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Switch from defer to async #10143

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merged 2 commits into from Jan 17, 2020
Merged

Switch from defer to async #10143

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32c390a
Switch from `defer` to `async`
Timer Jan 17, 2020
9dd708c
Merge branch 'canary' into hotfix/defer-async
Timer Jan 17, 2020
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12 changes: 6 additions & 6 deletions packages/next/pages/_document.tsx
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Expand Up @@ -570,7 +570,7 @@ export class NextScript extends Component<OriginProps> {

return (
<script
defer
async
key={bundle.file}
src={`${assetPrefix}/_next/${encodeURI(
bundle.file
Expand Down Expand Up @@ -611,7 +611,7 @@ export class NextScript extends Component<OriginProps> {
file
)}${_devOnlyInvalidateCacheQueryString}`}
nonce={this.props.nonce}
defer
async
crossOrigin={this.props.crossOrigin || process.crossOrigin}
{...modernProps}
/>
Expand Down Expand Up @@ -720,7 +720,7 @@ export class NextScript extends Component<OriginProps> {

const pageScript = [
<script
defer
async
data-next-page={page}
key={page}
src={
Expand All @@ -734,7 +734,7 @@ export class NextScript extends Component<OriginProps> {
/>,
process.env.__NEXT_MODERN_BUILD && (
<script
defer
async
data-next-page={page}
key={`${page}-modern`}
src={
Expand All @@ -753,7 +753,7 @@ export class NextScript extends Component<OriginProps> {

const appScript = [
<script
defer
async
data-next-page="/_app"
src={
assetPrefix +
Expand All @@ -767,7 +767,7 @@ export class NextScript extends Component<OriginProps> {
/>,
process.env.__NEXT_MODERN_BUILD && (
<script
defer
async
data-next-page="/_app"
src={
assetPrefix +
Expand Down
6 changes: 3 additions & 3 deletions test/integration/production/test/index.test.js
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Expand Up @@ -678,21 +678,21 @@ describe('Production Usage', () => {
}
})

it('should have defer on all script tags', async () => {
it('should have async on all script tags', async () => {
const html = await renderViaHTTP(appPort, '/')
const $ = cheerio.load(html)
let missing = false

for (const script of $('script').toArray()) {
// application/json doesn't need defer
// application/json doesn't need async
if (
script.attribs.type === 'application/json' ||
script.attribs.src.includes('polyfills')
) {
continue
}

if (script.attribs.async === '' || script.attribs.defer !== '') {
if (script.attribs.defer === '' || script.attribs.async !== '') {
missing = true
}
}
Expand Down