emotion-js · Andarist · Apr 28, 2022 · Apr 16, 2022 · Apr 16, 2022 · Apr 16, 2022
diff --git a/.changeset/five-balloons-sneeze.md b/.changeset/five-balloons-sneeze.md
@@ -0,0 +1,6 @@
+---
+'@emotion/cache': patch
+'@emotion/sheet': patch
+---
+
+The cache's `container` can be a `ShadowRoot`, or any other kind of `Node`
diff --git a/packages/cache/README.md b/packages/cache/README.md
@@ -51,7 +51,7 @@ The prefix before class names. It will also be set as the value of the `data-emo
 
 ### `container`
 
-`HTMLElement`
+`Node`
 
 A DOM node that emotion will insert all of its style tags into. This is useful for inserting styles into iframes or windows.
 

diff --git a/packages/cache/__tests__/__snapshots__/index.js.snap b/packages/cache/__tests__/__snapshots__/index.js.snap
@@ -1,5 +1,38 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`should accept container option 1`] = `
+.emotion-0 {
+  display: -webkit-box;
+  display: -webkit-flex;
+  display: -ms-flexbox;
+  display: flex;
+  color: blue;
+}
+
+<body>
+
+
+  <div
+    id="container"
+  >
+
+
+    <style
+      data-emotion="test-container"
+      data-s=""
+    >
+
+      .emotion-0{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;color:blue;}
+    </style>
+  </div>
+  <div>
+    <div
+      class="emotion-0"
+    />
+  </div>
+</body>
+`;
+
 exports[`should accept insertionPoint option 1`] = `
 <head>
 

diff --git a/packages/cache/__tests__/index.js b/packages/cache/__tests__/index.js
@@ -34,3 +34,24 @@ it('should accept insertionPoint option', () => {
 
   expect(document.head).toMatchSnapshot()
 })
+
+it('should accept container option', () => {
+  const body = safeQuerySelector('body')
+
+  body.innerHTML = `
+    <div id="container" />
+  `
+
+  const cache = createCache({
+    key: 'test-container',
+    container: safeQuerySelector('#container')
+  })
+
+  render(
+    <CacheProvider value={cache}>
+      <div css={{ display: 'flex', color: 'blue' }} />
+    </CacheProvider>
+  )
+
+  expect(document.body).toMatchSnapshot()
+})
diff --git a/packages/cache/src/index.js b/packages/cache/src/index.js
@@ -92,8 +92,7 @@ let createCache = (options: Options): EmotionCache => {
     }
   }
   let inserted = {}
-  // $FlowFixMe
-  let container: HTMLElement
+  let container: Node
   const nodesToHydrate = []
   if (isBrowser) {
     container = options.container || ((document.head: any): HTMLHeadElement)
@@ -250,7 +249,7 @@ let createCache = (options: Options): EmotionCache => {
     key,
     sheet: new StyleSheet({
       key,
-      container: ((container: any): HTMLElement),
+      container: ((container: any): Node),
       nonce: options.nonce,
       speedy: options.speedy,
       prepend: options.prepend,

diff --git a/packages/cache/types/index.d.ts b/packages/cache/types/index.d.ts
@@ -34,7 +34,7 @@ export interface Options {
   nonce?: string
   stylisPlugins?: Array<StylisPlugin>
   key: string
-  container?: HTMLElement
+  container?: Node
   speedy?: boolean
   /** @deprecate use `insertionPoint` instead */
   prepend?: boolean

diff --git a/packages/sheet/README.md b/packages/sheet/README.md
@@ -25,7 +25,7 @@ sheet.insert('html { color: hotpink; }')
 type Options = {
   nonce?: string
   key: string
-  container: HTMLElement
+  container: Node
   speedy?: boolean
   prepend?: boolean
 }

diff --git a/packages/sheet/__tests__/__snapshots__/index.js.snap b/packages/sheet/__tests__/__snapshots__/index.js.snap
@@ -271,3 +271,24 @@ exports[`StyleSheet should work if insertionPoint is last element 1`] = `
   <body />
 </html>
 `;
+
+exports[`StyleSheet should work with a ShadowRoot container 1`] = `
+<html>
+  <head />
+  <body>
+    <div />
+  </body>
+</html>
+`;
+
+exports[`StyleSheet should work with a ShadowRoot container 2`] = `
+HTMLCollection [
+  <style
+    data-emotion=""
+    data-s=""
+  >
+
+    html { color: hotpink; }
+  </style>,
+]
+`;
diff --git a/packages/sheet/__tests__/index.js b/packages/sheet/__tests__/index.js
@@ -105,6 +105,23 @@ describe('StyleSheet', () => {
     sheet.flush()
   })
 
+  it('should work with a ShadowRoot container', () => {
+    const div = document.createElement('div')
+    // $FlowFixMe
+    document.body.appendChild(div)
+    const container = div.attachShadow({ mode: 'open' })
+    const sheet = new StyleSheet({ ...defaultOptions, container })
+    expect(sheet.container).toBe(container)
+    sheet.insert(rule)
+    expect(document.documentElement).toMatchSnapshot()
+    // The shadowRoot is not serialized in the snapshot, so we need to take a
+    // separate snapshot of the shadowRoot's children.
+    expect(container.children).toMatchSnapshot()
+    expect(sheet.tags).toHaveLength(1)
+    expect(sheet.tags[0].parentNode).toBe(container)
+    sheet.flush()
+  })
+
   it('should accept prepend option', () => {
     const head = safeQuerySelector('head')
     const otherStyle = document.createElement('style')

diff --git a/packages/sheet/src/index.js b/packages/sheet/src/index.js
@@ -42,7 +42,7 @@ function sheetForTag(tag: HTMLStyleElement): CSSStyleSheet {
 export type Options = {
   nonce?: string,
   key: string,
-  container: HTMLElement,
+  container: Node,
   speedy?: boolean,
   prepend?: boolean,
   insertionPoint?: HTMLElement
@@ -66,7 +66,7 @@ export class StyleSheet {
   isSpeedy: boolean
   ctr: number
   tags: HTMLStyleElement[]
-  container: HTMLElement
+  container: Node
   key: string
   nonce: string | void
   prepend: boolean | void

diff --git a/packages/sheet/types/index.d.ts b/packages/sheet/types/index.d.ts
@@ -4,7 +4,7 @@
 export interface Options {
   nonce?: string
   key: string
-  container: HTMLElement
+  container: Node
   speedy?: boolean
   /** @deprecate use `insertionPoint` instead */
   prepend?: boolean
@@ -15,7 +15,7 @@ export class StyleSheet {
   isSpeedy: boolean
   ctr: number
   tags: Array<HTMLStyleElement>
-  container: HTMLElement
+  container: Node
   key: string
   nonce?: string
   before?: Element | null