'javascript_pack_tag' location

km-tr commented 7 years ago

Help us help you! Please choose one:

[ ] My app crashes with react-rails, so I've included the stack trace and the exact steps which make it crash.
[ ] My app doesn't crash, but I'm getting unexpected behavior. So, I've described the unexpected behavior and suggested a new behavior.
[ ] I'm trying to use react-rails with another library, but I'm having trouble. I've described my JavaScript management setup (eg, Sprockets, Webpack...), how I'm trying to use this other library, and why it's not working.
[x] I have another issue to discuss.

Writing react_component before javascript_pack_tag when SSR is executed will result in an error.

Invariant Violation: Element type is invalid...

I made it behind javascript_pack_tag, the error no longer exists.

Is this a specification?

rmosolgo commented 7 years ago

Huh, that's a surprise for me!

The error your describing, does it happen in the browser or in the SSR process?

Can you share the full stack trace?

km-tr commented 7 years ago

Encountered error "#<ExecJS::ProgramError: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in.>" when prerendering initalizer with {}
invariant (eval at <anonymous> ((execjs):113:1), <anonymous>:44:15)
instantiateReactComponent (eval at <anonymous> ((execjs):727:1), <anonymous>:74:23)
eval (eval at <anonymous> ((execjs):2098:1), <anonymous>:44:31)
ReactServerRenderingTransaction.TransactionImpl.perform (eval at <anonymous> ((execjs):500:1), <anonymous>:140:20)
renderToStringImpl (eval at <anonymous> ((execjs):2098:1), <anonymous>:43:24)
Object.renderToString (eval at <anonymous> ((execjs):2098:1), <anonymous>:73:10)
Object.ReactRailsUJS.serverRender (eval at <anonymous> ((execjs):1299:1), <anonymous>:70:42)
(execjs):6:45
(execjs):18:13
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km-tr commented 7 years ago

Excuse me. The cause of the error was elsewhere.

If I ceased to use import in the files incomponents, then the error ceased.

// import React from 'react'
↓
var React = require("react")

When trying with a another new application, even if I used import, it worked, It may be due to my .babelrc setting.

{
  "presets": [
    ["env", {
      "modules": false,
      "targets": {
        "browsers": "> 1%",
        "uglify": true
      },
      "useBuiltIns": true
    }],
    "react",
    "stage-1"
  ],

  "plugins": [
["module-alias",
      [
        .....
      ]
    ],
    "syntax-dynamic-import",
    "transform-decorators-legacy",
    "transform-class-properties"
  ]
}

rmosolgo commented 7 years ago

🤔 Wow, so by switching from import to require, this issue was resolved?

How strange! I wonder why!

SebAshton commented 7 years ago

@km-tr I had the same issue, and found the source of the error to be the auto-generated presets in the .babelrc

I went from when you have above to:

...
  "presets": [
    [
      "env",
      {
        "modules": false,
        "targets": {
          "browsers": "> 1%",
          "uglify": true
        },
        "useBuiltIns": true
      }
    ],
    "react",
    "es2015",
    "stage-0"
  ],
...

You'll need to also yarn add babel-preset-stage-0 babel-preset-es2015 --dev

I was then able to use imports etc as normal

km-tr commented 7 years ago

We have already added it to yarn. The cause of this time is in another part because it uses window.

BookOfGreg commented 7 years ago

If you don't mind, I'll mark this as closed unless there is something I can help you with. It sounds like this was solved at the time, thank you :)

reactjs / react-rails

'javascript_pack_tag' location #733