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-front/src/modules/workflow/workflow-diagram/components/WorkflowDiagramCreateStepElement.tsx

@@ -4,6 +4,7 @@ import { useStartNodeCreation } from '@/workflow/workflow-diagram/hooks/useStart
 import { type WorkflowDiagramStepNodeData } from '@/workflow/workflow-diagram/types/WorkflowDiagram';
 import { styled } from '@linaria/react';
 import { t } from '@lingui/core/macro';
+import { isDefined } from 'twenty-shared/utils';
 import { IconPlus } from 'twenty-ui/display';
 import { IconButton } from 'twenty-ui/input';
 
@@ -53,7 +54,7 @@ export const WorkflowDiagramCreateStepElement = ({
         <WorkflowDiagramConnector />
       </StyledVerticalLineContainer>
 
-      {Label && <StyledLabelContainer>{Label}</StyledLabelContainer>}
+      {isDefined(Label) && <StyledLabelContainer>{Label}</StyledLabelContainer>}
 
       <IconButton
         Icon={IconPlus}

packages/twenty-front/src/modules/workflow/workflow-diagram/workflow-nodes/components/WorkflowDiagramHandleSource.tsx

@@ -72,7 +72,7 @@ export const WorkflowDiagramHandleSource = ({
   const dynamicStyles = useMemo(() => {
     const isRight = position === Position.Right;
     const transform = isRight ? 'translate(50%, -50%)' : 'translate(-50%, 50%)';
-    // eslint-disable-next-line lingui/no-unlocalized-strings
+    // oxlint-disable-next-line lingui/no-unlocalized-strings
     const transformOrigin = isRight ? 'top right' : 'bottom left';
 
     let bg: string;

packages/twenty-front/src/modules/workflow/workflow-steps/filters/components/WorkflowStepFilterValueInput.tsx

@@ -116,7 +116,7 @@ export const WorkflowStepFilterValueInput = ({
   const isDisabled = !stepFilter.operand;
 
   const operandHasNoInput =
-    (stepFilter && !configurableViewFilterOperands.has(stepFilter.operand)) ??
+    (isDefined(stepFilter) && !configurableViewFilterOperands.has(stepFilter.operand)) ??
     true;
 
   const {

packages/twenty-front/src/modules/workflow/workflow-trigger/components/WorkflowEditTriggerDatabaseEventForm.tsx

@@ -144,7 +144,7 @@ export const WorkflowEditTriggerDatabaseEventForm = ({
       ...trigger,
       settings: {
         ...trigger.settings,
-        fields: fields ? (Array.isArray(fields) ? fields : [fields]) : null,
+        fields: isDefined(fields) ? (Array.isArray(fields) ? fields : [fields]) : null,
       },
     });
   };

packages/twenty-front/src/modules/workflow/workflow-trigger/components/WorkflowEditTriggerManual.tsx

@@ -1,3 +1,4 @@
+import { isDefined } from 'twenty-shared/utils';
 import { useFilteredObjectMetadataItems } from '@/object-metadata/hooks/useFilteredObjectMetadataItems';
 import { IconPicker } from '@/ui/input/components/IconPicker';
 import { Select } from '@/ui/input/components/Select';
@@ -120,7 +121,7 @@ export const WorkflowEditTriggerManual = ({
             options={availableMetadata}
             disabled={triggerOptions.readonly}
             onChange={(objectNameSingular) => {
-              if (triggerOptions.readonly === true || !availability) {
+              if (triggerOptions.readonly === true || !isDefined(availability)) {
                 return;
               }
 

packages/twenty-front/src/modules/workflow/workflow-variables/types/guards/isCodeOutputSchema.ts

@@ -7,7 +7,7 @@ import { type OutputSchemaV2 } from '@/workflow/workflow-variables/types/StepOut
 
 export const isCodeOutputSchema = (
   stepType: WorkflowActionType | WorkflowTriggerType,
-  schema: OutputSchemaV2,
-): schema is CodeOutputSchema => {
+  _schema: OutputSchemaV2,
+): _schema is CodeOutputSchema => {
   return stepType === 'CODE';
 };

packages/twenty-front/src/modules/workflow/workflow-variables/types/guards/isDatabaseEventTriggerOutputSchema.ts

@@ -7,7 +7,7 @@ import { type OutputSchemaV2 } from '@/workflow/workflow-variables/types/StepOut
 
 export const isDatabaseEventTriggerOutputSchema = (
   stepType: WorkflowActionType | WorkflowTriggerType,
-  schema: OutputSchemaV2,
-): schema is DatabaseEventTriggerOutputSchema => {
+  _schema: OutputSchemaV2,
+): _schema is DatabaseEventTriggerOutputSchema => {
   return stepType === 'DATABASE_EVENT';
 };

packages/twenty-front/src/modules/workflow/workflow-variables/types/guards/isFindRecordsOutputSchema.ts

@@ -7,7 +7,7 @@ import { type OutputSchemaV2 } from '@/workflow/workflow-variables/types/StepOut
 
 export const isFindRecordsOutputSchema = (
   stepType: WorkflowActionType | WorkflowTriggerType,
-  schema: OutputSchemaV2,
-): schema is FindRecordsOutputSchema => {
+  _schema: OutputSchemaV2,
+): _schema is FindRecordsOutputSchema => {
   return stepType === 'FIND_RECORDS';
 };

packages/twenty-front/src/modules/workflow/workflow-variables/types/guards/isFormOutputSchema.ts

@@ -7,7 +7,7 @@ import { type OutputSchemaV2 } from '@/workflow/workflow-variables/types/StepOut
 
 export const isFormOutputSchema = (
   stepType: WorkflowActionType | WorkflowTriggerType,
-  schema: OutputSchemaV2,
-): schema is FormOutputSchema => {
+  _schema: OutputSchemaV2,
+): _schema is FormOutputSchema => {
   return stepType === 'FORM';
 };

packages/twenty-front/src/modules/workflow/workflow-variables/types/guards/isIteratorOutputSchema.ts

@@ -7,7 +7,7 @@ import { type IteratorOutputSchema } from '@/workflow/workflow-variables/types/I
 
 export const isIteratorOutputSchema = (
   stepType: WorkflowActionType | WorkflowTriggerType,
-  schema: OutputSchemaV2,
-): schema is IteratorOutputSchema => {
+  _schema: OutputSchemaV2,
+): _schema is IteratorOutputSchema => {
   return stepType === 'ITERATOR';
 };

packages/twenty-front/src/modules/workflow/workflow-variables/types/guards/isManualTriggerOutputSchema.ts

@@ -7,7 +7,7 @@ import { type OutputSchemaV2 } from '@/workflow/workflow-variables/types/StepOut
 
 export const isManualTriggerOutputSchema = (
   stepType: WorkflowActionType | WorkflowTriggerType,
-  schema: OutputSchemaV2,
-): schema is ManualTriggerOutputSchema => {
+  _schema: OutputSchemaV2,
+): _schema is ManualTriggerOutputSchema => {
   return stepType === 'MANUAL';
 };

packages/twenty-front/src/modules/workflow/workflow-variables/types/guards/isRecordStepOutputSchema.ts

@@ -14,7 +14,7 @@ const RECORD_STEP_TYPES = [
 
 export const isRecordStepOutputSchema = (
   stepType: WorkflowActionType | WorkflowTriggerType,
-  schema: OutputSchemaV2,
-): schema is RecordActionOutputSchema => {
+  _schema: OutputSchemaV2,
+): _schema is RecordActionOutputSchema => {
   return RECORD_STEP_TYPES.includes(stepType);
 };