Issues

• argsForProcessChanges accepts changesetRanges and csFileProps but the transformer ignores them

  iTwin/imodel-transformer#472 · Filter by author hl662 opened on Oct 14, 2026

• ElementAspects on a shared element are deleted or overwritten by another source's transform

  bugenhancement
  iTwin/imodel-transformer#462 · Filter by author hl662 opened on Oct 6, 2026
  2

• Expose API that could be used to check if there are source changes to be exported

  iTwin/imodel-transformer#460 · Filter by author JulijaRamoskiene opened on Oct 5, 2026
  1

• Performance: Transformer should return early when there are no changes to process and custom changes will not be added

  iTwin/imodel-transformer#459 · Filter by author JulijaRamoskiene opened on Oct 5, 2026

• Unchanged processAll rerun still updates every target element

  iTwin/imodel-transformer#448 · Filter by author hl662 opened on Sep 29, 2026

• Transformer deletes and re-adds unchanged ElementAspects on every run

  iTwin/imodel-transformer#445 · Filter by author hl662 opened on Sep 29, 2026
  1

  

• ChangesetScanner uses unbounded memory

  iTwin/imodel-transformer#434 · Filter by author ColinKerr opened on Sep 24, 2026
  3

  

• Performance: Improve iteration logic in transformer

  iTwin/imodel-transformer#432 · Filter by author JulijaRamoskiene opened on Sep 23, 2026
  1

• Performance: Use the last processed source iModel version during transformation to resolve element provenance during change processing

  iTwin/imodel-transformer#431 · Filter by author JulijaRamoskiene opened on Sep 23, 2026
  

• perf: Batch aspect mutations by owner element

  performance
  iTwin/imodel-transformer#428 · Filter by author DanRod1999 opened on Sep 21, 2026
  1

• Transformer is not handling reused entity ids

  iTwin/imodel-transformer#425 · Filter by author JulijaRamoskiene opened on Sep 17, 2026
  2

  

• perf: Profile Transformer Perf to Find Bottle Necks

  performance
  Epic

  iTwin/imodel-transformer#424 · Filter by author DanRod1999 opened on Sep 16, 2026
  3

  

• Prepare and bulk-reserve element IDs before target insertion

  iTwin/imodel-transformer#418 · Filter by author hl662 opened on Sep 8, 2026
  3

  

• perf: support fixture blending for all quick-performance scenarios

  enhancementlow priorityperformance
  iTwin/imodel-transformer#406 · Filter by author hl662 opened on Aug 13, 2026

• ExternalSourceAspect provenance lookups run one query per entity during export and delete processing

  performance
  iTwin/imodel-transformer#403 · Filter by author DanRod1999 opened on Aug 11, 2026
  

• Remove isUpdate from export handler callbacks

  apirefactor
  iTwin/imodel-transformer#351 · Filter by author DanRod1999 opened on Jul 27, 2026

• Simplify the transformer element processing pipeline

  refactor
  iTwin/imodel-transformer#350 · Filter by author DanRod1999 opened on Jul 27, 2026

• Remove preExportElement from the export callback pipeline

  refactor
  iTwin/imodel-transformer#349 · Filter by author DanRod1999 opened on Jul 27, 2026

• Separate transformer orchestration from export callback handling

  apirefactor
  iTwin/imodel-transformer#348 · Filter by author DanRod1999 opened on Jul 27, 2026
  3

  

• Importer write and update semantics cleanup

  bugtech-debt
  iTwin/imodel-transformer#323 · Filter by author hl662 opened on Jul 10, 2026

• Rework recreated element and model handling

  refactor
  iTwin/imodel-transformer#327 · Filter by author hl662 opened on Jul 10, 2026

• Decouple IModelExporter and IModelTransformer

  apirefactor
  iTwin/imodel-transformer#325 · Filter by author hl662 opened on Jul 10, 2026
  

• Simplify reference and remap tracking

  refactortech-debt
  iTwin/imodel-transformer#324 · Filter by author hl662 opened on Jul 10, 2026

• Figure out what the runtime backend-version check is for

  question
  iTwin/imodel-transformer#326 · Filter by author hl662 opened on Jul 10, 2026

• Style, file size, and comment cleanup

  good first issuetech-debt
  iTwin/imodel-transformer#320 · Filter by author hl662 opened on Jul 10, 2026