Move Sass Export Data to Pattern Lab App

[jryanconklin]

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Issue

Sass exported data is a dependency of the pattern lab app and should not be held in tokens.

Analysis

tokens contains a mixin, /tokens/sass/non-printing/mixins/_export-data.scss that is only used in Pattern Lab. The mixin should be moved directly to the pattern lab app apps/node-pl for better code organization.

Confirmation

As a developer, my global data variables are written to JSON for pattern-lab to use and code is organized.