Function registerExtension

src/index.ts:1600–1623

* Register the extension for node.

(
  ext: string,
  service: Service,
  originalHandler: (m: NodeModule, filename: string) => any
)

 * Register the extension for node.
 */
function registerExtension(
  ext: string,
  service: Service,
  originalHandler: (m: NodeModule, filename: string) => any
) {
  const old = require.extensions[ext] || originalHandler;

  require.extensions[ext] = function (m: any, filename) {
    if (service.ignored(filename)) return old(m, filename);

    assertScriptCanLoadAsCJS(service, m, filename);

    const _compile = m._compile;

    m._compile = function (code: string, fileName: string) {
      debug('module._compile', fileName);

      const result = service.compile(code, fileName);
      return _compile.call(this, result, fileName);
    };

    return old(m, filename);
  };
}

/**
 * Internal source output.