text: export {default as isReference} from 'is-reference';
  
  export function flatten(node) {
  	const parts = [];
  
  	while (node.type === 'MemberExpression') {
  		if (node.computed) return null;
  
  		parts.unshift(node.property.name);
  		node = node.object;
  	}
  
  	if (node.type !== 'Identifier') return null;
  
  	const name = node.name;
  	parts.unshift(name);
  
  	return { name, keypath: parts.join('.') };
  }
  
  export function isTruthy(node) {
  	if (node.type === 'Literal') return !!node.value;
  	if (node.type === 'ParenthesizedExpression') return isTruthy(node.expression);
  	if (node.operator in operators) return operators[node.operator](node);
  }
  
  export function isFalsy(node) {
  	return not(isTruthy(node));
  }
  
  function not(value) {
  	return value === undefined ? value : !value;
  }
  
  function equals(a, b, strict) {
  	if (a.type !== b.type) return undefined;
  	if (a.type === 'Literal') return strict ? a.value === b.value : a.value == b.value;
  }
  
  const operators = {
  	'==': x => {
  		return equals(x.left, x.right, false);
  	},
  
  	'!=': x => not(operators['=='](x)),
  
  	'===': x => {
  		return equals(x.left, x.right, true);
  	},
  
  	'!==': x => not(operators['==='](x)),
  
  	'!': x => isFalsy(x.argument),
  
  	'&&': x => isTruthy(x.left) && isTruthy(x.right),
  
  	'||': x => isTruthy(x.left) || isTruthy(x.right)
  };
  