fix(compiler-sfc): only transform relative asset URLs (#628)

packages/compiler-sfc/__tests__/__snapshots__/templateTransformAssetUrl.spec.ts.snap

@@ -33,7 +33,9 @@ export function render() {
   return (openBlock(), createBlock(Fragment, null, [
     createVNode(\\"img\\", { src: _imports_0 }),
     createVNode(\\"img\\", { src: _imports_1 }),
-    createVNode(\\"img\\", { src: _imports_1 })
+    createVNode(\\"img\\", { src: _imports_1 }),
+    createVNode(\\"img\\", { src: \\"http://example.com/fixtures/logo.png\\" }),
+    createVNode(\\"img\\", { src: \\"/fixtures/logo.png\\" })
   ], 64 /* STABLE_FRAGMENT */))
 }"
 `;

packages/compiler-sfc/__tests__/__snapshots__/templateTransformSrcset.spec.ts.snap

@@ -12,6 +12,7 @@ const _hoisted_4 = _imports_0 + ', ' + _imports_0 + '2x'
 const _hoisted_5 = _imports_0 + '2x, ' + _imports_0
 const _hoisted_6 = _imports_0 + '2x, ' + _imports_0 + '3x'
 const _hoisted_7 = _imports_0 + ', ' + _imports_0 + '2x, ' + _imports_0 + '3x'
+const _hoisted_8 = \\"/logo.png\\" + ', ' + _imports_0 + '2x'
 
 export function render() {
   const _ctx = this
@@ -43,6 +44,18 @@ export function render() {
     createVNode(\\"img\\", {
       src: \\"./logo.png\\",
       srcset: _hoisted_7
+    }),
+    createVNode(\\"img\\", {
+      src: \\"/logo.png\\",
+      srcset: \\"/logo.png, /logo.png 2x\\"
+    }),
+    createVNode(\\"img\\", {
+      src: \\"https://example.com/logo.png\\",
+      srcset: \\"https://example.com/logo.png, https://example.com/logo.png 2x\\"
+    }),
+    createVNode(\\"img\\", {
+      src: \\"/logo.png\\",
+      srcset: _hoisted_8
     })
   ], 64 /* STABLE_FRAGMENT */))
 }"

packages/compiler-sfc/__tests__/compileTemplate.spec.ts

@@ -50,7 +50,7 @@ test('warn missing preprocessor', () => {
 })
 
 test('transform asset url options', () => {
-  const input = { source: `<foo bar="baz"/>`, filename: 'example.vue' }
+  const input = { source: `<foo bar="~baz"/>`, filename: 'example.vue' }
   // Object option
   const { code: code1 } = compileTemplate({
     ...input,

packages/compiler-sfc/__tests__/templateTransformAssetUrl.spec.ts

@@ -20,6 +20,8 @@ describe('compiler sfc: transform asset url', () => {
 			<img src="./logo.png"/>
 			<img src="~fixtures/logo.png"/>
 			<img src="~/fixtures/logo.png"/>
+			<img src="http://example.com/fixtures/logo.png"/>
+			<img src="/fixtures/logo.png"/>
 		`)
 
     expect(result.code).toMatchSnapshot()

packages/compiler-sfc/__tests__/templateTransformSrcset.spec.ts

@@ -24,6 +24,9 @@ describe('compiler sfc: transform srcset', () => {
 			<img src="./logo.png" srcset="./logo.png 2x, ./logo.png"/>
 			<img src="./logo.png" srcset="./logo.png 2x, ./logo.png 3x"/>
 			<img src="./logo.png" srcset="./logo.png, ./logo.png 2x, ./logo.png 3x"/>
+			<img src="/logo.png" srcset="/logo.png, /logo.png 2x"/>
+			<img src="https://example.com/logo.png" srcset="https://example.com/logo.png, https://example.com/logo.png 2x"/>
+			<img src="/logo.png" srcset="/logo.png, ./logo.png 2x"/>
 		`)
 
     expect(result.code).toMatchSnapshot()

packages/compiler-sfc/src/templateTransformAssetUrl.ts

@@ -7,7 +7,7 @@ import {
   SourceLocation,
   TransformContext
 } from '@vue/compiler-core'
-import { parseUrl } from './templateUtils'
+import { isRelativeUrl, parseUrl } from './templateUtils'
 
 export interface AssetURLOptions {
   [name: string]: string[]
@@ -46,6 +46,7 @@ export const transformAssetUrl: NodeTransform = (
             if (attr.type !== NodeTypes.ATTRIBUTE) return
             if (attr.name !== item) return
             if (!attr.value) return
+            if (!isRelativeUrl(attr.value.content)) return
             const url = parseUrl(attr.value.content)
             const exp = getImportsExpressionExp(
               url.path,

packages/compiler-sfc/src/templateTransformSrcset.ts

@@ -5,7 +5,7 @@ import {
   NodeTypes,
   SimpleExpressionNode
 } from '@vue/compiler-core'
-import { parseUrl } from './templateUtils'
+import { isRelativeUrl, parseUrl } from './templateUtils'
 
 const srcsetTags = ['img', 'source']
 
@@ -36,8 +36,12 @@ export const transformSrcset: NodeTransform = (node, context) => {
             return { url, descriptor }
           })
 
+          // When srcset does not contain any relative URLs, skip transforming
+          if (!imageCandidates.some(({ url }) => isRelativeUrl(url))) return
+
           const compoundExpression = createCompoundExpression([], attr.loc)
           imageCandidates.forEach(({ url, descriptor }, index) => {
+            if (isRelativeUrl(url)) {
               const { path } = parseUrl(url)
               let exp: SimpleExpressionNode
               if (path) {
@@ -63,6 +67,15 @@ export const transformSrcset: NodeTransform = (node, context) => {
                 }
                 compoundExpression.children.push(exp)
               }
+            } else {
+              const exp = createSimpleExpression(
+                `"${url}"`,
+                false,
+                attr.loc,
+                true
+              )
+              compoundExpression.children.push(exp)
+            }
             const isNotLast = imageCandidates.length - 1 > index
             if (descriptor && isNotLast) {
               compoundExpression.children.push(` + '${descriptor}, ' + `)

packages/compiler-sfc/src/templateUtils.ts

@@ -1,16 +1,19 @@
 import { UrlWithStringQuery, parse as uriParse } from 'url'
 import { isString } from '@vue/shared'
 
+export function isRelativeUrl(url: string): boolean {
+  const firstChar = url.charAt(0)
+  return firstChar === '.' || firstChar === '~' || firstChar === '@'
+}
+
 // We need an extra transform context API for injecting arbitrary import
 // statements.
 export function parseUrl(url: string): UrlWithStringQuery {
   const firstChar = url.charAt(0)
-  if (firstChar === '.' || firstChar === '~' || firstChar === '@') {
   if (firstChar === '~') {
     const secondChar = url.charAt(1)
     url = url.slice(secondChar === '/' ? 2 : 1)
   }
-  }
   return parseUriParts(url)
 }