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For a full list of changes, please refer to the CHANGELOG.

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Record not found, no longer errors

The Polybase client @polybase/client no longer throws an error if a record is not found. Polybase now always returns a CollectionRecordResponse. If the record does not exist, the .data property will be null. You can call also use the helper method .exists() to check if the record exists.

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Before

You had to capture the error and check if it was a PolybaseError and if the reason was record/not-found. 
const userData = await polybase.collection<User>('User').record(publicKey).get()
.catch(async (err) => {
  // Previously, you would get an error if the record did not exist
  if (err && err instanceof PolybaseError && err.reason === 'record/not-found') {
    // Record does not exist
    return null
  }
  throw err
})

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After

Polybase client will not error on record not found. Instead, .data property will be null. 
// userData will always return a CollectionRecordResponse (even if record does not exist)
const userData = await polybase.collection<User>('User').record(publicKey).get()

// Check if the record exists
const exists = userData.exists()

// Or check if the data is null
const exists = userData.data === null