Function getFormatOfExtensionlessFile

lib/internal/modules/esm/get_format.js:60–68

* For extensionless files in a `module` package scope, we check the file contents to disambiguate between ES module * JavaScript and Wasm. * We do this by taking advantage of the fact that all Wasm files start with the header `0x00 0x61 0x73 0x6d` (`_asm`). * @param {URL} url * @returns {'wasm'|

(url)

 * @returns {'wasm'|'module'}
 */
function getFormatOfExtensionlessFile(url) {
  const path = getValidatedPath(url);
  switch (fsBindings.getFormatOfExtensionlessFile(path)) {
    case internalConstants.EXTENSIONLESS_FORMAT_WASM:
      return 'wasm';
    default:
      return 'module';
  }
}
const { containsModuleSyntax } = internalBinding('contextify');
const { getPackageScopeConfig, getPackageType } = require('internal/modules/package_json_reader');
const { fileURLToPath } = require('internal/url');