Function registerVFS

lib/internal/vfs/setup.js:55–91

(vfs)

let vfsHandlerObj;

function registerVFS(vfs) {
  if (permission.isEnabled() && !getOptionValue('--allow-fs-vfs')) {
    throw new ERR_INVALID_STATE(
      'VFS cannot be used when the permission model is enabled. ' +
      'Use --allow-fs-vfs to allow it.',
    );
  }
  if (ArrayPrototypeIndexOf(activeVFSList, vfs) !== -1) return;

  const newMount = vfs.mountPoint;
  if (newMount != null) {
    for (let i = 0; i < activeVFSList.length; i++) {
      const existingMount = activeVFSList[i].mountPoint;
      if (existingMount == null) continue;
      // Use path.sep so the trailing-separator guard works on Windows where
      // mountPoint values are resolved to drive-letter / backslash paths.
      const newPrefix = newMount === sep ? sep : newMount + sep;
      const existingPrefix = existingMount === sep ? sep : existingMount + sep;
      if (newMount === existingMount ||
          StringPrototypeStartsWith(newMount, existingPrefix) ||
          StringPrototypeStartsWith(existingMount, newPrefix)) {
        throw new ERR_INVALID_STATE(
          `VFS mount '${newMount}' overlaps with existing mount '${existingMount}'`,
        );
      }
    }
  }
  ArrayPrototypePush(activeVFSList, vfs);
  debug('register mount=%s active=%d', newMount, activeVFSList.length);
  if (!hooksInstalled) {
    vfsHandlerObj = createVfsHandlers();
    setVfsHandlers(vfsHandlerObj);
    hooksInstalled = true;
  } else if (vfsState.handlers === null) {
    setVfsHandlers(vfsHandlerObj);
  }
}

function deregisterVFS(vfs) {
  const index = ArrayPrototypeIndexOf(activeVFSList, vfs);