定义并替换静态全局变量和常量

if (process.env.NODE_ENV === "production") {
  console.log("生产模式");
} else {
  console.log("开发模式");
}

if ("production" === "production") { 
  console.log("生产模式");
} else {
  console.log("开发模式");
}

if (true) { 
  console.log("生产模式");
}

console.log("生产模式");

bun --define window="undefined" src/index.ts

if (typeof window !== "undefined") {
  console.log("客户端代码");
} else {
  console.log("服务器端代码");
}

bun --define global="globalThis" src/index.ts

# JSON
bun --define AWS='{"ACCESS_KEY":"abc","SECRET_KEY":"def"}' src/index.ts

console.log(AWS.ACCESS_KEY); // => "abc"

console.log({ ACCESS_KEY: "abc", SECRET_KEY: "def" }.ACCESS_KEY);

bun --define console.write=console.log src/index.ts

console.write("Hello, world!");

console.log("Hello, world!");