javascript——修复这种类型错误的正确方法是什么？

解决这个问题的正确方法是什么？我不想只是铸造或复制数组，转换undefined一个空字符串或类似的东西。我想这很有意思。解决这个问题的正确方法是什么？

Type 'ProcessEnv' is not assignable to type '{ [key: string]: string; }'.
  'string' index signatures are incompatible.
    Type 'string | undefined' is not assignable to type 'string'.
      Type 'undefined' is not assignable to type 'string'.ts(2322)
node-pty.d.ts(45, 5): The expected type comes from property 'env' which is declared here on type 'IPtyForkOptions | IWindowsPtyForkOptions'

代码：

import { IPty, spawn } from 'node-pty';

    ptyProcess = spawn(shell, [], {
      name: 'xterm-color',
      cols: 80,
      rows: 30,
      cwd: process.env.HOME,
      env: process.env // error comes from this assignment
    });

编辑1：

目前我正在做：

interface INonUndefinedEnv {
  [key: string]: string
}

const safeEnv = () => {
  let o:INonUndefinedEnv = {};
  for(const [key, value] of Object.keys(process.env).entries())
      o[key] = value ?? ""; // make sure it's string and never undefined
  return o;
}

然后我可以做：

ptyProcess = spawn(shell, [], {
  name: 'xterm-color',
  cols: 80,
  rows: 30,
  cwd: process.env.HOME,
  env: safeEnv() // type match
});

但如果可能的话，我想避免所有这些循环。