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* Change the filter samples to use entity filters

Property filters should be used in most places instead of the legacy filter functionality.

* Get rid of the source import

This auto-import breaks the samples tests

* run linter

* Empty-Commit

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… once (#1185)

* trim operator

In the legacy version of filter we trim the operator. We should do this here too.

* In test cases, replace various filter calls

Always pass entity filters into the filter function in tests to reflect new behavior.

* accept string too

A string is needed as an input parameter because we might trim it to get an operator.

* Use .filter the old way

Revert changes on the .filter method

* Change docs to use new filter

The new property filter should be used and this should be reflected in the doc comments.

* Use new Property filter

In entity.ts, use the new property filter constructor.

* Revert changes to operator

The changes cause compiler errors. Do not trim the operator for now.

* Move test up and add change

Add change to issue warning just once. Use google-gax so that the warning is issued just once.

* Revert "Change docs to use new filter"

This reverts commit c290481.

* run linter

* Add a test to ensure just one warning

A test to make sure the warning is emitted just once might provide proper coverage.

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@types/is](https://togithub.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/is) ([source](https://togithub.com/DefinitelyTyped/DefinitelyTyped)) | [`0.0.24` -> `0.0.25`](https://renovatebot.com/diffs/npm/@types%2fis/0.0.24/0.0.25) | [![age](https://developer.mend.io/api/mc/badges/age/npm/@types%2fis/0.0.25?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@types%2fis/0.0.25?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@types%2fis/0.0.24/0.0.25?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@types%2fis/0.0.24/0.0.25?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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* Allow the user to set fallback to rest

This provides a workaround for the connection issue.

* Putting together a test that mocks out gapic

Need to mock out Gapic and compare constructors

* This harness works properly

The harness mocks out the constructor and calls reach the constructor as well as the get function. So now we can see what values get passed into the constructor and get function.

* Add client testing module

Add a working test that makes sure the rest parameter gets passed down to the gapic layer.

* Regroup the code so it is better arranged

Proper describe blocks make it easier for the code to be arranged so that with and without rest tests can be incorporated into the code.

* Remove the datastore mock

Remove the datastore mock. It is not necessary.

* Add comments for test helper functions. Add tests for the non rest case.

* Clean up source code change

Make a programmatic link to the data type so that the intent is clearer.

* Add parameterized test

Parameterized tests will allow us to delete half the tests. A new type is created for the test parameters.

* Document the class for mocking datastore client

Explain the purpose of the class. This will make it useful for testing.

* Remove only

* Remove fallback params type

This type is only used once so inline it.

* Remove changes to system tests

Changes to system tests are not necessary. Remove them.

* Add header

* Check for client existence

assert resolves to falsy in tests. See if this solves the issue.

* Change it back

Add console logs and assert checks back in.

* Add more debugger logs

* Add project load logs

* console error

* Add comment for mocking out project id

This should allow the unit tests to pass in the continuous integration environment.

* linting fix

* Correct title of describe block

The title of the describe block should match the file. Remove console logs too.

* Change rest parameter in test to fallback

This parameter more specifically describes the change.

* Create a simple system test for using rest

This system test should show how the rest parameter is being used.

* Should check to see if entity is undefined

This allows the test to pass with a simple assertion check.

* Specify fallback type instead of string | undefin

Fallback type is more specific . Use it instead.

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