Module Build failed using Webpack4, Babel, React

Question

i keep getting the error:

 Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Duplicate plugin/preset detected.
If you'd like to use two separate instances of a plugin,
they need separate names, e.g.

  plugins: [
    ['some-plugin', {}],
    ['some-plugin', {}, 'some unique name'],
  ]

this is my babelrc with the changes it is asking for:

{
"presets": [
  ["@babel/env"],
  ["@babel/preset-react"]
],
"plugins": [
    ["@babel/plugin-syntax-jsx"],
    ["@babel/plugin-transform-react-jsx"],
    ["@babel/plugin-transform-react-display-name"],
    ["@babel/plugin-transform-react-jsx-self"],
    ["@babel/plugin-transform-react-display-name"]
  ]

}

Not really sure where i have the wrong syntax for the file. Also this is my first time configuring webpack4 with babel for a react application. Please let me know if everything looks fine for this to work with react.

I see "plugin-transform-react-display-name" in your list twice. — SamVK
– SamVK, Commented Sep 2, 2018 at 4:13

SamVK · Accepted Answer · 2018-09-02 04:21:43Z

3

Like the error says: you have a duplicate. ["@babel/plugin-transform-react-display-name"] is in your "plugins" array twice. Just delete one of them.

With that said: take a look at what's already included in preset-react (a preset is a pre-defined bundle of plugins). All of those plugins are already included (though "plugin-transform-react-jsx-self" is behind an option.)

edited Sep 2, 2018 at 4:21

answered Sep 2, 2018 at 4:16

SamVK

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1 Comment

tstreets Over a year ago

ahh ok thank you for that i completely misread it when i was looking up the preset

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