@ledgerhq/coin-stellar/src/polyfill.ts

Ledger Stellar Coin integration

// SPDX-FileCopyrightText: © 2026 LEDGER SAS
// SPDX-License-Identifier: Apache-2.0

import { log } from '@ledgerhq/logs'

/*
 * This whole patch thing is messy:
 * It's goal is to: Fix error when sending a token transaction in Stellar
 * It originally was in ledger-mobile polyfill.ts (https://github.com/LedgerHQ/ledger-live/pull/9687)
 * But globally patching is not a good idea, and broke the polkadot sdk
 */

// Save original methods once at app startup
const OriginalTypedArrayMethods = {
  subarray: Uint8Array.prototype.subarray,
  slice: Uint8Array.prototype.slice,
  map: Uint8Array.prototype.map,
  filter: Uint8Array.prototype.filter,
}

// Track whether we actually patched
let hermesTypedArrayPatched = false

export function patchHermesTypedArraysIfNeeded() {
  if (global.HermesInternal && !hermesTypedArrayPatched) {
    try {
      log('coin:stellar', '🔵 Patching TypedArray because of Hermes bug')
      // Only require the module when we're actually running on Hermes
      // eslint-disable-next-line @typescript-eslint/no-var-requires
      const fixHermesTypedArrayBug = require('@exodus/patch-broken-hermes-typed-arrays')
      fixHermesTypedArrayBug()
      hermesTypedArrayPatched = true
    } catch {
      log('coin:stellar', 'Failed to patch typed arrays')
    }
  }
}

export function unpatchHermesTypedArrays() {
  if (hermesTypedArrayPatched) {
    const TypedArray = Object.getPrototypeOf(Uint8Array)

    TypedArray.prototype.subarray = OriginalTypedArrayMethods.subarray
    TypedArray.prototype.slice = OriginalTypedArrayMethods.slice
    TypedArray.prototype.map = OriginalTypedArrayMethods.map
    TypedArray.prototype.filter = OriginalTypedArrayMethods.filter

    log('coin:stellar', '🟢 Reverted TypedArray methods to originals')
    hermesTypedArrayPatched = false // reset
  }
}