LogicalExpression.js

/**
 * Extractor function for a LogicalExpression type value node.
 * A logical expression is `a && b` or `a || b`, so we evaluate both sides
 * and return the extracted value of the expression.
 *
 * @param - value - AST Value object with type `LogicalExpression`
 * @returns - The extracted value converted to correct type.
 */
export default function extractValueFromLogicalExpression(value) {
  // eslint-disable-next-line global-require
  const getValue = require('.').default;
  const { operator, left, right } = value;
  const leftVal = getValue(left);
  const rightVal = getValue(right);

  if (operator === '&&') {
    return leftVal && rightVal;
  }
  if (operator === '??') {
    // return leftVal ?? rightVal; // TODO: update to babel 7
    return (leftVal === null || typeof leftVal === 'undefined') ? rightVal : leftVal;
  }
  return leftVal || rightVal;
}