Fixes#3494
Removes `class="next-head"` from the children of the `<Head>` component. Instead, a single sentinel meta element named `next-head-count` is appended. The content is the number of contiguous elements immediately preceding the sentinel that _would have had_ the `class="next-head"` attribute.
During an update, instead of searching for `class="next-head"`, the sentinel is located and the N previous elements are considered candidates for `oldTags`. New elements are inserted before the sentinel, and finally the sentinel is updated to reflect the new count.
* App, Document, Page, Error types description
* Router description
* Added head changed router
* Additions
* Fix examples
* Push and replace details
* Update packages/next-server/lib/head.tsx
Co-Authored-By: Luis Fernando Alvarez D. <luis@zeit.co>
* Update packages/next-server/lib/utils.ts
Co-Authored-By: Luis Fernando Alvarez D. <luis@zeit.co>
* Update packages/next/types/index.d.ts
Co-Authored-By: Luis Fernando Alvarez D. <luis@zeit.co>
* Update packages/next/pages/_document.tsx
Co-Authored-By: Luis Fernando Alvarez D. <luis@zeit.co>
* Update packages/next/pages/_document.tsx
Co-Authored-By: Luis Fernando Alvarez D. <luis@zeit.co>
* Update packages/next/pages/_app.tsx
Co-Authored-By: Luis Fernando Alvarez D. <luis@zeit.co>
* Update packages/next/pages/_document.tsx
Co-Authored-By: Luis Fernando Alvarez D. <luis@zeit.co>
* Moved server/lib/utils.js to Typescript
* moved _app.js to Typescript
* Moved _error.js to Typescript
* Added argument for custom props in _app and _error
* Moved _document.js to Typescript
* updated one test
* Updated types and added a validation for _document props
* Improved types
* Fixed some types
* Updated AppType
* Fixed some tests
* Added missing import
* Removed a not very useful type
* Fix missing type
* Move @types/styled-jsx
* Fix typescript errors
* Add WithAmp to enable AMP support for
pages instead of .amp.js
* Update handling for exporting AMP
* Fix ampPath in export for / path and
revert isAmp logic to handle right
* Update amphtml test suite
* Add handling for noDirtyAmp during
export and update amp-export test suite
* Update serverless and export-default-map
test suites
* Update require-page tests
* Add default viewport meta tag (fixes#6698)
* Do not inject default viewport when rendering an AMP document
* Remove redundant viewport on error page
* Plumb withSideEffect() to pass through props, then use that for isAmp.
* Add tests for viewport meta tag.
* Fix linting
* Update dedupes test
