refactor(abstract-utxo): inline toWasmBIP32 in signPsbtWasm#8861
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The signer keychain is already typed as bip32.BIP32Interface | BIP32 (both from wasm-utxo). Convert directly via BIP32.fromBase58 instead of routing through the wasmUtil bridge. Refs: T1-3279
davidkaplanbitgo
approved these changes
May 26, 2026
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Summary
Removes `signPsbtWasm.ts`'s dependency on the `toWasmBIP32` bridge in `wasmUtil.ts` by inlining a local helper that accepts either a wasm `BIP32` or a `bip32.BIP32Interface` (also from wasm-utxo) and returns a wasm `BIP32`. No utxolib types involved.
PR group context
Part of an 8-PR fan-out removing `@bitgo/utxo-lib` from abstract-utxo runtime. Independent — file-disjoint from the other PRs in this group. Can merge in any order.
Test plan
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