Property 'bank' does not exist on type 'AccountNamespace<Idl>'.

[cxp-13]

When I try to apply the anchor client to the Eliza framework project and test its fetch function,

let program = new anchor.Program(idl as anchor.Idl, anchorProvider);

    // bank
    const bankInfos = await program.account.bank.fetchMultiple([
      rayTokenBank,
      wifTokenBank,
    ]);

It works during the test process but has problems when building.

packages/plugin-solana/src/tests/anchor.test.ts:32:45 - error TS2339: Property 'bank' does not exist on type 'AccountNamespace<Idl>'.

32     const bankInfos = await program.account.bank.fetchMultiple([
                                               ~~~~

[acheroncrypto]

It's because of the casting of the idl variable to anchor.Idl. The correct way is to cast it to the IDL type generated by Anchor in target/types, which will give you a full type support for your program.

Also FYI, this will be simplified in v0.31 (see Simpler Program construction).