48 lines
1.4 KiB
JavaScript
48 lines
1.4 KiB
JavaScript
const URL = require("whatwg-url");
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const warning = require("warning");
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const origin = require("../serverConfig").origin;
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const bareIdentifierFormat = /^((?:@[^/]+\/)?[^/]+)(\/.*)?$/;
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function unpkgRewrite(dependencies = {}) {
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return {
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inherits: require("babel-plugin-syntax-export-extensions"),
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visitor: {
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"ImportDeclaration|ExportNamedDeclaration|ExportAllDeclaration"(path) {
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if (!path.node.source) return; // probably a variable declaration
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if (
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URL.parseURL(path.node.source.value) != null ||
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path.node.source.value.substr(0, 2) === "//"
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)
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return; // valid URL or URL w/o protocol, leave it alone
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if ([".", "/"].indexOf(path.node.source.value.charAt(0)) >= 0) {
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// local path
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path.node.source.value = `${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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const url = `${origin}/${packageName}@${version}${file}?module`;
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path.node.source.value = url;
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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 = unpkgRewrite;
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