Created
October 19, 2019 10:59
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Rollup plugin to rename imports in an ES modules
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/** | |
* @example | |
* // rename 'preact' as 'https://cdn.pika.dev/preact/^8.5.2' | |
* // and set 'https://cdn.pika.dev/preact/^8.5.2' as external | |
* renameImports({ 'preact': 'https://cdn.pika.dev/preact/^8.5.2' }) | |
*/ | |
export default function renameImports(packages = {}) { | |
return { | |
name: 'rename-imports', | |
transform(code) { | |
for (let npm in packages) { | |
const cdn = packages[npm] | |
const regex = new RegExp( | |
`^import(?:["'\\s]*([\\w*{}\\n, ]+)(from)\\s*)?\\s*(["'\\s]${npm}["'\\s])`, | |
'm' | |
) | |
return code.replace(regex, `import $1$2 '${cdn}'`) | |
} | |
}, | |
options(opts) { | |
const external = Object.values(packages) | |
return Object.assign({}, opts, { external }) | |
} | |
} | |
} |
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