fix(pydeck-carto): Use local isPureObject

[donmccurdy]

Loading the latest version of pydeck-carto in a Python notebook environment, a function imported from @loaders.gl/core is not available, and throws an error when calling requestWithParameters:

There's some nuance in how the Python packages load dependencies from CDNs, which could benefit from a closer look, but in the meantime ... the function is very short, and maybe importing it from @loaders.gl/core is unnecessary. To resolve the bug, I've copied isObject and isPureObject into the CARTO module, both are one-liners.

Publishing a patch release of @deck.gl/carto will be enough to fix the bug — pydeck-carto does not require an update.

Background

• fix(carto): Fix broken encoding in POST requests #8865

Change List

• Copies isObject and isPureObject from @loaders.gl/core
• Updates unit tests

[coveralls]

coverage: 89.822% (+0.002%) from 89.82%
when pulling 4d6433a on donmccurdy/fix-pydeck-carto-isPureObject
into 950d666 on master.

[ibgreen]

If it fixes the problem...

[donmccurdy]

Found the cause of the bug. In the pydeck environment we have only the imports coming from the jupyter-widget build, which pulls in dependencies here...

deck.gl/modules/jupyter-widget/src/index.js

Line 17 in 950d666

import * as loadersExports from '@deck.gl/core/scripting/loadersgl';

... and cherry-picks ...

deck.gl/modules/core/src/scripting/loadersgl.ts

Lines 1 to 5 in 950d666

	/**
	* Re-exported loaders.gl API in the pre-built bundle
	* Cherry-pick loaders core exports that are relevant to deck
	*/
	export {registerLoaders, load, parse, fetchFile} from '@loaders.gl/core';

... and does not include isPureObject. It think it's probably more trouble than it's worth for a one-line function to pass that through, so I'd prefer to keep this PR as-is. We should be careful about adding new imports from @loaders.gl/* in pydeck-related code, unless/until the dependency loading is simplified. It's currently difficult to test local deck.gl changes in pydeck.

Likely there will be more options for dependency management if we are moving pydeck toward Anywidget, which has good support for ESM.

[ibgreen]

Such functions should probably be in @loaders.gl/loader-utils rather than @loaders.gl/core: visgl/loaders.gl#3001