module.syncBuiltinESMExports()

module.syncBuiltinESMExports() 方法更新内置的 ES 模块的所有实时绑定，以匹配 CommonJS 导出的属性。 它不会在 ES 模块中添加或删除导出的名称。

const fs = require('fs');
const assert = require('assert');
const { syncBuiltinESMExports } = require('module');

fs.readFile = newAPI;

delete fs.readFileSync;

function newAPI() {
  // ...
}

fs.newAPI = newAPI;

syncBuiltinESMExports();

import('fs').then((esmFS) => {
  // 它将现有的 readFile 属性与新值同步
  assert.strictEqual(esmFS.readFile, newAPI);
  // readFileSync 已从所需的 fs 中删除
  assert.strictEqual('readFileSync' in fs, false);
  // syncBuiltinESMExports() 不会从 esmFS 中删除 readFileSync
  assert.strictEqual('readFileSync' in esmFS, true);
  // syncBuiltinESMExports() 不添加名称
  assert.strictEqual(esmFS.newAPI, undefined);
});

The module.syncBuiltinESMExports() method updates all the live bindings for builtin ES Modules to match the properties of the CommonJS exports. It does not add or remove exported names from the ES Modules.

const fs = require('fs');
const assert = require('assert');
const { syncBuiltinESMExports } = require('module');

fs.readFile = newAPI;

delete fs.readFileSync;

function newAPI() {
  // ...
}

fs.newAPI = newAPI;

syncBuiltinESMExports();

import('fs').then((esmFS) => {
  // It syncs the existing readFile property with the new value
  assert.strictEqual(esmFS.readFile, newAPI);
  // readFileSync has been deleted from the required fs
  assert.strictEqual('readFileSync' in fs, false);
  // syncBuiltinESMExports() does not remove readFileSync from esmFS
  assert.strictEqual('readFileSync' in esmFS, true);
  // syncBuiltinESMExports() does not add names
  assert.strictEqual(esmFS.newAPI, undefined);
});