How do detect if a Transaction failure occurs?

What is the return value of a transaction when it fails mid way, or does it throw an error?

Example:

const authorOrNull = await db.transaction(async (tx) => {
  const [u] = tx.insert(user).values(val).onConflictDoNothing().returning()

  if u:
    const [a] = tx.insert(author).values({ uId: u.id }).returning()
    return a ?? null
})

const authorOrNull = await db.transaction(async (tx) => {
  const [u] = tx.insert(user).values(val).onConflictDoNothing().returning()

  if u:
    const [a] = tx.insert(author).values({ uId: u.id }).returning()
    return a ?? null
})

const authorOrNull = await db.transaction(async (tx) => {
  const [u] = tx.insert(user).values(val).onConflictDoNothing().returning()

  if u:
    const [a] = tx.insert(author).values({ uId: u.id }).returning()
    return a ?? null
})

const authorOrNull = await db.transaction(async (tx) => {
  const [u] = tx.insert(user).values(val).onConflictDoNothing().returning()

  if u:
    const [a] = tx.insert(author).values({ uId: u.id }).returning()
    return a ?? null
})

How will I know when a transaction failure or a rollback has occurred, for example in case of random I/O failure, or resource exhaustion, or when the database connection is down half-way through the transaction

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How do detect if a Transaction failure occurs?

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