standard aurelia template referencing file outside src directory

standard aurelia template referencing file outside src directory - javascript

I have created a new aurelia project via au new and have no issues referencing typescript files in the src folder. For example in main.ts this works:
main.ts
import { Util } from './util'; //in aurelia-app\src
new Util();
util.ts
export class Util{ }
When I move util.ts up one level, this breaks the au CLI:
import { Util } from '../util'; //in aurelia-app\
Error:
Tracing main... ------- File not found or not accessible ------
| Location: D:/temp/aurelia-test1/aurelia-app/util.js
| Requested by:> D:/temp/aurelia-test1/aurelia-app/src/main.js
| Is this a package?
Make sure that it is configured in aurelia.json and that it is not a
Node.js package
Can someone tell me why the CLI doesn't like this and possibly how to fix it ?
There is a clue insofar as the log states its looking for util.js however this doesnt explain why it does work when util.ts is in the src folder because i do not see util.js in this folder either.
update
As per #Jesse answer below you can modify aurelia.json to fix the problem as stated above - however this fails if you want to go another directory higher. For example
import { Util } from '../../util';

That is because your aurelia.json is configured to transpile all .ts files in the src-folder:
"transpiler": {
"id": "typescript",
"displayName": "TypeScript",
"fileExtension": ".ts",
"dtsSource": [
"./custom_typings/**/*.d.ts"
],
"source": "src/**/*.ts" <--- right here
},
Therefore it won't transpile your typescript file in the root. You can change the transpiler settings in the aurelia.json to overcome this, but I'd recommend keeping your typescript in the src-folder.

Related

Importing leaflet into module from cdn with typescript support

I'm trying to import leaflet into a javascript module with typescript support but can't get it to work.
I've installed #types/leaflet and have tried to following:
import 'https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.8.0/leaflet.js'
This works fine in the browser but typescript gives the following error:
'L' refers to a UMD global, but the current file is a module. Consider adding an import instead.ts(2686)
(I call L.map() in my code)
I've also tried:
import * as L from 'https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.8.0/leaflet.js'
This works fine in typescript, but gives the following error in chrome:
Uncaught TypeError: L.map is not a function
Anyone know how to fix this?
I don't want to use a bundler.
Edit
As jsejcksn suggested in the comments, importing a ES module version of leaflet and adding a path alias to typescript fixed this.
I'm now using the following import:
import * as L from 'https://unpkg.com/leaflet#1.8.0/dist/leaflet-src.esm.js'
The problem with this though, as stated on Leaflet's Download page, is that this imports Leaflet's source files including unit tests, files for debugging, build scripts, etc. This doesn't seem very efficient to me.
Any other ideas?
Edit 2
It seems like Leaflet 1.9 will solve my problem when it will be released. This pull request adds an ES module entrypoint to Leaflet meaning you can do this:
import L from 'leaflet'
or in our case:
import L from 'cdn.com/link/to/leaflet/1.9/esm'
In the mean time, jsejcksn's answer provides a good alternative so I will accept that answer.

Preface
I've already written an answer about how to do this with ES modules at the question How to include modules in client side in typescript projects?. Be sure to read through that question and answer for context here.
You said:
I don't want to use a bundler.
and also:
The problem with this though, as stated on Leaflet's Download page, is that this imports Leaflet's source files including unit tests, files for debugging, build scripts, etc. This doesn't seem very efficient to me.
These ideas seem at odds to me. Without more information, I can only assume that by "not very efficient" you mean that the byte size of the presumably not-tree-shaken ES module is larger than the UMD module. If that's the case, why not just import Leaflet into your bundle and tree-shake away all of the parts that you don't use during build, resulting in even fewer bytes than the UMD?
Ignoring that for now, and responding purely to your stated criteria, below I will provide a self-contained, reproducible example demonstrating how you can use a CDN-hosted UMD module that has a corresponding #types package in a TypeScript ES module without augmenting the definition of globalThis.window in the compiler and without bundling.
Note that some of what I show will be purely ceremonial, but the technique will allow for you to later swap out the shim module URL in the import map with a CDN ES module URL if/when you find one that suits you.
Download the files in this example
I'm going to provide a complete reproducible example here, including all the content of each file in a code block. If you want to use this example to reproduce it and don't want to copy + paste every individual code block into a new file with a matching name on your device, then you can copy + paste the following script and run it in your browser console to download the repo as a zip archive file:
function download (data, fileName, mediaType) {
const a = document.createElement('a');
const blob = new Blob([data], mediaType ? {type: mediaType} : undefined);
const url = URL.createObjectURL(blob);
a.href = url;
a.download = fileName;
a.click();
a.remove();
// URL.revokeObjectURL(url);
}
download(
new 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"so-73091042.zip",
"application/zip",
);
Example
This example will be served using a static file server from the ./public directory, and the entrypoint html file is here:
./public/index.html:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Stack Overflow 73091042</title>
<!-- First, define an import map for the "leaflet" module specifier
which points to the UMD-to-ESM shim module: -->
<script type="importmap">
{
"imports": {
"leaflet": "/leaflet_umd_shim.js"
}
}
</script>
<!-- Then, import the entrypoint module: -->
<script type="module" src="/main.js"></script>
</head>
<body>
<h1>See console output</h1>
</body>
</html>
Nothing special there except maybe the import map if you aren't familiar: WICG/import-maps: How to control the behavior of JavaScript imports
Next, there are two TypeScript source files in the ./src directory which are transpiled to JavaScript and copied into the ./public directory during compilation.
The first is a shim:
./src/leaflet_umd_shim.ts:
// Creates a proxy to the UMD Leaflet object `window.L` as a type-safe ESM export
/*
This loads (and executes) the UMD Leaflet script the first time that
this module is imported into the module graph, which assigns
the UMD Leaflet object to `window.L`. This is scope pollution, and is
one of the things that ES modules avoid, but is necessary here because
you expressed dissatisfaction at the available Leaflet ES module options
at existing CDN URLs.
This proxy technique "works" well here because Leaflet
is an object export/namspace and is documented to be used this way. However,
note that — for other modules which provide multiple exports that are
intended to be imported individually by name — this technique wouldn't be
a good fit because it requires the entire UMD module to be made available
on a single (named) export. (Note that the default export is just a named export
using the name "default").
*/
import 'https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.8.0/leaflet.js';
import type * as Leaflet from 'leaflet';
const {L} = window as unknown as { L: typeof Leaflet };
// Same as `export {L as default}`:
export default L;
The "leaflet" import specifier in the import map is bound to the location of the JavaScript module produced by this file during compilation.
That specifier is used in the entrypoint module:
./src/main.ts:
/*
(Reference comments in "leaflet_umd_shim.ts" for context)
Example of non-working named import:
import {tileLayer} from 'leaflet';
It would throw the following runtime exception:
"Uncaught SyntaxError: The requested module 'leaflet' does not provide
an export named 'tileLayer'"
This technique requires importing the entire UMD module on a name (even if that
name is "default"):
*/
// Same as `import {default as L} from 'leaflet'`:
import L from 'leaflet';
const a = L.latLng(50.5, 30.5);
const b = L.latLng(51.5, 30.5);
const distance = a.distanceTo(b);
console.log({a, b, distance}); /* Prints the following:
{
"a": {
"lat": 50.5,
"lng": 30.5
},
"b": {
"lat": 51.5,
"lng": 30.5
},
"distance": 111194.92664455874
}
*/
When you serve this site on a local http server and access the HTML file, the main module will execute and print that information to the console using those methods from Leaflet to create the data that is logged, proving that this technique works.
Here's my TSConfig:
./tsconfig.json:
{
"compilerOptions": {
// Strict options (This is TS: type safety is important)
"exactOptionalPropertyTypes": true,
"isolatedModules": true,
"noUncheckedIndexedAccess": true,
"strict": true,
"useUnknownInCatchVariables": true,
// ESM
"esModuleInterop": true,
"module": "esnext",
"moduleResolution": "nodenext",
"lib": [
"esnext", // Latest ES syntax features
"dom", // Browser runtime environmnt
"dom.iterable" // Browser runtime environmnt
],
"target": "esnext", // Adjust this to your browser target needs
"outDir": "public", // Directory from which the site will be served
// Path mapping
// Ref: https://www.typescriptlang.org/docs/handbook/module-resolution.html#path-mapping
"baseUrl": ".",
"paths": {
"leaflet": ["node_modules/#types/leaflet"]
},
// Optional settings
"removeComments": true
},
"include": ["src/**/*"]
}
And, lastly, here's the npm package file:
./package.json:
{
"name": "so-73091042",
"version": "0.1.0",
"type": "module",
"scripts": {
"compile": "tsc",
"serve": "static --port=8000 --cache=false public"
},
"license": "MIT",
"devDependencies": {
"#types/leaflet": "^1.7.11",
"node-static": "^0.7.11",
"typescript": "^4.7.4"
},
"volta": {
"node": "16.16.0"
}
}
You can ignore the volta property: it just shows that I was using Volta and the version of Node that I had installed when creating this repository example.
The node-static dependency is the package recommended by the official Node.js website for serving static files in the article How to serve static files | Node.js.
First use npm install to install the dependencies:
% npm install
added 9 packages, and audited 10 packages in 4s
Then — to compile the TS files and emit them — use npm run compile:
% npm run compile
> so-73091042#0.1.0 compile
> tsc
There should now be two new files in the ./public directory after compilation:
./public/leaflet_umd_shim.js:
import 'https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.8.0/leaflet.js';
const { L } = window;
export default L;
./public/main.js:
import L from 'leaflet';
const a = L.latLng(50.5, 30.5);
const b = L.latLng(51.5, 30.5);
const distance = a.distanceTo(b);
console.log({ a, b, distance });
Now everything is ready to be served by the static file server, so use the command npm run serve:
% npm run serve
> so-73091042#0.1.0 serve
> static --port=8000 --cache=false public
serving "public" at http://127.0.0.1:8000
If you navigate to http://127.0.0.1:8000 in your browser (this is the same as http://localhost:8000), you'll see the index page with the text "See console output", and if you look at your browser's JS console, you'll see a representation of the object data that was logged to the console in the main.js module.
When you're ready to stop the server, just use ctrl + c in your terminal
And that's it!

CLI for todo App - help debugging current solution using Commander or change approach to Readline and Event Emitter?

I am trying to build a CLI for a node js only todo app using commander and conf modules in node js, with chalk to colour the output . I am not sure how to resolve the errors being returned:
ReferenceError: require is not defined in ES module scope, you can use import instead
This file is being treated as an ES module because it has a '.js' file extension
contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.
I'm getting the above error for both conf and commander
Any suggestions on how I could go about debugging this, or changing approach to using readline and events/EventEmitter would be better, will be appreciated, Thanks
Below is a REDACTED version of code:
list.js
const conf = new (require('conf'))();
const chalk = require('chalk');
function list() {
const todoList = conf.get('todo-list');
if (todoList && todoList.length) {
console.log(
chalk.blue.bold(
'Tasks in green are done. Tasks in yellow are still not done.'
)
}
}
module.exports = list;
index.js file
const { program } = require('commander');
const list = require('./list');
program.command('list').description('List all the TODO tasks').action(list);
program.command('add <task>').description('Add a new TODO task').action(add);
program.parse();
package.json file
{
"main": "index.js",
"type": "module",
"keywords": [],
"dependencies": {
"chalk": "^5.0.0",
"chalk-cli": "^5.0.0",
"commander": "^8.3.0",
"conf": "^10.1.1"
},
"bin": {
"todos": "index.js"
}
}

In your package.json you have:
"type": "module",
This means files with the .js suffix are assumed to be ECMAScript rather than CommonJS. If you want to use CommonJS you can change the file suffix or change the "type" property.
Or you can use the new syntax. In ECMAScript you use import, in CommonJS you use require.
To read more about "type" see: https://nodejs.org/dist/latest-v16.x/docs/api/packages.html#determining-module-system

After some more research I found out I was 'muddying the waters' between CJS or ESM modules.
CJS modules use require and that is the old way of doing things prior to ES6 modules
ESM modules use import
My package.json says type: module telling NodeJS that I am using ESM. But the code is saying CJS.
These are the steps I take to fix this:
rename index.js to index.mjs
update package.json accordingly
replace all require calls with import statements
replace module.exports = list with default export = list (or used a named export)

webpack - transpile 1 ts file without bundling it (2 entries)

TL;DR
(vue files) + background.ts => ...[webpack]... => (bundled vue files) + background.js
can't execute background.js
expected background.js to contain only "console.log('test');"
I have a vue project with webpack and typescript.
I want my build step to produce a "background.js" file aside from the [vue JS related files].
I have a source file in typescript: "background.ts".
Through the vue.config.js I added a webpack entry "background".
It does build a file "background.js" as I expected
but it is bundled(I think) and it can't be executed by a chrome plugin.
For now all I want is to have a "background.js" file which execute the "console.log('test');" instruction it contains when the script is called.
Thank you, webpack is hell
edit: adding files:
// vue.config.js
const CopyWebpackPlugin = require('copy-webpack-plugin');
module.exports = {
filenameHashing: false,
chainWebpack: config => {
// add your custom entry point
config
.entry('background')
.add('./src/background.ts');
},
configureWebpack: {
plugins: [
new CopyWebpackPlugin([
{ from: 'manifest.json', to: 'manifest.json', flatten: true },
]),
]
}
}
content of "$vue inspect"
$vue inspect > https://pastebin.com/6F3zwLhC
What I tried:
exporting a function instead of my plain code:
export default function() {
console.log("gboDebug: background.ts dans export function");
}
// instead of just
console.log("gboDebug: background.ts dans export function");
at the end of the file adding this because I saw it somewhere:
export default null;
checked that my console.log was in the background.js bundled file
pasted the result of background.js in the navigator
played with the webpackJsonp global var the scripts creates
What I thought about:
having a npm script which 1-bundle-vue-webpack and then 2-transpile my file with babel-loader
playing with the library output option in webpack but I think it makes code available for use in a variable, it doesn't auto-execute code when loaded
webpack output in IIFE: https://webpack.js.org/configuration/output/#outputiife

In short – you don't need a bundler for transpiling a single typescript file. Just use tsc.
Specifically to this question where the Vue app is used as part of chrome extension, it may make sense to separate building an app and the extension related files.
Another possible option is to use something like Vue CLI Browser Extension Plugin.

Path aliases for imports in WebStorm

I use webpack path aliases for ES6 module loading.
E.g. If I define an alias for utils instead of something like
import Foo from "../../../utils/foo", I can do
import Foo from "utils/foo"
The problem is that once I start using aliases, WebStorm looses track of the import and I'm left with warnings and no auto-completion.
Is there a way to instruct WebStorm to use such aliases?

Yes, there is.
In fact, Webstorm can't automatically parse and apply Webpack config, but you can set up aliases the same way.
You just have to mark the parent folder of "utils" (in your example) as a resource root (right-click, mark directory as / resource root).
We just managed to do with the following structure :
/src
/A
/B
/C
We have A B and C folders declared as alias in Webpack.
And in Webstorm we marked "src" as "Resource Root".
And now we can simply import :
import A/path/to/any/file.js
instead of
import ../../../../../A/path/to/any/file.js
while still having Webstorm correctly parsing and indexing all code, link to files, autocompleting and so on ...

I managed to set up aliases for WebStorm 2017.2 within webpack like this:

For the record: in PHPSTORM, working with laravel mix, I managed to solve this by creating a webpack.config.js file separately like:
const path = require('path')
const webpack = require('webpack')
module.exports = {
...
resolve: {
extensions: ['.js', '.json', '.vue'],
alias: {
'~': path.resolve(__dirname, './resources/assets/js')
}
},
...
}
And then importing it in the webpack.mix.js like:
const config = require('./webpack.config')
...
mix.webpackConfig(config)
Make sure the webpack configuration file is pointed correctly in the configuration of the PhpStorm in: Settings > Languages & Frameworks > Javascript > Webpack

You can define custom paths, so WebStorm/PhpStorm can understand your aliases. But make sure, they are identical with your aliases. Create file in your root directory and call it something like this: webStorm.config.js (any js file will be ok). Then configure your paths inside:
System.config({
"paths": {
"components/*": "./src/components/*",
"core/*": "./src/core/*",
...
}
});
WebStorm/PhpStorm will recognize System as it's own module and will treat this file as configuration.

This is answered in a comment but to save people digging into comments and link only information, here it is:
As of WS2017.2 this will be done automatically. The information is here.
According to this, webstorm will automatically resolve aliases that are included within the webpack.config in the root of the project. If you have a custom structure and your webpack.config isn't in the root folder then go to Settings | Languages & Frameworks | JavaScript | Webpack and set the option to the config you require.
Note: Most setups have a base config which then call a dev or prod version. In order for this to work properly, you need to tell webstorm to use the dev one.

Not right now, We were also using path aliases for the files in our react project. The import names were shorter but we lost a lot on static checking of webstorm as well as completion features.
We later came up with a decision to reduce the code to only 3 levels of depth, as well a single level for the common parts. The path completion feature of webstom (ctrl + space) even helps reduce the typing overhead. The production build does not use longer names, so hardly makes any difference in final code.
I will suggest please reconsider your decision about aliases. You loose semantic meaning of modules coming from node_modules and your own code, as well as referencing the alias files again and again to make sense of your code, is a much bigger overhead.

add jsconfig.js on your project root
{
"compilerOptions": {
"baseUrl": ".",
"paths": {
"~/*": ["./src/*"]
}
}
}

In PHPStorm (using 2017.2 currently), I have not been able to get webpack configs to work properly in regards to aliases.
My fix involves using the "Directories" section of the main settings. I just had to mark each folder referenced by an alias as a sources root, then click the properties dropdown for each and specify the alias as a "Package prefix". This made everything link up for me.
Not sure if the Directories section exists in WebStorm, but if it does, this seems to be a fool-proof method for getting import aliases working.

For anyone struggling: path.resolve() must be called with "__dirname" first argument for Idea (Websorm) to be able to resolve the path correctly.
Will work for Idea (Websorm):
alias: {
'#someAlias': pathLib.resolve(__dirname, 'path/to/directory')
}
Will not work for Idea (Websorm) (while still being valid webpack alias):
alias: {
'#someAlias': pathLib.resolve('path/to/directory')
}

Webstorm can't read webpack.config if module.exports return a function.
For example
module.exports = function (webpackEnv) {
return {
mode: isEnvProduction ? 'production' : isEnvDevelopment && 'development',
...
}
}
Check your config file, maybe this cause you are a problem.

There is a lot of discussion here about Laravel Mix, so I'll leave this here to help out future readers. I solved this by creating a separate (fake) webpack config file which is only used by my IDE (PHPStorm).
1. Create a separate alias.js file (e.g. /webpack/alias.js)
const path = require('path');
const assets = path.join(__dirname,'..','resources','assets');
module.exports = {
'#js' : path.resolve(assets, 'js'),
'#c' : path.resolve(assets, 'js', 'components'),
'#errors' : path.resolve(assets, 'js', 'errors'),
'#utils' : path.resolve(assets, 'js', 'utils'),
'#store' : path.resolve(assets, 'js', 'store'),
'#api' : path.resolve(assets, 'js', 'api'),
'#less' : path.resolve(assets, 'less')
}
2. Require the alias.js file into webpack.mix.js
const mix = require('laravel-mix');
mix.alias(require('./webpack/alias'))
// ... The rest of your mix, e.g.
.js('app.js')
.vue()
.less('app.less');
3. Create the fake webpack config for your IDE (e.g. /webpack/ide.config.js)
Here, import the laravel-mix webpack config, plus your aliases, and any other config that the IDE might need help finding. Also include the prefixed ~ aliases for importing styles into your Vue components.
/*
|--------------------------------------------------------------------------
| A fake config file for PhpStorm to enable aliases
|--------------------------------------------------------------------------
|
| File > Settings... > Languages & Frameworks > Javascript > Webpack
|
| Select "Manually" and set the configuration file to this
|
*/
const path = require('path');
const mixConfig = require('./../node_modules/laravel-mix/setup/webpack.config')();
module.exports = {
...mixConfig,
resolve: {
alias: {
...require('./alias'),
'~#less' : path.resolve('#less'), // <--
},
...mixConfig.resolve
}
}
4. Set your IDE to use webpack/ide.config.js as your webpack config file.

Had the same problem on a new Laravel project with Jetstream. The webpack.config.js was present and correct. But PHPStorm still didn't recognize the # symbol as a resource root.
After opening the webpack config, I got a notification:
After Clicking on Trust project and run, the # symbol became recognized.
I know that this isn't the solution or use-case for everyone. But I still found it worthy to note on this post, because it helped me in my situation.
Using
laravel/framework:8.77.1
npm:8.3.0
node:v14.18.1

Visual Studio Chutzpah Running test on different projects with AMD modules

I have two projects under a solution, one is my main web project, say MyProject and the other serves for testing purposes, say MyProject.Tests.
Solution
MyProject
MyProject.Tests
I want to have my JavaScript headless tests running to the second one.
On the first project, all the javascript files are under the Scripts directory, like so:
Scripts/
Common.js
Libs/
jquery/
jquery.js
requirejs/
require.js
At the test project, I have my chutzpah.json file on root.
MyProject.Tests
chutzpah.json
Tests/
Specs/
spec.js
The file has this configuration:
{
"Framework": "jasmine",
"TestHarnessReferenceMode": "AMD",
"TestHarnessLocationMode": "SettingsFileAdjacent",
"Tests": [ { "Path": "Tests/Specs" } ],
"AMDBasePath": "../MyProject/Scripts",
"CodeCoverageExcludes": ["*Common.js"],
"References": [
{ "Path": "../MyProject/Scripts/Libs/requirejs/require.js" },
{ "Path": "../MyProject/Scripts/Common.js" }
]
}
But when I try to run the spec file I get an error.
Spec file:
define(["jquery"], function ($) {
//code here. Doesn't matter, the error is because of the jquery module
});
The error, is this:
Error: Error opening C:/Users/g.dyrrahitis/Documents/Visual Studio 2013/Projects/MySolution/MyProject.Tests/Scripts/Libs/jquery/jquery.js: The system cannot find the path specified.
The thing is that chutzpah tries to find my jquery module at the test project rather the main project, where it resides.
Why I'm getting this kind of behavior and how can I solve this please? I've been trying for hours to tackle this with no luck so far.
Note
*The names MySolution, MyProject, MyProject.Tests are used for clarity, rather than using the real names.

I've found it, the chutzpah file hadn't the right configuration options (as expected) for the test harness directory.
I needed the TestHarnessDirectory and TestHarnessLocationMode options to explicitly instruct it to look at my main project directory.
This now is the correct one:
{
"TestHarnessDirectory": "../MyProject",
"TestHarnessLocationMode": "Custom",
"TestHarnessReferenceMode": "AMD",
"Framework": "jasmine",
"Tests": [ { "Path": "JavaScript/Specs" } ],
"AMDBasePath": "../MyProject/Scripts",
"CodeCoverageExcludes": [ "*Common.js" ],
"References": [
{ "Path": "../MyProject/Scripts/Libs/requirejs/require.js" },
{ "Path": "../MyProject/Scripts/Common.js" }
]
}
Just needed to tell chutzpah that the harness location mode is custom, in order to provide a directory for it, which is the root of my main project.
Beware for the right configuration paths then, you may end up struggling for hours like me to find a solution. And read the documentation thoroughly (which I hadn't done).

Develop Reference

JavaScript is the programming language of the Web.