71 lines
1.8 KiB
JavaScript
71 lines
1.8 KiB
JavaScript
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const etag = require("etag");
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const babel = require("babel-core");
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const getContentTypeHeader = require("../utils/getContentTypeHeader");
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const unpkgRewrite = require("../plugins/unpkgRewrite");
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function rewriteBareModuleIdentifiers(code, packageConfig) {
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const dependencies = Object.assign(
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{},
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packageConfig.peerDependencies,
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packageConfig.dependencies
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);
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const options = {
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// Ignore .babelrc and package.json babel config
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// because we haven't installed dependencies so
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// we can't load plugins; see #84
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babelrc: false,
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plugins: [unpkgRewrite(dependencies)]
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};
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return babel.transform(code, options).code;
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}
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function serveJavaScriptModule(req, res) {
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if (req.entry.contentType !== "application/javascript") {
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return res
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.status(403)
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.type("text")
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.send("?module mode is available only for JavaScript files");
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}
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try {
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const code = rewriteBareModuleIdentifiers(
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req.entry.content.toString("utf8"),
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req.packageConfig
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);
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res
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.set({
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"Content-Length": Buffer.byteLength(code),
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"Content-Type": getContentTypeHeader(req.entry.contentType),
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"Cache-Control": "public,max-age=31536000", // 1 year
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ETag: etag(code),
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"Cache-Tag": "file,js-file,js-module"
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})
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.send(code);
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} catch (error) {
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console.error(error);
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const errorName = error.constructor.name;
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const errorMessage = error.message.replace(
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/^.*?\/unpkg-.+?\//,
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`/${req.packageSpec}/`
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);
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const codeFrame = error.codeFrame;
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const debugInfo = `${errorName}: ${errorMessage}\n\n${codeFrame}`;
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res
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.status(500)
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.type("text")
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.send(
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`Cannot generate module for ${req.packageSpec}${
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req.filename
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}\n\n${debugInfo}`
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);
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}
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}
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module.exports = serveJavaScriptModule;
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