object pooling in component core, optimize style parser to reuse object

[ngokevin]

Description:

Rather than create a new object each time to create a new oldData, just have two objects representing oldData and data. Also when updating, rather than create a new data object, have a newData object that is used for holding the new data which then gets copied into data. So in total, only use three objects: oldData, data, newData.

Changes proposed:

• Adapt style-attr implementation to be able to pass in an object for reuse instead of creating a new one each time. Also remove lots of callbacks, Object.keys() array creations from their code. Also tweaked to do prettier stringifies. We manage this forked dependency now.
• Use object pooling in core component code to reduce object allocations. Recycle them when component is removed.
  • 1. Remove object allocation on each update for creating object for oldData.
  • 2. Remove object allocation on initialization for initial oldData.
  • 3. Remove object allocation on each update during buildData for default value copying.
• Add some helper properties to component (isSingleProp, isSinglePropObject, isObjectBased)
• Update our styleParser utils a bit to not allocate object + array + use callbacks to convert keys to camelCase.

[dmarcos]

Full name isSinglePropertySchema?

[ngokevin]

Spent a day to get this updated with passing tests. Optimizing the component core, string parsing, and adding in object pooling practices.

[ngokevin]

@dmarcos r?

[ngokevin]

Updated to not delete the keys when recycling an object, but just set every key to undefined. This means object pooling best used when objects share a common schema, in case we iterate over keys. So I create different object pools for each type of component, since their object keys will be the same. I also update schema parser to ignore undefined keys.

Before

After

Improvements: See the updateProperties and updateCachedAttrValue no longer on the list of frequent memory allocators. (I have other PRs open to remove deepEqual and updateControllerList from that list).

[ngokevin]

Updated. Still need to polish/comment a bit more (and try to remove the clones for default values). But up and working again.

[dmarcos]

Tests fail

[ngokevin]

Moved to #3772