refactor: enforce import directions and expose source factories

scripts/module-analysis.mjs

@@ -0,0 +1,80 @@
+import { parsers } from 'prettier/plugins/babel.mjs';
+
+const browserGlobals = new Set([
+  'window',
+  'document',
+  'navigator',
+  'HTMLElement',
+  'HTMLCanvasElement',
+  'Image',
+  'Audio',
+  'localStorage',
+  'sessionStorage',
+  'requestAnimationFrame',
+  'cancelAnimationFrame',
+  'getComputedStyle',
+]);
+
+/** Inspect literal module dependencies and browser-platform references without executing code. */
+export function analyzeModule(source) {
+  const imports = [];
+  const browser = new Set();
+  function walk(node, parent, field) {
+    if (!node || typeof node !== 'object') return;
+    if (
+      [
+        'ImportDeclaration',
+        'ExportNamedDeclaration',
+        'ExportAllDeclaration',
+        'ImportExpression',
+      ].includes(node.type) &&
+      node.source
+    ) {
+      if (node.source.type !== 'StringLiteral')
+        throw new Error(
+          'Computed module imports are not allowed in runtime code',
+        );
+      imports.push(node.source.value);
+    }
+    if (node.type === 'CallExpression' && node.callee?.name === 'require')
+      throw new Error('Runtime modules must use ES imports');
+    if (node.type === 'Identifier' && browserGlobals.has(node.name)) {
+      const property =
+        (parent?.type === 'MemberExpression' ||
+          parent?.type === 'OptionalMemberExpression') &&
+        field === 'property' &&
+        !parent.computed;
+      const key =
+        ['ObjectProperty', 'ObjectMethod', 'ClassMethod'].includes(
+          parent?.type,
+        ) &&
+        field === 'key' &&
+        !parent.computed;
+      const declaration =
+        field === 'id' ||
+        field === 'params' ||
+        parent?.type?.startsWith('Import');
+      if (!property && !key && !declaration) browser.add(node.name);
+    }
+    if (
+      ['MemberExpression', 'OptionalMemberExpression'].includes(node.type) &&
+      ['globalThis', 'self'].includes(node.object?.name)
+    ) {
+      const name = node.computed ? node.property?.value : node.property?.name;
+      if (browserGlobals.has(name)) browser.add(name);
+    }
+    for (const [key, value] of Object.entries(node)) {
+      if (['loc', 'comments', 'tokens', 'extra'].includes(key)) continue;
+      if (Array.isArray(value))
+        value.forEach((child) => walk(child, node, key));
+      else if (value && typeof value === 'object') walk(value, node, key);
+    }
+  }
+  walk(parsers.babel.parse(source));
+  return { imports, browser: [...browser] };
+}
+
+/** Return static imports, literal dynamic imports and re-exports. */
+export function moduleImports(source) {
+  return analyzeModule(source).imports;
+}