Moved to http imports

build.js

@@ -0,0 +1,60 @@
+let httpPlugin = {
+    name: 'http',
+    setup(build) {
+      let https = require('https')
+      let http = require('http')
+
+      // Intercept import paths starting with "http:" and "https:" so
+      // esbuild doesn't attempt to map them to a file system location.
+      // Tag them with the "http-url" namespace to associate them with
+      // this plugin.
+      build.onResolve({ filter: /^https?:\/\// }, args => ({
+        path: args.path,
+        namespace: 'http-url',
+      }))
+
+      // We also want to intercept all import paths inside downloaded
+      // files and resolve them against the original URL. All of these
+      // files will be in the "http-url" namespace. Make sure to keep
+      // the newly resolved URL in the "http-url" namespace so imports
+      // inside it will also be resolved as URLs recursively.
+      build.onResolve({ filter: /.*/, namespace: 'http-url' }, args => ({
+        path: new URL(args.path, args.importer).toString(),
+        namespace: 'http-url',
+      }))
+
+      // When a URL is loaded, we want to actually download the content
+      // from the internet. This has just enough logic to be able to
+      // handle the example import from unpkg.com but in reality this
+      // would probably need to be more complex.
+      build.onLoad({ filter: /.*/, namespace: 'http-url' }, async (args) => {
+        let contents = await new Promise((resolve, reject) => {
+          function fetch(url) {
+            console.log(`Downloading: ${url}`)
+            let lib = url.startsWith('https') ? https : http
+            let req = lib.get(url, res => {
+              if ([301, 302, 307].includes(res.statusCode)) {
+                fetch(new URL(res.headers.location, url).toString())
+                req.abort()
+              } else if (res.statusCode === 200) {
+                let chunks = []
+                res.on('data', chunk => chunks.push(chunk))
+                res.on('end', () => resolve(Buffer.concat(chunks)))
+              } else {
+                reject(new Error(`GET ${url} failed: status ${res.statusCode}`))
+              }
+            }).on('error', reject)
+          }
+          fetch(args.path)
+        })
+        return { contents }
+      })
+    },
+  }
+
+  require('esbuild').build({
+    entryPoints: ['worker.js'],
+    bundle: true,
+    outfile: 'index.js',
+    plugins: [httpPlugin],
+  }).catch(() => process.exit(1))