feat: nil/null/empty/blank literals, resolves #102

test/e2e/drop.ts

@@ -0,0 +1,21 @@
+import Liquid from '../..'
+import { expect, use } from 'chai'
+import * as chaiAsPromised from 'chai-as-promised'
+
+use(chaiAsPromised)
+
+describe('drop', function () {
+  var engine: Liquid
+  beforeEach(function () {
+    engine = new Liquid()
+  })
+  it('should test blank strings', async function () {
+    const src = `
+    {% unless settings.fp_heading == blank %}
+        <h1>{{ settings.fp_heading }}</h1>
+    {% endunless %}`
+    var ctx = { settings: { fp_heading: '' } }
+    const html = await engine.parseAndRender(src, ctx)
+    return expect(html).to.match(/^\s+$/)
+  })
+})

test/e2e/parse-and-render.ts

@@ -62,4 +62,9 @@ describe('.parseAndRender()', function () {
     const html = await engine.parseAndRender(src)
     return expect(html).to.equal('apples')
   })
+  it('should support nil(null, undefined) literal', async function () {
+    const src = '{% if notexist == nil %}true{% endif %}'
+    const html = await engine.parseAndRender(src)
+    expect(html).to.equal('true')
+  })
 })