How do I use the ABI decoder without deferring errors?

[sealer3]

There is no error thrown when requesting ethers to decode this ABI type:

a = ethers.AbiCoder.defaultAbiCoder().decode(["address"], "0xb47b2fb10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000964ec5e2e3419c4cc", true)
> Proxy [
  Result(1) [
    value exceeds width (20 bytes) (operation="toBeHex", fault="overflow", value=81633964087944550421898347516412261609448132923240477519941993112300444188672, code=NUMERIC_FAULT, version=6.15.0)
    ],
  { get: [Function: get] }
]

The variable a now contains a Proxy array whose first element is this error. Accessing it causes the error to be thrown:

a[0]
> Uncaught Error: deferred error during ABI decoding triggered accessing index 0

How can I use the ABI decoder without deferring these errors? I would like the error to be thrown during the original call to decode and not later.

[ricmoo]

You can call the .toArray(true) method on the Proxy object. It will recursively convert the Result object into an Array of its values, and if it encounters any error will throw that first error during conversion.

The main reason for the deferred API is that there is a lot of bad data (from old broken encoders and from some protocols trying to hijack weird parts of the ABI coding), so it is important for most people to still be able to access things "around" the bad chunks.

Let me know though if you have any more issues. :)

[sealer3]

Thank you very much! That's perfect. (And even more so for the ultra-fast response - it saved me from writing a function to walk the proxy arrays!)