npm i -D react-native-typescript-transformer ts-jest
tsc --init
npm i -S @types/react @types/react-native @types/react-test-renderer @types/jest
app.json
{"expo": {
"sdkVersion": "27.0.0",
"packagerOpts": {
"sourceExts": [
"ts",
"tsx"
],
"transformer": "node_modules/react-native-typescript-transformer/index.js"
}
}
}
package.json
"babel": {
"presets": ["expo"]
},
"jest": {
"preset": "jest-expo",
"transform": {
"^.+\\.jsx?$": "<rootDir>/node_modules/babel-jest",
"^.+\\.tsx?$": "ts-jest"
},
"testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
"moduleFileExtensions": ["ts", "tsx", "js", "jsx", "json", "node"],
"transformIgnorePatterns": ["<rootDir>/node_modules/react-native-vector-icons"],
"globals": {
"ts-jest": {
"useBabelrc": true
}
}
}