process.exitCode

• <integer> | <string> | <null> | <undefined> 退出码。对于字符串类型，仅允许整数字符串（例如，'1'）。默认值：undefined。

  ¥<integer> | <string> | <null> | <undefined> The exit code. For string type, only integer strings (e.g.,'1') are allowed. Default: undefined.

当进程正常退出或通过 process.exit() 退出而不指定代码时，将作为进程退出码的数字。

¥A number which will be the process exit code, when the process either exits gracefully, or is exited via process.exit() without specifying a code.

可以通过将值分配给 process.exitCode 或将参数传递给 process.exit() 来更新 process.exitCode 的值：

¥The value of process.exitCode can be updated by either assigning a value to process.exitCode or by passing an argument to process.exit():

$ node -e 'process.exitCode = 9'; echo $?
9
$ node -e 'process.exit(42)'; echo $?
42
$ node -e 'process.exitCode = 9; process.exit(42)'; echo $?
42 拷贝

当发生不可恢复的错误（例如遇到未解决的顶层等待）时，Node.js 也可以隐式设置该值。但是，退出代码的显式操作始终优先于隐式操作：

¥The value can also be set implicitly by Node.js when unrecoverable errors occur (e.g. such as the encountering of an unsettled top-level await). However explicit manipulations of the exit code always take precedence over implicit ones:

$ node --input-type=module -e 'await new Promise(() => {})'; echo $?
13
$ node --input-type=module -e 'process.exitCode = 9; await new Promise(() => {})'; echo $?
9 拷贝