Issues

• Two regressions in 4.4.0 vs 4.3.1: parse time on unclosed calls and lost completion items for fragment-declared parameters

  eclipse-langium/langium#2236 · Filter by author StephanWald opened on Sep 29, 2026
  1

• Perf: linkContentToContainer and assignMandatoryProperties and getChecks

  eclipse-langium/langium#2233 · Filter by author cdietrich opened on Sep 22, 2026
  1

• Inconsistent generation of optional properties

  Bug

  eclipse-langium/langium#2228 · Filter by author anderay opened on Sep 15, 2026
  2

• Problems with keywords and terminals using u/s regex flags

  parser
  Bug

  eclipse-langium/langium#2225 · Filter by author hallvard opened on Sep 10, 2026
  1

• Data type rule with single terminal and different return types: Mismatch between inferred AST feature types and runtime behavior

  Bug

  eclipse-langium/langium#2201 · Filter by author blutorange opened on Aug 8, 2026

• ValidationAcceptor + MarkupContent

  Feature

  eclipse-langium/langium#2170 · Filter by author cdietrich opened on Jun 15, 2026
  3

• [arithmetics example] incorrect evaluation when number is used as a function

  examples
  Bug

  eclipse-langium/langium#2167 · Filter by author sorawee opened on Jun 11, 2026
  3

• Langium 4.x does not support two-phase code lens resolution

  Feature

  eclipse-langium/langium#2051 · Filter by author johnholliday opened on Oct 2, 2025
  1

• Generate more const in ast.ts

  Feature

  eclipse-langium/langium#2045 · Filter by author cdietrich opened on Sep 25, 2025
  1

• Internationalize user facing errors

  eclipse-langium/langium#2040 · Filter by author jmenzies12 opened on Sep 22, 2025

• MultiRef support missing in the hydrator

  Bug

  eclipse-langium/langium#2037 · Filter by author JohannesMeierSE opened on Sep 18, 2025

• The ReferenceInfo.index is always missing from the completion provider

  completion
  Bug

  eclipse-langium/langium#2026 · Filter by author raylras opened on Sep 6, 2025

• Completions should be prevented for single-line comments

  completion
  Bug

  eclipse-langium/langium#2016 · Filter by author dalyIsaac opened on Aug 28, 2025

• A "too specific" type gets inferred for a field in a TypeScript interface when using tree-rewriting actions

  Bug

  eclipse-langium/langium#2004 · Filter by author haukepribnow opened on Aug 15, 2025
  1

• Importing the same file twice breaks the parser

  parser
  Bug

  eclipse-langium/langium#1971 · Filter by author svallory opened on Jun 27, 2025
  1

• Extend the AST reflection

  asttypes
  Feature

  eclipse-langium/langium#1970 · Filter by author JohannesMeierSE opened on Jun 26, 2025
  2

• Incorrect alternatives proposed for parameterized rule

  parser
  Bug

  eclipse-langium/langium#1953 · Filter by author spoenemann opened on Jun 13, 2025

• AST to code transformation (serializer / stringifier)

  Feature

  eclipse-langium/langium#1915 · Filter by author AresEkb opened on Apr 26, 2025
  4

  

• Provide syntax to suppress specific warnings

  Feature

  eclipse-langium/langium#1909 · Filter by author sidharthv96 opened on Apr 15, 2025

• Migrate to eslint 9

  Feature

  eclipse-langium/langium#1905 · Filter by author kaisalmen opened on Apr 14, 2025

• Update TypeScript configuration and raise minimum engine requirement

  Feature

  eclipse-langium/langium#1904 · Filter by author kaisalmen opened on Apr 14, 2025
  4

• More flexible file matching in langium-config.json

  Feature

  eclipse-langium/langium#1871 · Filter by author ydaveluy opened on Mar 26, 2025
  2

• Inconsistent validation behavior on cross-reference alternatives

  Bug

  eclipse-langium/langium#1870 · Filter by author dgDSA opened on Mar 25, 2025
  3

• Support default value for Reference

  eclipse-langium/langium#1864 · Filter by author ydaveluy opened on Mar 21, 2025
  1

• Provide a mechanism to override a rule from an imported grammar

  grammarhelp wanted
  Feature

  eclipse-langium/langium#1859 · Filter by author ydaveluy opened on Mar 19, 2025
  6