Version 21.205.00 of the FIT SDK is available for download at https://developer.garmin.com/fit/get-the-sdk/ 

In this release:
  • JavaScript SDK
    • Performance improvements when decoding files
    • Added TypeScript support
    • Decoder now adheres to the profile for array fields.
      • Array fields will always be returned as arrays, even when there is only one element
      • Non-array fields will always return a non-array value
      • New behavior can be overridden with the read() method legacyArrayMode option
  • Profile Updates
    • Garmin Product Ids
      • fr170
      • fr170_music
      • fr70_2026
      • d2_mach2_pro