Update to Typescript 6 / Jest 29

[alexdunae]

Prep for adding Stratakit components and general modernization.

Stratakit's optional render prop was being seen as required in TS 4, which is what prompted me to start this update.

• Update to Typescript 6 / Jest 29
• extracted a tsconfig.base.json to simplify config
• moved Jest TS config into jest.config.js - this lets us remove types: [node, jest] from the browser-targeting tsconfig files
• switched to moduleResolution: "bundler" since the previous node option is deprecated
• updated a few SVG imports to handle moduleResolution: "bundler"
• disabled Storybook's reactDogen for now (this shows TS types on Storybook) - it is not compatible with TS 6 but can be re-enabled when we update Storybook in Upgrade to Storybook 7 #108 - Storybook still shows props, just not with the full TS typings

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This PR is based on #203 so CI isn't running automatically. Here are the manual runs... https://github.com/iTwin/admin-components-react/actions?query=branch%3Aalex%2Ftypescript6

[veekeys]

What do you mean by "adding stratakit components"?
If you plan to replace whole iTwinUI with StrataKit, that cannot be done as these components are used in BIC.

[alexdunae]

What do you mean by "adding stratakit components"? If you plan to replace whole iTwinUI with StrataKit, that cannot be done as these components are used in BIC.

The plan is to add MUI components in parallel to existing iTwinUI components. So consumers will be able to import something like @itwin/admin-components-react/mui/iTwinGrid

[Copilot]

Pull request overview

Modernizes the repo tooling to unblock Stratakit integration by upgrading the TypeScript/Jest toolchain and aligning tsconfig/module resolution with TypeScript 6.

Changes:

• Upgraded to TypeScript 6.x, Jest 29.x, and ts-jest 29 across packages (plus related eslint/types updates).
• Extracted shared compiler settings into a new tsconfig.base.json and updated package-level tsconfigs to extend it (using moduleResolution: "bundler").
• Updated Jest configs to inline TS settings for tests and adjusted a few imports/settings for compatibility (e.g., icon imports; Storybook docgen disabled for TS6).

Reviewed changes

Copilot reviewed 29 out of 31 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tsconfig.json	Switches to extending the new shared base config; keeps outDir override.
tsconfig.base.json	New shared TS6 compiler configuration (target/lib/module/moduleResolution/etc.).
packages/modules/storybook-auth-addon/tsconfig.eslint.json	Adjusts eslint TS config to allow JS parsing.
packages/modules/storybook-auth-addon/package.json	Upgrades TypeScript + @typescript-eslint/* versions (but eslint range needs alignment).
packages/modules/manage-versions/tsconfig.json	Extends base config; sets rootDir/outDir and expands excludes.
packages/modules/manage-versions/package.json	Upgrades Jest/ts-jest/TypeScript/eslint toolchain deps.
packages/modules/manage-versions/jest.config.js	Moves ts-jest config inline (CommonJS + Node10 resolution + explicit types).
packages/modules/imodel-browser/tsconfig.json	Extends base config; sets rootDir/outDir and excludes tests/output dirs.
packages/modules/imodel-browser/package.json	Upgrades Jest/ts-jest/TypeScript/eslint toolchain deps.
packages/modules/imodel-browser/jest.config.js	Moves ts-jest config inline (CommonJS + Node10 resolution + explicit types).
packages/modules/delete-itwin/tsconfig.json	Extends base config; sets rootDir/outDir and excludes tests/output dirs.
packages/modules/delete-itwin/src/components/DeleteITwin.tsx	Updates icon import path for bundler-style resolution compatibility.
packages/modules/delete-itwin/package.json	Upgrades Jest/ts-jest/TypeScript/eslint toolchain deps.
packages/modules/delete-itwin/jest.config.js	Moves ts-jest config inline (CommonJS + Node10 resolution + explicit types).
packages/modules/delete-imodel/tsconfig.json	Extends base config; sets rootDir/outDir and excludes tests/output dirs.
packages/modules/delete-imodel/src/components/DeleteIModel.tsx	Updates icon import path for bundler-style resolution compatibility.
packages/modules/delete-imodel/package.json	Upgrades Jest/ts-jest/TypeScript/eslint toolchain deps.
packages/modules/delete-imodel/jest.config.js	Moves ts-jest config inline (CommonJS + Node10 resolution + explicit types).
packages/modules/create-imodel/tsconfig.json	Extends base config; sets rootDir/outDir and excludes tests/output dirs.
packages/modules/create-imodel/src/components/base-imodel/BaseIModel.tsx	Removes invalid nullish-coalescing pattern flagged by newer TS (keeps same runtime result).
packages/modules/create-imodel/package.json	Upgrades Jest/ts-jest/TypeScript/eslint toolchain deps.
packages/modules/create-imodel/jest.config.js	Moves ts-jest config inline (CommonJS + Node10 resolution + explicit types).
packages/apps/storybook/package.json	Adds TypeScript 6 and upgrades @typescript-eslint/* versions (but eslint range needs alignment).
packages/apps/storybook/.storybook/main.js	Disables reactDocgen due to Storybook 6 + TS6 incompatibility.
common/scripts/package.json	Upgrades TypeScript + @typescript-eslint/* versions (but eslint range needs alignment).
common/config/rush/pnpm-lock.yaml	Lockfile updates reflecting TypeScript/Jest/eslint ecosystem upgrades.
common/changes/@itwin/manage-versions-react/alex-typescript6_2026-05-13-20-55.json	Records a “none” change entry for the package upgrade work.
common/changes/@itwin/imodel-browser-react/alex-typescript6_2026-05-13-20-55.json	Records a “none” change entry for the package upgrade work.
common/changes/@itwin/delete-itwin-react/alex-typescript6_2026-05-13-20-55.json	Records a “none” change entry for the package upgrade work.
common/changes/@itwin/delete-imodel-react/alex-typescript6_2026-05-13-20-55.json	Records a “none” change entry for the package upgrade work.
common/changes/@itwin/create-imodel-react/alex-typescript6_2026-05-13-20-55.json	Records a “none” change entry for the package upgrade work.

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