refactor(experimental): reduce getProgramAccounts types using generics

[steveluscher]

refactor(experimental): reduce getProgramAccounts types using generics

Summary

This so close to works. You can see the types in action here:

const address = 'abc' as Base58EncodedAddress;

/** No encoding */
const noEncodingWithContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
withContext: true,
});
const noEncodingFalseContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    withContext: false,
});
const noEncodingNoContextConfig = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address);

/** Base58 */
const base58EncodingWithContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'base58',
    withContext: true,
});
const base58EncodingFalseContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'base58',
    withContext: false,
});
const base58EncodingNoContextConfig = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'base58',
});

/** Base64 */
const base64EncodingWithContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'base64',
    withContext: true,
});
const base64EncodingFalseContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'base64',
    withContext: false,
});
const base64EncodingNoContextConfig = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'base64',
});

/** Base64-zstd */
const base64ZStdEncodingWithContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'base64+zstd',
    withContext: true,
});
const base64ZStdEncodingFalseContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'base64+zstd',
    withContext: false,
});
const base64ZStdEncodingNoContextConfig = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'base64+zstd',
});

/** JSON parsed */
const jsonParsedEncodingWithContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'jsonParsed',
    withContext: true,
});
const jsonParsedEncodingFalseContext = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'jsonParsed',
    withContext: false,
});
const jsonParsedEncodingNoContextConfig = (null as unknown as GetProgramAccountsApi).getProgramAccounts(address, {
    encoding: 'jsonParsed',
});

There's one TypeScript bug, though, that makes rpc.getProgramAccounts() ultimately lose all of its type information. It's because of this: microsoft/TypeScript#55435 (comment)

[mcintyre94]

This is awesome! Do you have any idea how tricky the fix would be on the Typescript side?

[steveluscher]

I'm not sure. I feel like it's a straightforward bug with infer, but nothing ever is.

It infers just fine if you:

1. Supply <any> for the type parameter
2. Don't have the return type depend on the type parameter

I feel like it should absolutely infer the full range of possible types when the type parameter is not supplied.

[github-actions]

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