请问怎么把代码弄成index.bundle.js，yarn watch时报这个错

[lizhouxx]

请问怎么把代码弄成index.bundle.js

yarn watch时报这个错：
`
D:\ws_now\markdown-plus>yarn watch
yarn run v1.9.4
$ yarn build -- --watch
warning From Yarn 1.0 onwards, scripts don't require "--" for options to be forwarded. In a future version, any explicit "--" will be forwarded as-is to the scripts.
$ node -r babel-register node_modules/.bin/webpack --progress --colors --watch
D:\ws_now\markdown-plus\node_modules.bin\webpack:2
basedir=$(dirname "$(echo "$0" | sed -e 's,,/,g')")
^^^^^^^

SyntaxError: missing ) after argument list
at new Script (vm.js:73:7)
at createScript (vm.js:245:10)
at Object.runInThisContext (vm.js:297:10)
at Module._compile (internal/modules/cjs/loader.js:657:28)
at Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Object.require.extensions.(anonymous function) [as .js] (D:\ws_now\markdown-plus\node_modules\babel-register\lib\node.js:152:7)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

D:\ws_now\markdown-plus>yarn run test -o --watch
yarn run v1.9.4
error Command "test" not found.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
`