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Compute mint rent exemption dynamically in JS client #134

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Merged
lorisleiva merged 1 commit into from
Mar 3, 2026
Merged

Compute mint rent exemption dynamically in JS client #134

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17 changes: 10 additions & 7 deletions clients/js/src/createMint.ts
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Original file line number Diff line number Diff line change
@@ -1,11 +1,14 @@
import { getCreateAccountInstruction } from '@solana-program/system';
import { Address, InstructionPlan, OptionOrNullable, sequentialInstructionPlan, TransactionSigner } from '@solana/kit';
import {
Address,
getMinimumBalanceForRentExemption,
InstructionPlan,
OptionOrNullable,
sequentialInstructionPlan,
TransactionSigner,
} from '@solana/kit';
import { getInitializeMint2Instruction, getMintSize, TOKEN_PROGRAM_ADDRESS } from './generated';

// RPC `getMinimumBalanceForRentExemption` for 82 bytes, which is token mint size
// Hardcoded to avoid requiring an RPC request each time
const MINIMUM_BALANCE_FOR_MINT = 1461600;

export type CreateMintInstructionPlanInput = {
/** Funding account (must be a system account). */
payer: TransactionSigner;
Expand All @@ -19,7 +22,7 @@ export type CreateMintInstructionPlanInput = {
freezeAuthority?: OptionOrNullable<Address>;
/**
* Optional override for the amount of Lamports to fund the mint account with.
* @default 1461600
* @default enough to make the account rent-exempt (currently 1,461,600 Lamports)
* */
mintAccountLamports?: number;
};
Expand All @@ -38,7 +41,7 @@ export function getCreateMintInstructionPlan(
{
payer: input.payer,
newAccount: input.newMint,
lamports: input.mintAccountLamports ?? MINIMUM_BALANCE_FOR_MINT,
lamports: input.mintAccountLamports ?? getMinimumBalanceForRentExemption(BigInt(getMintSize())),
space: getMintSize(),
programAddress: config?.tokenProgram ?? TOKEN_PROGRAM_ADDRESS,
},
Expand Down