Created
March 11, 2020 10:33
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| import posthtml from 'posthtml' | |
| export default { | |
| async rendered(response, context, app) { | |
| // TODO try to use route meta instead? | |
| if (context.url.endsWith('/amp')) { | |
| const html = response.body | |
| const transform = new TransformHTML(html) | |
| response.body = await transform.transform() | |
| } | |
| }, | |
| } | |
| class TransformHTML { | |
| constructor(html) { | |
| this.html = html | |
| // TODO move this to separate files | |
| this.AMPScript = `<script async src='https://cdn.ampproject.org/v0.js'></script>` | |
| this.AMPStyle = ` | |
| <style amp-boilerplate> | |
| body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}} | |
| </style> | |
| <noscript> | |
| <style amp-boilerplate> | |
| body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none} | |
| </style> | |
| </noscript> | |
| ` | |
| this.plugin = new TransformHTMLPlugin() | |
| } | |
| async transform() { | |
| return posthtml([ | |
| require('posthtml-minifier')({ | |
| removeComments: true, | |
| minifyJS: true, | |
| minifyCSS: true, | |
| }), | |
| require('posthtml-collect-styles')(), | |
| this.plugin.transform(), | |
| require('posthtml-insert-at').default([ | |
| { | |
| selector: 'title', | |
| append: this.AMPScript, | |
| behavior: 'outside', | |
| }, | |
| { | |
| selector: 'title', | |
| append: this.AMPStyle, | |
| behavior: 'outside', | |
| }, | |
| ]), | |
| ]) | |
| .process(this.html) | |
| .then(result => result.html) | |
| .catch(error => { | |
| console.log({ error }) | |
| }) | |
| } | |
| } | |
| class TransformHTMLPlugin { | |
| constructor() { | |
| this.attrsToDelete = [ | |
| 'data-vue-meta', | |
| 'data-server-rendered', | |
| ] | |
| } | |
| transform() { | |
| return tree => { | |
| this.rootAttrs(tree) | |
| this.removeAttrs(tree) | |
| this.removeLinks(tree) | |
| this.removeScripts(tree) | |
| this.AMP(tree) | |
| return tree | |
| } | |
| } | |
| rootAttrs(tree) { | |
| tree.match({ tag: 'html' }, html => { | |
| delete html.attrs['data-vue-meta-server-rendered'] | |
| delete html.attrs['data-vue-meta'] | |
| html.attrs['amp'] = '' | |
| return html | |
| }) | |
| } | |
| removeAttrs(tree) { | |
| tree.walk(node => { | |
| if (node && node.attrs) { | |
| this.attrsToDelete.forEach(attr => { | |
| if (this.attrsToDelete.some(attrToDelete => attrToDelete === attr)) { | |
| delete node.attrs[attr] | |
| } | |
| }) | |
| } | |
| return node | |
| }) | |
| } | |
| removeLinks(tree) { | |
| tree.match({ tag: 'link' }, link => { | |
| if ( | |
| link.attrs && | |
| ( | |
| link.attrs['rel'] === 'preload' || | |
| link.attrs['rel'] === 'prefetch' | |
| ) | |
| ) { | |
| return '' | |
| } | |
| return link | |
| }) | |
| } | |
| removeScripts(tree) { | |
| tree.match({ tag: 'body' }, body => { | |
| body.content = body.content.map(child => { | |
| if ( | |
| typeof child === 'object' && | |
| child.tag === 'script' | |
| ) { | |
| return '' | |
| } | |
| return child | |
| }) | |
| return body | |
| }) | |
| } | |
| AMP(tree) { | |
| tree.match({ tag: 'style' }, style => { | |
| if (!style.attrs) { | |
| style.attrs = {} | |
| } | |
| style.attrs['amp-custom'] = '' | |
| return style | |
| }) | |
| // TODO use amp-img instead of <img> and/or <picture> | |
| tree.match({ tag: 'img' }, img => { | |
| img.tag = 'amp-img' | |
| return img | |
| }) | |
| } | |
| } |
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