prepareSign

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function prepareSign<TAccount>(
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  client,
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  params,
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): Promise<{
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  chainId: `0x${string}`;
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  signatureRequest:
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    | {
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        data:
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          | string
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          | {
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              raw: `0x${string}`;
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            };
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        type: "personal_sign";
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      }
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    | {
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        data: {
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          domain?: {
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            chainId?: number;
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            name?: string;
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            salt?: `0x${string}`;
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            verifyingContract?: `0x${string}`;
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            version?: string;
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          };
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          message: {
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            [key: string]: unknown;
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          };
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          primaryType: string;
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          types: {
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            [key: string]: object[];
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          };
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        };
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        type: "eth_signTypedData_v4";
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      };
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}>;

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// Prepare a message to be signed
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const result = await client.prepareSign({
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  from: "0x1234...",
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  type: "personal_sign",
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  data: "Hello, world!",
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});