feat: externalize jsx-runtime

[jackw]

What this PR does / why we need it:

The approaching move to React 19 in Grafana core codebase has highlighted an issue with plugins that are bundling react/jsx-runtime which expects a specific version of React as it uses the react internals API. This PR aims to address this with the following:

• bump grafanaDependency to 12.3.0 in plugin.json for new plugin scaffolds
• make react/jsx-runtime and react/jsx-dev-runtime externalised for new plugin scaffolds
• provide an addition codemod that plugin devs can run manually to externalize jsx-runtime for existing plugins

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Can be tested by using the canary release version from below like so npx @grafana/create-plugin@canary add externalize-jsx-runtime

📦 Published PR as canary version: Canary Versions

✨ Test out this PR locally via:

npm install website@5.5.0-canary.2448.21942905946.0
npm install @grafana/create-plugin@6.9.0-canary.2448.21942905946.0
# or 
yarn add website@5.5.0-canary.2448.21942905946.0
yarn add @grafana/create-plugin@6.9.0-canary.2448.21942905946.0

[github-actions]

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[Copilot]

Pull request overview

Updates @grafana/create-plugin scaffolds and tooling to avoid bundling react/jsx-runtime (and react/jsx-dev-runtime) so plugins don’t couple themselves to React internals as Grafana moves toward React 19.

Changes:

• Bump scaffolded plugins’ grafanaDependency to >=12.3.0 (app/panel/datasource/scenes-app templates).
• Externalize react/jsx-runtime and react/jsx-dev-runtime in the common bundler externals template.
• Add AST utilities + a new “externalize-jsx-runtime” addition codemod (with tests) to retrofit existing plugins.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
packages/create-plugin/templates/scenes-app/src/plugin.json	Bumps default Grafana dependency for new scenes-app scaffolds.
packages/create-plugin/templates/panel/src/plugin.json	Bumps default Grafana dependency for new panel scaffolds.
packages/create-plugin/templates/datasource/src/plugin.json	Bumps default Grafana dependency for new datasource scaffolds.
packages/create-plugin/templates/app/src/plugin.json	Bumps default Grafana dependency for new app scaffolds.
packages/create-plugin/templates/common/.config/bundler/externals.ts	Adds react/jsx-runtime and react/jsx-dev-runtime to scaffold externals list.
packages/create-plugin/src/codemods/utils.ts	Adds a helper to render template files for codemods (with optional warning injection).
packages/create-plugin/src/codemods/utils.ast.ts	Introduces reusable recast AST helpers for codemods.
packages/create-plugin/src/codemods/utils.ast.test.ts	Adds unit tests for the new AST helpers.
packages/create-plugin/src/codemods/additions/scripts/externalize-jsx-runtime.ts	New addition codemod to externalize jsx runtimes and adjust plugin.json ranges.
packages/create-plugin/src/codemods/additions/scripts/externalize-jsx-runtime.test.ts	Tests for the new addition codemod behavior and idempotency.

[hugohaggmark]

Did an initial pass and it looks good but I added some comments, I'm going to test this locally as well

[hugohaggmark]

Maybe nothing but I get this warning in the IDE

[hugohaggmark]

Awesome work 🚀

• tested on an existing rspack project
• tested on an existing webpack project