Derivable EVM Coin Names

[adraffy]

evmCoinTypeToNameMap is frozen and in ensjs: bypassFormat cannot be supplied to getRecords().

This might require additional changes elsewhere, but EVM coinTypes shouldn't require a name.

[TateB]

this concept seems useful but it'll need a few minor API additions probably + some type updates. i'm not sure that the expected default behaviour should be to return the name of a coin as effectively "Unknown", so maybe it works better to either:
a. have an "allowUnknownEvm" param or similar, or
b. allow a custom name mapping for evms to be passed into the coin type getter

is there a specific use-case you have in mind for this?

[TateB]

alternatively, maybe its better to just have ensjs changes here?

[adraffy]

All EVM coins are synthetic though according to ENSIP-11, why do they need to be added into that frozen map to be supported by this library?

[TateB]

they don't, i was just considering the best api for this

what about formatted as:
Unknown Chain (${chainId}) and an unknownEvmChain property

does that work for your use-case?

[adraffy]

Ah sorry, I think I misread your initial response.

Any name format would work for me, and being able to know that the name is "unnamed" is great too!

---

Related: say I have a coinType is there an isEVMCoinType(type): boolean?

With the above change, you can now do:

function isEVMCoinType(x) {
    try {
        return getCoderByCoinType(x).evmChainId > 0;
     } catch (ignored) {}
}

Or currently, you need to import from utils/evm:

function isEVMCoinType(x) {
    try {
        return coinTypeToEvmChainId(x);
     } catch (ignored) {}
}

Alternatively, instead of the large API surface, you could use a single function:

// chain > type > name
let coder = getCoin({chain: 5});
let coder = getCoin({type: 60});
let coder = getCoin({name: 'ETH'});

getCoin({type: 0x80000000+5}).isEVM // true
getCoin({chain: 5}).isEVM // true
getCoin({chain: 69}).isUnnamed // true
getCoin({name: 'ETH'}).type // 60
getCoin({chain: 100}).legacyType // 700

[TateB]

i think isEvmCoinType(coinType) is reasonable