93 lines
2.3 KiB
JavaScript
93 lines
2.3 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 isValidURL(value) {
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return URL.parseURL(value) != null;
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}
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function isProbablyURLWithoutProtocol(value) {
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return value.substr(0, 2) === "//";
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}
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function isAbsoluteURL(value) {
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return isValidURL(value) || isProbablyURLWithoutProtocol(value);
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}
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function isBareIdentifier(value) {
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return value.charAt(0) !== "." && value.charAt(0) !== "/";
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}
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function rewriteValue(/* StringLiteral */ node, dependencies) {
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if (isAbsoluteURL(node.value)) {
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return;
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}
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if (isBareIdentifier(node.value)) {
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// "bare" identifier
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const match = bareIdentifierFormat.exec(node.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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node.value = `${origin}/${packageName}@${version}${file}?module`;
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} else {
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// local path
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node.value = `${node.value}?module`;
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}
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}
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function unpkgRewrite(dependencies = {}) {
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return {
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manipulateOptions(opts, parserOpts) {
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parserOpts.plugins.push(
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"dynamicImport",
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"exportDefaultFrom",
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"exportNamespaceFrom",
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"importMeta"
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);
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},
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visitor: {
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CallExpression(path) {
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if (path.node.callee.type !== "Import") {
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// Some other function call, not import();
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return;
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}
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rewriteValue(path.node.arguments[0], dependencies);
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},
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ExportAllDeclaration(path) {
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return rewriteValue(path.node.source, dependencies);
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},
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ExportNamedDeclaration(path) {
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if (!path.node.source) {
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// This export has no "source", so it's probably
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// a local variable or function, e.g.
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// export { varName }
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// export const constName = ...
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// export function funcName() {}
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return;
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}
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rewriteValue(path.node.source, dependencies);
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},
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ImportDeclaration(path) {
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return rewriteValue(path.node.source, dependencies);
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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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