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metamask-extension/app/scripts/controllers/network/createMetamaskMiddleware.js

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import { createScaffoldMiddleware, mergeMiddleware } from 'json-rpc-engine';
import { createWalletMiddleware } from 'eth-json-rpc-middleware';
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import {
createPendingNonceMiddleware,
createPendingTxMiddleware,
} from './middleware/pending';
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export default function createMetamaskMiddleware({
version,
getAccounts,
processTransaction,
processEthSignMessage,
processTypedMessage,
processTypedMessageV3,
processTypedMessageV4,
processPersonalMessage,
processDecryptMessage,
processEncryptionPublicKey,
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getPendingNonce,
getPendingTransactionByHash,
}) {
const metamaskMiddleware = mergeMiddleware([
createScaffoldMiddleware({
eth_syncing: false,
web3_clientVersion: `MetaMask/v${version}`,
}),
createWalletMiddleware({
getAccounts,
processTransaction,
processEthSignMessage,
processTypedMessage,
processTypedMessageV3,
processTypedMessageV4,
processPersonalMessage,
processDecryptMessage,
processEncryptionPublicKey,
}),
createPendingNonceMiddleware({ getPendingNonce }),
createPendingTxMiddleware({ getPendingTransactionByHash }),
]);
return metamaskMiddleware;
}