emscripten-wasm-loader/src/path/isMounted.ts

Common interface to load wasm module into isomorphic environment

import { FS } from '../BaseAsmModule';
import { log } from '../util/logger';

/**
 * Check if given mount path is already mounted
 *
 * @param {FS} FS wasm module filesystem
 * @param {string} mountPath path to wasm filesystem
 * @param {dir | file} type type of mountPath
 *
 * @returns {boolean} true if mounted, false otherwise or error occurred
 */
const isMounted = (FS: FS, mountPath: string, type: 'dir' | 'file'): boolean => {
  try {
    const stat = FS.stat(mountPath);
    const typeFunction = type === 'dir' ? FS.isDir : FS.isFile;

    if (!!stat && typeFunction(stat.mode)) {
      log(`isMounted: ${mountPath} is mounted`);
      return true;
    }
  } catch (e) {
    if (e.code !== 'ENOENT') {
      log(`isMounted check failed`, e);
    }
  }

  return false;
};

export { isMounted };