require.cache

• <Object>

模块在需要时缓存在此对象中。 通过从此对象中删除键值，下一次 require 将重新加载模块。 这不适用于原生插件，因为重新加载会导致错误。

添加或替换条目也是可能的。 在内置模块之前检查此缓存，如果将与内置模块匹配的名称添加到缓存中，则只有 node: 前缀的 require 调用将接收内置模块。 小心使用！

const assert = require('node:assert');
const realFs = require('node:fs');

const fakeFs = {};
require.cache.fs = { exports: fakeFs };

assert.strictEqual(require('fs'), fakeFs);
assert.strictEqual(require('node:fs'), realFs);

• <Object>

Modules are cached in this object when they are required. By deleting a key value from this object, the next require will reload the module. This does not apply to native addons, for which reloading will result in an error.

Adding or replacing entries is also possible. This cache is checked before built-in modules and if a name matching a built-in module is added to the cache, only node:-prefixed require calls are going to receive the built-in module. Use with care!

const assert = require('node:assert');
const realFs = require('node:fs');

const fakeFs = {};
require.cache.fs = { exports: fakeFs };

assert.strictEqual(require('fs'), fakeFs);
assert.strictEqual(require('node:fs'), realFs);