45 lines
1.4 KiB
JavaScript
45 lines
1.4 KiB
JavaScript
const URL = require("whatwg-url")
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const warning = require("warning")
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const BareIdentifierFormat = /^((?:@[^\/]+\/)?[^\/]+)(\/.*)?$/
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function unpkgRewriteBabelPlugin(dependencies = {}) {
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return {
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inherits: require("babel-plugin-syntax-export-extensions"),
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visitor: {
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"ImportDeclaration|ExportNamedDeclaration|ExportAllDeclaration"(path) {
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if (!path.node.source) return // probably a variable declaration
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if (
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URL.parseURL(path.node.source.value) != null ||
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path.node.source.value.substr(0, 2) === "//"
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)
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return // valid URL or URL w/o protocol, leave it alone
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if ([".", "/"].indexOf(path.node.source.value.charAt(0)) >= 0) {
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// local path
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path.node.source.value = `${path.node.source.value}?module`
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} else {
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// "bare" identifier
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const match = BareIdentifierFormat.exec(path.node.source.value)
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const packageName = match[1]
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const file = match[2] || ""
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warning(
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dependencies[packageName],
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'Missing version info for package "%s" in dependencies; falling back to "latest"',
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packageName
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)
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const version = dependencies[packageName] || "latest"
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path.node.source.value = `https://unpkg.com/${packageName}@${version}${file}?module`
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}
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}
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}
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}
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}
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module.exports = unpkgRewriteBabelPlugin
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