Function balanceCheck

balanceCheck(
    args: {
        op: IntOpString | IntegerOperator;
        target: PublicKey;
        threshold: number | bigint;
    },
): {
    init: {
        numPinnedAccounts: number;
        pinnedAccounts: { index: number; pubkey: PublicKey }[];
        validationData: Buffer;
    };
    spec: DecodeEnum;
}
Assert that an SPL token account's amount field satisfies threshold op.

Wraps lighthouse.tokenAccount(target).amount(threshold, op).build() → lighthouseValidation. Pure function — no I/O.
Parameters
- args: {
      op: IntOpString | IntegerOperator;
      target: PublicKey;
      threshold: number | bigint;
  }
Returns {
    init: {
        numPinnedAccounts: number;
        pinnedAccounts: { index: number; pubkey: PublicKey }[];
        validationData: Buffer;
    };
    spec: DecodeEnum;
}
Example: Threshold top-up guard (fires when balance drops below 50 USDC)
```
balanceCheck({ target: hotWalletAta, threshold: 50_000_000, op: "<" })
```
- Defined in packages/sdk/src/validation-recipes.ts:90