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I'm trying to test a Svelte component with Jest. This component works fine in the browser, but unit test fails with importing modules.
For example, when running Jest, import uuid from 'uuid' compiled as const { default: uuid } = require("uuid");, and calling uuid.v4() causes TypeError: Cannot read property 'v4' of undefined. When I use import * as uuid from 'uuid' or const uuid = require('uuid'), Jest unit test passes, but it doesn't work in the browser.
How can I deal with this issue? Any information would greatly help. Thank you.
package.json:
{
"name": "svelte-app",
"version": "1.0.0",
"scripts": {
"build": "rollup -c",
"dev": "rollup -c -w",
"start": "firebase serve --only hosting"
},
"devDependencies": {
"#rollup/plugin-json": "^4.0.0",
"#testing-library/jest-dom": "^5.1.1",
"#testing-library/svelte": "^1.11.0",
"bulma": "^0.8.0",
"eslint": "^6.7.0",
"eslint-config-standard": "^14.1.0",
"eslint-plugin-import": "^2.18.2",
"eslint-plugin-jest": "^23.0.4",
"eslint-plugin-node": "^10.0.0",
"eslint-plugin-promise": "^4.2.1",
"eslint-plugin-standard": "^4.0.1",
"eslint-plugin-svelte3": "^2.7.3",
"jest-transform-svelte": "^2.1.1",
"node-sass": "^4.13.1",
"rollup": "^1.12.0",
"rollup-jest": "0.0.2",
"rollup-plugin-commonjs": "^10.0.0",
"rollup-plugin-livereload": "^1.0.0",
"rollup-plugin-node-builtins": "^2.1.2",
"rollup-plugin-node-globals": "^1.4.0",
"rollup-plugin-node-resolve": "^5.2.0",
"rollup-plugin-svelte": "^5.0.3",
"rollup-plugin-terser": "^5.1.2",
"sirv-cli": "^0.4.5",
"svelma": "^0.3.2",
"svelte": "^3.18.2",
"svelte-preprocess": "^3.4.0"
},
"dependencies": {
"firebase": "^7.8.2"
},
"private": true
}
rollup.config.js
import json from '#rollup/plugin-json'
import commonjs from 'rollup-plugin-commonjs'
import builtins from 'rollup-plugin-node-builtins'
import globals from 'rollup-plugin-node-globals'
import livereload from 'rollup-plugin-livereload'
import resolve from 'rollup-plugin-node-resolve'
import svelte from 'rollup-plugin-svelte'
import { terser } from 'rollup-plugin-terser'
import preprocess from 'svelte-preprocess'
const production = !process.env.ROLLUP_WATCH
export default {
input: 'src/main.js',
output: {
sourcemap: true,
format: 'iife',
name: 'app',
file: 'public/build/bundle.js',
},
plugins: [
// https://github.com/rollup/plugins/tree/master/packages/json
json(),
svelte({
// enable run-time checks when not in production
dev: !production,
// we'll extract any component CSS out into
// a separate file — better for performance
css: css => {
css.write('public/build/bundle.css')
},
preprocess: preprocess(),
}),
// If you have external dependencies installed from
// npm, you'll most likely need these plugins. In
// some cases you'll need additional configuration —
// consult the documentation for details:
// https://github.com/rollup/rollup-plugin-commonjs
resolve({
browser: true,
dedupe: importee => importee === 'svelte' || importee.startsWith('svelte/'),
}),
commonjs(),
globals(),
builtins(),
// In dev mode, call `npm run start` once
// the bundle has been generated
!production && serve(),
// Watch the `public` directory and refresh the
// browser on changes when not in production
!production && livereload('public'),
// If we're building for production (npm run build
// instead of npm run dev), minify
production && terser(),
],
watch: {
clearScreen: false,
},
}
function serve () {
let started = false
return {
writeBundle () {
if (!started) {
started = true
require('child_process').spawn('npm', ['run', 'start'], {
stdio: ['ignore', 'inherit', 'inherit'],
shell: true,
})
}
},
}
}
jest.config.js
const sveltePreprocess = require('svelte-preprocess')
module.exports = {
displayName: { name: 'web', color: 'magentaBright' },
moduleFileExtensions: [
'js',
'json',
'svelte',
],
preset: 'rollup-jest',
transform: {
'\\.js$': 'rollup-jest',
'\\.svelte$': ['jest-transform-svelte', { preprocess: sveltePreprocess(), debug: true }],
},
setupFilesAfterEnv: ['#testing-library/jest-dom/extend-expect'],
}
It worked for me.
The issue seems like jest unable to resolve uuid while building the code at runtime.
Which is quite obvious because by default jest ignore node_modules packages.
I faced similar issues and resolved it. The approach is by configuration inform JEST that it has to include node_modules packages as well. In my project i used rollup-plugin-babel.
This is the babel plugin configuration
...
...
babel({
extensions: [ '.js', '.mjs', '.html', '.svelte' ],
runtimeHelpers: true,
exclude: [ 'node_modules/#babel/**', 'node_modules/core-js/**' ],
presets: [
[
'#babel/preset-env',
{
targets: '> 0.25%, not dead',
useBuiltIns: 'usage',
corejs: 3
}
]
]
})
And I've added babel-jest for transforming the jest.config.js
module.exports = {
preset: 'jest-puppeteer', //ignore the preset part, I used for puppeteer
transform: {
'^.+\\.js?$': require.resolve('babel-jest'),
"^.+\\.ts?$": "ts-jest" // this part is only required if you have typescript project
}
};
DO Not forget to install this packages like babel-jest, rollup-plugin-babel before using it.
I have been facing this same issue and have a work around by mocking the module in the test file and giving it a default key.
jest.mock('uuid', () => ({
default: {
v4: jest.fn(),
},
}))
Another way that seems to work is to destructure the import in the component file.
import { v4 as uuidv4 } from 'uuid'
Self answer:
Finally, I wrote a little preprocessor to replace import foo from 'foo' -> import * as foo from 'foo'
svelteJestPreprocessor.js
const svelteJestPreprocessor = () => ({
// replace `import foo from 'foo'` -> `import * as foo from 'foo'`
script: ({ content }) => ({
// process each line of code
code: content.split('\n').map(line =>
// pass: no import, import with {}, import svelte component
(!line.match(/\s*import/)) || (line.match(/{/)) || (line.match(/\.svelte/)) ? line
: line.replace(/import/, 'import * as'),
).join('\n'),
}),
})
module.exports = svelteJestPreprocessor
jest.config.js
const svelteJestPreprocessor = require('./svelteJestPreprocessor')
const sveltePreprocess = require('svelte-preprocess')
module.exports = {
moduleFileExtensions: [
'js',
'json',
'svelte',
],
preset: 'rollup-jest',
transform: {
'\\.js$': 'rollup-jest',
'\\.svelte$': ['jest-transform-svelte', {
preprocess: [
svelteJestPreprocessor(),
sveltePreprocess(),
],
}],
},
setupFilesAfterEnv: ['#testing-library/jest-dom/extend-expect'],
}
This is an unwanted workaround, but it works for now.
I created a small JS module which I intend to make an npm package, but for now is just on GitHub. This module is written in ES6 and SCSS, and is thus relying on webpack and babel for transpilation.
To test it, I created a separate project with a similar setup (webpack and babel). After npm installing my module, when trying to import it into my index.js, I get the following error in Chrome Developer Tools: (with x being my module's name)
index.js:11 Uncaught TypeError: x__WEBPACK_IMPORTED_MODULE_1___default.a is not a constructor
at eval (index.js:11)
at Object../src/index.js (main.js:368)
at __webpack_require__ (main.js:20)
at eval (webpack:///multi_(:8081/webpack)-dev-server/client?:2:18)
at Object.0 (main.js:390)
at __webpack_require__ (main.js:20)
at main.js:69
at main.js:72
I've looked through countless answers and tried countless solutions, to no avail. My module's setup is as follows.
.babelrc
{
"presets": [
["env", {
"targets": {
"browsers": ["ie >= 11"]
}
}]
],
"plugins": [
"transform-es2015-modules-commonjs",
"transform-class-properties"
]
}
webpack.common.js
const path = require('path')
const ExtractTextPlugin = require('extract-text-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const cleanWebpackPlugin = require('clean-webpack-plugin')
const baseSCSS = new ExtractTextPlugin('main/_base.css')
const themeSCSS = new ExtractTextPlugin('main/_theme.css')
module.exports = {
entry: {
example: [
path.join(__dirname, 'src', 'example', 'index.js')
],
main: [
'idempotent-babel-polyfill',
path.join(__dirname, 'src', 'index.js')
]
},
output: {
path: path.join(__dirname, 'dist'),
filename: path.join('[name]', 'index.js')
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader',
}
},
{
test: /\.scss$/,
use: ExtractTextPlugin.extract(
{
fallback: 'style-loader',
use: ['css-loader', 'sass-loader']
}
)
},
{
test: /\_base-scss$/,
use: baseSCSS.extract(
{
fallback: 'style-loader',
use: ['css-loader', 'sass-loader']
}
)
},
{
test: /\_theme-scss$/,
use: themeSCSS.extract(
{
fallback: 'style-loader',
use: ['css-loader', 'sass-loader']
}
)
}
]
},
plugins: [
new cleanWebpackPlugin('dist', {}),
new ExtractTextPlugin({ filename: path.join('example', 'style.css') }),
baseSCSS,
themeSCSS,
new HtmlWebpackPlugin({
inject: false,
hash: true,
template: path.join(__dirname, 'src', 'example', 'index.html'),
filename: path.join('example', 'index.html')
})
]
}
webpack.prod.js
const merge = require('webpack-merge')
const UglifyJSPlugin = require('uglifyjs-webpack-plugin')
const webpack = require('webpack')
const common = require('./webpack.common.js')
module.exports = merge(common, {
plugins: [
new UglifyJSPlugin({
sourceMap: true
}),
new webpack.DefinePlugin({
'process.env.NODE_ENV': JSON.stringify('production')
})
],
mode: 'production'
})
package.json
{
"name": "my-module-name",
"version": "1.0.0-beta.1",
"description": "",
"main": "dist/main/index.js",
"scripts": {
"start": "webpack-dev-server --config webpack.dev.js",
"server": "node src/server",
"format": "prettier-standard 'src/**/*.js'",
"lint": "eslint src",
"build": "webpack --config webpack.prod.js",
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "Liran",
"license": "ISC",
"devDependencies": {
"babel-core": "^6.26.0",
"babel-eslint": "^8.2.3",
"babel-loader": "^7.1.4",
"babel-plugin-transform-class-properties": "^6.24.1",
"babel-plugin-transform-es2015-modules-commonjs": "^6.26.2",
"babel-preset-env": "^1.7.0",
"clean-webpack-plugin": "^0.1.19",
"css-loader": "^0.28.11",
"eslint": "^4.19.1",
"extract-text-webpack-plugin": "^4.0.0-beta.0",
"html-webpack-plugin": "^3.2.0",
"idempotent-babel-polyfill": "^0.1.1",
"node-sass": "^4.9.0",
"prettier-standard": "^8.0.1",
"sass-loader": "^7.0.1",
"style-loader": "^0.21.0",
"uglifyjs-webpack-plugin": "^1.2.5",
"webpack": "^4.6.0",
"webpack-cli": "^2.0.15",
"webpack-dev-middleware": "^3.1.3",
"webpack-dev-server": "^3.1.3",
"webpack-merge": "^4.1.2"
}
}
Any help/pointers would be greatly appreciated. If you need more information, please let me know.
If you are not the library author and are having a problem consuming another library, you may be seeing an error like this:
TypeError: [LIBRARY_NAME]__WEBPACK_IMPORTED_MODULE_3__ is not a constructor
If that's the case, you may be importing the library incorrectly in your code (it may be a problem with default exports). Double check the library docs for usage.
It may be as simple as changing this:
import Foo from 'some-library/Foo';
to this:
import { Foo } from 'some-library';
It is not working because it is missing libraryTarget and library properties. By doing that webpack know which format of module you would like to create, i.e: commonjs (module.exports) or es (export).
I would do something like:
...
output: {
path: path.join(__dirname, 'dist'),
filename: path.join('[name]', 'index.js'),
library: "my-library",
libraryTarget: "umd" // exposes and know when to use module.exports or exports.
},
...
Besides setting the libraryTarget, it may also be necessary to move the export in the JavaScript file to the default.
function MyClassName() {
...
}
export default MyClassName;
And then in the webpack configuration the library type umd ...
(Note that I have used the newer library.type instead the older libraryTarget (see https://webpack.js.org/configuration/output/#outputlibrarytarget).
const path = require('path');
module.exports = {
mode: "production",
entry: '../wherever/MyClassName.js',
output: {
library: {
name: "MyClassName",
type: "umd", // see https://webpack.js.org/configuration/output/#outputlibrarytype
export: "default", // see https://github.com/webpack/webpack/issues/8480
},
filename: 'MyClassName.min.js',
path: path.resolve(__dirname, '../wherever/target/')
},
optimization: {
minimize: true
}
};
The export default makes the class available in JavaScript like the file was embedded directly, i.e.,
<script type="text/javascript" src="MyClassName.min.js"></script>
<script type="text/javascript">
<!--
var myInstance = new MyClassName();
// -->
</script>
Disclaimer: I added this answer even though the original question is three years old by now. After encountering the "is not a constructor" issue, it took me hours of searching to find the default solution. And that was the second time, I searched and found it :D
Cf. David Calhoun's answer, if you run into this with a third-party library, you may be trying to import a CommonJS module as an ECMAScript module. The workaround there seems to be to use require instead of import, e.g., instead of
import { Foo } from 'bar'
you need to write
const Foo = require('bar')
(There may be a more elegant way to handle this, but this is what worked for me.)
For me, it was the cache issue. Just cleared the cookies, cache data and closed, reopened the browser. It worked.
In my case, the error was being caused in React when trying to invoke JS's built-in Error constructor, or in other words, basically when calling throw new Error("something").
On inspection of my code, I realised I had a component called Error in my project which was being imported into the same file. The name clash between this component and JS's built-in Error constructor was causing the error mentioned in the question.
In case something is using wepack 5 + babel 7
"webpack": "5.73.0",
"#babel/core": "7.4.4",
"#babel/preset-env": "7.4.4",
"babel-loader": "8.0.5",
AND want to use class instead function, this worked for me:
class Person {
constructor(fname, lname, age, address) {
this.fname = fname;
this.lname = lname;
this.age = age;
this.address = address;
}
get fullname() {
return this.fname +"-"+this.lname;
}
}
export default Person;
In my case .babelrc was not necesary
tl;dr
Make sure that you import properly through index files.
Explanation
For me, this error was caused by importing through index files. I had multiple directories with their index.ts files that exported all the files inside the directory. These index files were accumulated/reexported by a main index.ts file so everything can be imported through it.
src/
├── index.ts
├── module1/
│ ├── index.ts
│ ├── file1.ts
│ └── file2.ts
└── module2/
├── index.ts
├── file3.ts
└── file4.ts
In file4.ts I had an import like this:
import { file1Class, file2Class, file3Class } from "src";
I had to split it into two separate imports:
import { file1Class, file2Class } from "src/module1";
import { file3Class } from "src/module2";
I´m building a monorepo using yarn workspaces, lerna and 2 different projects:
ux - a React component library built using create-react-app
auth - a React application that uses ux library built using create-react-app and then ejected (the ejection was done to try to solve the current linting and transpiling error).
My monorepo setup is:
project
|-------- node_modules
|-------- lerna.json
|-------- package.json
|-------- packages
|----------- auth
|------- node_modules
|------- src
|------- packages.json
|----------- ux
|------- node_modules
|------- src
|------- packages.json
lerna.json:
{
"lerna": "2.9.0",
"npmClient": "yarn",
"useWorkspaces": true,
"packages": [
"packages/*"
],
"version": "3.0.0"
}
Lerna root package.json:
{
"name": "myorganization",
"version": "3.0.0",
"license": "UNLICENSED",
"workspaces": ["packages/*"],
"private": true,
"scripts": {
"clean": "lerna clean -f --yes && rm -rf node_modules",
"reset": "yarn run clean && yarn",
"auth": "cd packages/auth && yarn start"
},
"devDependencies": {
"lerna": "^2.9.0"
}
}
ux package.json: (ux was not ejected)
{
"name": "#myorganization/ux",
"version": "3.0.0",
"author": "Me",
"private": true,
"license": "UNLICENSED",
"dependencies": {
"react": "^16.2.0",
"react-dom": "^16.2.0",
"react-scripts": "2.0.0-next.9754a231"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
},
"browserslist": {
"development": [
"last 2 chrome versions",
"last 2 firefox versions",
"last 2 edge versions"
],
"production": [
">1%",
"last 4 versions",
"Firefox ESR",
"not ie < 11"
]
},
"devDependencies": {
"eslint": "^4.19.0",
"eslint-plugin-react": "^7.7.0"
}
}
auth package.json:
{
"name": "#myorganization/auth",
"version": "3.0.0",
"private": true,
"author": "Me",
"license": "UNLICENSED",
"dependencies": {
"#myorganization/ux": "^3.0.0",
"#babel/core": "7.0.0-beta.38",
"#babel/runtime": "7.0.0-beta.38",
"autoprefixer": "7.2.5",
"babel-core": "7.0.0-bridge.0",
"babel-eslint": "8.2.1",
"babel-jest": "22.1.0",
"babel-loader": "8.0.0-beta.0",
"babel-preset-react-app": "4.0.0-next.9754a231",
"case-sensitive-paths-webpack-plugin": "2.1.1",
"chalk": "2.3.0",
"css-loader": "0.28.9",
"dotenv": "4.0.0",
"dotenv-expand": "4.0.1",
"eslint-config-react-app": "3.0.0-next.9754a231",
"eslint-loader": "1.9.0",
"eslint-plugin-flowtype": "2.41.0",
"eslint-plugin-import": "2.8.0",
"eslint-plugin-jsx-a11y": "6.0.3",
"extract-text-webpack-plugin": "3.0.2",
"file-loader": "1.1.6",
"fs-extra": "5.0.0",
"html-webpack-plugin": "2.30.1",
"identity-obj-proxy": "3.0.0",
"jest": "22.1.2",
"object-assign": "4.1.1",
"postcss-flexbugs-fixes": "3.2.0",
"postcss-loader": "2.0.10",
"promise": "8.0.1",
"raf": "3.4.0",
"react": "^16.2.0",
"react-dev-utils": "6.0.0-next.9754a231",
"react-dom": "^16.2.0",
"react-router-dom": "^4.2.2",
"style-loader": "0.19.1",
"svgr": "1.6.0",
"sw-precache-webpack-plugin": "0.11.4",
"thread-loader": "1.1.2",
"uglifyjs-webpack-plugin": "1.1.6",
"url-loader": "0.6.2",
"webpack": "3.10.0",
"webpack-dev-server": "2.11.0",
"webpack-manifest-plugin": "1.3.2",
"whatwg-fetch": "2.0.3"
},
"scripts": {
"start": "node scripts/start.js",
"build": "node scripts/build.js",
"test": "node scripts/test.js --env=jsdom"
},
"browserslist": {
"development": [
"last 2 chrome versions",
"last 2 firefox versions",
"last 2 edge versions"
],
"production": [
">1%",
"last 4 versions",
"Firefox ESR",
"not ie < 11"
]
},
"jest": {
"collectCoverageFrom": [
"src/**/*.{js,jsx,mjs}"
],
"setupFiles": [
"<rootDir>/config/polyfills.js"
],
"testMatch": [
"<rootDir>/src/**/__tests__/**/*.{js,jsx,mjs}",
"<rootDir>/src/**/?(*.)(spec|test).{js,jsx,mjs}"
],
"testEnvironment": "node",
"testURL": "http://localhost",
"transform": {
"^.+\\.(js|jsx|mjs)$": "<rootDir>/node_modules/babel-jest",
"^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
"^(?!.*\\.(js|jsx|mjs|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
},
"transformIgnorePatterns": [
"'[/\\\\]node_modules[/\\\\](?!' + paths.allLernaModules.join('|') + ').*\\.(js|jsx|mjs)$'",
"^.+\\.module\\.css$"
],
"moduleNameMapper": {
"^react-native$": "react-native-web",
"^.+\\.module\\.css$": "identity-obj-proxy"
},
"moduleFileExtensions": [
"web.js",
"mjs",
"js",
"json",
"web.jsx",
"jsx",
"node"
]
},
"babel": {
"presets": [
"react-app"
]
},
"eslintConfig": {
"extends": "react-app"
},
"devDependencies": {
"eslint": "^4.19.0",
"eslint-plugin-react": "^7.7.0"
}
}
Then I´ve changed the create-react-app created config/paths to grab the referenced packages:
"use strict";
const path = require("path");
const fs = require("fs");
const url = require("url");
// Make sure any symlinks in the project folder are resolved:
// https://github.com/facebookincubator/create-react-app/issues/637
const appDirectory = fs.realpathSync(process.cwd());
const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
const envPublicUrl = process.env.PUBLIC_URL;
function ensureSlash(path, needsSlash) {
const hasSlash = path.endsWith("/");
if (hasSlash && !needsSlash) {
return path.substr(path, path.length - 1);
} else if (!hasSlash && needsSlash) {
return `${path}/`;
} else {
return path;
}
}
const getPublicUrl = appPackageJson =>
envPublicUrl || require(appPackageJson).homepage;
// We use `PUBLIC_URL` environment variable or "homepage" field to infer
// "public path" at which the app is served.
// Webpack needs to know it to put the right <script> hrefs into HTML even in
// single-page apps that may serve index.html for nested URLs like /todos/42.
// We can't use a relative path in HTML because we don't want to load something
// like /todos/42/static/js/bundle.7289d.js. We have to know the root.
function getServedPath(appPackageJson) {
const publicUrl = getPublicUrl(appPackageJson);
const servedUrl =
envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : "/");
return ensureSlash(servedUrl, true);
}
// config after eject: we're in ./config/
module.exports = {
dotenv: resolveApp(".env"),
appPath: resolveApp("."),
appBuild: resolveApp("build"),
appPublic: resolveApp("public"),
appHtml: resolveApp("public/index.html"),
appIndexJs: resolveApp("src/index.js"),
appPackageJson: resolveApp("package.json"),
appSrc: resolveApp("src"),
yarnLockFile: resolveApp("yarn.lock"),
testsSetup: resolveApp("src/setupTests.js"),
appNodeModules: resolveApp("node_modules"),
publicUrl: getPublicUrl(resolveApp("package.json")),
servedPath: getServedPath(resolveApp("package.json"))
};
module.exports.lernaRoot = path
.resolve(resolveApp("."), "../")
.endsWith("packages")
? path.resolve(resolveApp("."), "../../")
: resolveApp(".");
module.exports.appLernaModules = [];
module.exports.appLernaNodeModules = path.join(
module.exports.lernaRoot,
"node_modules"
);
fs.readdirSync(module.exports.appLernaNodeModules).forEach(folderName => {
if (folderName === "react-scripts") return;
if (folderName.substr(0, 1) === ".") return;
let fullName = path.join(module.exports.appLernaNodeModules, folderName);
if (folderName.substr(0, 1) === "#" && fs.lstatSync(fullName).isDirectory()) {
fs.readdirSync(fullName).forEach(subFolderName => {
let subFullName = path.join(fullName, subFolderName);
if (fs.lstatSync(subFullName).isSymbolicLink()) {
let src = fs.realpathSync(subFullName);
module.exports.appLernaModules.push(src);
}
});
}
if (fs.lstatSync(fullName).isSymbolicLink()) {
module.exports.appLernaModules.push(fs.realpathSync(fullName));
}
});
And changed the create-react-app original webpack.config.dev to:
"use strict";
const autoprefixer = require("autoprefixer");
const path = require("path");
const webpack = require("webpack");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CaseSensitivePathsPlugin = require("case-sensitive-paths-webpack-plugin");
const InterpolateHtmlPlugin = require("react-dev-utils/InterpolateHtmlPlugin");
const WatchMissingNodeModulesPlugin = require("react-dev-utils/WatchMissingNodeModulesPlugin");
const eslintFormatter = require("react-dev-utils/eslintFormatter");
const ModuleScopePlugin = require("react-dev-utils/ModuleScopePlugin");
const getClientEnvironment = require("./env");
const paths = require("./paths");
// Webpack uses `publicPath` to determine where the app is being served from.
// In development, we always serve from the root. This makes config easier.
const publicPath = "/";
// `publicUrl` is just like `publicPath`, but we will provide it to our app
// as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
// Omit trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
const publicUrl = "";
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl);
// Options for PostCSS as we reference these options twice
// Adds vendor prefixing based on your specified browser support in
// package.json
const postCSSLoaderOptions = {
// Necessary for external CSS imports to work
// https://github.com/facebookincubator/create-react-app/issues/2677
ident: "postcss",
plugins: () => [
require("postcss-flexbugs-fixes"),
autoprefixer({
flexbox: "no-2009"
})
]
};
console.log(paths.appLernaModules.concat(paths.appSrc));
// This is the development configuration.
// It is focused on developer experience and fast rebuilds.
// The production configuration is different and lives in a separate file.
module.exports = {
// You may want 'eval' instead if you prefer to see the compiled output in DevTools.
// See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
devtool: "cheap-module-source-map",
// These are the "entry points" to our application.
// This means they will be the "root" imports that are included in JS bundle.
// The first two entry points enable "hot" CSS and auto-refreshes for JS.
entry: [
// We ship a few polyfills by default:
require.resolve("./polyfills"),
// Include an alternative client for WebpackDevServer. A client's job is to
// connect to WebpackDevServer by a socket and get notified about changes.
// When you save a file, the client will either apply hot updates (in case
// of CSS changes), or refresh the page (in case of JS changes). When you
// make a syntax error, this client will display a syntax error overlay.
// Note: instead of the default WebpackDevServer client, we use a custom one
// to bring better experience for Create React App users. You can replace
// the line below with these two lines if you prefer the stock client:
// require.resolve('webpack-dev-server/client') + '?/',
// require.resolve('webpack/hot/dev-server'),
require.resolve("react-dev-utils/webpackHotDevClient"),
// Finally, this is your app's code:
paths.appIndexJs
// We include the app code last so that if there is a runtime error during
// initialization, it doesn't blow up the WebpackDevServer client, and
// changing JS code would still trigger a refresh.
],
output: {
// Add /* filename */ comments to generated require()s in the output.
pathinfo: true,
// This does not produce a real file. It's just the virtual path that is
// served by WebpackDevServer in development. This is the JS bundle
// containing code from all our entry points, and the Webpack runtime.
filename: "static/js/bundle.js",
// There are also additional JS chunk files if you use code splitting.
chunkFilename: "static/js/[name].chunk.js",
// This is the URL that app is served from. We use "/" in development.
publicPath: publicPath,
// Point sourcemap entries to original disk location (format as URL on Windows)
devtoolModuleFilenameTemplate: info =>
path.resolve(info.absoluteResourcePath).replace(/\\/g, "/")
},
resolve: {
// This allows you to set a fallback for where Webpack should look for modules.
// We placed these paths second because we want `node_modules` to "win"
// if there are any conflicts. This matches Node resolution mechanism.
// https://github.com/facebookincubator/create-react-app/issues/253
modules: ["node_modules", paths.appNodeModules].concat(
// It is guaranteed to exist because we tweak it in `env.js`
process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
),
// These are the reasonable defaults supported by the Node ecosystem.
// We also include JSX as a common component filename extension to support
// some tools, although we do not recommend using it, see:
// https://github.com/facebookincubator/create-react-app/issues/290
// `web` extension prefixes have been added for better support
// for React Native Web.
extensions: [".web.js", ".mjs", ".js", ".json", ".web.jsx", ".jsx"],
alias: {
// Support React Native Web
// https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
"react-native": "react-native-web"
},
plugins: [
// Prevents users from importing files from outside of src/ (or node_modules/).
// This often causes confusion because we only process files within src/ with babel.
// To fix this, we prevent you from importing files out of src/ -- if you'd like to,
// please link the files into your node_modules/ and let module-resolution kick in.
// Make sure your source files are compiled, as they will not be processed in any way.
new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson])
]
},
module: {
strictExportPresence: true,
rules: [
// Disable require.ensure as it's not a standard language feature.
{ parser: { requireEnsure: false } },
// First, run the linter.
// It's important to do this before Babel processes the JS.
{
test: /\.(js|jsx|mjs)$/,
enforce: "pre",
use: [
{
options: {
formatter: eslintFormatter,
eslintPath: require.resolve("eslint")
},
loader: require.resolve("eslint-loader")
}
],
include: paths.appLernaModules.concat(paths.appSrc)
},
{
// "oneOf" will traverse all following loaders until one will
// match the requirements. When no loader matches it will fall
// back to the "file" loader at the end of the loader list.
oneOf: [
// "url" loader works like "file" loader except that it embeds assets
// smaller than specified limit in bytes as data URLs to avoid requests.
// A missing `test` is equivalent to a match.
{
test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
loader: require.resolve("url-loader"),
options: {
limit: 10000,
name: "static/media/[name].[hash:8].[ext]"
}
},
// Process application JS with Babel.
// The preset includes JSX, Flow, and some ESnext features.
{
test: /\.(js|jsx|mjs)$/,
include: paths.appLernaModules.concat(paths.appSrc),
use: [
// This loader parallelizes code compilation, it is optional but
// improves compile time on larger projects
require.resolve("thread-loader"),
{
loader: require.resolve("babel-loader"),
options: {
// This is a feature of `babel-loader` for webpack (not Babel itself).
// It enables caching results in ./node_modules/.cache/babel-loader/
// directory for faster rebuilds.
cacheDirectory: true,
highlightCode: true
}
}
]
},
// Process any JS outside of the app with Babel.
// Unlike the application JS, we only compile the standard ES features.
{
test: /\.js$/,
use: [
// This loader parallelizes code compilation, it is optional but
// improves compile time on larger projects
require.resolve("thread-loader"),
{
loader: require.resolve("babel-loader"),
options: {
babelrc: false,
compact: false,
presets: [
require.resolve("babel-preset-react-app/dependencies")
],
cacheDirectory: true,
highlightCode: true
}
}
]
},
// "postcss" loader applies autoprefixer to our CSS.
// "css" loader resolves paths in CSS and adds assets as dependencies.
// "style" loader turns CSS into JS modules that inject <style> tags.
// In production, we use a plugin to extract that CSS to a file, but
// in development "style" loader enables hot editing of CSS.
// By default we support CSS Modules with the extension .module.css
{
test: /\.css$/,
exclude: /\.module\.css$/,
use: [
require.resolve("style-loader"),
{
loader: require.resolve("css-loader"),
options: {
importLoaders: 1
}
},
{
loader: require.resolve("postcss-loader"),
options: postCSSLoaderOptions
}
]
},
// Adds support for CSS Modules (https://github.com/css-modules/css-modules)
// using the extension .module.css
{
test: /\.module\.css$/,
use: [
require.resolve("style-loader"),
{
loader: require.resolve("css-loader"),
options: {
importLoaders: 1,
modules: true,
localIdentName: "[path]__[name]___[local]"
}
},
{
loader: require.resolve("postcss-loader"),
options: postCSSLoaderOptions
}
]
},
// Allows you to use two kinds of imports for SVG:
// import logoUrl from './logo.svg'; gives you the URL.
// import { ReactComponent as Logo } from './logo.svg'; gives you a component.
{
test: /\.svg$/,
use: [
{
loader: require.resolve("babel-loader"),
options: {
cacheDirectory: true
}
},
require.resolve("svgr/webpack"),
{
loader: require.resolve("file-loader"),
options: {
name: "static/media/[name].[hash:8].[ext]"
}
}
]
},
// "file" loader makes sure those assets get served by WebpackDevServer.
// When you `import` an asset, you get its (virtual) filename.
// In production, they would get copied to the `build` folder.
// This loader doesn't use a "test" so it will catch all modules
// that fall through the other loaders.
{
// Exclude `js` files to keep "css" loader working as it injects
// its runtime that would otherwise be processed through "file" loader.
// Also exclude `html` and `json` extensions so they get processed
// by webpacks internal loaders.
exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/],
loader: require.resolve("file-loader"),
options: {
name: "static/media/[name].[hash:8].[ext]"
}
}
]
}
// ** STOP ** Are you adding a new loader?
// Make sure to add the new loader(s) before the "file" loader.
]
},
plugins: [
// Makes some environment variables available in index.html.
// The public URL is available as %PUBLIC_URL% in index.html, e.g.:
// <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
// In development, this will be an empty string.
new InterpolateHtmlPlugin(env.raw),
// Generates an `index.html` file with the <script> injected.
new HtmlWebpackPlugin({
inject: true,
template: paths.appHtml
}),
// Add module names to factory functions so they appear in browser profiler.
new webpack.NamedModulesPlugin(),
// Makes some environment variables available to the JS code, for example:
// if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
new webpack.DefinePlugin(env.stringified),
// This is necessary to emit hot updates (currently CSS only):
new webpack.HotModuleReplacementPlugin(),
// Watcher doesn't work well if you mistype casing in a path so we use
// a plugin that prints an error when you attempt to do this.
// See https://github.com/facebookincubator/create-react-app/issues/240
new CaseSensitivePathsPlugin(),
// If you require a missing module and then `npm install` it, you still have
// to restart the development server for Webpack to discover it. This plugin
// makes the discovery automatic so you don't have to restart.
// See https://github.com/facebookincubator/create-react-app/issues/186
new WatchMissingNodeModulesPlugin(paths.appNodeModules),
// Moment.js is an extremely popular library that bundles large locale files
// by default due to how Webpack interprets its code. This is a practical
// solution that requires the user to opt into importing specific locales.
// https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
// You can remove this if you don't use Moment.js:
new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
],
// Some libraries import Node modules but don't use them in the browser.
// Tell Webpack to provide empty mocks for them so importing them works.
node: {
dgram: "empty",
fs: "empty",
net: "empty",
tls: "empty",
child_process: "empty"
},
// Turn off performance hints during development because we don't do any
// splitting or minification in interest of speed. These warnings become
// cumbersome.
performance: {
hints: false
}
};
OBS: Repair the console.log() command in the code above to show what is being loaded.
Running, I´m getting the following result:
$ npm start
> #myorganization/auth#3.0.0 start D:\project\packages\auth
> node scripts/start.js
[ 'D:\\project\\packages\\auth',
'D:\\project\\packages\\ux',
'D:\\project\\packages\\auth\\src' ]
Starting the development server...
Failed to compile.
../ux/src/atoms/index.js
Module build failed: Error: No ESLint configuration found.
Commenting the eslint step in webpack.config.dev, I´m getting:
$ npm start
> #myorganization/auth#3.0.0 start D:\project\packages\auth
> node scripts/start.js
[ 'D:\\project\\packages\\auth',
'D:\\project\\packages\\ux',
'D:\\project\\packages\\auth\\src' ]
Starting the development server...
Failed to compile.
../ux/src/atoms/ActivityItem/ActivityItem.js
Syntax error: D:\project\packages\ux\src\atoms\ActivityItem\ActivityItem.js: Support for the experimental syntax 'classProperties' isn't currently enabled (34:20):
32 | class ActivityItem extends Component {
33 |
> 34 | static propTypes = {
| ^
35 | showHeader: PropTypes.bool,
36 | timestamp: PropTypes.number,
37 | username: PropTypes.string,
Add #babel/plugin-proposal-class-properties (https://git.io/vb4SL) to the 'plugins' section of your Babel config to enable transformation.
In short, the shared code is not being either transpiled or linted, and that breaks the whole project. The whole project was done using ES6.
As of react-scripts 2.0 they removed support for monorepos (https://github.com/facebook/create-react-app/issues/1333). However if you scroll to the bottom of the issues page you will see a link to react-workspaces. I've not tried it, but it looks promising. (https://github.com/react-workspaces/react-workspaces-playground)
Currently working on an SPA that is used to submit user information to a SQL database via an odbc INSERT statement, but my local environment is not being properly constructed and I cant figure out why.
Link to npm's binding: https://www.npmjs.com/package/bindings
macOS
version 10.12.6
node -v
v8.8.1
webpack -v
3.8.1
As of right now, I can use node post.js to successfully make a post to my database. However, when I run grunt build I receive the following errors:
WARNING in ./node_modules/bindings/bindings.js
81:22-40 Critical dependency: the request of a dependency is an expression
WARNING in ./node_modules/bindings/bindings.js
81:43-53 Critical dependency: the request of a dependency is an expression
ERROR in ./node_modules/bindings/bindings.js
Module not found: Error: Can't resolve 'fs' in '/Users/pat/to/project/node_modules/bindings'
# ./node_modules/bindings/bindings.js 6:11-24
# ./node_modules/odbc/lib/odbc.js
# ./assets/scripts/index.js
# ./index.js
Warning: Use --force to continue.
Aborted due to warnings.
Note: I receive the same issue whenever I require fs in any file (the same error occurs for whichever file I require fs in). The require of fs in binding.js is the last instance of the problem because when I remove it from binding.js the code breaks.
So when I take a look at the binding.js file that is being mentioned above, we can see the following (the require(fs) is the important line to look at):
/**
* Module dependencies.
*/
var fs = require('fs')
, path = require('path')
, join = path.join
, dirname = path.dirname
, exists = ((fs.accessSync && function (path) { try { fs.accessSync(path); } catch (e) { return false; } return true; })
|| fs.existsSync || path.existsSync)
, defaults = {
arrow: process.env.NODE_BINDINGS_ARROW || ' → '
, compiled: process.env.NODE_BINDINGS_COMPILED_DIR || 'compiled'
, platform: process.platform
, arch: process.arch
, version: process.versions.node
, bindings: 'bindings.node'
, try: [
// node-gyp's linked version in the "build" dir
[ 'module_root', 'build', 'bindings' ]
// node-waf and gyp_addon (a.k.a node-gyp)
, [ 'module_root', 'build', 'Debug', 'bindings' ]
, [ 'module_root', 'build', 'Release', 'bindings' ]
// Debug files, for development (legacy behavior, remove for node v0.9)
, [ 'module_root', 'out', 'Debug', 'bindings' ]
, [ 'module_root', 'Debug', 'bindings' ]
// Release files, but manually compiled (legacy behavior, remove for node v0.9)
, [ 'module_root', 'out', 'Release', 'bindings' ]
, [ 'module_root', 'Release', 'bindings' ]
// Legacy from node-waf, node <= 0.4.x
, [ 'module_root', 'build', 'default', 'bindings' ]
// Production "Release" buildtype binary (meh...)
, [ 'module_root', 'compiled', 'version', 'platform', 'arch', 'bindings' ]
]
}
/**
* The main `bindings()` function loads the compiled bindings for a given module.
* It uses V8's Error API to determine the parent filename that this function is
* being invoked from, which is then used to find the root directory.
*/
function bindings (opts) {
// Argument surgery
if (typeof opts == 'string') {
opts = { bindings: opts }
} else if (!opts) {
opts = {}
}
// maps `defaults` onto `opts` object
Object.keys(defaults).map(function(i) {
if (!(i in opts)) opts[i] = defaults[i];
});
// Get the module root
if (!opts.module_root) {
opts.module_root = exports.getRoot(exports.getFileName())
}
// Ensure the given bindings name ends with .node
if (path.extname(opts.bindings) != '.node') {
opts.bindings += '.node'
}
var tries = []
, i = 0
, l = opts.try.length
, n
, b
, err
for (; i<l; i++) {
n = join.apply(null, opts.try[i].map(function (p) {
return opts[p] || p
}))
tries.push(n)
try {
b = opts.path ? require.resolve(n) : require(n)
if (!opts.path) {
b.path = n
}
return b
} catch (e) {
if (!/not find/i.test(e.message)) {
throw e
}
}
}
err = new Error('Could not locate the bindings file. Tried:\n'
+ tries.map(function (a) { return opts.arrow + a }).join('\n'))
err.tries = tries
throw err
}
module.exports = exports = bindings
/**
* Gets the filename of the JavaScript file that invokes this function.
* Used to help find the root directory of a module.
* Optionally accepts an filename argument to skip when searching for the invoking filename
*/
exports.getFileName = function getFileName (calling_file) {
var origPST = Error.prepareStackTrace
, origSTL = Error.stackTraceLimit
, dummy = {}
, fileName
Error.stackTraceLimit = 10
Error.prepareStackTrace = function (e, st) {
for (var i=0, l=st.length; i<l; i++) {
fileName = st[i].getFileName()
if (fileName !== __filename) {
if (calling_file) {
if (fileName !== calling_file) {
return
}
} else {
return
}
}
}
}
// run the 'prepareStackTrace' function above
Error.captureStackTrace(dummy)
dummy.stack
// cleanup
Error.prepareStackTrace = origPST
Error.stackTraceLimit = origSTL
return fileName
}
/**
* Gets the root directory of a module, given an arbitrary filename
* somewhere in the module tree. The "root directory" is the directory
* containing the `package.json` file.
*
* In: /home/nate/node-native-module/lib/index.js
* Out: /home/nate/node-native-module
*/
exports.getRoot = function getRoot (file) {
var dir = dirname(file)
, prev
while (true) {
if (dir === '.') {
// Avoids an infinite loop in rare cases, like the REPL
dir = process.cwd()
}
if (exists(join(dir, 'package.json')) || exists(join(dir, 'node_modules'))) {
// Found the 'package.json' file or 'node_modules' dir; we're done
return dir
}
if (prev === dir) {
// Got to the top
throw new Error('Could not find module root given file: "' + file
+ '". Do you have a `package.json` file? ')
}
// Try the parent dir next
prev = dir
dir = join(dir, '..')
}
}
So it appears that requiring fs in the at the top of the code block is causing the issue. If I remove the fs require and run grunt build again, I get the following warnings but no errors:
WARNING in ./node_modules/bindings/bindings.js
81:22-40 Critical dependency: the request of a dependency is an expression
WARNING in ./node_modules/bindings/bindings.js
81:43-53 Critical dependency: the request of a dependency is an expression
I receive the same warnings when running 'grunt serve' but no error. Then when I visit the page on localhost, I'm receiving the following error:
bindings.js:10 Uncaught ReferenceError: fs is not defined
at Object.<anonymous> (bindings.js:10)
at Object.Array.concat.splitPathRe (bindings.js:171)
at __webpack_require__ (bootstrap 2037e18d07470b1345e0:54)
at Object.<anonymous> (odbc.js:18)
at Object.Array.concat.webpackEmptyContext.keys (odbc.js:820)
at __webpack_require__ (bootstrap 2037e18d07470b1345e0:54)
at Object.<anonymous> (index.js:7)
at Object.<anonymous> (application.js:984)
at __webpack_require__ (bootstrap 2037e18d07470b1345e0:54)
at Object.<anonymous> (index.js:8)
So removing the fs require is allowing me to build, but then binding.js is not functioning properly because I removed the fs require. In addition, after removing the fs require in binding.js, I cannot use node to make posts to the database because I removed the fs require in binding.js (receive the error message above).
I've tried debugging by adding the following code to my 'grunt/webpack.js' file as suggested in several posts:
target: 'node',
node: {
fs: 'empty'
}
Link to post that advice is from: https://github.com/webpack-contrib/css-loader/issues/447
Here is my whole 'grunt/webpack.js' file (want to ensure I placed it in the correct location):
'use strict'
const webpack = require('webpack')
const path = require('path')
module.exports = {
options: {
entry: {
application: './index.js',
specs: './spec/_all.js',
vendor: ['jquery', 'bootstrap-sass']
},
output: {
filename: '[name].js',
path: path.join(__dirname, '/../public'),
publicPath: 'public/'
},
plugins: [
new webpack.optimize.CommonsChunkPlugin({
name: 'vendor',
minChunks: Infinity
}),
new webpack.ProvidePlugin({
$: 'jquery',
jQuery: 'jquery',
'window.jQuery': 'jquery'
})
],
module: {
rules: [
{
test: /\.js$/,
exclude: /(node_modules|bower_components)/,
loader: 'babel-loader',
query: {
presets: ['es2015']
}
},
{
test: /\.css$/,
use: [
{ loader: 'style-loader' },
{ loader: 'css-loader' }
]
},
{
test: /\.scss$/,
use: [
{ loader: 'style-loader' },
{ loader: 'css-loader' },
{
loader: 'sass-loader',
options: {
includePaths: [
path.resolve(__dirname, './node_modules')
]
}
}
]
},
{
test: /\.woff[\d]?(\?v=[0-9]\.[0-9]\.[0-9])?$/,
loader: 'url-loader?limit=10000&mimetype=application/font-woff'
},
{
test: /\.(ttf|eot|svg|png|jpg|gif)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
loader: 'file-loader'
},
{
test: /\.(hbs|handlebars)$/,
loader: 'handlebars-loader',
query: {
helperDirs: [
path.join(__dirname, '/../assets/scripts/templates/helpers')
]
}
}
]
},
resolve: {
alias: {
handlebars: 'handlebars/dist/handlebars.js'
}
},
stats: {
colors: true,
modules: true,
reasons: true
}
},
target: 'node',
node: {
fs: 'empty',
console: 'empty',
net: 'empty',
tls: 'empty'
},
build: {
failOnError: true,
watch: false,
keepalive: false
}
}
Here is my package.json as reference for all other relevant installs:
{
"name": "omnipodeurope",
"version": "0.0.3",
"private": true,
"license": {
"software": "GNU GPLv3",
"content": "CCBYNCSA 4.0"
},
"dependencies": {
"bindings": "^1.3.0",
"fs": "0.0.1-security",
"jquery": "^3.2.1",
"odbc": "^1.3.0",
"videojs": "^1.0.0"
},
"devDependencies": {
"babel-core": "^6.25.0",
"babel-loader": "^7.1.1",
"babel-preset-es2015": "^6.24.1",
"bootstrap-sass": "^3.3.7",
"chai": "^4.1.1",
"clone": "^2.1.1",
"css-loader": "^0.27.0",
"eslint": "^4.4.1",
"eslint-config-standard": "^10.2.1",
"eslint-plugin-import": "^2.7.0",
"eslint-plugin-node": "^5.1.1",
"eslint-plugin-promise": "^3.5.0",
"eslint-plugin-standard": "^3.0.1",
"expose-loader": "^0.7.3",
"file-loader": "^1.0.0",
"grunt": "^1.0.1",
"grunt-concurrent": "^2.3.1",
"grunt-eslint": "^20.0.0",
"grunt-jsonlint": "^1.1.0",
"grunt-mocha-phantomjs": "^4.0.0",
"grunt-nodemon": "^0.4.2",
"grunt-open": "^0.2.3",
"grunt-sass-lint": "^0.2.2",
"grunt-shell": "^2.1.0",
"grunt-webpack": "^3.0.2",
"handlebars": "^4.0.10",
"handlebars-loader": "^1.5.0",
"html-loader": "^0.5.1",
"load-grunt-config": "^0.19.2",
"mocha": "^3.5.0",
"node-libs-browser": "^2.0.0",
"node-sass": "^4.5.3",
"sass-loader": "^6.0.6",
"style-loader": "^0.18.2",
"time-grunt": "^1.4.0",
"url-loader": "^0.5.9",
"webpack": "^3.5.1",
"webpack-dev-server": "^2.7.1"
}
}
Any help would be appreciated. Please let me know if I should post any additional information that might be relevant.
Thanks all!
#
UPDATE:
I've modified binding.js so that it is in its original form, and added the following to my grunt/webpack.js file as I mentioned above:
target: 'node',
node: {
fs: 'empty'
}
And now, I'm seeing the following in the DOM in my browser: So it looks like webpack is attemtpting to set fs as its own variable, but for some reason it cannot locate the correct module. What
var fs = __webpack_require__(!(function webpackMissingModule() { var e = new Error("Cannot find module \"fs\""); e.code = 'MODULE_NOT_FOUND'; throw e; }()))
, path = __webpack_require__(20)
What would cause webpack to be unable to find the fs module? Could it be because I have multiple fs-related packages? (fs and node-fs);
I am trying to inject the NODE_ENV value into my code using webpack via DefinePlugin. I checked, more or less, an identical question, but still can't get it to work.
Specifically, here's my setup.
In package.json:
"scripts": {
"build": "rimraf dist && cross-env NODE_ENV=production webpack",
"dev": "cross-env NODE_ENV=development && node webpack-dev-server.js"
},
In webpack.config.js:
"use strict";
/* requiring the modules */
const webpack = require("webpack");
const path = require("path");
/* defining the source and distribution paths */
const DIST_DIR = path.resolve(__dirname, "dist");
const SRC_DIR = path.resolve(__dirname, "src");
const DEVELOPMENT = process.env.NODE_ENV === "development";
const PRODUCTION = process.env.NODE_ENV === "production";
// const PRODUCTION = !!process.argv.find((element) => element === '--production');
// const DEVELOPMENT = !!process.argv.find((element) => element === '--development');
/* defining the entries*/
const productionEntries = {
home: SRC_DIR + "/_home.js",
about: SRC_DIR + "/_about.js",
};
const developmentEntries = Object.assign({}, productionEntries, {webpackDevServer: ["webpack/hot/dev-server", "webpack-dev-server/client?http://localhost:8080"]});
const entries = PRODUCTION ? productionEntries : developmentEntries;
/* defining the output */
const output = {
filename: "[name].js",
path: DIST_DIR,
publicPath: "/dist/",
pathinfo: true,
library: "MyLibraryName"
};
/* defining the plugins */
const plugins = PRODUCTION
? [
new webpack.optimize.OccurrenceOrderPlugin(),
new webpack.optimize.AggressiveMergingPlugin(),
new webpack.optimize.UglifyJsPlugin({comments: false}),
]
: [
new webpack.HotModuleReplacementPlugin(),
];
plugins.push(
new webpack.optimize.CommonsChunkPlugin({name: "vendor.bundle", minChunks: 2}),
new webpack.DefinePlugin({
PRODUCTION: PRODUCTION,
DEVELOPMENT: DEVELOPMENT,
})
);
/* defining the modules -> rules -> loaders */
const modules = {
rules:
[
{
test: /\.(js|jsx)$/,
include: SRC_DIR,
exclude: /node_modules/,
loader: "babel-loader",
options:
{
presets: ["react", ["es2015", {modules: false}], "stage-2"]
}
}
]
};
/* building the webpack config object */
const config = {
entry: entries,
output: output,
module: modules,
plugins: plugins,
devtool: "source-map",
target: "web",
stats: "verbose"
};
/* exporting the webpack config */
module.exports = config;
And, finally, in _about.js I have the following:
// output after using: npm run dev
console.log(process.env.NODE_ENV); // prints undefined
console.log(PRODUCTION); // prints false
console.log(DEVELOPMENT); // prints false
if (module.hot) {
module.hot.accept();
}
The problem:
since npm run dev runs successfully (i.e., the server starts and the plugins and entries are adequtlly selected), I don't understand why the output for console.log(DEVELOPMENT) is false, and why console.log(process.env.NODE_ENV) prints undefined.
in the conditional checks performed inside the webpack.config.js, the NODE_ENV value is picked properly, otherwise the the plugins, entries, and the development server wouldn't work. However, I can't pass that value down to _about.js using DefinePlugin.
I also tried EnvironmentPlugin, same result.
My question: Can you, please, help me understand where things break?
Edit 1:
I tried the following without any improvements:
new webpack.DefinePlugin({
PRODUCTION: JSON.stringify(PRODUCTION),
DEVELOPMENT: JSON.stringify(DEVELOPMENT)
})
I am running node.js on Windows 10.
Edit 2:
Tried:
const DEVELOPMENT = process.env.NODE_ENV === "development";
const PRODUCTION = process.env.NODE_ENV === "production";
// with this inside plugins:
new webpack.DefinePlugin({
"process.env.PRODUCTION": JSON.stringify(PRODUCTION),
"process.env.DEVELOPMENT": JSON.stringify(DEVELOPMENT)
})
and (using npm run dev) I get the following output:
console.log(process.env.PRODUCTION); // false
console.log(process.env.DEVELOPMENT); // false
console.log(process.env.NODE_ENV); // undefined
console.log(PRODUCTION); // Uncaught ReferenceError: PRODUCTION is not defined
console.log(DEVELOPMENT); // Uncaught ReferenceError: DEVELOPMENT is not defined
No improvements unfortunately.
Edit 3:
My devDependencies are:
"devDependencies": {
"babel-core": "^6.21.0",
"babel-loader": "^6.2.10",
"babel-preset-es2015": "^6.18.0",
"babel-preset-react": "^6.16.0",
"babel-preset-stage-2": "^6.18.0",
"cross-env": "^3.1.4",
"rimraf": "^2.5.4",
"webpack": "^2.2.0-rc.4",
"webpack-dev-server": "^2.2.0-rc.0"
}
Edit 4: (solved)
#Cleiton spotted the issue. It had to do with the how the npm scripts are constructed using cross-env. See the complete answer below.
The problem is because you are using cross-env in a wrong way. It only changes env variables for its context, so when you use '&&' to run webpack it is already gone and webpack see nothing.
So you MUST write
"scripts": {
"build": "rimraf dist && cross-env NODE_ENV=production webpack",
"dev": "cross-env NODE_ENV=development node webpack-dev-server.js"
},
note that you have wrote right for "build" script.
Another question is about that If you want do references to "process.env.PRODUCTION" inside your code base you should write:
new webpack.DefinePlugin({
"process.env.PRODUCTION": JSON.stringify(PRODUCTION),
"proccess.env.DEVELOPMENT": JSON.stringify(DEVELOPMENT),
});
The DefinePlugin expects strings so you need to JSON.stringify() any values passed into it.
new webpack.DefinePlugin({
PRODUCTION: JSON.stringify(PRODUCTION),
DEVELOPMENT: JSON.stringify(DEVELOPMENT)
})