82 lines
2.8 KiB
Markdown
82 lines
2.8 KiB
Markdown
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# Solution for Angular NgClass Import Error
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## Issue Description
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When running `npm start` in the airwatch directory, the following error occurred:
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```
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✘ [ERROR] NG3004: Unable to import symbol NgClass.
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The symbol is not exported from /home/poule/encrypted/stockage-syncable/www/development/html/ng-implementation/airwatch/node_modules/@angular/common/index.d.ts (module '@angular/common'). [plugin angular-compiler]
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../my-workspace/projects/sae-lib/buttons/main-button/main-button.ngtypecheck.ts:0:0:
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0 │
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╵ ^
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The symbol is declared here.
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../my-workspace/projects/sae-lib/node_modules/@angular/common/common_module.d.d.ts:351:0:
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351 │ declare class NgClass implements DoCheck {
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╵ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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```
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## Root Cause
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The error occurred because:
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1. The `main-button` component in the `sae-lib` project was importing `NgClass` directly from `@angular/common`.
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2. In Angular 20+ (the project is using Angular 20.1.0), `NgClass` is no longer exported directly from `@angular/common` but is available from `@angular/common/directives`.
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3. Additionally, the `link-sae-lib.sh` script was incorrectly linking `sae-lib` to `old-sae-airwatch` instead of the `airwatch` project.
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## Changes Made
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1. Updated the import statement in `/my-workspace/projects/sae-lib/buttons/main-button/main-button.ts`:
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```typescript
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// Changed from:
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import {NgClass} from '@angular/common';
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// To:
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import {NgClass} from '@angular/common/directives';
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```
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2. Fixed the `link-sae-lib.sh` script to link `sae-lib` to the `airwatch` project instead of `old-sae-airwatch`:
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```bash
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# Changed from:
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cd ../../../old-sae-airwatch
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echo "Utilisation du lien dans l'application old-sae-airwatch..."
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# To:
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cd ../../../airwatch
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echo "Utilisation du lien dans l'application airwatch..."
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```
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## Additional Requirements
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When attempting to verify the fix, a Node.js version compatibility issue was discovered:
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```
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Node.js version v20.18.1 detected.
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The Angular CLI requires a minimum Node.js version of v20.19 or v22.12.
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```
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To fully run the application, you'll need to update Node.js to version v20.19+ or v22.12+.
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## How to Update Node.js
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You can update Node.js using one of the following methods:
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### Using NVM (Node Version Manager)
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```bash
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# Install NVM if not already installed
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curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash
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# Install and use the required Node.js version
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nvm install 20.19
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nvm use 20.19
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```
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### Using the Official Node.js Installer
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1. Visit https://nodejs.org/
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2. Download and install version 20.19 or higher
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After updating Node.js, run `npm start` in the airwatch directory to verify that both the NgClass import issue and the Node.js version issue are resolved.
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