Categories
Mastering Development

“Including” socket.io-client in vanilla typescript

I decided to use Typescript to create a class that will expose some methods which use socket.io-client. I have two Typescript source files and a socket.io.js (client) file: file1.ts file2.ts socket.io.js (client) file2.ts depends on file1.ts and file1.ts depends on socket.io.js. I would like to have one .js file in the end which I can […]

Categories
Mastering Development

You may need an appropriate loader to handle this file type, currently no loaders are configured to process file

I just created a project using create-react-app (in javascript). In that, I am linking one of my other repository like this { "name": "hh-frontend-example", "version": "0.1.0", "private": true, "dependencies": { "@testing-library/jest-dom": "^4.2.4", "@testing-library/react": "^9.3.2", "@testing-library/user-event": "^7.1.2", "hh-stylesheet": "file:../hh-stylesheet", "react": "^16.13.1", "react-dom": "^16.13.1", "react-scripts": "3.4.1" }, Here notice this line: "hh-stylesheet": "file:../hh-stylesheet", Now, When I start […]

Categories
Mastering Development

Property ‘toBeInTheDocument’ does not exist on type ‘Matchers

Trying to setup testing for a components library. I’ve tried many example and all similar threads on this with no luck. My setupTests.ts file is correctly being loaded (proven with a console.log), and the library seems to be available as if I add import { toBeInTheDocument } from ‘@testing-library/jest-dom/matchers’ and log toBeInTheDocument it is present. […]

Categories
Mastering Development

Issue trying to setup jest: application code compiles fine but test code doesn’t

I am trying to migrate to jest and I am facing typescript issues… I have 3 tsconfig files: tsconfig.json (base config) tsconfig.lib.json (application config) tsconfig.jest-spec.json (jest-dedicated test config) Please note that there are also karma/jasmine dedicated tsconfig files but those are irrelevant. I have separated the jest tests from the karma ones. tsconfig.json { "compileOnSave": […]

Categories
Mastering Development

Unexpected token “export” using babel in docker container with docker-compose and typescript monorepo

I have been struggling with the following issue over the last couple days and can’t seem to track it down. I have a typescript monorepo with a shared package that I am trying to develop in docker using docker-compose. I can run them all directly from my local machine with yarn and everything boots up […]

Categories
Mastering Development

Cannot read property ‘fromJSON’ of undefined while testing in Jest

while running jest i get the following error.I dont know why am i getting this error. TypeError: Cannot read property ‘fromJSON’ of undefined at Object. (node_modules/@grpc/proto-loader/node_modules/protobufjs/ext/descriptor/index.js:3:66) at Object. (node_modules/@grpc/proto-loader/build/src/index.js:23:20) Below is the tsconfig.json { “compilerOptions”: { “target”: “esnext”, “module”: “commonjs”, “outDir”: “dist”, “sourceMap”: true, “moduleResolution”: “node”, “declaration”: true, “experimentalDecorators”: true, “allowSyntheticDefaultImports”: true, /* Allow default […]

Categories
Mastering Development

Mocked `fs.createFileSync` and `fs.unlinkSync` are not getting called

I have a function that does a lot of things, but among them is that it copies a file to a special directory, does something with it (calls something to interact with that file without using the fs module), and then deletes the copied file once finished. import { copyFileSync, unlinkSync } from ‘fs’; myOtherFunction(path: […]

Categories
Development

Why is this React Typescript app throwing errors?

I just created a new React app using npx create-react-app my-app –template typescript and it was working fine until I changed my component to from a stateless one to a stateful one. The error: JSX element type ‘App’ is not a constructor function for JSX elements. TS2605 3 | import App from “./App”; 4 | […]

Categories
Development

How to stop TypeScript error ‘Type A has no properties in common with Type B’ when Type B “extends” Type A in some way

(edited Title to make more general) I’m working in a codebase which uses React class components and Typescript everywhere, and I’m trying to implement react-dropzone (a lightweight, simple but effective file-drop component) using the class-based method. The Hooks implementation is cleaner and simpler but I’d prefer to avoid so as to preserve the paradigm maintained […]