chore(TypeScript): ship Liquid to class

BREAKING CHANGE: calling `Liquid()` without `new` now becomes invalid

test/e2e/express.js

@@ -13,7 +13,7 @@ describe('engine#express()', function () {
 
   beforeEach(function () {
     app = express()
-    engine = Liquid({
+    engine = new Liquid({
       root: '/root',
       extname: '.html'
     })

test/e2e/parse-and-render.js

@@ -7,8 +7,8 @@ chai.use(require('chai-as-promised'))
 describe('.parseAndRender()', function () {
   var engine, strictEngine
   beforeEach(function () {
-    engine = Liquid()
-    strictEngine = Liquid({
+    engine = new Liquid()
+    strictEngine = new Liquid({
       strict_filters: true
     })
   })

test/e2e/render-file.js

@@ -8,7 +8,7 @@ chai.use(require('chai-as-promised'))
 describe('#renderFile()', function () {
   var engine
   beforeEach(function () {
-    engine = Liquid({
+    engine = new Liquid({
       root: '/root/',
       extname: '.html'
     })
@@ -29,7 +29,7 @@ describe('#renderFile()', function () {
       .to.eventually.equal('foo')
   })
   it('should find files without extname', function () {
-    var engine = Liquid({ root: '/root' })
+    var engine = new Liquid({ root: '/root' })
     return expect(engine.renderFile('/root/files/bar', {}))
       .to.eventually.equal('bar')
   })
@@ -38,7 +38,7 @@ describe('#renderFile()', function () {
       .to.eventually.equal('foo')
   })
   it('should resolve array as root', function () {
-    engine = Liquid({
+    engine = new Liquid({
       root: ['/boo', '/root/'],
       extname: '.html'
     })
@@ -50,7 +50,7 @@ describe('#renderFile()', function () {
     files[process.cwd() + '/foo.html'] = 'FOO'
     mock(files)
 
-    engine = Liquid({
+    engine = new Liquid({
       extname: '.html'
     })
     return expect(engine.renderFile('foo.html'))
@@ -64,7 +64,7 @@ describe('#renderFile()', function () {
     return expect(engine.renderFile('files/name', { name: 'harttle' })).to.eventually.equal('My name is harttle.')
   })
   it('should throw with lookup list when file not exist', function () {
-    engine = Liquid({
+    engine = new Liquid({
       root: ['/boo', '/root/'],
       extname: '.html'
     })

test/e2e/xhr.js

@@ -23,7 +23,7 @@ describe('xhr', () => {
     })
     global.XMLHttpRequest = sinon.useFakeXMLHttpRequest()
     global.document = dom.window.document
-    engine = Liquid({
+    engine = new Liquid({
       root: 'https://example.com/views/',
       extname: '.html'
     })
@@ -78,7 +78,7 @@ describe('xhr', () => {
   })
   describe('#renderFile() with root specified', () => {
     it('should support undefined root', () => {
-      engine = Liquid({
+      engine = new Liquid({
         extname: '.html'
       })
       server.respondWith('GET', 'https://example.com/foo/hello.html',
@@ -87,7 +87,7 @@ describe('xhr', () => {
         .to.eventually.equal('hello alice5')
     })
     it('should support empty root', () => {
-      engine = Liquid({
+      engine = new Liquid({
         root: '',
         extname: '.html'
       })
@@ -97,7 +97,7 @@ describe('xhr', () => {
         .to.eventually.equal('hello alice5')
     })
     it('should support with relative path', () => {
-      engine = Liquid({
+      engine = new Liquid({
         root: './views/',
         extname: '.html'
       })
@@ -107,7 +107,7 @@ describe('xhr', () => {
         .to.eventually.equal('hello alice5')
     })
     it('should support with absolute path', () => {
-      engine = Liquid({
+      engine = new Liquid({
         root: '/views/',
         extname: '.html'
       })
@@ -117,7 +117,7 @@ describe('xhr', () => {
         .to.eventually.equal('hello alice5')
     })
     it('should support with url', () => {
-      engine = Liquid({
+      engine = new Liquid({
         root: 'https://foo.com/bar/',
         extname: '.html'
       })
@@ -141,7 +141,7 @@ describe('xhr', () => {
         .then(html => expect(html).to.equal('foo2'))
     })
     it('should respect cache=true option', () => {
-      engine = Liquid({
+      engine = new Liquid({
         root: '/views/',
         extname: '.html',
         cache: true