FormEngine 10.0.0

July 3, 2026

Overview

FormEngine 10.0.0 removes deprecated component-metadata, validation, and RSuite picker APIs that have been marked for removal in earlier releases. German (de-DE) strings are retranslated across Core, Designer, and view packages, and LocalizationStore is split into smaller pieces so form switching does not leave stale locale data behind.

Monaco editors for computed properties and localization now keep keyboard focus inside editable regions. RSuite CSS was fixed so production builds can minify styles safely. Built-in validation now uses Zod 4.4.

Why update

• Remove deprecated APIs before the next major blocks you: Definer.preview, customPreview, the finite number validator, and inline on RsDatePickerProps / RsTimePickerProps are gone.
• Pick up new German (de-DE) strings in Designer and component packages.
• Switch forms without leftover localization and work against a smaller ILocalizationStore contract if you extend localization yourself.
• Type in constrained Monaco regions for computed properties and localization code without focus getting stuck in read-only areas.
• Get smaller CSS bundles now that Lightning CSS minification works for RSuite styles.

Key features

• Removed deprecated APIs for component metadata (Definer, Meta), number validation, and RSuite date/time pickers.
• Retranslated German (de-DE) locale files via localization.config.json.
• Reworked LocalizationStore and expanded ILocalizationStore.
• In-house constrained Monaco editing for computed properties and localization code fields.
• Fixed @font-face placement in RSuite CSS; Lightning CSS minification enabled in production builds.

Changelog

Breaking changes

• Removed Definer.preview and customPreview from DefinerData and Meta. You can no longer customize component palette previews through this API.
• Removed the deprecated inline property from RsDatePickerProps and RsTimePickerProps. The pickers now extend Omit<DatePickerProps, 'inline'> and the equivalent time-picker props without inline.
• Removed the deprecated finite number validation rule from the built-in Zod rule set. Remove finite from form JSON or replace it with integer or another number rule from Form validation.
• ILocalizationStore now requires value, engine, removeLocalization, removeLocalizationForType, hasLocalization, hasLanguage, and getLocalizationItemId. Custom implementations must type the type argument as LocalizationType in getLocalization and setLocalization.

Update instructions

Update all packages to version 10.0.0.

If your custom components still call Definer.preview or pass customPreview in DefinerData, delete those calls. They stopped doing anything in recent releases.

If form JSON still uses a finite validation rule on number fields, remove it or switch to a supported validator from Form validation.

If you implement ILocalizationStore yourself, match the current interface and use LocalizationType for the type parameter.

Standard Designer and Viewer integrations need no other changes.

Features

• Added isBoolean and isDate utility exports from @react-form-builder/core.

Enhancements

• Retranslated German (de-DE) locale bundles across Core, Designer, and view packages using the new translation workflow.
• Split responsibilities in LocalizationStore and FluentLocalizationEngine for language resolution, bundle creation, and store state.
• Replaced the third-party Monaco constrained-editor plugin with an in-house setup for computed-property and localization code editors.
• Upgraded built-in Zod to ^4.4.3 and kept legacy date boundary error messages when Zod 4.3+ reports timestamp-based date issues.
• Enabled Lightning CSS minification for production CSS builds after fixing RSuite stylesheet structure.
• Release scripts now refresh public and private package.json variants automatically during release prep.

Bug fixes

• Localization from a previously opened form no longer sticks around after you switch to another form in the Designer or Viewer.
• Constrained Monaco editors accept keyboard input again when the caret lands in a read-only region; focus moves to the nearest editable range.
• Invalid nested @font-face rules in RSuite custom CSS no longer break CSS processors or block minification.

Resources

• ILocalizationStore API reference documents the expanded store contract.
• Computed properties is still the place to read about function-type calculated fields and the constrained code editor.

Security

• Bumped axios from 1.13.6 to 1.16.1 in examples.
• Bumped dompurify from 3.3.2 to 3.4.11 in examples.
• Bumped express, body-parser, and qs in examples.
• Bumped hono from 4.12.18 to 4.12.26 in examples.
• Bumped js-yaml from 4.1.0/4.1.1 to 4.3.0 in examples.
• Bumped multer from 2.1.1 to 2.2.0 in examples.
• Bumped @sigstore/core, @sigstore/verify, and sigstore in examples.
• Bumped shell-quote from 1.8.3 to 1.8.4 in examples.
• Bumped tmp from 0.2.5 to 0.2.7 in examples.
• Bumped vite and @vitejs/plugin-react-swc in examples.

Chore

• Bumped zod from ^4.0.0 to ^4.4.3.
• Bumped vitest, @vitest/browser, @vitest/browser-playwright, and @vitest/ui from 4.0.9 to 4.1.8.
• Bumped @angular/common, @angular/core, and @angular/compiler from 21.1.5 to 21.2.17 in examples.
• Bumped @remix-run/server-runtime, @remix-run/node, @remix-run/serve, @remix-run/dev, and react-router in examples.
• Bumped form-data from 4.0.5 to 4.0.6 in examples.
• Bumped launch-editor from 2.13.0 to 2.14.1 in examples.
• Bumped markdown-it from 14.1.1 to 14.2.0 in examples.
• Flattened the open-source monorepo layout (removed the intermediate src/ directory) and updated CI/build configuration accordingly.