* Move send-html function and rewrite in typescript
* Move getPageFiles and convert to ts
* Move getPageFiles and convert to ts (#5841)
* Move getPageFiles and convert to ts
# Conflicts:
# packages/next-server/server/render.js
* Fix unit tests
We don't have to check if the file already exists here, since it's always in production mode (dev overrides the readBuildId method to always be `development`) If the file is not found (error is thrown) we check if the file exists. If not we throw a helpful error. In other cases we throw the original error.
* Fix for locale.split is not a function.
Following from https://github.com/zeit/next.js/pull/5488
- Renamed languages to supportedLanguages
- Firstly, accept languages based on supportedLanguages
- And finally, accept a single language, if it returns false, the default of 'en' is used.
I looked at the navigator library, which is used by 'accept', this should be a more solid solution, since we can now know that `const locale` is always a string.
// Before (Sometimes returns an array as `const local`)
const locale = accept.language(languages) || 'en'
// After (Always returns a string)
const locale = accept.language(accept.languages(supportedLanguages)) || 'en';
* Update server.js
Update variable name.
Fixes#3705Fixes#4656
- No longer automatically dedupe certain tags. Only the ones we know are *never* going to be duplicate like charSet, title etc.
- Fix `key=""` behavior, making sure that if a unique key is provided tags are deduped based on that.
For example:
```jsx
<meta property='fb:pages' content='one'>
<meta property='fb:pages' content='two'>
```
Would currently cause
```jsx
<meta property='fb:pages' content='two'>
```
### After this change:
```jsx
<meta property='fb:pages' content='one'>
<meta property='fb:pages' content='two'>
```
Then if you use next/head multiple times / want to be able to override:
```jsx
<meta property='fb:pages' content='one' key="not-unique-key">
<meta property='fb:pages' content='two' key="not-unique-key">
```
Would cause:
```jsx
<meta property='fb:pages' content='two'>
```
As `key` gets deduped correctly after this PR, similar to how React itself works.
