This pull requests adds a new parser option `lwc`. This is the same as the HTML parser, but it adds support for unquoted HTML attributes per the needs of LWC. See: #5627
- whitespace-sensitive formatting
- respect css `display: block`/`white-space: pre` (data from [`html-styles`](https://github.com/marionebl/html-styles))
- support magic comment (`<!-- display: block -->`)
- add an option to specify whitespace sensitivity (`--html-whitespace-sensitivity <css|strict|ignore>`)
- magic comments take precedence
- (default) `css`: respect default css style (safe in the most cases)
- `strict`: every node is considered whitespace sensitive (the safest)
- `ignore`: every node is considered whitespace insensitive (dangerous, the original behavior)
- inline inline-tags
- support ie conditional comment (`<!--[if IE]><![endif]-->`)
- indent the script/style content
- no inconsistent output for 2+ attributes
- force break tag if there're multiline attributes
- switch to [`htmlparser2`](https://github.com/fb55/htmlparser2)
- no need to fork
- won't generate pseudo nodes ([`parse5` will](https://github.com/prettier/prettier/issues/5098#issuecomment-423055181))
- should be [faster](https://github.com/fb55/htmlparser2#performance)
- support custom self-closing tags
- support HTML entities
- remove extra trailing newline for `<template>`
- distinguish empty/empty-string attributes (`<tag x>`/`<tag x="">`)
- rename `--parser parse5` with `--parser html`
- enable `html` since 1.15, which means it's enabled by default if you install the dev version from GitHub after this PR merged.
The issue here is that the `stripTrailingHardline` does not work for js/ts, I fixed it and then I realized that we always print trailing newline in every language, so there's no need to strip newline for text in script-like tag.
* feat: html support
* fix: support empty lines between children
* refactor: isScriptTagNode util
* refactor: rename `glimmer` and `handlebars` tests
* fix don't add newline after `directive` node
* fix: support `pre` tag
* fix: don't trim comments content
* fix: `script` and `style` tags output
* feat: indent `head` and `body` inside `html`
* fix: better handle quotes around attribute value
* feat: better handle embed
* tests: svg into html
* fix: better handle boolean and empty attributes
* chore(deps): update `parse5` to latest version
* fix: better handle empty attribute
* tests: fix
* fix: extra newline in multiline node
* fix: print `pre` and `textarea` in right way
* tests: xhtml doctype
* fix: use `>` instead `/>`
* tests: case
* refactor: remove `toLowerCase()`
* feat: support `prettier-ignore`
* tests: empty `script` and `style` tags
* fix: clean
* tests: refactor and more
Georgii Dolzhykov