solana-program-examples/basics/realloc/native/ts/instructions/create.ts

import * as borsh from "borsh";
import { Buffer } from "buffer";
import { 
    PublicKey, 
    SystemProgram,
    TransactionInstruction 
} from '@solana/web3.js';
import { ReallocInstruction } from './instruction';


export class Create {

    instruction: ReallocInstruction;
    name: string;
    house_number: number;
    street: string;
    city: string;

    constructor(props: {
        instruction: ReallocInstruction,
        name: string,
        house_number: number,
        street: string,
        city: string,
    }) {
        this.instruction = props.instruction;
        this.name = props.name;
        this.house_number = props.house_number;
        this.street = props.street;
        this.city = props.city;
    }

    toBuffer() { 
        return Buffer.from(borsh.serialize(CreateSchema, this)) 
    };
    
    static fromBuffer(buffer: Buffer) {
        return borsh.deserialize(CreateSchema, Create, buffer);
    };
};

export const CreateSchema = new Map([
    [ Create, { 
        kind: 'struct', 
        fields: [ 
            ['instruction', 'u8'],
            ['name', 'string'], 
            ['house_number', 'u8'], 
            ['street', 'string'], 
            ['city', 'string'], 
        ],
    }]
]);

export function createCreateInstruction(
    target: PublicKey,
    payer: PublicKey,
    programId: PublicKey,
    name: string,
    house_number: number,
    street: string,
    city: string,
): TransactionInstruction {

    const instructionObject = new Create({
        instruction: ReallocInstruction.Create,
        name,
        house_number,
        street,
        city,
    });

    const ix = new TransactionInstruction({
        keys: [
            {pubkey: target, isSigner: false, isWritable: true},
            {pubkey: payer, isSigner: true, isWritable: true},
            {pubkey: SystemProgram.programId, isSigner: false, isWritable: false}
        ],
        programId: programId,
        data: instructionObject.toBuffer(),
    });

    return ix;
}