使用Nodemon在Node.js v6.2.0上安装Babel V6.x ES7 Async / Await
男人是一个痛苦的设置！ 我已经按照安装说明点击了nodemon框：
https://babeljs.io/docs/setup/#installation
npm install babel-cli babel-preset-es2015 --save-dev .babelrc在根目录下：
{ "presets": ["es2015"], "plugins": ["transform-async-to-generator"] }
package.json （我已经安装了更多的babel的东西，如图所示）：
... "devDependencies": { "babel-cli": "^6.11.4", "babel-core": "^6.13.2", "babel-plugin-transform-async-to-generator": "^6.8.0", "babel-polyfill": "^6.13.0", "babel-preset-es2015": "^6.13.2", "babel-preset-node6": "^11.0.0", "babel-register": "^6.11.6" }, "scripts": { "startn": "nodemon app.js", "babel-node": "babel-node --presets=es2015 --ignore='foo|bar|baz'", "babel-dev": "nodemon --exec npm run babel-node -- experiment/socketio/test.js" }, ...
test.js ：
(async function () { // <-- error occues here const value = await 123; console.log(value); })().then(() => { console.log('Done'); });
我运行命令run-script babel-dev ，如下所示。 错误：
karl@karl-ux303ln:~/dev/sketch$ npm run-script babel-dev > sketch@0.0.1 babel-dev /home/karl/dev/sketch > nodemon --exec npm run babel-node -- experiment/socketio/test.js [nodemon] 1.10.0 [nodemon] to restart at any time, enter `rs` [nodemon] watching: *.* [nodemon] starting `npm run babel-node experiment/socketio/test.js` > sketch@0.0.1 babel-node /home/karl/dev/sketch > babel-node --presets=es2015 --ignore='foo|bar|baz' "experiment/socketio/test.js" /home/karl/dev/sketch/node_modules/babel-core/lib/transformation/file/index.js:591 throw err; ^ SyntaxError: /home/karl/dev/sketch/experiment/socketio/test.js: Unexpected token (1:7) > 1 | (async function () { | ^ 2 | const value = await 123; 3 | console.log(value); 4 | })().then(() => { at Parser.pp.raise (/home/karl/dev/sketch/node_modules/babylon/lib/parser/location.js:22:13) at Parser.pp.unexpected (/home/karl/dev/sketch/node_modules/babylon/lib/parser/util.js:89:8) at Parser.pp.expect (/home/karl/dev/sketch/node_modules/babylon/lib/parser/util.js:83:33) at Parser.pp.parseParenAndDistinguishExpression (/home/karl/dev/sketch/node_modules/babylon/lib/parser/expression.js:582:12) at Parser.pp.parseExprAtom (/home/karl/dev/sketch/node_modules/babylon/lib/parser/expression.js:481:19) at Parser.pp.parseExprSubscripts (/home/karl/dev/sketch/node_modules/babylon/lib/parser/expression.js:277:19) at Parser.pp.parseMaybeUnary (/home/karl/dev/sketch/node_modules/babylon/lib/parser/expression.js:257:19) at Parser.pp.parseExprOps (/home/karl/dev/sketch/node_modules/babylon/lib/parser/expression.js:188:19) at Parser.pp.parseMaybeConditional (/home/karl/dev/sketch/node_modules/babylon/lib/parser/expression.js:165:19) at Parser.pp.parseMaybeAssign (/home/karl/dev/sketch/node_modules/babylon/lib/parser/expression.js:128:19) npm ERR! Linux 3.19.0-65-generic npm ERR! argv "/home/karl/.nvm/versions/node/v6.2.0/bin/node" "/home/karl/.nvm/versions/node/v6.2.0/bin/npm" "run" "babel-node" "experiment/socketio/test.js" npm ERR! node v6.2.0 npm ERR! npm v3.8.9 npm ERR! code ELIFECYCLE npm ERR! sketch@0.0.1 babel-node: `babel-node --presets=es2015 --ignore='foo|bar|baz' "experiment/socketio/test.js"` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the sketch@0.0.1 babel-node script 'babel-node --presets=es2015 --ignore='foo|bar|baz' "experiment/socketio/test.js"'. npm ERR! Make sure you have the latest version of node.js and npm installed. npm ERR! If you do, this is most likely a problem with the sketch package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! babel-node --presets=es2015 --ignore='foo|bar|baz' "experiment/socketio/test.js" npm ERR! You can get information on how to open an issue for this project with: npm ERR! npm bugs sketch npm ERR! Or if that isn't available, you can get their info via: npm ERR! npm owner ls sketch npm ERR! There is likely additional logging output above. npm ERR! Please include the following file with any support request: npm ERR! /home/karl/dev/sketch/npm-debug.log [nodemon] app crashed - waiting for file changes before starting...
我也尝试切换到节点v4.4.7并将npm升级到3.10.6。 还是一样的错误。
1）删除所有的babel模块（删除所有东西 ，这是我find的一个小错误）
2）安装以下内容：
npm install --save-dev babel-polyfill babel-preset-es2015 babel-preset-stage-3 babel-register
3）修复.babelrc文件：
{ "presets": [ "es2015", "stage-3" ] }
4）检查它是否工作（ -r标志是预加载模块）：
node -r babel-register -r babel-polyfill experiment/socketio/test.js
要修复nodemon：
nodemon -r babel-register -r babel-polyfill experiment/socketio/test.js
asynchronous/等待在babeljs中由插件transform-async-to-generator ，它包含在stage-3预置中。 默认情况下，它并不包含在es2015预设中，因此您必须明确添加插件本身或stage-3预设。 要在命令行上执行该操作，请在package.json更改以下行：
"babel-node": "babel-node --presets=es2015 --ignore='foo|bar|baz'",
读书：
"babel-node": "babel-node --presets=es2015,stage-3 --ignore='foo|bar|baz'",
添加stage-3预设。 同样也可以这样实现：
"babel-node": "babel-node --presets=es2015 --plugins=transform-async-to-generator --ignore='foo|bar|baz'",
但是，通常build议使用.babelrcconfiguration文件，这可能很简单：
{ "presets": ["es2015", "stage-3"] }
要么
{ "presets": ["es2015"], "plugins": ["transform-async-to-generator"] }
然后package.json的行可以是：
"babel-node": "babel-node --ignore='foo|bar|baz'",
（评论上下文的原始答案）
你需要添加：
"plugins": ["transform-async-to-generator"]
到你的.babelrc ，因为我不相信async / await包含在任何标准的预设中（因为它可以用多种方式实现）