Download files

app.js

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+function log(message, cls = 'cyan') {
+  const el = document.createElement('pre')
+  el.classList.add(cls)
+  el.innerText = message
+  document.body.append(el)
+}
+
+class App {
+  jApiBaseUrl = 'https://data.jsdelivr.com/v1/'
+  jCdnBaseUrl = 'https://cdn.jsdelivr.net/npm/'
+
+  scripts = {
+    '@rollup/browser': {
+      version: '3.20.4',
+      path: 'dist/rollup.browser.js',
+      sha: 'sha256-GgOznxZmgghx1a7CH09B+VmDKtziPO5tAnC5gC+/5Kw=',
+    },
+  }
+
+  topLevelDeps = [
+    "@codemirror/autocomplete",
+    "@codemirror/commands",
+    "@codemirror/language",
+    "@codemirror/lint",
+    "@codemirror/search",
+    "@codemirror/state",
+    "@codemirror/view",
+    "@codemirror/lang-javascript",
+  ]
+
+  constructor() {
+    this.downloads = []
+    this.run().catch(e => {
+      log(`${e}`)
+    })
+  }
+
+  checkOk(resp) {
+    if (!resp.ok) {
+      throw new Error(`HTTP request failed: ${resp.status}`)
+    }
+  }
+
+  async loadDep(dep) {
+    this.scripts[dep] = {}
+    const dataResp = await fetch(
+      this.jApiBaseUrl +
+      `packages/npm/${dep}/resolved`,
+      {
+        headers: {
+          'User-Agent':
+            'https://codeberg.org/macchiato',
+        },
+      },
+    )
+    this.checkOk(dataResp)
+    const {version} = await dataResp.json()
+    this.scripts[dep].version = version
+    const pkgResp = await fetch(
+      this.jCdnBaseUrl +
+      `${dep}@${version}/package.json`
+    )
+    this.checkOk(pkgResp)
+    log(dep)
+    const pkg = await pkgResp.json()
+    this.scripts[dep].path = (
+      pkg.module ?? pkg.main
+    )
+    this.downloads.push(this.getScript(dep))
+    const deps = Object.keys(
+      pkg.dependencies || {}
+    ).filter(dep => !(dep in this.scripts))
+    await Promise.allSettled(deps.map(dep => (
+      this.loadDep(dep)
+    )))
+  }
+
+  async checkIntegrity(resp, name, script) {
+    const blob = await resp.blob()
+    const ab = await blob.arrayBuffer()
+    const hash = await crypto.subtle.digest(
+      "SHA-256", ab
+    )
+    const checkValue = 'sha256-' + btoa(
+      String.fromCharCode(
+        ...new Uint8Array(hash)
+      )
+    )
+    if (checkValue !== script.sha) {
+      throw new Error(
+        'failed integrity check: ' +
+        `${checkValue} !== ${script.sha}`
+      )
+    }
+    return ab
+  }
+
+  async getScript(name) {
+    log('[downloading] ' + name, 'green')
+    const script = this.scripts[name]
+    if (script.text) {
+      return script.text
+    }
+    const url = (
+      this.jCdnBaseUrl +
+      `${name}@${script.version}/${script.path}`
+    )
+    const resp = await fetch(url)
+    this.checkOk(resp)
+    if (script.sha) {
+      const ab = await this.checkIntegrity(
+        resp, name, script
+      )
+      script.text = new TextDecoder().decode(ab)
+    } else {
+      script.text = await resp.text
+      script.sha = resp.integrity
+    }
+    log('[downloaded] ' + url, 'green')
+    return script.text
+  }
+
+  async loadScript(name) {
+    const text = await this.getScript(name)
+    const s = document.createElement('script')
+    s.text = text
+    document.head.append(s)
+  }
+
+  async run() {
+    await Promise.allSettled(
+      this.topLevelDeps.map(dep => (
+        this.loadDep(dep)
+      ))
+    )
+    await Promise.allSettled(this.downloads)
+    //await this.loadScript('@rollup/browser')
+    //const { rollup } = window.rollup
+    //output.value = `${typeof rollup}`
+  }
+}
+
+new App()

style.css

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+html, body {
+  min-height: 100%;
+}
+
+body {
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  padding: 0;
+  margin: 0;
+  background: navy;
+  margin: 10px;
+  gap: 10px;
+}
+
+pre {
+  padding: 8px;
+  border-radius: 5px;
+  margin: 0;
+  overflow-x: auto;
+}
+
+pre.cyan {
+ background: cyan;
+}
+
+pre.green {
+  background: lightgreen;
+}