Fix usage of default exports with TypeScript

This is done by assigning the property `default` for all properties that are
exported using `export default` according to their type definitions.

Closes #1424

lib/at-rule.js

@@ -20,5 +20,6 @@ class AtRule extends Container {
 }
 
 module.exports = AtRule
+AtRule.default = AtRule
 
 Container.registerAtRule(AtRule)

lib/comment.js

@@ -10,3 +10,4 @@ class Comment extends Node {
 }
 
 module.exports = Comment
+Comment.default = Comment

lib/container.js

@@ -426,3 +426,4 @@ Container.registerAtRule = dependant => {
 }
 
 module.exports = Container
+Container.default = Container

lib/css-syntax-error.js

@@ -89,3 +89,4 @@ class CssSyntaxError extends Error {
 }
 
 module.exports = CssSyntaxError
+CssSyntaxError.default = CssSyntaxError

lib/declaration.js

@@ -21,3 +21,4 @@ class Declaration extends Node {
 }
 
 module.exports = Declaration
+Declaration.default = Declaration

lib/input.js

@@ -139,6 +139,7 @@ class Input {
 }
 
 module.exports = Input
+Input.default = Input
 
 if (terminalHighlight && terminalHighlight.registerInput) {
   terminalHighlight.registerInput(Input)

lib/lazy-result.js

@@ -475,5 +475,6 @@ LazyResult.registerPostcss = dependant => {
 }
 
 module.exports = LazyResult
+LazyResult.default = LazyResult
 
 Root.registerLazyResult(LazyResult)

lib/list.js

@@ -53,3 +53,4 @@ let list = {
 }
 
 module.exports = list
+list.default = list

lib/node.js

@@ -288,3 +288,4 @@ class Node {
 }
 
 module.exports = Node
+Node.default = Node

lib/parse.js

@@ -37,5 +37,6 @@ function parse (css, opts) {
 }
 
 module.exports = parse
+parse.default = parse
 
 Container.registerParse(parse)

lib/postcss.js

@@ -85,3 +85,4 @@ postcss.Node = Node
 LazyResult.registerPostcss(postcss)
 
 module.exports = postcss
+postcss.default = postcss

lib/previous-map.js

@@ -140,3 +140,4 @@ class PreviousMap {
 }
 
 module.exports = PreviousMap
+PreviousMap.default = PreviousMap

lib/processor.js

@@ -65,5 +65,6 @@ class Processor {
 }
 
 module.exports = Processor
+Processor.default = Processor
 
 Root.registerProcessor(Processor)

lib/result.js

@@ -39,3 +39,4 @@ class Result {
 }
 
 module.exports = Result
+Result.default = Result

lib/root.js

@@ -56,3 +56,4 @@ Root.registerProcessor = dependant => {
 }
 
 module.exports = Root
+Root.default = Root

lib/rule.js

@@ -22,5 +22,6 @@ class Rule extends Container {
 }
 
 module.exports = Rule
+Rule.default = Rule
 
 Container.registerRule(Rule)

lib/stringify.js

@@ -2,7 +2,10 @@
 
 let Stringifier = require('./stringifier')
 
-module.exports = function stringify (node, builder) {
+function stringify (node, builder) {
   let str = new Stringifier(builder)
   str.stringify(node)
 }
+
+module.exports = stringify
+stringify.default = stringify

lib/warning.js

@@ -32,3 +32,4 @@ class Warning {
 }
 
 module.exports = Warning
+Warning.default = Warning