build: update to TypeScript 6 - #11588

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• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
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• All existing tests are passing: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/DevelopmentWorkflow.md#running-unit-tests-application.
• Tests for the changes are included - https://github.com/NativeScript/NativeScript/blob/master/tools/notes/WritingUnitTests.md.

What is the current behavior?

The workspace builds with TypeScript 5.9. Under TypeScript 6 the tsconfigs fail on deprecated options (baseUrl, target: es5), several configs lose their implicit @types, and core fails to build because of a side-effect import that can't be resolved.

What is the new behavior?

Everything builds with TypeScript 6.0.3. Deprecations are fixed rather than silenced: there is no ignoreDeprecations anywhere, and the old "5.0" escape hatch is removed too. strict stays off (set explicitly, since TS 6 turns it on by default).

Dependencies (build: update to TypeScript 6.0)

• typescript 6.0.3 at the root, in packages/webpack5, and in the test apps.
• Nx 22.5.4 → 22.7.12. Nx 22.5 depends on @phenomnomnominal/tsquery 6.1, which rejects TS 6. 22.7 stays on major 22, so @nativescript/nx@22 still fits.
• Angular dev tooling 21 → 22 and @analogjs/vite-plugin-angular 2.1.3 → 2.9.2. @angular/build@21 caps TS below 6.0. @nativescript/vite already lists ^22 as a peer.
• typescript-eslint 8.72, ts-jest 29.4.15, typedoc 0.28.20, ts-patch 4 (the first versions that accept TS 6).
• Applied the @nx/vitest 22.6 reportsDirectory migration.
• vite: require.resolve of its own HMR client files now uses relative paths. This fixes the stricter @nx/enforce-module-boundaries check in Nx 22.7. The exports map is identity, and I checked that both forms resolve to the same file in dist.
• Removed 15 stale extraneous entries from package-lock.json (apps/*, dist/*, packages/*). They pinned Angular 21 and blocked resolution.

tsconfigs (build: migrate tsconfigs off options deprecated in TypeScript 6)

• baseUrl removed everywhere. paths entries are now ./-relative to the tsconfig that declares them.
• target: es5 in the tools configs is replaced by the workspace ES2020 target.
• strict: false is set explicitly, and types is listed explicitly where configs relied on implicit @types (webpack5 jest/node, devtools node).
• typedoc config: it now inherits module/lib from the base config. On 5.9 it stopped at a config error (TS5095); typedoc --emit none now reports 0 errors.

Declarations (fix(core): declarations compatible with TypeScript 6)

• module Foo {} → namespace Foo {} in hand-written declarations (global-types.d.ts, interop.d.ts, org.nativescript.widgets.d.ts, android-declarations.d.ts). TS 6 makes this an error. In .d.ts files it only shows up with skipLibCheck: false, so consumers who check lib files would hit it.
• New debugger/webinspector-network.d.ts. The module only has .ios/.android files, so import './debugger/webinspector-network' failed under TS 6's default noUncheckedSideEffectImports.
• global-types.d.ts used import('data/observable'), which only resolved through baseUrl. It is now relative.

NativeClass (fix(webpack,vite): strip the "use strict" prologue…)

• TS 6 always emits "use strict" when transpiling a snippet that has no imports or exports. The NativeClass ES5 downlevel splices that output into the host module. All five transpile sites now strip the prologue. Output is otherwise byte-identical to 5.9. (moduleDetection: force was rejected because it appends export {}, which is invalid where the webpack transformer splices into blocks.)

Verification

• nx run-many -t build -p core,webpack5,vite: passes. The core dist still has __extends NativeClass output and no stray "use strict".
• tsc --noEmit across all 17 tsconfigs: same as the TS 5.9 baseline on main or better. The remaining errors exist on main too (spec configs, apps without installed deps).
• Tests: core 565 passed. webpack5 has 16 failures and vite has 5. Both match main exactly: the webpack5 snapshots hard-code /Users/nstudio/... paths, and vite's typescript-optional.spec passes when run alone.
• Lint: identical to main (the same 3 pre-existing vite errors).

Known follow-ups (not in this PR)

• Generated Android typings: androidx-*.d.ts and android-platform-*.d.ts in types-android/types-minimal still use module org { … }, about 85k occurrences. This is the same TS 6 error, visible to consumers with skipLibCheck: false. It needs a mechanical conversion, ideally fixed in the typings generator, as a separate change.
• TypeScript 7: the NativeClass transformers still call transpileModule with target: ES5. TS 6 still supports this (it raises a deprecation diagnostic that these call sites don't report). TS 7 removes ES5 output, so that downlevel will need another approach before 7.
• @nx/eslint 22.x and the nativescript CLI ship their own nested TypeScript (5.9 / 5.7). That copy doesn't affect builds here.