Fix accumulating spread in transform function

[wojtekmaj]

Spread syntax should be avoided on accumulators (like those in .reduce) because it causes a time complexity of O(n^2).

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Latest commit: c07bc9f

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Pull request overview

This PR updates the core transform implementation (default export) that converts an array of CSS-style tuples into a React Native style object, with the stated goal of improving accumulator performance.

Changes:

• Replaced the Array.reduce-based accumulator with an explicit for...of loop and a preallocated result object.
• Preserved the existing per-rule merge behavior via Object.assign into the accumulator object.

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[jacobp100]

@wojtekmaj If you know anybody in SC that's got permissions to add you as a contributor to this repo, I'd be happy for you to be added. Unfortunately I only have permission to approve & merge PRs