Basically, module loading is a pain in JavaScript right now sigh...
So I have a TypeScript application I'd like to be compiled with webpack. The issue is that my editor (vscode) seems to expect that modules are imported without extensions. For example:
import {IServer} from "../server/server";
In webpack, I can only get this to work if I include an extension. If I include an extension (i.e. "../server/server.ts") it builds in webpack, but the editor doesn't recognize it and throws an error that the module wasn't found. If I omit an extension (i.e. "../server/server"), webpack won't load it (it says it can't find the module "../server/server"), but the editor will load it for purposes of code-completion, etc.
This leads me to believe that importing modules in TypeScript are expected to be done without extensions, whereas in the webpack ecosystem, they are required (which makes sense with how loaders work, etc).
This leaves a very bad taste in my mouth. My question here is: is my conclusion correct? Do I have to trade off between the build system or the editor? Or am I missing something? Is it possible to have the webpack typescript loader silently add in the extensions so the modules are properly recognized by webpack during the build?
I have the following webpack.config.js file:
module.exports = [
{
name: "Server",
entry: "./src/server/server.ts",
output: {
filename: "./server/server.js"
},
target: "node",
resolve: [".ts", ".js"],
module: {
loaders: [
{ test: /\.ts$/, loader: 'ts-loader' }
]
}
},
{
name: "Client",
entry: "./src/client/scripts/client.ts",
output: {
filename: "./public/scripts/client.js"
},
resolve: ["", ".ts", ".js", ".less"],
module: {
loaders: [
{ test: /\.ts$/, loader: 'ts-loader' },
{ test: /\.less$/, loader: "style!css!less" },
{ test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: "url-loader?limit=10000&minetype=application/font-woff" },
{ test: /\.(ttf|eot|svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: "file-loader" },
{ test: /\.png$/, loader: "url-loader?mimetype=image/png" }
]
}
}
];
And the following tsconfig file:
{
"compilerOptions": {
"target": "ES5",
"module": "commonjs",
"jsx": "react"
},
"files": [
"src/shared/typings/tsd.d.ts",
"src/shared/typings/webpack.d.ts"
]
}
And I'm using the following packages in node:
"babel-core": "^6.2.1",
"babel-loader": "^6.2.0",
"babel-preset-es2015": "^6.1.18",
"css-loader": "^0.23.0",
"file-loader": "^0.8.5",
"less": "^2.5.3",
"less-loader": "^2.2.1",
"react-hot-loader": "^1.3.0",
"style-loader": "^0.13.0",
"ts-loader": "^0.7.1",
"typescript": "^1.6.2",
"url-loader": "^0.5.7",
"webpack-dev-server": "^1.12.1",
"moment": "^2.10.6"
is my conclusion correct
No. Extensions should definitely not be there.
Fix
resolve: [".ts", ".js"],
Should be :
resolve: {
extensions: ['.ts', '.js']
},
When in doubt, check the tests : https://github.com/TypeStrong/ts-loader/tree/master/test
in webpack, I can only get this to work if I include an extension.
Definitely not needed.
whereas in the webpack ecosystem, they are required
No again. They are not required.
entry: "./src/server/server.ts",
This should be entry: "./src/server/server". Also checkout the extensive list of tests https://github.com/TypeStrong/ts-loader/tree/master/test
I overcame all the compiling issues and created a project template here, https://github.com/c9s/ts-webpack
You can just clone the project to start without fighting with the config files...
Related
Desired Behaviour
I want to be able to:
Use webpack to define a build process that uses babel to convert an ES6 server side Node file to "plain javascript"
Current Behaviour
If I just run:
node app.js
I get import errors:
import express from "express";
^^^^^^^
SyntaxError: Unexpected identifier
What I've Tried
When I try and define a build process in webpack, I get errors like:
Can't resolve
tls/net/fs/dns/child_process/aws-sdk/./local_settings/npm/node-gyp
There is a possible solution offered here, but it doesn't resolve all errors (these errors remain: aws-sdk, ./local_settings, npm, node-gyp):
target: "node"
There are also warnings like:
Module parse failed: Unexpected token
Critical dependency: the request of a dependency is an expression
This "how do I use ES6 in production?" question seems to be common, eg:
NodeJS in ES6/ES7, how do you do it in production?
Quickstart guide to using ES6 with Babel, Node and IntelliJ
Getting ready for production use
Is it okay to use babel-node in production
but none of the answers I have found seem definitive or specifically relate to a webpack solution.
Below is code I have now:
from webpack.config.js
const path = require('path');
console.log("the __dirname is: " + __dirname);
module.exports = {
entry: "./src/js/app.js",
output: {
filename: "app.js",
path: path.resolve(__dirname, "dist/js")
},
target: "node",
mode: "development",
module: {
rules: [{
test: /\.js$/,
exclude: /(node_modules)/,
use: {
loader: "babel-loader",
options: {
presets: ["env", "stage-0"]
}
}
},
{
test: /\.css$/,
use: [
{ loader: "style-loader" },
{ loader: "css-loader" }
]
},
{
test: /\.less$/,
use: [
{ loader: "style-loader" },
{ loader: "css-loader" },
{ loader: "less-loader" }
]
},
{
test: /\.jpg$/,
use: [
{ loader: "url-loader" }
]
}
]
}
}
from package.json:
...
"main": "app.js",
"scripts": {
"start": "nodemon ./app.js --exec babel-node -e js",
"build": "webpack",
"watch": "webpack --w"
},...
"dependencies": {
"bcrypt": "^2.0.1",
"body-parser": "^1.18.2",
"cors": "^2.8.4",
"express": "^4.16.3",
"jsonwebtoken": "^8.2.1",
"mongodb": "^3.0.8"
},
"devDependencies": {
"babel-cli": "^6.26.0",
"babel-core": "^6.26.3",
"babel-loader": "^7.1.4",
"babel-preset-env": "^1.7.0",
"babel-preset-stage-0": "^6.24.1",
"css-loader": "^0.28.11",
"file-loader": "^1.1.11",
"less": "^3.0.4",
"less-loader": "^4.1.0",
"style-loader": "^0.21.0",
"url-loader": "^1.0.1",
"webpack": "^4.8.3",
"webpack-cli": "^2.1.3"
}
Question
What should my webpack.config.js and package.json files look like in order to successfully convert the ES6 file to "plain javascript"?
By default, Webpack tries to bundle everything into a single .js file. For client-side projects this is fine, but for NodeJS projects it becomes slightly more complicated because you are including code from node_modules as well. Sometimes that can cause errors like the one you're seeing here.
What you want to do in addition to targets: "node" is tell Webpack not to bundle external dependencies (i.e. node_modules).
There's a useful library called webpack-node-externals that helps with this:
var nodeExternals = require('webpack-node-externals');
...
module.exports = {
...
target: 'node', // in order to ignore built-in modules like path, fs, etc.
externals: [nodeExternals()], // in order to ignore all modules in node_modules folder
...
};
So it's not really about "plain javascript", more like trying to get Webpack to output a file which is compatible with the NodeJS ecosystem.
I am trying to setup a new project and am having a bit of trouble with webpack-dev-server, it looks like the client compiles successfully but I cannot view the index.html or the main.js, they just dont seem to be available.
I have tried a bunch of different webpack config setups but none of them seem to work.
I have a project which has a client and a server directory, my folder structure looks like:
> project
> dist
> src
> client
client.tsx
webpack.config.js
> server
package.json
In package.json I have a dev client script: "dev-client": "cd ./src/client && webpack-dev-server -w",
my webpack.config.js looks something like this (i have changed it around quite a bit trying to get this to work):
const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const projectRoot = path.join(__dirname, "..", "..");
module.exports = {
devtool: "inline-source-map",
mode: "development",
entry: "./client",
output: {
path: path.join(projectRoot, "dist", "public"),
publicPath: "/public/",
},
resolve: {
extensions: [".js", ".ts", ".tsx"],
},
module: {
rules: [
{
test: /\.tsx?$/,
use: {
loader: "ts-loader",
},
},
{
test: /\.scss$/,
use: [
{
loader: "style-loader",
},
{
loader: "css-loader",
},
{
loader: "sass-loader",
},
],
},
{
test: /\.(jpe?g|gif|png|svg|woff|woff2|ttf|eot)$/,
use: {
loader: "url-loader",
options: {
limit: 10000,
},
},
},
],
},
plugins: [
new HtmlWebpackPlugin(),
],
devServer: {
contentBase: path.join(projectRoot, "dist"),
},
}
When I run npm run dev-client I get the success message i 「wdm」: Compiled successfully. but when I navigate to http://localhost:8080/ all I see is the server which gets compiled to the dist folder.
Dependencies info:
"css-loader": "^0.28.11",
"file-loader": "^1.1.11",
"html-webpack-plugin": "^3.2.0",
"node-sass": "^4.9.0",
"sass-loader": "^7.0.1",
"style-loader": "^0.21.0",
"ts-loader": "^4.2.0",
"url-loader": "^1.0.1",
"webpack": "^4.6.0",
"webpack-cli": "^2.0.15",
"webpack-dev-server": "^3.1.3"
So after a bunch of testing I figured out that rolling back to 3.1.1 of webpack-dev-server fixed the issue, this lead me onto this issue:
https://github.com/webpack/webpack-dev-server/issues/1373
Which says that the issue is caused by spaces in the project path. I removed the spaces and it worked perfectly.
Posting here in case someone else has the same issue.
In my project
package.json (listed only babel related packages):
"#babel/core": "7.0.0-beta.37",
"#babel/plugin-syntax-dynamic-import": "7.0.0-beta.37",
"#babel/register": "7.0.0-beta.37",
"babel-eslint": "https://github.com/kesne/babel-eslint.git#patch-1",
"babel-helper-annotate-as-pure": "^7.0.0-beta.3",
"babel-loader": "^8.0.0-beta.0",
"babel-minify-webpack-plugin": "^0.2.0",
"babel-plugin-istanbul": "^4.1.5",
"babel-plugin-transform-class-properties": "^7.0.0-beta.3",
"babel-plugin-transform-decorators": "^7.0.0-beta.3",
"babel-plugin-transform-es2015-modules-commonjs": "^7.0.0-beta.3",
"babel-plugin-transform-es2015-template-literals": "^7.0.0-beta.3",
"babel-preset-typescript": "^7.0.0-alpha.19",
"webpack": "^3.5.5",
"webpack-dev-server": "^2.7.1"
npm package "ui/base" is written in ES 6.
And I am trying to import it on a page like
import '#ui/base';.
package.json of "ui/base".
"babel-core": "^6.26.0",
"babel-eslint": "^8.0.3",
"babel-loader": "^7.1.2",
"babel-plugin-transform-class-properties": "^6.24.1",
"babel-plugin-transform-decorators-legacy": "^1.3.4",
"babel-plugin-transform-es2015-modules-commonjs": "^6.26.0",
"babel-polyfill": "^6.26.0",
"babili-webpack-plugin": "^0.1.2",
"webpack-dev-server": "^2.7.1",
"webpack-node-externals": "^1.6.0"
The built version of a package is in ui/base/target/package/#ui/base/0/Main.js
Now, during the build process of my project, I am getting an error saying
ERROR in ./node_modules/#ui/base/src/components/accordion/Accordion.js
Module parse failed: Unexpected character '#' (18:0)
You may need an appropriate loader to handle this file type.
| import style from './accordion.css';
|
| #Define(`ui-base-v${__VERSION__}-accordion`, {
| style,
| })
The error is being thrown from the source of components. The built version of a package is not being taken in a build process of a project.
I am using following rules in webpack to build the project.
// Resolve imports to Typescript too without needing .ts
module.exports.resolve = {
extensions: ['.js', '.ts'],
};
module.exports.rules = [
{
test: /\.(js|ts)$/,
exclude: /node_modules/,
use: [{
loader: 'babel-loader',
}],
},
{
test: /\.html$/, // plugin to import HTML as a string
use: [{
loader: 'raw-loader',
options: {
exportAsEs6Default: true,
},
}],
},
{
test: /\.(less|css)$/,
use: [
{
loader: 'css-to-string-loader', // creates style nodes from JS strings
},
{
loader: 'css-loader', // translates CSS into CommonJS,
options: { url: false },
},
{
loader: 'less-loader', // compiles Less to CSS
}],
},
];
Below is the .babelrc in a project.
function istanbulHacks() {
return {
inherits: require("babel-plugin-istanbul").default,
};
}
const config = {
plugins: [
"#babel/plugin-syntax-dynamic-import",
"transform-decorators",
["transform-class-properties", { "loose": true }],
"transform-es2015-modules-commonjs",
["transform-es2015-template-literals", { "loose": true }],
],
presets: [
"typescript"
],
};
if (process.env.BABEL_ENV === "test") {
config.auxiliaryCommentBefore = "istanbul ignore next";
config.plugins.push(istanbulHacks);
}
module.exports = config;
Everything works fine without using the package written in ES6.
UPDATE
If I change "main" in package.json of #ui/base to
"main": "./target/package/#eui/base/0/Main.js",
then it works. Actually, "main" is point to "./src/index.js".
I am confused here as well. Why does "main" not point to the build version of a package ?
How to resolve this issue ? Is there any version incompatibility with babel or webpack ? Why I am not getting built version of npm package written in ES6 ?
Couple options:
Are we sure the import is correct? usually if its npm, there will be es5 code in the package. I see that your import is from /#ui/base/src I've see src contain es6 files, while another directory contains the transpiled es5 code, perhaps lib, or dist. Can you check the node_modules folder to see whats in ui/base?
You can tell webpack to parse ui/base, right now, your webpack will exclude node_modules thats good, you can also tell webpack to include the es6 code. Then it will get transpiled along with your source code.
Quick example of #2:
include: [
path.resolve(__dirname, "app")
],
exclude: [
path.resolve(__dirname, "app/demo-files")
],
https://webpack.js.org/configuration/
My webpack compilate is not transpiled into the right JS. It writes
exports default MultiLanguage
instead of
module.exports = { MultiLanguage: MultiLanguage};
My .bablerc
{
"presets": ["es2015", "stage-0"],
"plugins": ["transform-runtime"]
}
My package.json
{
"name": "myapp",
"version": "0.0.1",
"description": "My app",
"dependencies": {
"bootstrap": "^3.3.7",
"vue": "^2.4.2",
"vue-multilanguage": "^2.1.1"
},
"devDependencies": {
"babel-cli": "^6.24.1",
"babel-core": "^6.25.0",
"babel-loader": "^6.4.1",
"babel-plugin-transform-runtime": "^6.1.2",
"babel-preset-es2015": "^6.24.1",
"babel-preset-stage-0": "^6.1.2",
"babel-runtime": "^5.8.0",
"webpack": "^1.15.0"
},
"author": "You"
}
My webpack.config.js
module.exports = {
entry: './src/main.js',
output: {
path: './dist',
filename: 'build.js'
},
module: {
loaders: [
{
test: /\.js$/,
loader: 'babel',
exclude: /node_modules/
}
]
}
}
And therefor the error and the code where it hits in the build.js
in Chromium/Chrome und ubuntu:
Uncaught SyntaxError: Unexpected token export
in Firefox:
SyntaxError: export declarations may only appear at top level of a module
export default MultiLanguage
Here also the vue code (main.js):
import Vue from 'vue/dist/vue.js'
import MultiLanguage from 'vue-multilanguage/src/vue-multilanguage.js'
Vue.use(MultiLanguage, {
default: 'en',
en: {
hi: 'Hello',
welcome: 'Welcome, {name}'
},
pt: {
hi: 'Ola',
welcome: 'Bem-vindo, {name}'
}
})
any recommanded tutorials? any idea?
when I replace the line in build.js wit module.exports = { MultiLanguage: MultiLanguage}; the error does not occure
Your problem is linked to your import.
vue-multilanguage.js is not provided pre-compiled by its author (which is rare, usually libraries include a dist file ready to be used...) and as it is in your node_modules folder, it is not transformed from ES6 to ES5 by your babel loader as well. You need to add an exception in your webpack.config.js.
module.exports = {
entry: './src/main.js',
output: {
path: './dist',
filename: 'build.js'
},
module: {
loaders: [
{
test: /\.js$/,
loader: 'babel-loader',
// exclude everything from node_modules, except vue-multilanguage
exclude: /node_modules(?![\\/]vue-multilanguage[\\/])/
}
]
}
}
Not directly related, but not that I also replaced 'babel' by 'babel-loader', to avoid some bugs with older packages. See here.
Also, you can (and you probably should), as mentioned in the comments, import vue this way.
import Vue from 'vue';
Side note:
According to their package.json, there should be a file ready to be used in their library, located at dist/vue-multilanguage.js. But they oddly added their dist folder into their .npmignore file, and so it's not included. That's probably an error. I'll post an issue on their github. Once it's corrected, and if you update your package, you should be able to simply import vue-multi like this (without adding any exception to your webpack config):
import MultiLanguage from 'vue-multilanguage'
I would use next imports:
import Vue from './vue';
import MultiLanguage from './vue-multilanguage';
I am a beginner trying to use Electron (formerly Atom) and Reactjs bundled with Webpack. Everything was working fine until I tried to use Electron's remote module to access the mainWindow in my React components.
Trying to import this module, I get the infamous error:
Uncaught Error: ENOENT: no such file or directory, open '/path.txt'
I've tried reinstalling electron and I've checked node_modules/electron, and found that path.txt is there.
Here is my webpack.config.js:
var webpack = require('webpack');
module.exports = {
context: __dirname,
entry: {
app: ['webpack/hot/dev-server', './src/App.jsx'],
},
target: 'node',
output: {
path: './public/built',
filename: 'bundle.js',
publicPath: 'http://localhost:8080/built/'
},
devServer: {
contentBase: './public',
publicPath: 'http://localhost:8080/built/'
},
module: {
loaders: [
{
test: /\.jsx?$/,
loader: 'babel-loader',
exclude: /node_modules/,
include: /src/,
query: {
presets: ['es2015', 'react']
}
},
{
test: /\.(png|jpg)$/,
loader: 'file-loader?name=[path][name].[hash].[ext]'
},
{
test: /\.css$/,
loader: 'style-loader!css-loader'
}
]
},
plugins: [
new webpack.HotModuleReplacementPlugin()
]
}
And here is my package.json:
{
"name": "app",
"version": "0.1.0",
"main": "main.js",
"description": "description",
"license": "UNLICENSED",
"repository": {
"type": "git",
"url": "https://github.com"
},
"scripts": {
"start": "./node_modules/.bin/electron .",
"watch": "./node_modules/.bin/webpack-dev-server"
},
"dependencies": {
"electron": "^1.3.5",
"radium": "^0.17.1",
"react": "^15.0.1",
"react-dom": "^15.0.1"
},
"devDependencies": {
"babel": "^6.5.2",
"babel-core": "^6.7.7",
"babel-loader": "^6.2.4",
"babel-preset-es2015": "^6.6.0",
"babel-preset-react": "^6.5.0",
"css-loader": "^0.24.0",
"file-loader": "^0.9.0",
"style-loader": "^0.13.1",
"webpack": "^1.13.0",
"webpack-dev-server": "^1.14.1"
}
}
I suspect that it may have something to do with the start script in package.json as the path.txt is not in the same directory as node_modules/.bin/electron. However, I haven't figured out how to solve this.
in case it's not to late, you simply need to replace your "node" target with "electron-renderer" in your webpack.config.js
Just run command like below
cd node_modules/electron && node install.js
It will create path.txt file
For Mac the file contains like below
dist/Electron.app/Contents/MacOS/Electron