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feat(bundler): support direct css import in js file
Support `import './foo.css';` directly in JavaScript. When you do `import './foo.css'` in `foo.js`, it behaves same as `<require from="./foo.css"></require>` in `foo.html`.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| 'use strict'; | ||
| let cssUrlMatcher = /url\s*\(\s*(?!['"]data)([^) ]+)\s*\)/gi; | ||
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| // copied from aurelia-templating-resources css-resource | ||
| // This behaves differently from webpack's style-loader. | ||
| // Here we change './hello.png' to 'foo/hello.png' if base address is 'foo/bar'. | ||
| // Note 'foo/hello.png' is technically a relative path in css, | ||
| // this is designed to work with aurelia-router setup. | ||
| // We inject css into a style tag on html head, it means the 'foo/hello.png' | ||
| // is related to current url (not css url on link tag), or <base> tag in html | ||
| // head (which is recommended setup of router if not using hash). | ||
| function fixupCSSUrls(address, css) { | ||
| if (typeof css !== 'string') { | ||
| throw new Error(`Failed loading required CSS file: ${address}`); | ||
| } | ||
| return css.replace(cssUrlMatcher, (match, p1) => { | ||
| let quote = p1.charAt(0); | ||
| if (quote === '\'' || quote === '"') { | ||
| p1 = p1.substr(1, p1.length - 2); | ||
| } | ||
| const absolutePath = absoluteModuleId(address, p1); | ||
| if (absolutePath === p1) { | ||
| return match; | ||
| } | ||
| return 'url(\'' + absolutePath + '\')'; | ||
| }); | ||
| } | ||
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| function absoluteModuleId(baseId, moduleId) { | ||
| if (moduleId[0] !== '.') return moduleId; | ||
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| let parts = baseId.split('/'); | ||
| parts.pop(); | ||
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| moduleId.split('/').forEach(p => { | ||
| if (p === '.') return; | ||
| if (p === '..') { | ||
| parts.pop(); | ||
| return; | ||
| } | ||
| parts.push(p); | ||
| }); | ||
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| return parts.join('/'); | ||
| } | ||
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| // copied from aurelia-pal-browser DOM.injectStyles | ||
| function injectCSS(css, id) { | ||
| if (typeof document === 'undefined' || !css) return; | ||
| css = fixupCSSUrls(id, css); | ||
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| if (id) { | ||
| let oldStyle = document.getElementById(id); | ||
| if (oldStyle) { | ||
| let isStyleTag = oldStyle.tagName.toLowerCase() === 'style'; | ||
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| if (isStyleTag) { | ||
| oldStyle.innerHTML = css; | ||
| return; | ||
| } | ||
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| throw new Error('The provided id does not indicate a style tag.'); | ||
| } | ||
| } | ||
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| let node = document.createElement('style'); | ||
| node.innerHTML = css; | ||
| node.type = 'text/css'; | ||
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| if (id) { | ||
| node.id = id; | ||
| } | ||
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| document.head.appendChild(node); | ||
| } | ||
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| injectCSS.fixupCSSUrls = fixupCSSUrls; | ||
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| module.exports = injectCSS; |
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