Migrate from ESLint to OxLint (#18443)

## Summary

Fully replaces ESLint with OxLint across the entire monorepo:

- **Replaced all ESLint configs** (`eslint.config.mjs`) with OxLint
configs (`.oxlintrc.json`) for every package: `twenty-front`,
`twenty-server`, `twenty-emails`, `twenty-ui`, `twenty-shared`,
`twenty-sdk`, `twenty-zapier`, `twenty-docs`, `twenty-website`,
`twenty-apps/*`, `create-twenty-app`
- **Migrated custom lint rules** from ESLint plugin format to OxLint JS
plugin system (`@oxlint/plugins`), including
`styled-components-prefixed-with-styled`, `no-hardcoded-colors`,
`sort-css-properties-alphabetically`,
`graphql-resolvers-should-be-guarded`,
`rest-api-methods-should-be-guarded`, `max-consts-per-file`, and
Jotai-related rules
- **Migrated custom rule tests** from ESLint `RuleTester` + Jest to
`oxlint/plugins-dev` `RuleTester` + Vitest
- **Removed all ESLint dependencies** from `package.json` files and
regenerated lockfiles
- **Updated Nx targets** (`lint`, `lint:diff-with-main`, `fmt`) in
`nx.json` and per-project `project.json` to use `oxlint` commands with
proper `dependsOn` for plugin builds
- **Updated CI workflows** (`.github/workflows/ci-*.yaml`) — no more
ESLint executor
- **Updated IDE setup**: replaced `dbaeumer.vscode-eslint` with
`oxc.oxc-vscode` extension, configured `source.fixAll.oxc` and
format-on-save with Prettier
- **Replaced all `eslint-disable` comments** with `oxlint-disable`
equivalents across the codebase
- **Updated docs** (`twenty-docs`) to reference OxLint instead of ESLint
- **Renamed** `twenty-eslint-rules` package to `twenty-oxlint-rules`

### Temporarily disabled rules (tracked in `OXLINT_MIGRATION_TODO.md`)

| Rule | Package | Violations | Auto-fixable |
|------|---------|-----------|-------------|
| `twenty/sort-css-properties-alphabetically` | twenty-front | 578 | Yes
|
| `typescript/consistent-type-imports` | twenty-server | 3814 | Yes |
| `twenty/max-consts-per-file` | twenty-server | 94 | No |

### Dropped plugins (no OxLint equivalent)

`eslint-plugin-project-structure`, `lingui/*`, `@stylistic/*`,
`import/order`, `prefer-arrow/prefer-arrow-functions`,
`eslint-plugin-mdx`, `@next/eslint-plugin-next`,
`eslint-plugin-storybook`, `eslint-plugin-react-refresh`. Partial
coverage for `jsx-a11y` and `unused-imports`.

### Additional fixes (pre-existing issues exposed by merge)

- Fixed `EmailThreadPreview.tsx` broken import from main rename
(`useOpenEmailThreadInSidePanel`)
- Restored truthiness guard in `getActivityTargetObjectRecords.ts`
- Fixed `AgentTurnResolver` return types to match entity (virtual
`fileMediaType`/`fileUrl` are resolved via `@ResolveField()`)

## Test plan

- [x] `npx nx lint twenty-front` passes
- [x] `npx nx lint twenty-server` passes
- [x] `npx nx lint twenty-docs` passes
- [x] Custom oxlint rules validated with Vitest: `npx nx test
twenty-oxlint-rules`
- [x] `npx nx typecheck twenty-front` passes
- [x] `npx nx typecheck twenty-server` passes
- [x] CI workflows trigger correctly with `dependsOn:
["twenty-oxlint-rules:build"]`
- [x] IDE linting works with `oxc.oxc-vscode` extension

packages/twenty-server/src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/__tests__/extract-jsonb-properties.type-test.ts

@@ -3,7 +3,7 @@ import { type Equal, type Expect } from 'twenty-shared/testing';
 import { type ExtractJsonbProperties } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/extract-jsonb-properties.type';
 import { type JsonbProperty } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/jsonb-property.type';
 
-// eslint-disable-next-line @typescript-eslint/no-empty-object-type
+// oxlint-disable-next-line @typescripttypescript/no-empty-object-type
 type EmptyObject = {};
 
 type TestedRecord = {
@@ -41,7 +41,7 @@ type TestedRecord = {
 
 type TestResult = ExtractJsonbProperties<TestedRecord>;
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type Assertions = [
   Expect<
     Equal<

packages/twenty-server/src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/__tests__/format-record-serialized-relation-properties.test-type.ts

@@ -18,7 +18,7 @@ type ObjectWithoutRelation = {
 
 type BrandedObjectWithRelation = JsonbProperty<ObjectWithRelation>;
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type ObjectAssertions = [
   // Object with SerializedRelation: Id suffix renamed to UniversalIdentifier, value becomes nullable
   Expect<
@@ -52,7 +52,7 @@ type ObjectAssertions = [
   >,
 ];
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type PrimitiveAssertions = [
   // Primitives pass through unchanged
   Expect<Equal<FormatRecordSerializedRelationProperties<string>, string>>,
@@ -67,7 +67,7 @@ type PrimitiveAssertions = [
   >,
 ];
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type ArrayAssertions = [
   // Array of objects with relation: transforms each element
   Expect<
@@ -103,7 +103,7 @@ type ArrayAssertions = [
   >,
 ];
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type UnionAssertions = [
   // Union with null: transforms object, keeps null
   Expect<
@@ -135,7 +135,7 @@ type MultipleRelationsObject = {
   regularId: string;
 };
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type MultipleRelationsAssertions = [
   // Multiple SerializedRelation properties: all get renamed and become nullable
   Expect<
@@ -190,7 +190,7 @@ type NestedWithArrayOfObjects = {
   }[];
 };
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type NestedObjectAssertions = [
   // Simple nested object: transforms relation inside nested object
   Expect<
@@ -279,7 +279,7 @@ type JsonSchemaUnion =
 
 type BrandedJsonSchemaUnion = JsonbProperty<JsonSchemaUnion>;
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type RecordPropertyAssertions = [
   // Object with 'properties' key containing Record<string, X>:
   // The 'properties' key should NOT be renamed to 'propertiesUniversalIdentifier'

packages/twenty-server/src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/__tests__/jsonb-property.type-test.ts

@@ -5,14 +5,14 @@ import {
   type JsonbProperty,
 } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/jsonb-property.type';
 
-// eslint-disable-next-line @typescript-eslint/no-empty-object-type
+// oxlint-disable-next-line @typescripttypescript/no-empty-object-type
 type EmptyObject = {};
 
 type SimpleObject = { value: string };
 
 type NestedObject = { nested: { deep: number } };
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type PrimitiveAssertions = [
   // Primitives pass through unchanged (not objects)
   Expect<Equal<JsonbProperty<string>, string>>,
@@ -22,7 +22,7 @@ type PrimitiveAssertions = [
   Expect<Equal<JsonbProperty<undefined>, undefined>>,
 ];
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type ObjectAssertions = [
   // Objects get branded
   Expect<
@@ -45,7 +45,7 @@ type ObjectAssertions = [
   >,
 ];
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type ArrayAssertions = [
   // Arrays are objects, so they get branded on the array itself
   Expect<
@@ -68,7 +68,7 @@ type ArrayAssertions = [
   >,
 ];
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type UnionAssertions = [
   // Union of object and null: object gets branded, null passes through
   Expect<

packages/twenty-server/src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/__tests__/metadata-universal-flat-entity-maps.type-test.ts

@@ -4,7 +4,7 @@ import { type MetadataUniversalFlatEntityMaps } from 'src/engine/workspace-manag
 import { type UniversalFlatFieldMetadata } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-field-metadata.type';
 import { type UniversalFlatViewField } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-view-field.type';
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type Assertions = [
   Expect<
     Equal<

packages/twenty-server/src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/__tests__/universal-flat-entity-update.test-type.ts

@@ -2,7 +2,7 @@ import { type Equal, type Expect } from 'twenty-shared/testing';
 
 import { type UniversalFlatEntityUpdate } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-entity-update.type';
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type Assertions = [
   Expect<
     Equal<

packages/twenty-server/src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/__tests__/universal-flat-field-metadata.test-type.ts

@@ -43,7 +43,7 @@ type OneToManyUniversalIdentifierArrays = {
 };
 
 // Narrowed relation universal identifier assertions - verifies conditional typing is preserved
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type RelationUniversalIdentifierAssertions = [
   // Non-relation types have undefined relation universal identifiers
   Expect<
@@ -76,7 +76,7 @@ type RelationUniversalIdentifierAssertions = [
   >,
 ];
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type UniversalFlatTransformationAssertions = [
   Expect<
     HasAllProperties<UniversalFlatFieldMetadata, DatePropertiesCastToString>
@@ -131,7 +131,7 @@ type SettingsExpectedResult =
     }
   | null;
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type Assertions = [
   Expect<Equal<SettingsTestCase, SettingsExpectedResult>>,
   Expect<Equal<NarrowedTestCase, NarrowedExpectedResult>>,

packages/twenty-server/src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/metadata-universal-flat-entity-properties-to-compare.type.ts

@@ -25,7 +25,7 @@ export type MetadataUniversalFlatEntityPropertiesToCompare<
 }[TComparedKeys] &
   keyof MetadataUniversalFlatEntity<T>;
 
-// eslint-disable-next-line unused-imports/no-unused-vars
+// oxlint-disable-next-line unused-imports/no-unused-vars
 type Assertions = [
   Expect<
     Equal<

packages/twenty-server/src/engine/workspace-manager/workspace-migration/workspace-migration-runner/exceptions/workspace-migration-runner.exception.ts

@@ -32,9 +32,9 @@ export type WorkspaceMigrationRunnerExecutionErrors = {
 };
 
 const {
-  // eslint-disable-next-line unused-imports/no-unused-vars
+  // oxlint-disable-next-line unused-imports/no-unused-vars
   EXECUTION_FAILED: WorkspaceMigrationRunnerExceptionExecutionFailedCode,
-  // eslint-disable-next-line unused-imports/no-unused-vars
+  // oxlint-disable-next-line unused-imports/no-unused-vars
   ...WorkspaceMigrationRunnerExceptionCodeOtherCode
 } = WorkspaceMigrationRunnerExceptionCode;
 

packages/twenty-server/src/engine/workspace-manager/workspace-migration/workspace-migration-runner/services/workspace-migration-runner.service.ts

@@ -257,7 +257,7 @@ export class WorkspaceMigrationRunnerService {
     } catch (error) {
       if (queryRunner.isTransactionActive) {
         await queryRunner.rollbackTransaction().catch((error) =>
-          // eslint-disable-next-line no-console
+          // oxlint-disable-next-line no-console
           console.trace(`Failed to rollback transaction: ${error.message}`),
         );
       }