refactor: strictly typed

test/unit/liquid/cache.ts

@@ -3,7 +3,7 @@ import Liquid from 'src/liquid'
 import { mock, restore } from 'test/stub/mockfs'
 
 describe('LiquidOptions#cache', function () {
-  let engine
+  let engine: Liquid
   beforeEach(function () {
     engine = new Liquid({
       root: '/root/',

test/unit/liquid/liquid.ts

@@ -33,14 +33,14 @@ describe('Liquid', function () {
     })
     after(restore)
     it('should render single template', function (done) {
-      render.call({ root: '.' }, 'foo', null, (err, result) => {
+      render.call({ root: '.' }, 'foo', null as any, (err: Error | null, result: string | undefined) => {
         if (err) return done(err)
         expect(result).to.equal('foo')
         done()
       })
     })
     it('should render single template with Array-typed root', function (done) {
-      render.call({ root: ['.'] }, 'foo', null, (err, result) => {
+      render.call({ root: ['.'] }, 'foo', null as any, (err: Error | null, result: string | undefined) => {
         if (err) return done(err)
         expect(result).to.equal('foo')
         done()

test/unit/liquid/strict.ts

@@ -2,7 +2,7 @@ import Liquid from 'src/liquid'
 import { expect } from 'chai'
 
 describe('LiquidOptions#strict_*', function () {
-  let engine
+  let engine: Liquid
   const ctx = {}
   beforeEach(function () {
     engine = new Liquid({