http get https://cdn.jsdelivr.net/npm/vega@5.27.0 | save --force src/vega-all.js
http get https://cdn.jsdelivr.net/npm/vega-lite@5.17.0 | save --append src/vega-all.js
http get https://cdn.jsdelivr.net/npm/vega-embed@6.24.0 | save --append src/vega-all.js