@ezdevlol/memfs/lib/index.js

In-memory file-system with Node's fs API.

import Stats from './Stats';
import Dirent from './Dirent';
import { Volume, toUnixTimestamp, } from './volume';
import { constants } from './constants';
import { fsSynchronousApiList } from './node/lists/fsSynchronousApiList';
import { fsCallbackApiList } from './node/lists/fsCallbackApiList';
const { F_OK, R_OK, W_OK, X_OK } = constants;
export { Volume };
// Default volume.
export const vol = new Volume();
export function createFsFromVolume(vol) {
    const fs = { F_OK, R_OK, W_OK, X_OK, constants, Stats, Dirent };
    // Bind FS methods.
    for (const method of fsSynchronousApiList)
        if (typeof vol[method] === 'function')
            fs[method] = vol[method].bind(vol);
    for (const method of fsCallbackApiList)
        if (typeof vol[method] === 'function')
            fs[method] = vol[method].bind(vol);
    fs.StatWatcher = vol.StatWatcher;
    fs.FSWatcher = vol.FSWatcher;
    fs.WriteStream = vol.WriteStream;
    fs.ReadStream = vol.ReadStream;
    fs.promises = vol.promises;
    // Handle realpath and realpathSync with their .native properties
    if (typeof vol.realpath === 'function') {
        fs.realpath = vol.realpath.bind(vol);
        if (typeof vol.realpath.native === 'function') {
            fs.realpath.native = vol.realpath.native.bind(vol);
        }
    }
    if (typeof vol.realpathSync === 'function') {
        fs.realpathSync = vol.realpathSync.bind(vol);
        if (typeof vol.realpathSync.native === 'function') {
            fs.realpathSync.native = vol.realpathSync.native.bind(vol);
        }
    }
    fs._toUnixTimestamp = toUnixTimestamp;
    fs.__vol = vol;
    return fs;
}
export const fs = createFsFromVolume(vol);
/**
 * Creates a new file system instance.
 *
 * @param json File system structure expressed as a JSON object.
 *        Use `null` for empty directories and empty string for empty files.
 * @param cwd Current working directory. The JSON structure will be created
 *        relative to this path.
 * @returns A `memfs` file system instance, which is a drop-in replacement for
 *          the `fs` module.
 */
export const memfs = (json = {}, cwd = '/') => {
    const vol = Volume.fromNestedJSON(json, cwd);
    const fs = createFsFromVolume(vol);
    return { fs, vol };
};