Webpack babel 6 ES6 decorators
Solution 1
This Babel plugin worked for me:
https://github.com/loganfsmyth/babel-plugin-transform-decorators-legacy
npm i --save-dev babel-plugin-transform-decorators-legacy
.babelrc
{
"presets": ["es2015", "stage-0", "react"],
"plugins": [
["transform-decorators-legacy"],
// ...
]
}
or
Webpack
{
test: /\.jsx?$/,
loader: 'babel',
query: {
cacheDirectory: true,
plugins: ['transform-decorators-legacy' ],
presets: ['es2015', 'stage-0', 'react']
}
}
React Native
With react-native
you must use the babel-preset-react-native-stage-0
plugin instead.
npm i --save babel-preset-react-native-stage-0
.babelrc
{
"presets": ["react-native-stage-0/decorator-support"]
}
Please see this question and answer for a complete explanation.
Solution 2
After spending 5 minutes on the babeljs slack webchat, I found out that decorators are broken in the current version of babel (v6.2). The only solution seems to be to downgrade to 5.8 at this time.
It would also seem they moved their issue tracker from github to https://phabricator.babeljs.io
I write all this down, since after hours of searching I have found the current documentation very poor and lacking.
Solution 3
Installing only babel-plugin-transform-decorators-legacy
didn't work for me (I have a configuration using enzyme along with karma). Turns out installing transform-class-properties
: transform-class-properties and also making sure that the legacy plugin is before the transform class plugin as per the docs in transform-decorators-legacy finally made it work for me.
I'm also not using a .babelrc
file, but adding this to my karma.conf.js
file worked for me:
babelPreprocessor: {
options: {
presets: ['airbnb', 'es2015', 'stage-0', 'react'],
plugins: ["transform-decorators-legacy", "transform-class-properties"]
}
}
I also added it to my loaders:
loaders: [
{
test: /\.js$/,
loader: 'babel',
exclude: path.resolve(__dirname, 'node_modules'),
query: {
presets: ['airbnb', 'es2015', 'stage-0', 'react'],
plugins: ["transform-decorators-legacy", "transform-class-properties"]
}
},
Solution 4
You just need a transform decorators plugin: http://babeljs.io/docs/plugins/transform-decorators/
Solution 5
If you upgraded your project from Babel 6 to Babel 7, then you want to install @babel/plugin-proposal-decorators
.
If you want to support legacy decorators as used in Babel 5, you need to configure your .babelrc
as follows:
plugins: [
['@babel/plugin-proposal-decorators', { legacy: true }],
['@babel/plugin-proposal-class-properties', { loose: true }],
]
Ensure @babel/plugin-proposal-decorators
comes before @babel/plugin-proposal-class-properties
in the case that you are making use of the latter.
Related videos on Youtube
Comments
-
Pavlin almost 4 years
I've got a project written in ES6 with webpack as my bundler. Most of the transpiling works fine, but when I try to include decorators anywhere, I get this error:
Decorators are not supported yet in 6.x pending proposal update.
I've looked over the babel issue tracker, and haven't been able to find anything on it there, so I'm assuming I'm using it wrong. My webpack config (the relevant bits):
loaders: [ { loader: 'babel', exclude: /node_modules/, include: path.join(__dirname, 'src'), test: /\.jsx?$/, query: { plugins: ['transform-runtime'], presets: ['es2015', 'stage-0', 'react'] } } ]
I have no trouble with anything else, arrow functions, destructuring all work fine, this is the only thing that doesn't work.
I know I could always downgrade to babel 5.8 where I had it working a while ago, but if there's any way to get this working in the current version (v6.2.0), it would help.
-
Pavlin over 8 yearsI thought since I included the stage-0 preset, that they would get transformed propery. Decorators are part of the stage-1 preset that should include the transform-decorators. As written on the babel website.
-
Sulthan over 8 years@Pavlin I am thinking whether this could be an issue with the ordering of
presets
. -
Pavlin over 8 yearsI thought it may be that, but I tested it again. Any way I put it I get an error. Apparently the order does matter, but I don't think that's the problem here.
-
-
Jason over 8 yearsFrom that issue, a "best-effort with limitations" legacy plugin was made. See readme for limitations: npmjs.com/package/babel-plugin-transform-decorators-legacy
-
dvlsg over 8 yearsI can confirm that the transform decorators legacy is working for me as an interim solution.
-
amcdnl over 8 yearsStill failed for me w/ that.
-
loganfsmyth over 8 yearsYou probably wouldn't want the plugin enabled only for
development
. -
Kyle Finley over 8 yearsThanks @loganfsmyth. I've update the answer to include
production
as well -
loganfsmyth over 8 yearsI mean, why put it in an
env
block at all? You can haveplugins
as a sibling ofpresets
-
Kyle Finley over 8 years@loganfsmyth, ah, I didn't know that. Updated, thanks.
-
Qiming over 8 years@amcdnl my impression is that the transform decorators plugin is the official one but left unimplemented due to TC39 constraints, in the meantime there is this - github.com/loganfsmyth/babel-plugin-transform-decorators-legacy
-
Ajax over 8 years@Pavlin, although your answer may have been correct, the plugin listed below should be the accepted answer for now.
-
amcdnl over 8 years@Qiming yup thats what i ended up using and babel official even says that if u dig far enough .. pretty terrible idea on their part imo
-
Micros over 8 yearsIs it on purpose that the order of presets for Webpack is different from Babelrc? (es2015 first instead of react)
-
Kyle Finley over 8 years@Micros, no the order doesn't matter. I've update the answer to avoid confusion.
-
reectrix almost 8 yearsThe
babel-plugin-transform-decorators-legacy
doesn't work for me. Any updates for 2016? -
Kyle Finley almost 8 years@am5255, it still seems to be working for me. Would you mind submitting an issue with the author? github.com/loganfsmyth/babel-plugin-transform-decorators-legacy/…
-
reectrix almost 8 yearsWas finally able to get this to work. Turns out I had to install
transform-class-properties
as well babeljs.io/docs/plugins/transform-class-properties and also make sure that the legacy plugin is before the transform class plugin as per the docs in github.com/loganfsmyth/babel-plugin-transform-decorators-legacy -
cjmling about 6 yearsSpend an hour here and there and this things worked for me. Thanks alot