create if doesn't exist typeorm code example

Example: typeorm upsert

await connection.createQueryBuilder()
        .insert()
        .into(Post)
        .values(post2)
        .onConflict(`("id") DO NOTHING`)
        .execute();

await connection.createQueryBuilder()
        .insert()
        .into(Post)
        .values(post2)
        .onConflict(`("id") DO UPDATE SET "title" = :title`)
        .setParameter("title", post2.title)
        .execute();