How to use the fixturify.writeSync function in fixturify

export function writeFile(
  path: string,
  data: Buffer | string,
  encoding?: string
): void {
  // ensure path exists
  writeSync(pathmod.dirname(path), {});
  if (encoding === undefined) {
    writeFileSync(path, data);
  } else {
    writeFileSync(path, data, encoding);
  }
}

execution.addListener( "message", function( data ) {
			assert.step( data );

			if ( data === "runEnd" ) {
				count++;

				if ( count === 1 ) {
					fixturify.writeSync( fixturePath, {
						"tests": {
							"foo.js": `
								process.send(require('../bar.js'));
								QUnit.module('Module');
								QUnit.test('Test', function(assert) {
									assert.ok(true);
								});`
						},
						"bar.js": "module.exports = 'bar export first';"
					} );
				}

				if ( count === 2 ) {
					fixturify.writeSync( fixturePath, {
						"bar.js": "module.exports = 'bar export second';"
					} );

test.serial.cb('detect file addition', t => {
  fixturify.writeSync('.', {
    'brunch-config.js': `module.exports = {
      files: {
        javascripts: {
          joinTo: 'app.js'
        }
      }
    };`,
    app: {
      assets: {
        'index.html': '<h1>hello world</h1>',
      },
      'initialize.js': 'console.log("hello world")',
    },
  });

  watch({}, function* (compilation) {

test.serial.cb('customize paths.public config', t => {
  fixturify.writeSync('.', {
    'brunch-config.js': `module.exports = {
      files: {
        javascripts: {
          joinTo: 'app.js'
        }
      },
      paths: {
        public: 'dist'
      }
    };`,
    app: {
      assets: {
        'index.html': '<h1>hello world</h1>',
      },
      'initialize.js': 'console.log("hello world")',
    },

export function writeTree(path: string, tree: Tree): void {
  writeSync(path, tree);
}

FixtureTree.prototype.write = function (readTree, destDir) {
  fixturify.writeSync(destDir, this.fixtureObject)
}

test.serial.cb('reuse javascripts.joinTo for templates.joinTo', t => {
  const files = {
    'brunch-config.js': `module.exports = {
      files: {
        javascripts: {
          joinTo: 'all.js'
        }
      }
    };`,
    app: {
      'a.emp': 'hello-world',
      'b.emp': 'module-exports',
    },
  };

  fixturify.writeSync('.', Object.assign(files, TempCompiler));

  brunch.build({}, () => {
    fileContains(t, 'public/all.js', 'hello^world');
    fileContains(t, 'public/all.js', 'module^exports');
    t.end();
  });
});

writeFixture(fixture) {
    fixturify.writeSync(this.path, fixture);
  }