We are planning to move all Vega packages to ESM only. Other packages like D3 have done this a while ago and it reduces future maintenance burden for us.

This will require a major release for all packages.

• Vega feat!: esm only #4018
• Vega-Lite feat!: esm only package vega-lite#9527
• Vega Embed feat!: esm only package vega-embed#1384
• Vega Tooltip feat!: switch to esm only vega-tooltip#1000
• Vega Themes feat!: esm only package vega-themes#651
• Vega Datasets feat!: switch to esm only vega-datasets#673
• ts-json-schema-generator

See https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c and d3/d3#3469.