Skip to main content

How do I approach solving this problem: Cannot access 'calculationEntry' before initialization?

I'm developing a large CRA single page app. It has been running fine for months, with the normal bugs that are normally fixable. A couple of weeks ago it failed by just hanging in the splash page with a spinning circle. No code was hit so no breakpoints worked. I did a lot of experimentation with the importing and exporting of all the files, thinking that was the root cause. Finally I thought to do a build and run that. That did get past the splash screen and generate an exception. The first was fixed, but now I get this Cannot access 'calculationEntry' before initialization error. I'm using VSCode and the launch.json configuration is:

  "name": "Chrome React",
  "type": "chrome",
  "request": "launch",
  "sourceMaps": true,
  "url": "http://localhost:3000",
  "webRoot": "${workspaceRoot}/src",
  "userDataDir": "${workspaceRoot}/.chrome",
  "sourceMapPathOverrides": {
    "webpack:///src/*": "${webRoot}/*"
  },
  "breakOnLoad": true

I can't show example code, the whole project compiles without error. The error occurs when I run with f5. This is what I get. The name 'calculationEntry' is a function, and I think that a function is initialized when declared. So why this error?

        "use strict";
    __webpack_require__.r(__webpack_exports__);
    /* WEBPACK VAR INJECTION */(function(__react_refresh_utils__, __react_refresh_error_overlay__) {/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "calculationEntry", function() { return calculationEntry; });
                                                                                ^
    Exception has occurred: ReferenceError: Cannot access 'calculationEntry' before initialization
      at Module.calculationEntry (http://localhost:3000/static/js/main.chunk.js:5896:204)
        at Module.calculationEntry (http://localhost:3000/static/js/main.chunk.js:53960:169)
        at Object.registerExportsForReactRefresh (http://localhost:3000/static/js/vendors~main.chunk.js:995:38)
        at Module.<anonymous> (http://localhost:3000/static/js/main.chunk.js:54703:25)
        at Module../src/moduleNameSpace.js (http://localhost:3000/static/js/main.chunk.js:54775:30)
        at __webpack_require__ (http://localhost:3000/static/js/bundle.js:852:31)
        at fn (http://localhost:3000/static/js/bundle.js:151:20)
        at Module.<anonymous> (http://localhost:3000/static/js/main.chunk.js:5897:74)
        at Module../src/calculations/moduleCalc0.js (http://localhost:3000/static/js/main.chunk.js:6104:30)
        at __webpack_require__ (http://localhost:3000/static/js/bundle.js:852:31)
        at fn (http://localhost:3000/static/js/bundle.js:151:20)
        at Module.<anonymous> (http://localhost:3000/static/js/main.chunk.js:37915:84)
        at Module../src/components/Forecaster/index.js (http://localhost:3000/static/js/main.chunk.js:38243:30)
        at __webpack_require__ (http://localhost:3000/static/js/bundle.js:852:31)
        at fn (http://localhost:3000/static/js/bundle.js:151:20)
        at Module.<anonymous> (http://localhost:3000/static/js/main.chunk.js:47062:82)
        at Module../src/components/Root/Root.dev.js (http://localhost:3000/static/js/main.chunk.js:47396:30)
        at __webpack_require__ (http://localhost:3000/static/js/bundle.js:852:31)
        at fn (http://localhost:3000/static/js/bundle.js:151:20)
        at Object.<anonymous> (http://localhost:3000/static/js/main.chunk.js:47779:20)
        at Object../src/components/Root/index.js (http://localhost:3000/static/js/main.chunk.js:47855:30)
        at __webpack_require__ (http://localhost:3000/static/js/bundle.js:852:31)
        at fn (http://localhost:3000/static/js/bundle.js:151:20)
        at Module.<anonymous> (http://localhost:3000/static/js/main.chunk.js:51422:74)
        at Module../src/index.js (http://localhost:3000/static/js/main.chunk.js:51577:30)
        at __webpack_require__ (http://localhost:3000/static/js/bundle.js:852:31)
        at fn (http://localhost:3000/static/js/bundle.js:151:20)
        at Object.1 (http://localhost:3000/static/js/main.chunk.js:57861:18)
        at __webpack_require__ (http://localhost:3000/static/js/bundle.js:852:31)
        at checkDeferredModules (http://localhost:3000/static/js/bundle.js:46:23)
        at Array.webpackJsonpCallback [as push] (http://localhost:3000/static/js/bundle.js:33:19)
        at http://localhost:3000/static/js/main.chunk.js:1:79

I have a module doing all the imports and re-exporting all the named exports that I made to try preventing cyclic references, and I moved the location of the import of the module with the calculationEntry function, to see if it made a difference. It did not. So I need some help in how to use this debug dump to track down this TDZ exceptions problem.

Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
Labels:

Comments

Post a Comment

Popular posts from this blog

Confusion between commands.Bot and discord.Client | Which one should I use?

Whenever you look at YouTube tutorials or code from this website there is a real variation. Some developers use client = discord.Client(intents=intents) while the others use bot = commands.Bot(command_prefix="something", intents=intents) . Now I know slightly about the difference but I get errors from different places from my code when I use either of them and its confusing. Especially since there has a few changes over the years in discord.py it is hard to find the real difference. I tried sticking to discord.Client then I found that there are more features in commands.Bot . Then I found errors when using commands.Bot . An example of this is: When I try to use commands.Bot client = commands.Bot(command_prefix=">",intents=intents) async def load(): for filename in os.listdir("./Cogs"): if filename.endswith(".py"): client.load_extension(f"Cogs.{filename[:-3]}") The above doesnt giveany response from my Cogs ...
Post a Comment
Read more

How to show number of registered users in Laravel based on usertype?

i'm trying to display data from the database in the admin dashboard i used this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count(); echo $users; ?> and i have successfully get the correct data from the database but what if i want to display a specific data for example in this user table there is "usertype" that specify if the user is normal user or admin i want to user the same code above but to display a specific usertype i tried this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count()->WHERE usertype =admin; echo $users; ?> but it didn't work, what am i doing wrong? source https://stackoverflow.com/questions/68199726/how-to-show-number-of-registered-users-in-laravel-based-on-usertype
Post a Comment
Read more

Where and how is this Laravel kernel constructor called? [closed]

Where and how is this Laravel kernel constructor called? public fucntion __construct(Application $app, $Router $roouter) { } I have read the documentation and some online tutorial but I can find any clear explanation. I am learning Laravel and I am wondering where does this kernel constructor receives its arguments from. "POSTMOTERM" CLARIFICATION: Here is more clarity.I have checked the boostrap/app.php and it is only used for boostrapping the interfaces into the container class. What is not clear to me is where and how the Kernel class is instatiated and the arguments passed to the object calling the constructor.Something similar to; obj = new kernel(arg1,arg2) or, is the framework using some magic functions somewhere? Special gratitude to those who burn their eyeballs and brain cells on this trivia before it goes into a full blown menopause alias "MARKED AS DUPLICATE". To some of the itchy-finger keyboard warriors, a.k.a The mods,because I believe in th...
Post a Comment
Read more