test: cases for async variables

package-lock.json

@@ -2662,9 +2662,9 @@
       }
     },
     "caniuse-lite": {
-      "version": "1.0.30001312",
+      "version": "1.0.30001335",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001312.tgz",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001335.tgz",
-      "integrity": "sha512-Wiz1Psk2MEK0pX3rUzWaunLTZzqS2JYZFzNKqAiJGiuxIjRPLgV6+VDPOg6lQOUxmDwhTlh198JsTTi8Hzw6aQ==",
+      "integrity": "sha512-ddP1Tgm7z2iIxu6QTtbZUv6HJxSaV/PZeSrWFZtbY4JZ69tOeNhBCl3HyRQgeNZKE5AOn1kpV7fhljigy0Ty3w==",
       "dev": true
     },
     "cardinal": {

src/render/expression.ts

@@ -25,9 +25,9 @@ export class Expression {
     const operands: any[] = []
     for (const token of this.postfix) {
       if (TypeGuards.isOperatorToken(token)) {
-        const r = yield operands.pop()
+        const r = operands.pop()
-        const l = yield operands.pop()
+        const l = operands.pop()
-        const result = evalOperatorToken(ctx.opts.operators, token, l, r, ctx)
+        const result = yield evalOperatorToken(ctx.opts.operators, token, l, r, ctx)
         operands.push(result)
       } else {
         operands.push(yield evalToken(token, ctx, lenient && this.postfix.length === 1))

test/integration/builtin/tags/if.ts

@@ -142,4 +142,10 @@ describe('tags/if', function () {
     const html = liquid.parseAndRenderSync(src, scope)
     return expect(html).to.equal('true')
   })
+  it('should support async variables', async () => {
+    const src = `{%if var == 'var' %}success{%endif%}`
+    const scope = { 'var': Promise.resolve('var') }
+    const html = await liquid.parseAndRender(src, scope)
+    return expect(html).to.equal('success')
+  })
 })

test/integration/liquid/liquid.ts

@@ -52,6 +52,11 @@ describe('Liquid', function () {
       const src = '{{ foo }}'
       return expect(engine.parseAndRender(src, {}, { strictVariables: true })).rejectedWith(/undefined variable/)
     })
+    it('should support async variables in output', async () => {
+      const src = '{{ foo }}'
+      const html = await engine.parseAndRender(src, { foo: Promise.resolve('FOO') })
+      expect(html).to.equal('FOO')
+    })
   })
   describe('#express()', function () {
     const liquid = new Liquid({ root: '/root' })