feat(plugin-import-export): adds new exportLimit, importLimit and per collection limit control

[paulpopus]

This PR adds exportLimit, importLimit and per collection limit control and fixes a few reported bugs around preview behaviour and data exports to CSV and expands the test coverage to all fields except uploads as those will be expanded upon in another PR. Some of these bugs are reported directly, not on Github.

New limits control

Adds new exportLimit, importLimit and per collection limit control so you can force a limit per user if necessary for how many documents can be exported or imported in a single operation. This allows you to prevent certain users from causing excessive server/resource usage.

The config can be added top level to affect all operations or you can override on a per collection and per operation level, defaults to 0 (unlimited).

importExportPlugin({
  exportLimit: ({ req }) => 500, // function with req
  importLimit: 100,  // hardcoded number
  collections: [
    {
      slug: 'posts',
      // per collection per operation overrides
      export: {
        limit: ({ req }) => 5,
      },
      import: {
        limit: 5,
      },
    },
  ],
}),

Bugs fixed:

• Timezones being wrongly exported without being selected (but date is selected)
• Timezones being duplicated when selected
• disableSave and format having no effect on the collection's export configuration

Chores:

• Removed an internal utility in favour of a payload/shared one
• Added new e2e tests for format
• Int tests for point, checkbox, select, radio, email, textarea and code

[github-actions]

📦 esbuild Bundle Analysis for payload

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This PR introduced no changes to the esbuild bundle! 🙌

[Copilot]

Pull request overview

This PR adds configurable limits for import and export operations to prevent excessive server resource usage, and fixes several bugs related to timezone handling, CSV export formatting, and configuration application. The limits can be set globally or per-collection and support dynamic functions based on request context.

Changes:

• Added exportLimit and importLimit configuration options (global and per-collection)
• Fixed timezone companion fields being incorrectly included in exports
• Fixed format and disableSave settings not being applied to collection export configurations
• Expanded test coverage for additional field types (checkbox, select, radio, email, textarea, code, point)

Reviewed changes

Copilot reviewed 85 out of 87 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/plugin-import-export/shared.ts	Added new collection slugs for testing limits and media uploads
test/plugin-import-export/seed/index.ts	Added seed data for new field types and media collection
test/plugin-import-export/payload-types.ts	Updated TypeScript types to include new collections, fields, and limit configurations
test/plugin-import-export/e2e.spec.ts	Added E2E tests for format enforcement, preview pagination, and limit enforcement
test/plugin-import-export/config.ts	Added configuration for timezone support and collections with limits
test/plugin-import-export/collections/PostsWithLimits.ts	Created new collection for testing limit enforcement
test/plugin-import-export/collections/Pages.ts	Added new field types for comprehensive testing
test/plugin-import-export/collections/Media.ts	Created media collection for upload field testing
packages/plugin-import-export/src/utilities/unflattenObject.ts	Improved code clarity with better variable naming and documentation
packages/plugin-import-export/src/utilities/resolveLimit.ts	New utility to resolve limit values (numbers or functions)
packages/plugin-import-export/src/utilities/parseCSV.ts	Improved comment clarity for CSV parsing logic
packages/plugin-import-export/src/utilities/getvalueAtPath.ts	Removed internal utility in favor of shared Payload function
packages/plugin-import-export/src/utilities/getSchemaColumns.ts	Added timezone companion field filtering and improved column ordering logic
packages/plugin-import-export/src/utilities/getPluginCollections.ts	Fixed application of non-override collection settings to base collection
packages/plugin-import-export/src/utilities/getImportFieldFunctions.ts	Cleaned up comments for better code clarity
packages/plugin-import-export/src/utilities/getExportFieldFunctions.ts	Added special handling for date fields to prevent incorrect timezone field inclusion
packages/plugin-import-export/src/utilities/flattenObject.ts	Added timezone field filtering and optimized field selection logic
packages/plugin-import-export/src/utilities/fieldToRegex.ts	New utility to create regex patterns for field path matching
packages/plugin-import-export/src/utilities/fieldToRegex.spec.ts	Comprehensive tests for field path regex generation
packages/plugin-import-export/src/utilities/collectTimezoneCompanionFields.ts	New utility to identify auto-generated timezone companion fields
packages/plugin-import-export/src/utilities/collectTimezoneCompanionFields.spec.ts	Tests for timezone companion field collection
packages/plugin-import-export/src/utilities/buildDisabledFieldRegex.ts	Rewritten to properly handle field names with underscores and block slugs
packages/plugin-import-export/src/utilities/buildDisabledFieldRegex.spec.ts	Tests for disabled field regex generation
packages/plugin-import-export/src/types.ts	Added Limit and LimitFunction types for configurable limits
packages/plugin-import-export/src/translations/languages/*.ts	Added translations for limit-related messages in all supported languages
packages/plugin-import-export/src/index.ts	Added limit configuration storage in collection custom properties
packages/plugin-import-export/src/import/handlePreview.ts	Added max limit resolution and enforcement in preview
packages/plugin-import-export/src/import/getImportCollection.ts	Added limit resolution for synchronous and job-based imports
packages/plugin-import-export/src/import/getCreateImportCollectionTask.ts	Added maxLimit field to import task definition
packages/plugin-import-export/src/import/createImport.ts	Added limit enforcement before processing import documents
packages/plugin-import-export/src/import/batchProcessor.ts	Improved variable naming and documentation for batch import processing
packages/plugin-import-export/src/exports/types.ts	Exported Limit types for external use
packages/plugin-import-export/src/export/handlePreview.ts	Added limit enforcement in export preview with timezone field filtering
packages/plugin-import-export/src/export/handleDownload.ts	Added format validation and limit resolution for downloads
packages/plugin-import-export/src/export/getFields.ts	Changed format field to read-only when forced format is configured
packages/plugin-import-export/src/export/getExportCollection.ts	Added limit resolution for synchronous and job-based exports
packages/plugin-import-export/src/export/getCreateExportCollectionTask.ts	Added maxLimit field to export task definition
packages/plugin-import-export/src/export/createExport.ts	Added limit enforcement logic with timezone field filtering and BOM for CSV
packages/plugin-import-export/src/components/ImportPreview/index.tsx	Replaced internal utility with shared Payload function
packages/plugin-import-export/src/components/ExportPreview/index.tsx	Added UI display for limit warnings when user limit exceeds max
packages/plugin-import-export/src/components/ExportPreview/index.scss	Added styling for limit warning message
docs/plugins/import-export.mdx	Added documentation for limit configuration and usage

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