chore(TypeScript): refactor objects into classes

fix: `Nil`(null, undefined) now renders as empty string
change: `parser.parseValue()` renamed to `parser.parseOutput`
change: registered tags/filters become static and shared across different liquid instances

test/unit/template-browser.ts

@@ -0,0 +1,85 @@
+import { resolve } from '../../src/parser/template-browser'
+import * as chai from 'chai'
+
+const expect = chai.expect
+
+describe('template-browser', function () {
+  if (+process.version.match(/^v(\d+)/)[1] < 8) {
+    console.info('jsdom not supported, skipping template-browser...')
+    return
+  }
+  const JSDOM = require('jsdom').JSDOM
+  beforeEach(function () {
+    const dom = new JSDOM(``, {
+      url: 'https://example.com/foo/bar/',
+      contentType: 'text/html',
+      includeNodeLocations: true
+    });
+    (global as any).document = dom.window.document
+  })
+  afterEach(function () {
+    delete (global as any).document
+  })
+  describe('resolve', function () {
+    it('should support relative root', function () {
+      expect(resolve('foo', './views/', {
+        extname: '',
+        root: ['.']
+      })).to.equal('https://example.com/foo/bar/views/foo')
+    })
+    it('should treat root as directory', function () {
+      expect(resolve('foo', './views', {
+        extname: '',
+        root: ['.']
+      })).to.equal('https://example.com/foo/bar/views/foo')
+    })
+    it('should support absolute root', function () {
+      expect(resolve('foo', '/views', {
+        extname: '',
+        root: ['.']
+      })).to.equal('https://example.com/views/foo')
+    })
+    it('should support empty root', function () {
+      expect(resolve('page.html', '', {
+        extname: '',
+        root: ['.']
+      })).to.equal('https://example.com/foo/bar/page.html')
+    })
+    it('should support full url as root', function () {
+      expect(resolve('page.html', 'https://example.com/views/', {
+        extname: '',
+        root: ['.']
+      })).to.equal('https://example.com/views/page.html')
+    })
+    it('should use options.root when root argument absent', function () {
+      expect(resolve('page.html', null, {
+        extname: '',
+        root: ['https://example.com/views', 'https://google.com/views']
+      })).to.equal('https://example.com/views/page.html')
+    })
+    it('should add extname when absent', function () {
+      expect(resolve('page', 'https://example.com/views/', {
+        extname: '.html',
+        root: ['.']
+      })).to.equal('https://example.com/views/page.html')
+    })
+    it('should add extname for urls have searchParams', function () {
+      expect(resolve('page?foo=bar', 'https://example.com/views/', {
+        extname: '.html',
+        root: ['.']
+      })).to.equal('https://example.com/views/page.html?foo=bar')
+    })
+    it('should not add extname when full url is given', function () {
+      expect(resolve('https://google.com/page.php', 'https://example.com/views/', {
+        extname: '.html',
+        root: ['.']
+      })).to.equal('https://google.com/page.php')
+    })
+    it('should not add extname when already have one', function () {
+      expect(resolve('page.php', 'https://example.com/views/', {
+        extname: '.html',
+        root: ['.']
+      })).to.equal('https://example.com/views/page.php')
+    })
+  })
+})