            reinplace -q "s|${destroot}||g" ${destroot}${prefix}/${f}
+        }
+    }
+}
+
+test.run    yes
+test {
+    # 1. Smoke test — vg2svg --help should exit cleanly
+    system "${destroot}${prefix}/bin/vg2svg --help"
+
+    # 2. Version check — the installed version must match the port
+    set vg2svg_out [exec ${destroot}${prefix}/bin/vg2svg --version]
+    if {![string match "*${version}*" $vg2svg_out]} {
+        return -code error "version mismatch: expected ${version}, got ${vg2svg_out}"
+    }
+
+    # 3. Functional test — render a minimal Vega spec to SVG
+    set spec_file [file join ${workpath} test-spec.vg.json]
+    set svg_file  [file join ${workpath} test-output.svg]
+    set fd [open ${spec_file} w]
+    puts $fd {
+        {
+            "$schema": "https://vega.github.io/schema/vega/v5.json",
+            "width": 200,
+            "height": 200,
+            "marks": [
+                {
+                    "type": "rect",
+                    "encode": {
+                        "enter": {
+                            "x":      {"value": 0},
+                            "y":      {"value": 0},
+                            "width":  {"value": 100},
+                            "height": {"value": 100},
+                            "fill":   {"value": "steelblue"}
+                        }
+                    }
+                }
+            ]
+        }
+    }
+    close $fd
+
+    system "${destroot}${prefix}/bin/vg2svg ${spec_file} ${svg_file}"
+
+    if {![file exists ${svg_file}]} {
+        return -code error "vg2svg failed to produce output SVG"
+    }
+
+    set svg_content [exec cat ${svg_file}]
+    if {![string match "*<svg*" $svg_content]} {
+        return -code error "vg2svg output does not appear to be valid SVG"
+    }
+}
+
+notes "The following Vega command-line utilities have been installed:
+
+    vg2svg --- render a Vega spec to SVG
+    vg2png --- render a Vega spec to PNG
+    vg2pdf --- render a Vega spec to PDF
+
+For documentation and examples, visit https://vega.github.io/vega/"