Remove eslint-config-react-app

[alexdunae]

It is pinned to @typescript-eslint/parser 5.x and blocks us from upgrading Typescript (which I'm hoping to do in #202).

The whole CRA project is deprecated anyways

https://github.com/react/create-react-app/blob/main/packages/eslint-config-react-app/package.json

We also remove eslint-plugin-flowtype since we don't use Flow at all

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I copied in the rules from CRA with a few exceptions...

Already in plugin:react/recommended...

react/jsx-no-comment-textnodes, react/jsx-no-duplicate-props, react/jsx-no-target-blank, react/jsx-no-undef, react/no-danger-with-children, react/no-direct-mutation-state, react/no-is-mounted, react/require-render-return

Handled by Typescript...

no-const-assign, no-dupe-args, no-dupe-class-members, no-dupe-keys, no-func-assign, no-new-symbol, no-obj-calls, no-this-before-super, no-undef, no-unreachable, valid-typeof, getter-return

Handled by Prettier...

dot-location, no-mixed-operators, no-whitespace-before-property, rest-spread-spacing, unicode-bom

Specific to create-react-app

no-restricted-properties, no-restricted-globals

[Copilot]

Pull request overview

This PR removes direct eslint-config-react-app and Flow lint dependencies, replacing the shared TypeScript ESLint base config’s CRA extension with explicit equivalent rules so TypeScript upgrades are less constrained.

Changes:

• Removed eslint-config-react-app and eslint-plugin-flowtype from package dev dependencies and the Rush pnpm lockfile.
• Added explicit React, React Hooks, import, accessibility, JavaScript, and TypeScript lint rules to the shared ESLint base config.
• Added change files for published React module packages.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
common/scripts/.eslintrc.ts.base.json	Replaces the CRA ESLint extension with explicit plugin entries and lint rules.
common/scripts/package.json	Removes direct CRA/Flow lint dependencies from shared scripts.
common/config/rush/pnpm-lock.yaml	Updates locked dependencies after removing direct CRA/Flow lint packages.
packages/apps/storybook/package.json	Removes direct CRA/Flow lint dependencies from Storybook app dev dependencies.
packages/modules/create-imodel/package.json	Removes direct CRA/Flow lint dependencies.
packages/modules/delete-imodel/package.json	Removes direct CRA/Flow lint dependencies.
packages/modules/delete-itwin/package.json	Removes direct CRA/Flow lint dependencies.
packages/modules/imodel-browser/package.json	Removes direct CRA/Flow lint dependencies.
packages/modules/manage-versions/package.json	Removes direct CRA/Flow lint dependencies.
packages/modules/storybook-auth-addon/package.json	Removes direct CRA/Flow lint dependencies.
common/changes/@itwin/create-imodel-react/alex-eslint-cra_2026-05-15-16-23.json	Adds a patch change entry for the package.
common/changes/@itwin/delete-imodel-react/alex-eslint-cra_2026-05-15-16-23.json	Adds a patch change entry for the package.
common/changes/@itwin/delete-itwin-react/alex-eslint-cra_2026-05-15-16-23.json	Adds a patch change entry for the package.
common/changes/@itwin/imodel-browser-react/alex-eslint-cra_2026-05-15-16-23.json	Adds a patch change entry for the package.
common/changes/@itwin/manage-versions-react/alex-eslint-cra_2026-05-15-16-23.json	Adds a patch change entry for the package.

Files not reviewed (1)

• common/config/rush/pnpm-lock.yaml: Language not supported

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