簡記:node.js v20中設定typescript與.env

pnpm init

pnpm add -D typescript @types/node

src/index.ts

async function main(...args: string[]) {

console.debug('process.env.NODE_ENV=',

process.env.NODE_ENV

)

console.debug('process.env.STORAGE_BUCKET_NAME=',

process.env.STORAGE_BUCKET_NAME

)

}

const args = process.argv.slice(2);

main(...args).catch(console.error);

package.json

"type": "commonjs",

"scripts": {

"build": "tsc",

"dev": "pnpm run build && node --env-file=.env.development.local .",

"start": "pnpm run build && node --env-file=.env.production.local ."

},

tsconfig.json

"compilerOptions": {

"module": "CommonJS",

"moduleResolution": "Node",

"outDir": "dist",

"rootDir": "src"

這個設定的優點是import不需要寫.js, 缺點就是沒有top-level await

env.d.ts

declare namespace NodeJS {

interface ProcessEnv {

NODE_ENV: 'development' | 'production' | 'test';

STORAGE_BUCKET_NAME: string;

}

}

.env.development.local

STORAGE_BUCKET_NAME=test-bucket

NODE_ENV='development'