@linaria/utils/esm/options/loadBabelOptions.js

Blazing fast zero-runtime CSS in JS library

const cache = new WeakMap();
const empty = {};
export default function loadBabelOptions(babel, filename, overrides = empty) {
  const fileCache = cache.get(overrides) ?? new Map();
  if (fileCache.has(filename)) {
    return fileCache.get(filename);
  }
  const babelOptions = babel.loadOptions({
    ...overrides,
    filename,
    caller: {
      name: 'linaria',
      // Indicates for @babel/preset-env to support all ESM syntax and avoid transforms before it's needed
      supportsStaticESM: true,
      supportsDynamicImport: true,
      supportsTopLevelAwait: true,
      supportsExportNamespaceFrom: true
    }
  }) ?? {};
  fileCache.set(filename, babelOptions);
  cache.set(overrides, fileCache);
  return babelOptions;
}
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