[babel-runtime] await is a reserved word failure on asyncGenerator.js

[rosskevin]

Bug

Webpack compilation now fails. It appears that asyncGenerator.js names a function await and that is now a failure with the most recent babel release. This appears to be generated from a babel-helpers template.

/node_modules/babel-runtime/helpers/asyncGenerator.js
Module build failed: SyntaxError: await is a reserved word (122:20)

  120 |       };
  121 |     },
> 122 |     await: function await(value) {
      |                     ^
  123 |       return new AwaitValue(value);
  124 |     }
  125 |   };

yarn list babel-runtime babel-helpers                                                                                                                                                                                    yarn list v0.24.6
├─ babel-helpers@6.24.1
├─ babel-runtime@6.23.0
└─ es-collections@0.0.2
   └─ babel-runtime@5.8.38

Input Code

Not applicable, failing on babel-runtime itself.

Babel Configuration (.babelrc, package.json, cli command)

{
  "presets": [
    [
      "env",
      {
        "targets": {
          "browsers": "> 5%"
        },
        "modules": false,
        "debug": true
      }
    ],
    "stage-2",
    "react"
  ],
  "plugins": [
    "react-hot-loader/babel",
    ["relay", {"compat": true, "schema": "./schema.json"}],
    "transform-flow-strip-types",
    ["lodash", { "id": ["lodash", "recompose"] }]
  ],
  "env": {
    "development": {
      "sourceMaps": "inline"
    }
  }
}

Expected Behavior

Doesn't fail on babel-runtime

Current Behavior

Webpack compile fails as indicated above

Your Environment

software	version(s)
Babel-core	6.25.0
node	8.1.2
yarn	0.24.6
Operating System	OSX

[babel-bot]

Hey @rosskevin! We really appreciate you taking the time to report an issue. The collaborators
on this project attempt to help as many people as possible, but we're a limited number of volunteers,
so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack
community that typically always has someone willing to help. You can sign-up here
for an invite.

[rosskevin]

From slack:

hzoo
[1:17 PM]
#4952? I thought that was what #4954 was doing by @kovensky (edited)

[1:19]
I guess we didn't release a new version of babel-runtime on 6.x https://unpkg.com/babel-runtime@7.0.0-alpha.12/helpers/asyncGenerator.js

[athanasiosem]

I have the same bug.

When I try to npm run build i get
SyntaxError: node_modules/babel-runtime/helpers/asyncGenerator.js: await is a reserved word (122:20).

Babel Configuration (.babelrc, package.json, cli command)

{ "name": "tempproj", "version": "1.0.0", "description": "", "main": "app.js", "dependencies": { "babel-preset-env": "^1.5.2", "babel-cli": "^6.24.1" }, "devDependencies": {}, "scripts": { "build": "babel src -d lib" }, "author": "", "license": "ISC" }

Expected Behavior

To transpile directory without errors.

Current Behavior

SyntaxError: node_modules/babel-runtime/helpers/asyncGenerator.js: await is a reserved word (122:20).

Your environment

• babel-core 6.22.1
• node 7.6.0
• npm 4.1.2
• OS Windows 10

[rosskevin]

I'm seeing the same thing on relay master, @hzoo can we get a maintenance release of babel-runtime to solve this?

[EirikBirkeland]

I got this exact error today when running babel index.js ./.
However, when I simply run babel index.js without the ./, the error does not occur.

@rosskevin Out of sheer curiosity, can you share the contents of your npm run build?

[rosskevin]

Now I get this with babili-webpack-plugin.

It is an error that babel-runtime was not released in sync with the other 0.6.25 babel packages. This is really causing a headache for myself and others. Any attention to this matter is greatly appreciated.

[jridgewell]

We just need to add a function id to the template.

await: function awaiter(value) {
}

[jridgewell]

Confirmed this a problem with the latest babel-runtime@6.23.0. I'm not sure how, but our function namer didn't realize await is a reserved name (it should name it _await).

[hzoo]

Ok I'l just release this manually, sorry

[hzoo]

Hope this doesn't break it even more.. https://unpkg.com/babel-runtime@6.25.0/

https://unpkg.com/babel-runtime@6.25.0/helpers/asyncGenerator.js

    await: function _await(value) {

[hzoo]

Should be fixed, let me know

[tkshnwesper]

Happens when async/await is used incorrectly.

[EirikBirkeland]

I have left the office for the day. I will get back to you tomorrow.

[purefan]

@EirikBirkeland how far away is your office? 😮

[EirikBirkeland]

@purefan Betelgeuse