Serverless Framework・Lambda・TypeScriptプロジェクトの環境構築の一例

$ serverless create --template aws-nodejs-typescript --path serverless-sample-project

$ npm init --yes
→package.json作成、--yesオプションは-yでもOK(なしでもOK)
$ npm install
→package.jsonに記載されたパッケージを一括でインストール

constserverlessConfiguration:AWS={provider:{region:"ap-northeast-1"}}

$ serverless deploy --stage 環境名(デフォルトでdev) --aws-profile my_profile(プロファイル名、デフォルトでdefault)

// デプロイ成功後に下記表示
functions:
  hello: serverless-sample-project-dev-hello

$ git init
からadd, commit, GitHub上でリポジトリ作成, remote add origin, pushなど

$ npm install --save-dev eslint
$ ./node_modules/.bin/eslint --init

✔ How would you like to use ESLint? · problems
✔ What type of modules does your project use? · commonjs
✔ Which framework does your project use? · none
✔ Does your project use TypeScript? · No / Yes
✔ Where does your code run? · node
✔ What format do you want your config file to be in? · JavaScript
@typescript-eslint/eslint-plugin@latest @typescript-eslint/parser@latest ?
Would you like to install them now with npm? ・ Yes

{scripts:{"lint":"eslint","lint:fix":"eslint --fix"}}

webpack.config.js

module.exports={"env":{"jest":true},rules:{"@typescript-eslint/no-var-requires":0}}

error  'describe' is not defined   no-undef
error  'beforeAll' is not defined  no-undef
error  'it' is not defined         no-undef
error  'expect' is not defined     no-undef

$ npm run lint .

$ npm install --save-dev jest ts-jest @types/jest serverless-jest-plugin

constserverlessConfiguration:AWS={plugins:["serverless-webpack","serverless-jest-plugin"// ←追加],}

$ touch jest.config.js

module.exports={roots:["<rootDir>"],testMatch:["**/__tests__/**/*.+(ts|tsx|js)","**/?(*.)+(spec|test).+(ts|tsx|js)",],transform:{"^.+\\.(ts|tsx)$":"ts-jest",},};

$ serverless create test -f hello (serverless-jest-pluginのコマンド)
→__tests_/hello.test.js作成
$ mv __tests__/hello.test.js __tests__/hello.test.ts

{scripts:{"test":"jest","ts-node":"ts-node"}}

$ npm run lint .
$ npm run test

$ serverless deploy --stage dev --aws-profile my_profile