Function parseImports

src/javascript/imports.ts:128–145

(root: string, path: string)

const parseImportsCache = new Map<string, Promise<ImportReference[]>>();

export async function parseImports(root: string, path: string): Promise<ImportReference[]> {
  if (!isJavaScript(path)) return []; // TODO traverse CSS, too
  const filePath = join(root, path);
  let promise = parseImportsCache.get(filePath);
  if (promise) return promise;
  promise = (async function () {
    try {
      const source = await readFile(filePath, "utf-8");
      const body = parseProgram(source);
      return findImports(body, path, source);
    } catch (error: any) {
      console.warn(`unable to fetch or parse ${path}: ${error.message}`);
      return [];
    }
  })();
  parseImportsCache.set(filePath, promise);
  return promise;
}