How to use memfs - 10 common examples

it('should keep comments', () => {
		vol.fromJSON({ '/test.json': '{\n// pizza\n"bar": 42\n/* pasta */ }' });
		json(filename)
			.set('bar', 43)
			.save();
		expect(vol.toJSON()[filename]).toMatchSnapshot();
	});

it('returns class file with path', () => __awaiter(this, void 0, void 0, function* () {
        memfs_1.vol.mkdirpSync(localPluginDir); // local
        memfs_1.vol.writeFileSync(localPluginPackageFile, JSON.stringify(pkg)); // local
        const pkg2 = Object.assign({}, pkg); // copy properties
        pkg2.name += '-global';
        memfs_1.vol.mkdirpSync(globalPluginDir); // global
        memfs_1.vol.writeFileSync(globalPluginPackageFile, JSON.stringify(pkg2)); // global
        const finder = new PackageBasedPluginFinder_1.PackageBasedPluginFinder(currentDir, memfs_1.fs);
        const pluginData = yield finder.find();
        expect(pluginData).toHaveLength(2);
        const first = pluginData[0];
        expect(first.file).toContain(localPluginDir);
    }));
    it('ignores a package that is not a plugin', () => __awaiter(this, void 0, void 0, function* () {

it( 'prefers local than global', async () => {

        vol.mkdirpSync( localPluginDir ); // local
        vol.writeFileSync( localPluginPackageFile, JSON.stringify( pkg ) ); // local

        const pkg2 = { ... pkg }; // copy properties

        vol.mkdirpSync( globalPluginDir ); // global
        vol.writeFileSync( globalPluginPackageFile, JSON.stringify( pkg2 ) ); // global

        const finder: PackageBasedPluginFinder = new PackageBasedPluginFinder( currentDir, fs );
        const pluginData: PluginData[] = await finder.find();
        expect( pluginData ).toHaveLength( 1 );

        const first = pluginData[ 0 ];

        expect( first.name ).toEqual( pkg.name );
    } );

it( 'ignores a package that is not a plugin', async () => {

        vol.mkdirpSync( localPluginDir ); // local
        vol.writeFileSync( localPluginPackageFile, JSON.stringify( pkg ) ); // local

        const pkg2 = { ... pkg }; // copy properties
        pkg2.name += '-non-plugin';
        pkg2[ PLUGIN_PROPERTY ] = undefined; // removes the expected property

        vol.mkdirpSync( join( localModulesDir, pkg2.name ) );
        vol.writeFileSync( join( localModulesDir, pkg2.name, PKG_FILENAME ), JSON.stringify( pkg2 ) );

        const finder: PackageBasedPluginFinder = new PackageBasedPluginFinder( currentDir, fs );
        const pluginData: PluginData[] = await finder.find();
        expect( pluginData ).toHaveLength( 1 );
    } );

it( 'returns class file with path', async () => {

        vol.mkdirpSync( localPluginDir ); // local
        vol.writeFileSync( localPluginPackageFile, JSON.stringify( pkg ) ); // local

        const pkg2 = { ... pkg }; // copy properties
        pkg2.name += '-global';

        vol.mkdirpSync( globalPluginDir ); // global
        vol.writeFileSync( globalPluginPackageFile, JSON.stringify( pkg2 ) ); // global

        const finder: PackageBasedPluginFinder = new PackageBasedPluginFinder( currentDir, fs );
        const pluginData: PluginData[] = await finder.find();
        expect( pluginData ).toHaveLength( 2 );

        const first = pluginData[ 0 ];

        expect( first.file ).toContain( localPluginDir );
    } );

it( 'ignores a package that is not a plugin', async () => {

        vol.mkdirpSync( localPluginDir ); // local
        vol.writeFileSync( localPluginPackageFile, JSON.stringify( pkg ) ); // local

        const pkg2 = { ... pkg }; // copy properties
        pkg2.name += '-non-plugin';
        pkg2[ PLUGIN_PROPERTY ] = undefined; // removes the expected property

        vol.mkdirpSync( join( localModulesDir, pkg2.name ) );
        vol.writeFileSync( join( localModulesDir, pkg2.name, PKG_FILENAME ), JSON.stringify( pkg2 ) );

        const finder: PackageBasedPluginFinder = new PackageBasedPluginFinder( currentDir, fs );
        const pluginData: PluginData[] = await finder.find();
        expect( pluginData ).toHaveLength( 1 );
    } );

it( 'prefers local than global', async () => {

        vol.mkdirpSync( localPluginDir ); // local
        vol.writeFileSync( localPluginPackageFile, JSON.stringify( pkg ) ); // local

        const pkg2 = { ... pkg }; // copy properties

        vol.mkdirpSync( globalPluginDir ); // global
        vol.writeFileSync( globalPluginPackageFile, JSON.stringify( pkg2 ) ); // global

        const finder: PackageBasedPluginFinder = new PackageBasedPluginFinder( currentDir, fs );
        const pluginData: PluginData[] = await finder.find();
        expect( pluginData ).toHaveLength( 1 );

        const first = pluginData[ 0 ];

        expect( first.name ).toEqual( pkg.name );
    } );

it( 'ignores a package that is not a plugin', async () => {

        vol.mkdirpSync( localPluginDir ); // local
        vol.writeFileSync( localPluginPackageFile, JSON.stringify( pkg ) ); // local

        const pkg2 = { ... pkg }; // copy properties
        pkg2.name += '-non-plugin';
        pkg2[ PLUGIN_PROPERTY ] = undefined; // removes the expected property

        vol.mkdirpSync( join( localModulesDir, pkg2.name ) );
        vol.writeFileSync( join( localModulesDir, pkg2.name, PKG_FILENAME ), JSON.stringify( pkg2 ) );

        const finder: PackageBasedPluginFinder = new PackageBasedPluginFinder( currentDir, fs );
        const pluginData: PluginData[] = await finder.find();
        expect( pluginData ).toHaveLength( 1 );
    } );

afterEach(function() {
    vol.reset();
    // expect(nock.isDone()).toBe(true);
  });

afterEach( () => {
        vol.reset(); // erase in-memory structure
    } );