Minimum Tern config for reproduction

.tern_config

{
  "plugins": {
    "node": {},
    "modules": {},
    "es_modules": {},
    "complete_strings": {}
  },
  "libs": [
    "browser",
    "ecmascript"
  ],
  "ecmaVersion": 6
}

style-constants.js

export const colors = {
  GREEN: '#7fad33',
  DARK_GREEN: '#04bb79',
  LIGHT_GREEN: '#b0cc7f',
  YELLOW: '#f4dca8',
  BLUE: '#0099cc',
  PINK: '#de6996',
  MEDIUM_BLUE: '#a6dbe2',
  LIGHT_BLUE: '#e3f2fd',
  ORANGE: '#b15f0e',
  LIGHT_ORANGE: '#ff8a65',
  GRAY: '#999999',
  BLACK: '#282828',
  LIGHT_GRAY: '#eceef2',
  MEDIUM_GRAY: '#99a4bb',
  MED_DARK_GRAY: '#777c80',
  DARK_GRAY: '#444444',
  WHITE: '#ffffff',
  RED: '#ff3333',
  VIOLET: '#d5c7e0',
};

export const fonts = {
  MAIN: 'SourceSansPro-Regular',
  PAIR: 'OpenSans-Regular',
  WELCOME: 'SourceSansPro-Regular',
};