[fjakobs]

Stacked on #694 (base: victor-ditadi_data/typescript-7). Merge #694 first. This PR was originally a full TypeScript 7 migration; I rebuilt it on top of #694 and kept only what #694 doesn't do.

Changes

• Bump tsdown to 0.23.2 and drop chore: build and typecheck with TypeScript 7 #694's rolldown-plugin-dts patch. tsdown 0.23.2 ships rolldown-plugin-dts 0.29. Its tsgo generator emits declarations through the TypeScript Go API and honors the tsconfig's rootDir, which is what the patch fixed in 0.28.8.
  • Needs TypeScript 7.1 for .d.ts emit. That API (getDeclarationEmit) exists only in TypeScript 7.1, and 7.0.2 lacks it. The package configs select generator: "tsgo" and point tsgo.moduleUrl at a pinned typescript@7.1.0-beta. Everything else (tsc, typecheck, tests) stays on 7.0.2.
  • Separate workspace package. The beta lives in a private tools/typescript-next workspace package. As a root dependency, its tsc bin replaced 7.0.2's in node_modules/.bin.
  • dev-playground declares typescript 7.0.2 itself, so tsdown's optional typescript peer can't auto-resolve to the beta.
  • Same output. Across all 900 emitted .d.ts/JS files, the output matches chore: build and typecheck with TypeScript 7 #694's patched 0.23.1 build apart from the format of rolldown's region comments.
  • Follow-up: drop the alias when TypeScript 7.1.0 is stable.
• Strip JSDoc from the bundled JS. tsdown 0.23's rolldown keeps JSDoc comments in the JS output, which tsdown 0.20 dropped. All four package configs now set outputOptions: { comments: { jsdoc: false } }. Legal comments and @__PURE__ annotations stay, and the .d.ts files keep their JSDoc, so IDE hover docs are unchanged.
• tsdown deps options. The package configs move from the deprecated external/noExternal to deps.neverBundle/deps.alwaysBundle, which removes the deprecation warnings from the build. shared also drops skipNodeModulesBundle, which tsdown 0.23 ignores. appkitServerConfig still emits external, so apps scaffolded with tsdown 0.20 keep externalizing node_modules.
• fix(appkit): type the server plugin's exports(). The inferred return type references itself through extend(), so the published .d.ts elides it to any, on main and on chore: build and typecheck with TypeScript 7 #694. An explicit ServerExport interface fixes that.
• fix(playground): typecheck the client.
  • The client tsconfig now mirrors the Vite @databricks/appkit-ui alias. Without it, the client had 114 type errors.
  • Fixed the real errors this exposed: chart props renamed to smooth, showSymbol, showLabels and showArea, nullable chart rows, and the {} params fallback.
  • The playground check, which chore: build and typecheck with TypeScript 7 #694 runs in CI, now covers the client too.
• chore(playground): install the client with pnpm.
  • apps/dev-playground/client is a pnpm workspace member.
  • Removed: the npm package-lock.json of the client, dev-playground and clean-app, and the cd client && npm install hook.
  • deploy-playground.ts adds the hook back to the deployed copy, because Databricks Apps installs that copy with npm.
  • Root pnpm dev skips the client's standalone Vite server, which the playground doesn't use.
  • The client still resolves vite and its plugins to rolldown-vite 7.1.14.

Size

• Package JS. Measured before the restack, from packed tarballs installed into a template app: @databricks/appkit JS shrinks from 1,648,138 to 1,260,871 B raw (−24%) and from 586,659 to 419,159 B gzipped (−29%). @databricks/appkit-ui shrinks from 766,818 to 632,548 B raw (−18%). The code is unchanged: with comments stripped, the output is within about 0.4% of main. On this branch, shared/sql/helpers.js drops from 16 KB to 8 KB, with all 22 @example blocks still in its .d.ts.
• Template app client bundle. Unchanged, because Vite minifies it.
• Playground client. 0.4% smaller (raw and gzip), because pnpm shares one copy of @tanstack/table-core with appkit-ui instead of bundling two.

Test plan

• pnpm build with tsdown 0.23.2: no patch, no deprecation warnings, attw/publint clean, and every package emits types with TypeScript Go. pnpm docs:build
• tsc -v is 7.0.2 in the root and every workspace except docs (5.6.3) and tools/typescript-next
• pnpm typecheck, pnpm --filter=dev-playground check (server and client), typecheck:database
• pnpm check, pnpm knip, check:licenses
• pnpm test: 5,898 tests
• Client pnpm build. Client lint reports the same 12 pre-existing errors as chore: build and typecheck with TypeScript 7 #694; it isn't run in CI.
• This branch and chore: build and typecheck with TypeScript 7 #694 both merge cleanly into the latest main.

This pull request and its description were written by Isaac.

[github-actions]

📦 Bundle size report

Compared against bundle-size-baseline.json (main).

@databricks/appkit

npm tarball (packed): 1.1 MB (-138 KB) — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	982 KB (-308 KB)	326 KB (-131 KB)
Type declarations	465 KB (+1.4 KB)	167 KB (-896 B)
Source maps	2.5 MB (-23 KB)	841 KB (-15 KB)
Other	11 KB	3.7 KB
Total	3.9 MB (-330 KB)	1.3 MB (-147 KB)

Per-entry composition (own code — deps external (as shipped))

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
.	106 KB (+60 B)	2.5 KB (+1 B)	109 KB (+61 B)	external	344 KB (+245 B)
./beta	103 KB (+23 B)	648 B (+163 B)	103 KB (+186 B)	external	309 KB (+374 B)
./testing	45 KB	32 KB (+59 B)	77 KB (+59 B)	external	224 KB (+222 B)
./tsdown	520 B	0 B	520 B	external	813 B
./type-generator	26 KB (+40 B)	0 B	26 KB (+40 B)	external	75 KB (+110 B)

Chunks:

Entry	Chunk	Load	Size (gz)
.	index.js	initial	101 KB
.	utils.js	initial	4.6 KB
.	remote-tunnel-manager.js	lazy	2.5 KB
./beta	beta.js	initial	82 KB
./beta	modular.js	initial	6.0 KB
./beta	stream-manager.js	initial	5.9 KB
./beta	service-context.js	initial	4.5 KB
./beta	databricks.js	initial	3.3 KB
./beta	client.js	initial	648 B
./beta	index.js	initial	20 B
./beta	index.js	lazy	281 B
./beta	supervisor-api.js	lazy	191 B
./beta	databricks.js	lazy	176 B
./testing	manifest.js	initial	32 KB
./testing	index.js	initial	10 KB
./testing	wide-event-emitter.js	initial	2.9 KB
./testing	index.js	lazy	28 KB
./testing	remote-tunnel-manager.js	lazy	2.5 KB
./testing	utils.js	lazy	1.8 KB
./tsdown	index.js	initial	520 B
./type-generator	index.js	initial	26 KB

@databricks/appkit-ui

npm tarball (packed): 367 KB (-31 KB) — gzipped download (dist + bin; excludes release-only docs/NOTICE).

dist	raw	gzip
JS (runtime)	366 KB (-63 KB)	119 KB (-28 KB)
Type declarations	268 KB (+1.1 KB)	97 KB (-1.4 KB)
Source maps	828 KB (-25 KB)	280 KB (-5.3 KB)
CSS	16 KB	3.2 KB
Total	1.4 MB (-87 KB)	499 KB (-35 KB)

Per-entry composition (consumer bundle — deps bundled, peerDeps external)

Entry	Initial (gz)	Lazy (gz)	Total (gz)	node_modules (min)	Own code (min)
./js	5.3 KB (-2 B)	49 KB	55 KB (-2 B)	208 KB	14 KB (-8 B)
./js/beta	2.1 KB (+4 B)	0 B	2.1 KB (+4 B)	0 B	5.0 KB (+10 B)
./react	433 KB (+43 B)	49 KB	481 KB (+43 B)	1.3 MB	177 KB (+1 B)
./react/beta	4.9 KB (+9 B)	0 B	4.9 KB (+9 B)	0 B	12 KB (+19 B)

Chunks:

Entry	Chunk	Load	Size (gz)
./js	index.js	initial	5.2 KB
./js	chunk	initial	120 B
./js	apache-arrow	lazy	49 KB
./js/beta	beta.js	initial	2.1 KB
./react	index.js	initial	431 KB
./react	tslib	initial	2.1 KB
./react	apache-arrow	lazy	49 KB
./react/beta	beta.js	initial	4.9 KB

[github-actions]

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📦 Try this PR's app template

Scaffolds a new app from this PR's SDK build. Run it in any folder (requires the GitHub CLI — gh auth login — and the Databricks CLI):

gh run download 41643594434 -R databricks/appkit -n appkit-template-0.89.0-pr.aec5206-chore-typescript-7-701 -D appkit-pr-701 \
  && unzip -o "appkit-pr-701/appkit-template-0.89.0-pr.aec5206-chore-typescript-7-701.zip" -d "appkit-pr-701" \
  && databricks apps init --template "appkit-pr-701"

The template pins @databricks/appkit and @databricks/appkit-ui to tarballs built from this branch, so the scaffolded app runs against this PR's code.