support null values

jonathanong · Sep 23, 2023 · 63b9777 · 63b9777
1 parent 15f3844
commit 63b9777
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Showing 3 changed files with 12 additions and 0 deletions.
diff --git a/__tests__/__snapshots__/types.js.snap b/__tests__/__snapshots__/types.js.snap
@@ -1,5 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`a null value 1`] = `"__1____2____3__"`;
+
 exports[`a promise-returning function 1`] = `"__1__asdf__2__"`;
 
 exports[`a stream 1`] = `"__1__asdf__2__"`;

diff --git a/__tests__/types.js b/__tests__/types.js
@@ -54,3 +54,12 @@ test('a stream', async () => {
   assert.strictEqual(result, '__1__asdf__2__')
   expect(result).toMatchSnapshot()
 })
+
+test('a null value', async () => {
+  const promise1 = new Promise(resolve => setImmediate(() => resolve('')))
+  const promise2 = new Promise(resolve => setImmediate(() => resolve(null)))
+
+  const result = await streamToString(render`__1__${promise1}__2__${promise2}__3__`)
+  assert.strictEqual(result, '__1____2____3__')
+  expect(result).toMatchSnapshot()
+})
diff --git a/lib/index.js b/lib/index.js
@@ -30,6 +30,7 @@ function render (template, ...values) {
     }
 
     Promise.resolve(value).then((result) => {
+      if (!result) return
       if (typeof result === 'string') return stream.write(result)
       if (result.readableObjectMode) throw new Error('Readable object streams are not supported.')
       if (result.readable) return pipe(result)