set up jest for your typescript project and how to import txt files in your unit tests

 

Getting Started

These instructions will get you setup to use ts-jest in your project. For more detailed documentation, please check online documentation.

	using npm	using yarn
Prerequisites	npm i -D jest typescript	yarn add --dev jest typescript
Installing	npm i -D ts-jest @types/jest	yarn add --dev ts-jest @types/jest
Creating config	npx ts-jest config:init	yarn ts-jest config:init
Running tests	npm t or npx jest	yarn test or yarn jest

to import txt file as string, via jest-raw-loader

/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */

module.exports = {

preset: 'ts-jest',

testEnvironment: 'node',

"transform": {

"\\.txt$": "jest-raw-loader"

}

};

or follow https://nextjs.org/docs/testing if you are using next.js

https://www.npmjs.com/package/jest-raw-loader

https://github.com/kulshekhar/ts-jest

https://jestjs.io/zh-Hans/docs/getting-started

https://jestjs.io/docs/configuration#transform-objectstring-pathtotransformer--pathtotransformer-object