I recently started learning Angular and ran into a problem while working on my index.component.ts file.
There seems to be an error: Uncaught ReferenceError: __importDefault is not defined
I recently started learning Angular and ran into a problem while working on my index.component.ts file.
There seems to be an error: Uncaught ReferenceError: __importDefault is not defined
Encountered an issue during the upgrade from version 8 to 9 of Angular. Initially thought it was a bug and started reporting it on https://github.com/angular/angular/issues/35208. However, upon further investigation, it appears that it may not actually be a bug but rather a result of a missed step during the upgrade process.
In brief:
It seems that Due to updating Angular CLI without performing the necessary migrations (due to specific constraints), my package.json contained outdated dependencies as shown below:
"devDependencies": {
"@angular-devkit/build-angular": "^0.803.20",
"@angular-devkit/build-ng-packagr": "~0.803.20",
....
The issue was resolved after updating these versions to the following To prevent this issue, ensure the versions are up-to-date as follows:
"devDependencies": {
"@angular-devkit/build-angular": "~0.900.1",
"@angular-devkit/build-ng-packagr": "~0.900.1",
....
Note that I have provided the incorrect/correct package versions for reference purposes only. It is recommended to follow the proper procedures outlined in the ticket to update them correctly rather than manually making changes.
During my upgrade from angular 6 to angular 8, I encountered this issue related to TypeScript. Unfortunately, I was unable to downgrade my TypeScript version, so I had to find a workaround by overriding a method. Adding the code snippet below to my index.html file resolved the problem for me.
Check out the GitHub Issue for more information.
<script> var __importDefault = (this && this.__importDefault) || function (mod) { return (mod && mod.__esModule) ? mod : { "default": mod }; }</script>
It worked like a charm for me.
I made the following additions to polyfills.ts:
const x: any = window
// Resolved "missing __importDefault" issue by referring to https://github.com/angular/angular/issues/32215#issuecomment-543459862
x.__importDefault = (x && x.__importDefault) || function (module) { return (module && module.__esModule) ? module : { "default": module }; }
Encountered a similar issue during the migration of my project from Angular 7 to 8.
Upon executing ng serve, I received the following error:
ERROR in The Angular Compiler requires TypeScript >=3.4.0 and <3.6.0 but 3.6.2 was found instead.
Subsequently:
"Uncaught ReferenceError: __importDefault is not defined.
Resolved the problem by running npm install typescript@~3.4.0.
Insert the code snippet below into your index.html file within the head section
<script>
var __importDefault = (this && this.__importDefault) || function (mod) { return (mod && mod.__esModule) ? mod : { "default": mod }; }
</script>
The issue at hand is caused by an outdated version of TypeScript. You will need to revert back to a previous version.
Error: Uncaught ReferenceError: __importDefault is not defined
To resolve this, navigate to your package.json file and change the TypeScript version to 3.5.3:
"devDependencies": {
// ...
"typescript": "3.5.3"
}
If you want to update your Index.html, simply insert the following script tag into the head section:
(Tag-Open)script(Tag-Close) var __importDefault = (this && this.__importDefault) || function (mod) { return (mod && mod.__esModule) ? mod : { "default": mod }; }(Tag-Open)script(Tag-Close)
I tried this and it worked perfectly for me!
The problem I encountered was related to Angular 8: __importDefault is not defined
To solve it, I decided to downgrade the version of TypeScript from 3.5.3 to 3.4.5
Sometimes, adding more code to ignore a problem doesn't actually solve the underlying issue. This was the case for me after updating Angular with the --force command, which resulted in the same problem persisting.
Using npm update revealed warning errors in my case:
npm WARN @angular-devkit/[email protected] requires a peer of @angular/compiler-cli@^8.0.0 but none is installed. You must install peer dependencies yourself.
Similarly, other packages also required specific versions of dependencies to be installed.
To resolve the issue, I updated the necessary packages using CLI commands in the terminal:
ng update @angular-devkit/build-angular
ng update @ngtools
ng update codelyzer
ng update jasmine-core
By addressing the outdated packages directly, I was able to fix the problem. It's important to avoid blindly copying and pasting code and instead troubleshoot the root cause of issues. Every problem is unique and may require a different solution.
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