I am trying to use babel standalone inside a react app to transpile Angular TypeScript.
The short version:
How can I use #babel/plugin-proposal-decorators and #babel/plugin-proposal-class-properties with babel standalone?
The long version:
This tutorial https://medium.com/#hubert.zub/using-babel-7-and-preset-typescript-to-compile-angular-6-app-448eb1880f2c says that "apparently #babel/plugin-syntax-decorators doesn’t do the work and causes transform errors.". He recommends using the following config in a babelrc file:
{
"presets": [
"#babel/preset-env",
"#babel/preset-typescript"
],
"plugins": [
[
"#babel/plugin-proposal-decorators",
{
"legacy": true,
}
],
"#babel/plugin-proposal-class-properties"
]
}
using syntax-decorators does "work" for me but then I get another error that it does not recognise a selector for an imported component.
Since I am using babel standalone I need to use Babel.transform like this:
const TS_OPTIONS = {
presets: [
'typescript',
['es2017', { 'modules': false }],
],
plugins: [
// the following two options "work" but with another error
// 'syntax-decorators',
// 'syntax-class-properties',
// none of these options work
["#babel/plugin-proposal-decorators"],
["#babel/plugin-proposal-class-properties"],
//['plugin-proposal-decorators', { 'legacy': true }],
//['plugin-proposal-class-properties', { 'loose': true }],
// 'plugin-proposal-decorators',
// 'plugin-proposal-class-properties',
// ['syntax-decorators', { 'legacy': true }],
'transform-es2015-modules-commonjs',
],
};
my transpile function (greatly simplified):
export default function transpile(myCode) {
const { code } = Babel.transform(myCode, TS_OPTIONS);
return myCode;
}
No matter how I write the plugins it does not work. I keep getting an error along the lines of
Error: Invalid plugin specified in Babel options: "proposal-decorators"
using the syntax-decorators plugin will transpile the code but I get the following error when importing a component and trying to use the components selector:
Uncaught Error: Template parse errors:
'search-bar' is not a known element:
1. If 'search-bar' is an Angular component, then verify that it is part of this module.
2. If 'search-bar' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '#NgModule.schemas' of this component to suppress this message.
I solved this by upgrading the version of Babel I was using which gave me access to more available plugins. I posted another question that I thought was a different issue but it turns out they were related. I will reference that question here if anyone is interested: Angular Uncaught Error: Template parse errors: is not a known element
with babel-standalone .babelrc wont work .you might need to use transform to apply plugins .i am wondering why you exactly need to use standalone babel ?. if its react or angular you can just use babel only and don't need to use transform
Related
Error:
ParseError: /node_modules/preact/compat/dist/compat.module.js/jsx-runtime.js
Error: ENOTDIR: not a directory, open 'node_modules/preact/compat/dist/compat.module.js/jsx-runtime.js'
Issue: When I tried to migrate my react app from react-bootstrap v1 to react-bootstrap v2, I am getting the above error.
root cause: I guess the reason could be because of the aliasing method I use in the rollup.config.js file below. My objective in the below code is to alias react to preact which is working fine till react-bootstrap 1.6.4 but the error arises when I try to update/migrate the existing react-bootstrap 1.6.4 to it's latest version 2.2.3
Code:
`` alias({
entries: [
...['react', 'react-dom'].map(find => (
{ find, replacement: path.resolve(__dirname,'./node_modules/preact/compat/dist/compat.module.js') }
))
]
}), ``
Workaround: tried many workarounds for aliasing react to preact(rollup, webpack etc., from the official documentation provided in preact, but nothing seems to be working. The current preact version I am using is 10.x
My query: Is there a way to resolve this issue? I didn't make any code changes during the migration but the existing rollup config aliasing is breaking. Thanks in advance
You're aliasing incorrectly. The newer version of react-boostrap must use the new(-er) JSX runtime, and your alias is creating a junk path.
Take the following:
import { jsx } from 'react/jsx-runtime';
Your alias sees "react", and converts it to your alias:
import { jsx } from './node_modules/preact/compat/dist/compat.module.js/jsx-runtime';
Which is clearly not right.
You want to use the alias listed on our docs site:
import alias from '#rollup/plugin-alias';
module.exports = {
plugins: [
alias({
entries: [
{ find: 'react', replacement: 'preact/compat' },
{ find: 'react-dom/test-utils', replacement: 'preact/test-utils' },
{ find: 'react-dom', replacement: 'preact/compat' },
{ find: 'react/jsx-runtime', replacement: 'preact/jsx-runtime' }
]
})
]
};
I am currently having trouble with my React TypeScript project.
I created my project with npx create-react-app my-app --template typescript.
I recently added tsyringe for dependency injection and was trying to implement it for an apiService. After following the readme(https://github.com/microsoft/tsyringe#injecting-primitive-values-named-injection) for adding primitive values I have hit a block. I already add experimentalDecorators and emitDecoratorMetadata to my tsconfig.json file with no success.
The error actual error I am encountering is:
./src/ts/utils/NetworkService.ts 9:14
Module parse failed: Unexpected character '#' (9:14)
File was processed with these loaders:
* ./node_modules/#pmmmwh/react-refresh-webpack-plugin/loader/index.js
* ./node_modules/babel-loader/lib/index.js
You may need an additional loader to handle the result of these loaders.
|
| let NetworkService = (_dec = singleton(), _dec(_class = (_temp = class NetworkService {
> constructor(#inject('SpecialString')
| value) {
| this.str = void 0;
I am fairly sure this problem is caused by Babel, however I created this with npm create react-app --template typescript and do not seem to have access to the Babel configuration.
NetworkService.ts
#singleton()
export default class NetworkService
{
private str: string;
constructor(#inject('SpecialString') value: string) {
this.str = value;
}
}
Invocation method
bob()
{
const inst = container.resolve(NetworkService);
}
Registering Class in index.ts
container.register('SpecialString', {useValue: 'https://myme.test'});
#registry([
{ token: NetworkService, useClass: NetworkService },
])
class RegisterService{}
React-Scripts manages many of the configs related to the project. For many cases, this is fine and actually a nice feature. However, because React-Scripts uses Babel for it's development environment and does not expose the config.
You have to run npm run eject to expose the configurations.
Please note, this is a one-way operation and can not be undone.
Personally, I prefer more control with my configuration.
After this you can edit the webpack.config.js in the newly created config folder.
Find the section related to the babel-loader in the dev-environment and add 'babel-plugin-transform-typescript-metadata' to the plugins array.
Expanding on Jordan Schnur's reply, here are some more pitfalls I encountered when adding TSyringe to my CRA app:
Use import type with #inject
If you get this error "TS1272: A type referenced in a decorated signature must be imported with 'import type' or a namespace import when 'isolatedModules' and 'emitDecoratorMetadata' are enabled." replace import with import type for the offending imports. You will encounter this when working with #inject
E.g. replace import { IConfig } from "iconfig" with import type { IConfig } from "iconfig"
Fixing Jest
Your Jest tests will also break with TSyringe, especially when using #inject. I got the error "Jest encountered an unexpected token" with details constructor(#((0, _tsyringe.inject)("")) ("#" marked as the offending token). I took the following steps to fix that in CRA:
Add the line import "reflect-metadata"; to the top of the file src/setupTests.ts
In config/jest/babelTransform.js replace line 18 and following:
From
module.exports = babelJest.createTransformer({
presets: [
[
require.resolve('babel-preset-react-app'),
{
runtime: hasJsxRuntime ? 'automatic' : 'classic',
},
],
],
babelrc: false,
configFile: false,
});
to:
module.exports = babelJest.createTransformer({
presets: [
[
require.resolve('babel-preset-react-app'),
{
runtime: hasJsxRuntime ? 'automatic' : 'classic',
},
],
],
plugins: [
require.resolve('babel-plugin-transform-typescript-metadata')
],
babelrc: false,
configFile: false,
});
Instead of eject, you may use a lib that "overrides" some of your params.
I used craco : https://www.npmjs.com/package/#craco/craco
I've created an simpler DI library that doesn't need decorators or polyfill. Works with CRA like a charm and has cool React bindings
iti
import { useContainer } from "./_containers/main-app"
function Profile() {
const [auth, authErr] = useContainer().auth
if (authErr) return <div>failed to load</div>
if (!auth) return <div>loading...</div>
return <div>hello {auth.profile.name}!</div>
}
I was starting to work with a web application built with TypeScript/React/Storybook. I noticed when I write a class:
class MyClass {
constructor(public a) { }
}
console.log(MyClass);
and run the unit tests with jest, or using tsc to emit code, it generates the expected JS code like:
function MyClass(a) {
this.a = a;
}
But when I run it in a Storybook app with development server, it prints out the JS code like:
function MyClass(a) {
_classCallCheck(this, MyClass);
}
I'm thinking if it's related to the TypeScript compiler version picked by ts-loader, but cannot figure it out. I checked the TypeScript version installed to my node_modules folder, and it's v4.1.2, which looks nothing wrong with me.
Also I mentioned Playbook here (and left "playbook" in the tags) only because my app is with it. It might not be directly related to this issue.
Seems like an issue with recent versions #babel/preset-typescript if you are using it. You can change your babel configuration to use "#babel/plugin-transform-typescript" plugin instead of #babel/preset-typescript preset.
More info: https://www.gitmemory.com/issue/babel/babel/8752/486541662
If generated by storybook, your babel config probably looks like:
module.exports = {
presets: [
["#babel/preset-env", { targets: { node: "current" } }],
"#babel/preset-typescript",
],
};
Then change it to:
module.exports = {
presets: [["#babel/preset-env", { targets: { node: "current" } }]],
plugins: ["#babel/plugin-transform-typescript"],
};
I would like to use TensorFlow in react native - managed flow by expo. When I use the https://github.com/tensorflow/tfjs/tree/master/tfjs-react-native bridge, I am getting an error when running on android that babel needs the option allowNamespaces set to true for #babel/plugin-transform-typescript.
So I changed the babel.config.js to:
module.exports = function(api) {
api.cache(true);
return {
presets: ["babel-preset-expo"],
plugins: [
"#babel/plugin-transform-typescript",
{
allowNamespaces: true
}
]
};
};
But now I am getting the error Error: [BABEL] /node_modules/expo/AppEntry.js: .allowNamespaces is not a valid Plugin property, so it adds the dot in the beggining.
I tried to put it into .babelrc but still the same. Any idea how to solve this? Thanks
I did more tries and finally, .babelrc configuration is passed correctly:
{
"plugins": [
["#babel/plugin-transform-typescript", { "allowNamespaces": true }]
]
}
I use webpack to develop a React component. Here is a simple version of it:
'use strict';
require('./MyComponent.less');
var React = require('react');
var MyComponent = React.createClass({
render() {
return (
<div className="my-component">
Hello World
</div>
);
}
});
module.exports = MyComponent;
Now, I would like to test this component using jest. Here is the relevant bit from my package.json:
"scripts": {
"test": "jest"
},
"jest": {
"rootDir": ".",
"testDirectoryName": "tests",
"scriptPreprocessor": "<rootDir>/node_modules/babel-jest",
"unmockedModulePathPatterns": [
"react"
]
}
When running npm test, I get the following error:
SyntaxError: /Users/mishamoroshko/react-component/src/tests/MyComponent.js: /Users/mishamoroshko/react-component/src/MyComponent.js: /Users/mishamoroshko/react-component/src/MyComponent.less: Unexpected token ILLEGAL
Looks like webpack needs to process require('./MyComponent.less') before jest can run the test.
I wonder if I need to use something like jest-webpack. If yes, is there a way to specify multiple scriptPreprocessors? (note that I already use babel-jest)
The cleanest solution I found for ignoring a required module is to use the moduleNameMapper config (works on the latest version 0.9.2)
The documentation is hard to follow. I hope the following will help.
Add moduleNameMapper key to your packages.json config. The key for an item should be a regex of the required string. Example with '.less' files:
"moduleNameMapper": { "^.*[.](less|LESS)$": "EmptyModule" },
Add a EmptyModule.js to your root folder:
/**
* #providesModule EmptyModule
*/
module.exports = '';
The comment is important since the moduleNameMapper use EmptyModule as alias to this module (read more about providesModule).
Now each require reference that matches the regex will be replaced with an empty string.
If you use the moduleFileExtensions configuration with a 'js' file, then make sure you also add the EmptyModule to your 'unmockedModulePathPatterns'.
Here is the jest configuration I ended up with:
"jest": {
"scriptPreprocessor": "<rootDir>/node_modules/babel-jest",
"moduleFileExtensions": ["js", "json","jsx" ],
"moduleNameMapper": {
"^.*[.](jpg|JPG|gif|GIF|png|PNG|less|LESS|css|CSS)$": "EmptyModule"
},
"preprocessorIgnorePatterns": [ "/node_modules/" ],
"unmockedModulePathPatterns": [
"<rootDir>/node_modules/react",
"<rootDir>/node_modules/react-dom",
"<rootDir>/node_modules/react-addons-test-utils",
"<rootDir>/EmptyModule.js"
]
}
I ended up with the following hack:
// package.json
"jest": {
"scriptPreprocessor": "<rootDir>/jest-script-preprocessor",
...
}
// jest-script-preprocessor.js
var babelJest = require("babel-jest");
module.exports = {
process: function(src, filename) {
return babelJest.process(src, filename)
.replace(/^require.*\.less.*;$/gm, '');
}
};
But, I'm still wondering what is the right solution to this problem.
I just found that it's even simpler with Jest's moduleNameMapper configuration.
// package.json
"jest": {
"moduleNameMapper": {
"^.+\\.scss$": "<rootDir>/scripts/mocks/style-mock.js"
}
}
// style-mock.js
module.exports = {};
More detail at Jest's tutorial page.
I recently released Jestpack which might help. It first builds your test files with Webpack so any custom module resolution/loaders/plugins etc. just work and you end up with JavaScript. It then provides a custom module loader for Jest which understands the Webpack module runtime.
From Jest docs:
// in terminal, add new dependency: identity-obj-proxy
npm install --save-dev identity-obj-proxy
// package.json (for CSS Modules)
{
"jest": {
"moduleNameMapper": {
"\\.(css|less)$": "identity-obj-proxy"
}
}
}
The snippet above will route all .less files to the new dependency identity-obj-proxy, which will return a string with the classname when invoked, e.g. 'styleName' for styles.styleName.
I think a less hacky solution would be to wrap your preprocessor in a conditional on the filename matching a javascript file:
if (filename.match(/\.jsx?$/)) {
return babelJest.process(src, filename);
} else {
return '';
}
This works even if you don't explicitly set the extension in the require line and doesn't require a regex substitution on the source.
I have experienced similar issue with such pattern
import React, { PropTypes, Component } from 'react';
import styles from './ContactPage.css';
import withStyles from '../../decorators/withStyles';
#withStyles(styles)
class ContactPage extends Component {
see example at https://github.com/kriasoft/react-starter-kit/blob/9204f2661ebee15dcb0b2feed4ae1d2137a8d213/src/components/ContactPage/ContactPage.js#L4-L7
For running Jest I has 2 problems:
import of .css
applying decorator #withStyles (TypeError: <...> (0 , _appDecoratorsWithStyles2.default)(...) is not a function)
First one was solved by mocking .css itself in script preprocessor.
Second one was solved by excluding decorators from automocking using unmockedModulePathPatterns
module.exports = {
process: function (src, filename) {
...
if (filename.match(/\.css$/)) src = '';
...
babel.transform(src, ...
}
}
example based on https://github.com/babel/babel-jest/blob/77a24a71ae2291af64f51a237b2a9146fa38b136/index.js
Note also: when you working with jest preprocessor you should clean cache:
$ rm node_modules/jest-cli/.haste_cache -r
Taking inspiration from Misha's response, I created an NPM package that solves this problem while also handling a few more scenarios I came across:
webpack-babel-jest
Hopefully this can save the next person a few hours.
If you're using babel, you can strip unwanted imports during the babel transform using something like https://github.com/Shyp/babel-plugin-import-noop and configuring your .babelrc test env to use the plugin, like so:
{
"env": {
"development": {
...
},
"test": {
"presets": [ ... ],
"plugins": [
["import-noop", {
"extensions": ["scss", "css"]
}]
]
}
}
}
We had a similar problem with CSS files. As you mentioned before jest-webpack solves this problem fine. You won't have to mock or use any module mappers either. For us we replaced our npm test command from jest to jest-webpack and it just worked.
Webpack is a great tool, but I don't need to test it's behavior with my Jest unit tests, and adding a webpack build prior to running unit tests is only going to slow down the process. The text-book answer is to mock non-code dependencies using the "moduleNameMapper" option
https://facebook.github.io/jest/docs/webpack.html#handling-static-assets