text: import * as whitespace from "./whitespace";
  import * as parens from "./parentheses";
  import * as t from "babel-types";
  
  function expandAliases(obj) {
    const newObj = {};
  
    function add(type, func) {
      const fn = newObj[type];
      newObj[type] = fn
        ? function(node, parent, stack) {
            const result = fn(node, parent, stack);
  
            return result == null ? func(node, parent, stack) : result;
          }
        : func;
    }
  
    for (const type of Object.keys(obj)) {
      const aliases = t.FLIPPED_ALIAS_KEYS[type];
      if (aliases) {
        for (const alias of aliases) {
          add(alias, obj[type]);
        }
      } else {
        add(type, obj[type]);
      }
    }
  
    return newObj;
  }
  
  // Rather than using `t.is` on each object property, we pre-expand any type aliases
  // into concrete types so that the 'find' call below can be as fast as possible.
  const expandedParens = expandAliases(parens);
  const expandedWhitespaceNodes = expandAliases(whitespace.nodes);
  const expandedWhitespaceList = expandAliases(whitespace.list);
  
  function find(obj, node, parent, printStack) {
    const fn = obj[node.type];
    return fn ? fn(node, parent, printStack) : null;
  }
  
  function isOrHasCallExpression(node) {
    if (t.isCallExpression(node)) {
      return true;
    }
  
    if (t.isMemberExpression(node)) {
      return (
        isOrHasCallExpression(node.object) ||
        (!node.computed && isOrHasCallExpression(node.property))
      );
    } else {
      return false;
    }
  }
  
  export function needsWhitespace(node, parent, type) {
    if (!node) return 0;
  
    if (t.isExpressionStatement(node)) {
      node = node.expression;
    }
  
    let linesInfo = find(expandedWhitespaceNodes, node, parent);
  
    if (!linesInfo) {
      const items = find(expandedWhitespaceList, node, parent);
      if (items) {
        for (let i = 0; i < items.length; i++) {
          linesInfo = needsWhitespace(items[i], node, type);
          if (linesInfo) break;
        }
      }
    }
  
    return (linesInfo && linesInfo[type]) || 0;
  }
  
  export function needsWhitespaceBefore(node, parent) {
    return needsWhitespace(node, parent, "before");
  }
  
  export function needsWhitespaceAfter(node, parent) {
    return needsWhitespace(node, parent, "after");
  }
  
  export function needsParens(node, parent, printStack) {
    if (!parent) return false;
  
    if (t.isNewExpression(parent) && parent.callee === node) {
      if (isOrHasCallExpression(node)) return true;
    }
  
    return find(expandedParens, node, parent, printStack);
  }
  