feat: exported Drop interface for #107

Deprecate snake_cased options and APIs, sed #109

test/integration/drop/drop.ts

@@ -0,0 +1,35 @@
+import { expect } from 'chai'
+import Liquid from '../../../src/liquid'
+
+describe('drop/drop', function () {
+  let liquid: Liquid
+  before(() => (liquid = new Liquid()))
+
+  class CustomDrop extends Liquid.Types.Drop {
+    name: string = 'NAME'
+    getName() {
+      return 'GETNAME'
+    }
+  }
+  class CustomDropWithMethodMissing extends CustomDrop {
+    liquidMethodMissing(key: string) {
+      return key.toUpperCase()
+    }
+  }
+  it('should call corresponding method', async function () {
+    const html = await liquid.parseAndRender(`{{obj.getName}}`, {obj: new CustomDrop()})
+    expect(html).to.equal('GETNAME')
+  })
+  it('should read corresponding property', async function () {
+    const html = await liquid.parseAndRender(`{{obj.name}}`, {obj: new CustomDrop()})
+    expect(html).to.equal('NAME')
+  })
+  it('should output empty string if not exist', async function () {
+    const html = await liquid.parseAndRender(`{{obj.foo}}`, {obj: new CustomDrop()})
+    expect(html).to.equal('')
+  })
+  it('should respect liquidMethodMissing', async function () {
+    const html = await liquid.parseAndRender(`{{obj.foo}}`, {obj: new CustomDropWithMethodMissing()})
+    expect(html).to.equal('FOO')
+  })
+})