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Error: Caching was left unconfigured. Babel's plugins when I installed Font Awesome to my react app

I would like to use Font Awesome in my React app, but when I have install npm of Font Awesome I had this error:
Error: Caching was left unconfigured. Babel's plugins, presets, and .babelrc.js files can be configured
for various types of caching, using the first param of their handler functions:
module.exports = function(api) {
// The API exposes the following:
// Cache the returned value forever and don't call this function again.
api.cache(true);
// Don't cache at all. Not recommended because it will be very slow.
api.cache(false);
// Cached based on the value of some function. If this function returns a value different from
// a previously-encountered value, the plugins will re-evaluate.
var env = api.cache(() => process.env.NODE_ENV);
// If testing for a specific env, we recommend specifics to avoid instantiating a plugin for
// any possible NODE_ENV value that might come up during plugin execution.
var isProd = api.cache(() => process.env.NODE_ENV === "production");
// .cache(fn) will perform a linear search though instances to find the matching plugin based
// based on previous instantiated plugins. If you want to recreate the plugin and discard the
// previous instance whenever something changes, you may use:
var isProd = api.cache.invalidate(() => process.env.NODE_ENV === "production");
// Note, we also expose the following more-verbose versions of the above examples:
api.cache.forever(); // api.cache(true)
api.cache.never(); // api.cache(false)
api.cache.using(fn); // api.cache(fn)
// Return the value that will be cached.
return { };
};
and this is my dev dependencies:
"devDependencies": {
"#babel/core": "^7.17.5",
"#babel/preset-env": "^7.16.11",
"babel-loader": "^8.2.3",
"webpack": "^5.70.0"
}
I have created 2 new files like in tutorial
babel.config.js:
module.exports = function (api) {
return {
plugins: ['macros'],
}
}
and babel-plugin-macros.config.js:
module.exports = {
'fontawesome-svg-core': {
'license': 'free'
}
}
but I have still this bug

For fix this bug I chenged a litte babel.config.js:
module.exports = function (api) {
api.cache(true);
return {
plugins: ['macros'],
}
}

The easiest way for me is to change the format of my babel config from babel.config.js to .babelrc. After that I didn't see any of that kind of error.
Go here for more explanation.

Press F1
Go to settings.json
Set "json.schemaDownload.enable": true
Reload VSCode

Vue: How to build bundle for Nuxt with vue-cli-service?

A user tries to use my package for nuxt.js, but gets the error: document is not defined.
I found the first issue. When I build the bundle with "build-bundle": "vue-cli-service build --target lib --name index ./src/index.js",
vue-style-loader is being used. This, however, results in the error for using nuxt projects. This part is failing:
function addStyle (obj /* StyleObjectPart */) {
var update, remove
var styleElement = document.querySelector('style[' + ssrIdKey + '~="' + obj.id + '"]')
Document is not defined since we are using server rendering. But the question is how can I build up my package so that I can use it with nuxt?
I need:
index.common.js
index.umd.js
index.umd.min.js

This is due to the server-side rendering. If you need to specify that you want to import a resource only on the client-side, you need to use the process.client variable.
For example, in your .vue file:
if (process.client) {
require('external_library')
// do something
}
The above is the fundamental solution to document is not defined.
I checked some information and found that, this problem is not caused by your package. In fact, the problem lies on the cache-loader package in the user’s nuxt project.
For some reason cache-loader incorrectly determined the current environment as browser and not node so that vue-style-loader is confused and used client implementation instead.
So try to let users add the following configuration to the nuxt.config.js file to disable stylesheet caches on server-side:
build: {
...
cache: true,
extend(config, { isServer, isDev, isClient }) {
...
if (isServer) {
for (const rules of config.module.rules.filter(({ test }) =>
/\.((c|le|sa|sc)ss|styl.*)/.test(test.toString())
)) {
for (const rule of rules.oneOf || []) {
rule.use = rule.use.filter(
({ loader }) => loader !== 'cache-loader'
)
}
}
}
...
}
...
}

I found a solution but it is not using the vue-cli service. Instead, the files are compiled by rollup. I found using the cli service much easier. The only problem with the cli service is it will adjust the "flow" of your repo. However, you can modify the rollup.config.js to amend the folder structure.
The problem with rollup is that it isn't webpack. Therefore, all components using a webpack configuration need to be adjusted or rollup.config.js needs to be amended to include the additional functionality

How to include manual import() in Webpack Bundle

I am quite new to Webpack, so bear with me if thats a stupid question.
My goal is to transform my old, AMD based codebase to a ES6 Module based solution. What I am struggling with is handling dynamic import()s. So my app router works on a module basis, i.e. each route is mapped to a module path and then required. Since I know what modules will be included, I just add those dynamically imported modules to my r.js configuration and am able to build everything in a single file, with all require calls still working.
Now, I am trying to do the same with ES6 modules and Webpack. With my devmode this is no problem as I can just replace require() with import(). However I cannot get this to work with bundling. Either Webpack splits my code (and still fails to load the dynamic module anyways), or - if I use the Array format for the entry config, the dynamic module is included in the bundle but loading still fails: Error: Cannot find module '/src/app/DynClass.js'
This is how my Webpack config looks like:
const webpack = require('webpack');
const path = require('path');
module.exports = {
mode: "development",
entry: ['./main.js', './app/DynClass.js'],
output: {
filename: 'main.js',
path: path.resolve(__dirname, "../client/")
},
resolve: {
alias: {
"/src": path.resolve(__dirname, '')
}
},
module: {
rules: [
{
test: /\.tpl$/i,
use: 'raw-loader',
},
]
}
};
So basically I want to tell Webpack: "hey, there is another module (or more) that is to be loaded dynamically and I want it to be included in the bundle"
How can I do this?

So yeah, after much fiddling there seems to be a light at the end of the tunnel. Still, this is not a 100% solution and it is surely not for the faint of heart, as it is quite ugly and fragile. But still I want to share my approach with you:
1) manual parsing of my routes config
My router uses a config file looking like this:
import StaticClass from "/src/app/StaticClass.js";
export default {
StaticClass: {
match: /^\//,
module: StaticClass
},
DynClass: {
match: /^\//,
module: "/src/app/DynClass.js"
}
};
So as you can see the export is an object, with keys acting as the route id, and an object that contains the matches (regex based) and the module which should be executed by the router if the route matches. I can feed my router with both a Constructor function (or an object) for modules which are available immediatly (i.e. contained in the main chunk) or if the module value is a string, this means that the router has to load this module dynamically by using the path specified in the string.
So as I know what modules could be potentially loaded (but not if and when) I can now parse this file within my build process and transform the route config to something webpack can understand:
const path = require("path");
const fs = require("fs");
let routesSource = fs.readFileSync(path.resolve(__dirname, "app/routes.js"), "utf8");
routesSource = routesSource.substr(routesSource.indexOf("export default"));
routesSource = routesSource.replace(/module:\s*((?!".*").)*$/gm, "module: undefined,");
routesSource = routesSource.replace(/\r?\n|\r/g, "").replace("export default", "var routes = ");
eval(routesSource);
let dummySource = Object.entries(routes).reduce((acc, [routeName, routeConfig]) => {
if (typeof routeConfig.module === "string") {
return acc + `import(/* webpackChunkName: "${routeName}" */"${routeConfig.module}");`;
}
return acc;
}, "") + "export default ''";
(Yeah I know this is quite ugly and also a bit brittle so this surely could be done better)
Essentially I create a new, virtual module where every route entry which demands a dynamic import is translated, so:
DynClass: {
match: /^\//,
module: "/src/app/DynClass.js"
}
becomes:
import(/* webpackChunkName: "DynClass" */"/src/app/DynClass.js");
So the route id simply becomes the name of the chunk!
2) including the virtual module in the build
For this I use the virtual-module-webpack-plugin:
plugins: [
new VirtualModulePlugin({
moduleName: "./app/dummy.js",
contents: dummySource
})
],
Where dummySource is just a string containing the sourcecode of my virtual module I just have generated. Now, this module is pulled in and the "virtual imports" can be processed by webpack. But wait, I still need to import the dummy module, but I do not have any in my development mode (where I use everything natively, so no loaders).
So in my main code I do the following:
let isDev = false;
/** #remove */
isDev = true;
/** #endremove */
if (isDev) { import('./app/dummy.js'); }
Where "dummy.js" is just an empty stub module while I am in development mode. The parts between that special comments are removed while building (using the webpack-loader-clean-pragma loader), so while webpack "sees" the import for dummy.js, this code will not be executed in the build itself since then isDev evaluates to false. And since we already defined a virtual module with the same path, the virtual module is included while building just like I want, and of course all dependencies are resolved as well.
3) Handling the actual loading
For development, this is quite easy:
import routes from './app/routes.js';
Object.entries(routes).forEach(async ([routeId, route]) => {
if (typeof route.module === "function") {
new route.module;
} else {
const result = await import(route.module);
new result.default;
}
});
(Note that this is not the actual router code, just enough to help me with my PoC)
Well, but for the build I need something else, so I added some code specific to the build environment:
/** #remove */
const result = await import(route.module);
new result.default;
/** #endremove */
if (!isDev) {
if (typeof route.module === "string") { await __webpack_require__.e(routeId); }
const result = __webpack_require__(route.module.replace("/src", "."));
new result.default;
}
Now, the loading code for the dev environment is just stripped out, and there is another loading code that uses webpack internally. I also check if the module value is a function or string, and if it is the latter I invoke the internal require.ensure function to load the correct chunk: await __webpack_require__.e(routeId);. Remember that I named my chunks when generating the virtual module? Now thats why I still can find them now!
4) more needs to be done
Another thing I encountered is when several dynamically loaded modules have the same dependencies, webpack tries to generate more chunks with names like module1~module2.bundle.js, breaking my build. To counter this, I needed to make sure that all those shared modules go into a specific named bundle I called "shared":
optimization: {
splitChunks: {
chunks: "all",
name: "shared"
}
}
And when in production mode, I simply load this chunk manually before any dynamic modules depending on it are requested:
if (!isDev) {
await __webpack_require__.e("shared");
}
Again, this code only runs in production mode!
Finally, I have to prevent webpack renaming my modules (and chunks) to something like "1", "2" etc, but rather keep the names I just have defined:
optimization: {
namedChunks: true,
namedModules: true
}
Se yeah, there you have it! As I said this wasn't pretty but seems to work, at least with my simplified test setup. I really hope there aren't any blockers ahead of me when I do all the rest (like ESLint, SCSS etc)!

Vue cli 3 display info from the package.json

In a vue cli 3 project I want to display a version number in the webpage. The version number lies in the package.json file.
The only reference to this that I found is this link in the vue forum.
However, I can't get the proposed solution to work.
Things I tried
Use webpack.definePlugin as in the linked resource:
vue.config.js
const webpack = require('webpack');
module.exports = {
lintOnSave: true,
configureWebpack: config => {
return {
plugins: [
new webpack.DefinePlugin({
'process.env': {
VERSION: require('./package.json').version,
}
})
]
}
},
}
Then in main.ts I read process.env, but it does not contain VERSION (I tried several variants to this, like generating a PACKAGE_JSON field like in the linked page, and generating plain values like 'foo' instead of reading from package-json). It never worked, it is like the code is being ignored. I guess the process.env is being redefined later by vue webpack stuff.
The process log in main.ts contains, however, all the stuff that process usually contains in a vue-cli project, like the mode and the VUE_APP variables defined in .env files.
Try to write to process right on the configure webpack function,
like:
configureWebpack: config => {
process.VERSION = require('./package.json').version
},
(to be honest I did not have much hope with this, but had to try).
Tried the other solution proposed in the linked page,
like:
// vue.config.js
module.exports = {
chainWebpack: config => {
config.plugin('define').tap( ([options = {}]) => {
return [{
...options, // these are the env variables from your .env file, if any arr defined
VERSION: JSON.stringify(require('./package.json').version)
}]
})
}
}
But this fail silently too.
Use the config.plugin('define') syntax suggested by #Oluwafemi,
like:
chainWebpack: (config) => {
return config.plugin('define').tap(
args => merge(args, [VERSION])
)
},
Where VERSION is a local variable defined as:
const pkgVersion = require('./package.json').version;
const VERSION = {
'process.env': {
VUE_APP_VERSION: JSON.stringify(pkgVersion)
}
}
But this is not working either.
I am re-starting the whole project everytime, so that's not the reason why the process stuff does not show up.
My vue-cli version is 3.0.1.

I am adding my 2 cents, as I found a shorter way and apparently the right way (https://docs.npmjs.com/misc/scripts#packagejson-vars)
Add this in your vue.config.file before the export, not inside:
process.env.VUE_APP_VERSION = process.env.npm_package_version
And voilà!
You can then use it from a component with process.env.VUE_APP_VERSION

TLDR
The following snippet in the vue.config.js file will do the trick, and will allow you to access the version of your app as APPLICATION_VERSION:
module.exports = {
configureWebpack: config => {
return {
plugins: [
new webpack.DefinePlugin({
'APPLICATION_VERSION': JSON.stringify(require('./package.json').version),
})
]
}
},
}
TIP:
Don't even try to add some key to process.env via webpack.definePlugin: it won't work as you probably expect.
 Why my previous efforts did not work
At the end, I solved the issue via webpack.DefinePlugin. The main issue I had is that the original solution I found was using definePlugin to write to a process.env.PACKAGE_JSON variable.
This suggests that definePlugin somehow allows to add variables to process or process.env, which is not the case. Whenever I did log process.env in the console, I didn't find the variables I was trying to push into process.env : so I though the definePlugin tech was not working.
Actually, what webpack.definePlugin does is to check for strings at compile time and change them to its value right on your code. So, if you define an ACME_VERSION variable via:
module.exports = {
lintOnSave: true,
configureWebpack: config => {
return {
plugins: [
new webpack.DefinePlugin({
'ACME_VERSION': 111,
})
]
}
},
}
and then, in main.js you print console.log(ACME_VERSION), you will get 111 properly logged.
Now, however, this is just a string change at compile time. If instead of ACME_VERSION you try to define process.env.VUE_APP_ACME_VERSION...
when you log process.env the VUE_APP_ACME_VERSION key won't show up in the object. However, a raw console.log('process.env.VUE_APP_ACME_VERSION') will yield 111 as expected.
So, basically, original link and the proposed solutions were correct to some degree. However, nothing was really being added to the process object. I was logging proccess.env during my initial tries, so I didn't see anything working.
Now, however, since the process object is not being modified, I strongly suggest anyone trying to load variables to their vue app at compile time not to use it. Is misleading at best.

You can simply import your package.json file and use its variables.
import { version } from "../../package.json";
console.log(version)
If you are using Webpack, you can inject the variable in the following way:
// webpack.config.js
plugins: [
new webpack.DefinePlugin({
VERSION: JSON.stringify(require("package.json").version)
})
]
// any-module.js
console.log("Version: " + VERSION);
https://github.com/webpack/webpack/issues/237

When building the Vue app, environment variables that don't begin with the VUE_APP_ prefix are filtered out. NODE_ENV and BASE_URL environment variables are the exception.
The above information applies when the environment variables are set prior to building the Vue app and not in this situation.
In a situation where environment variables are set during the build, it's important to look at what Vue CLI is doing.
The Vue CLI uses webpack.DefinePlugin to set environment variables using the object returned from the call to resolveClientEnv.
resolveClientEnv returns
{
'process.env': {}
}
This means when configuring your environment variables at build time, you need to come upon a way to merge with the existing one.
You need to perform a deep merge of both arrays, so that value for process.env key is an object containing keys from the resolved client environment and your keys.
chainWebpack key in the default export for vue.config.js is just about one of the ways to get this done.
The arguments passed to initialize the DefinePlugin can be merged with new environment variables that you like to configure using the underlying webpack-chain API. Here is an example:
// vue.config.js
const merge = require('deepmerge');
const pkgVersion = require('./package.json').version;
const VERSION = {
'process.env': {
VERSION: JSON.stringify(pkgVersion)
}
}
module.exports = {
chainWebpack: config =>
config
.plugin('define')
.tap(
args => merge(args, [VERSION])
)
}

Your initial attempt was fine, you were just missing the JSON.stringify part:
const webpack = require('webpack');
module.exports = {
configureWebpack: config => {
return {
plugins: [
new webpack.DefinePlugin({
'process.env': {
VERSION: JSON.stringify(require('./package.json').version),
}
})
]
}
},
}
Edit: although the webpack docs recommend the 'process.env.VERSION' way (yellow panel):
new webpack.DefinePlugin({
'process.env.VERSION': JSON.stringify(require('./package.json').version),
}),

Official solutions tend to be more reliable Modes and Environment Variables | Vue CLI
TIP
You can have computed env vars in your vue.config.js file. They still need to be prefixed with VUE_APP_. This is useful for version info
process.env.VUE_APP_VERSION = require('./package.json').version
module.exports = {
// config
}

I attempted the accepted answer, and had errors. However, in the vue docs, I was able to find an answer similar (but not quite) that of #antoni's answer.
In short, just have the following in vue.config.js:
process.env.VUE_APP_VERSION = require('./package.json').version
module.exports = {
// config
}
Docs 2020-10-27:
You can access env variables in your application code:
process.env.VUE_APP_NOT_SECRET_CODE = require('./package.json').version
During build, process.env.VUE_APP_NOT_SECRET_CODE will be replaced by the corresponding value. In the case of VUE_APP_NOT_SECRET_CODE=some_value, it will be replaced by "some_value".
In addition to VUE_APP_* variables, there are also two special variables that will always be available in your app code:
NODE_ENV - this will be one of "development", "production" or "test" depending on the mode the app is running in.
BASE_URL - this corresponds to the publicPath option in vue.config.js and is the base path your app is deployed at.

The answer for this on the official VueJS forum is like so:
chainWebpack: config => {
config
.plugin('define')
.tap(args => {
let v = JSON.stringify(require('./package.json').version)
args[0]['process.env']['VERSION'] = v
return args
})
}
Description
Add this line to your vue.config.js file
module.exports = {
...
chainWebpack: config => {
config
.plugin('define')
.tap(args => {
let v = JSON.stringify(require('./package.json').version)
args[0]['process.env']['VERSION'] = v
return args
})
}
};
Then you can use this in your vue files like so:
version: function () {
return process.env.VERSION
}

A one liner alternative:
//script tag
let packageJsonInfo = require("../../package.json");
//Then you can for example, get the version no
packageJsonInfo.version

babel generated code breaking istanbul coverage

I'm using babel to enable ES6 imports in a node project. Also using mocha for testing, and istanbul for coverage. I end up with less than full coverage because babel generates code something like the following:
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
var _promise = require('babel-runtime/core-js/promise');
var _promise2 = _interopRequireDefault(_promise);
var _koa = require('koa');
var _koa2 = _interopRequireDefault(_koa);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
Specifically, the generated function _interopRequireDefault is copied into every code file, and the branches are not necessarily always executed, which skews the branch coverage number emitted for istanbul. Is there any way around this issue?

If you're using gulp, I have a gist with a gulpfile here that sets up the necessary hooks and filters. The relevant chunk is to load isparta, hook require, and let the tests run:
gulp.task('test:cover', (cb) => {
gulp.src('src/main/**/*.js')
.pipe(istanbul({
instrumenter: require('isparta').Instrumenter,
includeUntested: true
}))
.pipe(babel())
.pipe(gulp.dest('target/cover'))
.pipe(istanbul.hookRequire())
.on('finish', cb);
});
gulp.task('test:mocha', (cb) => {
gulp.src('target/test/**/Test*')
.pipe(mocha())
.pipe(istanbul.writeReports())
.on('end', cb);
});
gulp.task('test', (cb) => {
return runSequence('test:cover', 'test:mocha', cb);
});
The only frustrating part is that your tests must use the covered code:
import {
LinearInterpolator,
CosineInterpolator
} from '../../cover/random/Interpolators';
I haven't found a way to work around that yet without also covering the test scripts and skewing coverage, although you should be able to do that by merging streams:
gulp.task('test:cover', (cb) => {
const src = gulp.src('src/main/**/*.js')
.pipe(istanbul({
instrumenter: require('isparta').Instrumenter,
includeUntested: true
}));
const test = gulp.src('src/test/**/*.js');
merge(src, test)
.pipe(babel())
.pipe(gulp.dest('target/cover'))
.pipe(istanbul.hookRequire())
.on('finish', cb);
});

You need to combine it with isparta - https://github.com/douglasduteil/isparta - to get the coverage working correctly. I warn you its a bit trial and error at the moment! My npm script looks like -
"coverage": "node_modules/.bin/babel-node node_modules/.bin/isparta cover --include-all-sources --report html node_modules/.bin/_mocha -- --reporter $npm_package_config_bdd_reporter",

We've run into this and I finally got fed up and looked into what causes this line. It turns out that every time to use an import like:
import chai from 'chai';
this babel fill gets added to allow sane interaction with older export styles. The trouble is that none of the common libraries exhibit the "true" branch of the ternary. I build the following file coverInterrop.js that artificially trips the first branch using old-school exports:
module.exports = {
__esModule: true
};
and I include in any file where I want to use an undestructured import:
// eslint-disable-next-line no-unused-vars
import coverInterrop from 'coverInterrop';
Note that it has to assign to a variable to trip the coverage and good eslint rules won't like that