Issues

• toLocaleUpperCase() returns string "uppered"

  bug
  microsoft/hermes-windows#244 · Filter by author tero-paananen opened on Jul 28, 2025
  2

• [Proxy.js] : Add test case for newly added handling of JavaScript value is a string that looks like an array index

  microsoft/hermes-windows#242 · Filter by author iamAbhi-916 opened on Jul 25, 2025

• Investigate and Fix Failing Hermes Tests

  bug
  Bug

  microsoft/hermes-windows#230 · Filter by author iamAbhi-916 opened on Jun 27, 2025
  1

  

• Prioritize Hermes Windows Intl Apis

  Sprint-June25
  Task

  microsoft/hermes-windows#222 · Filter by author satkh opened on Jun 3, 2025
  

• Hermes Intl::DateTimeFormat default constructor fails with default locale and options

  bug
  microsoft/hermes-windows#198 · Filter by author anramanath opened on Aug 20, 2024

• URLSearchParams missing functionality

  bug
  microsoft/hermes-windows#186 · Filter by author mbest opened on May 29, 2024
  1

• Hermes Engine takes at least 2x more time to resolve promises.all than Chakra

  microsoft/hermes-windows#183 · Filter by author i-xarlos opened on May 24, 2024
  1

• I hope Static Hermes supported Windows, Linux, and MacOS.

  enhancement
  microsoft/hermes-windows#171 · Filter by author Foxchandaisuki opened on Mar 10, 2024

• Hermes as the RNW Default Engine

  enhancement
  microsoft/hermes-windows#157 · Filter by author TatianaKapos opened on May 3, 2023

• Add order to DateTimeFormat::resolvedOptions

  bug
  microsoft/hermes-windows#141 · Filter by author TatianaKapos opened on Nov 28, 2022

• Support Intl bestFit matching

  enhancement
  microsoft/hermes-windows#137 · Filter by author TatianaKapos opened on Oct 13, 2022

• Add Intl toLocaleLowerCase and toLocaleUpperCase

  enhancement
  microsoft/hermes-windows#136 · Filter by author TatianaKapos opened on Oct 13, 2022
  1

• Add Intl::NumberFormat

  enhancement
  microsoft/hermes-windows#135 · Filter by author TatianaKapos opened on Oct 13, 2022

• Add Intl::Collator

  enhancement
  microsoft/hermes-windows#134 · Filter by author TatianaKapos opened on Oct 13, 2022

• Add DateTimeFormat::formatToParts

  enhancementStatus: In PR
  microsoft/hermes-windows#132 · Filter by author TatianaKapos opened on Sep 29, 2022

• Hermes Engine takes 2.5 to 19 times longer to process promises than Chakra

  bugNeeds: triage 🔍Status: Fixed
  microsoft/hermes-windows#92 · Filter by author AlexLablaiksSAP opened on Apr 6, 2022
  7

  

• Enable inspecting state of Hermes environment from a crash dump

  enhancement
  microsoft/hermes-windows#21 · Filter by author Khalef1 opened on Oct 9, 2020 · Backlog