buildUserOperation

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function buildUserOperation<
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  TTransport,
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  TChain,
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  TAccount,
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  TContext,
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  TEntryPointVersion,
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>(client_, args): Promise<UserOperationStruct<TEntryPointVersion>>;

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import { createSmartAccountClient } from "@aa-sdk/core";
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// smart account client is already extended with buildUserOperation
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const client = createSmartAccountClient(...);
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const result = await client.buildUserOperation({
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 uo: {
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   target: "0x...",
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   data: "0x...", // or "0x",
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   value: 0n, // optional
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 },
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 account, // only required if the client above is not connected to an account
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});