jest.base.config.js

const fs = require("fs")
const path = require("path")

module.exports = function buildConfig(
    packageDirectory,
    pkgConfig,
    tsConfig = "tsconfig.test.json"
) {
    const packageName = require(`${packageDirectory}/package.json`).name
    const packageTsconfig = path.resolve(packageDirectory, tsConfig)
    return {
        preset: "ts-jest/presets/js-with-ts",
        testEnvironment: "jsdom",
        globals: {
            __DEV__: true
        },
        transform: {
            "^.+\\.[jt]sx?$": [
                "ts-jest",
                {
                    tsconfig: fs.existsSync(packageTsconfig)
                        ? packageTsconfig
                        : path.resolve(__dirname, tsConfig)
                }
            ]
        },
        testRegex: "__tests__/.*\\.(j|t)sx?$",
        coverageDirectory: "<rootDir>/coverage/",
        coverageReporters: ["lcov", "text"],
        collectCoverageFrom: ["<rootDir>/src/**/*.{ts,tsx}", "!**/node_modules/**"],
        displayName: packageName,
        ...pkgConfig
    }
}