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I tried to create a service inside my module core by using ng g s core/auth --m=core and ng generate service core/auth --m=core both of which didn't work.
It gave me this error: Unknown option:'--m'
Then, I manually created it inside my core module by naming the file as auth.service.ts and wrote this code inside it:
import { Injectable } from '#angular/core'
import { AngularFireAuth } from '#angular/fire/auth'
import * as firebase from 'firebase/app'
#Injectable()
export class AuthService {
constructor(public afAuth: AngularFireAuth){}
login() {
this.afAuth.auth.signInWithPopup(new firebase.auth.GoogleAuthProvider())
}
logout() {
this.afAuth.auth.signOut()
}
}
But now, my navigation bar component is not working, and my entire angular app is not loading. I have searched a lot but nothing could be of help. Please guide me.
Perform the following steps:
cd to the path of the module where you want to create the service.
Type in : ng generate service auth
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This post was edited and submitted for review 14 hours ago.
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Sorry that I am very new to coding and programming. A lot of stuffs I still don't understand.
I'm having a React code with all the frontends and I wanted to import a module from an auto-generated js file that module.exports an async function. I need the file to perform some calculations and return some values.
However, I keep getting error like this:
Uncaught SyntaxError: The requested module '/#fs/home/zk/solidity/safehome/circuits/main_js/witness_calculator.js' does not provide an export named 'default'
How do I solve this?
Even if I changed the code using { instance } in import still comes up with the same error, just that in this time it says import named "instance" is not found. If I change module.exports in the auto-generated js file to export default, I will have another errors.
code is something like this in js file contains the class:
import builder from "../../../circuits/main_js/witness_calculator.js";
and this is the exports from another js file:
module.exports = async function builder(code, options) {...}
How to reproduce the error:
Clone the below link, checkout "zkedit" branch, cd into "client" folder and npm run dev.
https://github.com/honghan87/safehome
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When I tried to run test cases I am getting the following error:
TypeError: Cannot set property 'fillStyle' of null
for line: import Lottie from 'react-lottie';
Can someone please help how to mock this library?
I have also added 'jest-canvas-mock' library and added the below configuration in the jest.config.ts:
import type { Config } from '#jest/types';
// Sync object
const config: Config.InitialOptions = {
verbose: true,
setupFiles: ['jest-canvas-mock']
};
export default config;
Versions of the packages used:
react: 17.0.2
react-testing-library: 11.2.7
react-lottie: 1.2.3
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Closed 1 year ago.
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I have the following project structure:
/app
/components
/TextInputs
SearchInput.js
TextInput.js
/Buttons
Button.js
CircleButton.js
/screens
...
/utils
...
/services
...
/theme
theme.js
I have seen people using index.js files for importing/exporting stuff, in order to clean all imports of the app.
Is this the main purpose of index.js? Is it a good practice to have a index.js per directory?
If you need to import multiple files from a folder like:
import {SearchInput} from './components/TextInputs/SearchInput'
import {TextInput} from './components/TextInputs/TextInput'
I would recommend creating an index file. This reduces the amount of import statements you are going to use in other components:
/app
/components
/TextInputs
SearchInput.js
TextInput.js
index.js
with the content: (/TextInputs/index.js)
import {SearchInput} from './SearchInput'
import {TextInput} from './TextInput'
export {SearchInput, TextInput}
and use it on the other components like:
import {TextInput, SearchInput} from './components/TextInputs'
This is why the index.js is used mostly, and makes the imports more managable and readable for some cases. Entirely up to developer!
It's likely more personal preference than not, but I think indexes has 2 main benefits.
It lets your user know that this file is the key and main file for that directory, like if I see an index.scss in /style I immediately assume that index will #import other partials. If I see an index.js in a root dir I immediately assume it's probably what package.json is referring to. So in a sense it's communicating things to you.
Most typescript/react project will allow importing with index without having to specify the index file and it will automatically load it for you.
// ./src/example/index.js
import Example from './src/example'
...
// ./theme/index.scss
import './theme'
Which will automatically import the index.
This also helps a lot when you're using something like css modules or styles per component where it's stored in the same directory, so that you can still import the normal component without having to do something like import Header from './Header/header.js'.
There is a caveat though, while it serves some benefits it can also be difficult to debug sometimes when you have 20 files called index, when one of them breaks and the debugger is only telling you it's in a file called "index.js" without being more specific about which file or what directory.
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I am coding react-native.
I have also used the Appregistry.
No errors in code.
Then I ran the / react-native run-android / and it got the error. (I had run react-native start)
Can anyone know what is happening ?
Here's the error
index.js File
App.js File
Package.json File
I would suggest you look into your components. It is most likely that you are not exporting or importing them correctly. If you use export default you have to import the file as import X from 'X'. When using just export your import should look like import { X } from 'X'
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I know it's not crucial to being a good coder, but I am curious if someone knows and could explain what is going on in .js.map files.
For example for this simple .ts file,
import {bootstrap} from 'angular2/platform/browser';
import {enableProdMode} from 'angular2/core';
import {AppComponent} from './app.component';
import {HTTP_PROVIDERS} from 'angular2/http';
import {JSONP_PROVIDERS} from 'angular2/http';
enableProdMode();
bootstrap(AppComponent, [HTTP_PROVIDERS, JSONP_PROVIDERS]);
after compiling to js I get this .js.map file
{"version":3,"file":"main.js","sourceRoot":"","sources":["main.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;YAMA,qBAAc,EAAE,CAAC;YACjB,mBAAS,CAAC,4BAAY,EAAE,CAAC,qBAAc,EAAE,sBAAe,CAAC,CAAC,CAAC"}
Why?
Why
These are sourcemap files. They allow you to debug the original code before it gets transpiled.
Resources
Checkout the sourcemap visualizer : https://sokra.github.io/source-map-visualization/
And more details on sourcemaps : http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/