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

Import txt files as string into your next.js App

 import file from './xxx.txt'

Webpack 5 has 'Asset Modules' to allow you to import assets without configuring loaders now.

Next.js use Webpack 5 internally, so we can use 'source assets' to import txt files as strings.

Two steps to let you be able to import a txt file as a string.

custom Webpack config for next.js

config.module.rules.push({

test: /\.txt$/i,

type: 'asset/source'

})

declare txt as a module for typescript

Wildcard module declarations can be used to cover these cases.

declare module '*.txt' {

const content: string;

export default content;

}

example

import t1 from './1.txt'

console.log(t1)

output

event - compiled successfully

离开罪之路的人蒙祝福，

他不去随从恶人的计谋，

他不会站在罪人的道路上，

也不去坐好讥笑人的座位，

他喜爱的是耶和华律法，

昼夜默诵的也是他律法。

The full commit to enabling import txt files in your next.js app

references

How to Use SODA for REST with OAuth Client Credentials in your Node.js/Web App to CRUD Oracle Autonomous Database?

Use SODA for REST with OAuth Client Credentials in your Node.js or Web application to CRUD Oracle Autonomous Database