create-react-ssr/jest.config.js

const { pathsToModuleNameMapper } = require("ts-jest");
const { compilerOptions } = require("./tsconfig");

const aliases = pathsToModuleNameMapper(compilerOptions.paths, {
  prefix: "<rootDir>"
})

module.exports = {
  setupFilesAfterEnv: ['<rootDir>/setupTest.ts'],
  testEnvironment: "jsdom",
  moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json"],
  moduleNameMapper: {
    ...aliases,
    "\\.(jpg|ico|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/src/__mocks__/fileMock.ts",
    "\\.(css|sass|scss|less)$": "identity-obj-proxy",
  }
};