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Uninstall jest (this is due to some weird version resolution between jest and babel when jest is installed in advanced)
npm uninstall jest @types/jest
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Install all dev dependencies
npm i -D jest @types/jest @babel/core @babel/preset-env @babel/preset-typescript @types/aws-lambda @typescript-eslint/eslint-plugin @typescript-eslint/parser babel-core@7.0.0-bridge.0 babel-eslint babel-jest babel-loader eslint eslint-config-prettier typescript
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If you need React, install additional dependencies
npm i react react-dom npm i -D @types/react @types/react-dom @babel/preset-react
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Add
.babelrc
{ "presets": [ [ "@babel/preset-env", { "targets": { "node": "12" } } ], "@babel/preset-typescript" ] }
If you need React, add
@babel/preset-react
before@babel/preset-typescript
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Add
.eslintrc.json
{ "extends": [ "eslint:recommended", "plugin:@typescript-eslint/recommended", "prettier", "prettier/@typescript-eslint" ], "parser": "@typescript-eslint/parser", "env": { "node": true, "es6": true, "jest": true }, "plugins": ["@typescript-eslint"], "rules": { "@typescript-eslint/interface-name-prefix": [2, "always"], "@typescript-eslint/explicit-function-return-type": 0, "@typescript-eslint/no-explicit-any": 0 } }
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Add
tsconfig.json
{ "compilerOptions": { /* Basic Options */ "target": "ES2017" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */, "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */, // "lib": [], /* Specify library files to be included in the compilation. */ "allowJs": true /* Allow javascript files to be compiled. */, // "checkJs": true, /* Report errors in .js files. */ // "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */ "resolveJsonModule": true, // "declaration": true, /* Generates corresponding '.d.ts' file. */ // "declarationMap": true, /* Generates a sourcemap for each corresponding '.d.ts' file. */ // "sourceMap": true, /* Generates corresponding '.map' file. */ // "outFile": "./", /* Concatenate and emit output to single file. */ // "outDir": "./", /* Redirect output structure to the directory. */ // "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */ // "composite": true, /* Enable project compilation */ // "removeComments": true, /* Do not emit comments to output. */ "noEmit": true /* Do not emit outputs. */, // "importHelpers": true, /* Import emit helpers from 'tslib'. */ // "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */ "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */ /* Strict Type-Checking Options */ "strict": true /* Enable all strict type-checking options. */, "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */, "strictNullChecks": true /* Enable strict null checks. */, // "strictFunctionTypes": true, /* Enable strict checking of function types. */ // "strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */ // "strictPropertyInitialization": true, /* Enable strict checking of property initialization in classes. */ // "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */ // "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */ /* Additional Checks */ "noUnusedLocals": true /* Report errors on unused locals. */, "noUnusedParameters": true /* Report errors on unused parameters. */, // "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */ // "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */ /* Module Resolution Options */ // "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */ // "baseUrl": "./", /* Base directory to resolve non-absolute module names. */ // "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */ // "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */ // "typeRoots": [], /* List of folders to include type definitions from. */ // "types": [], /* Type declaration files to be included in compilation. */ // "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */ "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */ // "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */ /* Source Map Options */ // "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */ // "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */ // "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */ // "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */ /* Experimental Options */ // "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */ // "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */ }, "include": ["src"] }
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Add babel-loader to
webpack.config.js
const path = require('path'); const fs = require('fs'); let nodeModules = {}; const buildDir = path.join(__dirname, 'build'); fs.readdirSync('node_modules') .filter(x => ['.bin'].indexOf(x) === -1) .forEach(mod => (nodeModules[mod] = 'commonjs ' + mod)); /** * @type {import('webpack').Configuration} */ module.exports = { entry: './src/index.ts', target: 'node', output: { path: buildDir, libraryTarget: 'commonjs', filename: `index.js` }, module: { rules: [ { test: /\.(ts|tsx)$/, exclude: /node_modules/, use: ['babel-loader'] } ] }, resolve: { extensions: ['*', '.js', '.jsx', '.ts', '.tsx', '.json'] }, externals: ['aws-sdk'], devtool: 'source-map', plugins: [] };
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Add
lint
andtypecheck
scripts topackage.json
:{ "scripts": { "lint": "eslint --ext .js,.ts,.tsx src --ignore-pattern \"**/*.spec.js\" --ignore-pattern \"**/*.spec.ts\"", "typecheck": "tsc --noEmit" } }