@atlaskit/eslint-plugin-design-system/dist/es2019/rules/ensure-design-token-usage/is-calc.js

The essential plugin for use with the Atlassian Design System.

const calcRegex = /(^calc)/;
export const isCalc = value => {
  if (typeof value === 'string') {
    if (calcRegex.test(value)) {
      return true;
    }
  }
  return false;
};