monaco-editor breaking changes

0.56.0

141 breaking changes, first published July 20, 2026.

• Removed createWebWorker
  createWebWorker was removed in monaco-editor 0.56.0 npmjs.com
• Removed css
  css was removed in monaco-editor 0.56.0 npmjs.com
• Removed editor.IOverlayWidgetPosition.stackOridinal
  IOverlayWidgetPosition.stackOridinal was removed in monaco-editor 0.56.0 npmjs.com
• Removed html
  html was removed in monaco-editor 0.56.0 npmjs.com
• Removed IWebWorkerOptions
  IWebWorkerOptions was removed in monaco-editor 0.56.0 npmjs.com
• Removed json
  json was removed in monaco-editor 0.56.0 npmjs.com
• Removed languages.InlineCompletionHint
  languages.InlineCompletionHint was removed in monaco-editor 0.56.0 npmjs.com
• Removed lsp
  lsp was removed in monaco-editor 0.56.0 npmjs.com
• Removed typescript
  typescript was removed in monaco-editor 0.56.0 npmjs.com
• Default changed
  The release sets auto reload to false by default. Code that relied on automatic reloading must now enable it explicitly. github.com

And 131 more in this version.

0.55.0

122 breaking changes, first published November 20, 2025.

• Removed editor.IWebWorkerOptions
  editor.IWebWorkerOptions was removed in monaco-editor 0.55.0 npmjs.com
• Removed languages.css.CSSDataConfiguration
  languages.css.CSSDataConfiguration was removed in monaco-editor 0.55.0 npmjs.com
• Removed languages.css.CSSDataV1
  languages.css.CSSDataV1 was removed in monaco-editor 0.55.0 npmjs.com
• Removed languages.css.cssDefaults
  languages.css.cssDefaults was removed in monaco-editor 0.55.0 npmjs.com
• Removed languages.css.CSSFormatConfiguration
  languages.css.CSSFormatConfiguration was removed in monaco-editor 0.55.0 npmjs.com
• Removed languages.css.DiagnosticsOptions
  languages.css.DiagnosticsOptions was removed in monaco-editor 0.55.0 npmjs.com
• Removed languages.css.EntryStatus
  languages.css.EntryStatus was removed in monaco-editor 0.55.0 npmjs.com
• Removed languages.css.IAtDirectiveData
  languages.css.IAtDirectiveData was removed in monaco-editor 0.55.0 npmjs.com
• Removed languages.css.IPropertyData
  languages.css.IPropertyData was removed in monaco-editor 0.55.0 npmjs.com
• Removed languages.css.IPseudoClassData
  languages.css.IPseudoClassData was removed in monaco-editor 0.55.0 npmjs.com

And 112 more in this version.

0.54.0

89 breaking changes, first published October 6, 2025.

• Removed MonacoEnvironment
  MonacoEnvironment was removed in monaco-editor 0.54.0 npmjs.com
• Signature changed editor.EditorOption.colorDecoratorsActivatedOn
  Was colorDecoratorsActivatedOn = 167; now colorDecoratorsActivatedOn = 168. npmjs.com
• Signature changed editor.EditorOption.defaultColorDecorators
  Was defaultColorDecorators = 166; now defaultColorDecorators = 167. npmjs.com
• Signature changed editor.EditorOption.definitionLinkOpensInPeek
  Was definitionLinkOpensInPeek = 100; now definitionLinkOpensInPeek = 101. npmjs.com
• Signature changed editor.EditorOption.editorClassName
  Was editorClassName = 161; now editorClassName = 162. npmjs.com
• Signature changed editor.EditorOption.effectiveAllowVariableFonts
  Was effectiveAllowVariableFonts = 171; now effectiveAllowVariableFonts = 172. npmjs.com
• Signature changed editor.EditorOption.effectiveCursorStyle
  Was effectiveCursorStyle = 160; now effectiveCursorStyle = 161. npmjs.com
• Signature changed editor.EditorOption.effectiveEditContext
  Was effectiveEditContext = 169; now effectiveEditContext = 170. npmjs.com
• Signature changed editor.EditorOption.inertialScroll
  Was inertialScroll = 157; now inertialScroll = 158. npmjs.com
• Signature changed editor.EditorOption.inlayHints
  Was inlayHints = 158; now inlayHints = 159. npmjs.com

And 79 more in this version.

0.54.0-dev-20250928

1 breaking change, first published October 6, 2025.

• Behavior changed
  The ESM build now adds .js extensions to its file names. Code that imports the ESM files by their extensionless paths may need to add the .js extension. github.com

0.54.0-dev-20250911

1 breaking change, first published October 6, 2025.

• Removed out.languages
  The out/languages output is no longer available, so code that imports from it will fail. Import the language modules from another path or entry point. github.com

Check your code

These are the changes. To see which of them reach your code, scan a public repository, or have your coding agent call check_code with your manifest or lockfile over MCP. The API reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys.