node - node-fetch ERR_REQUIRE_ESM

[NaClYen]

error

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: C:\node-project\run\node_modules\node-fetch\src\index.js
require() of ES modules is not supported.
require() of C:\node-project\run\node_modules\node-fetch\src\index.js from C:\node-project\run\dist\worker.js is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename index.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from C:\node-project\run\node_modules\node-fetch\package.json.
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1089:13)
    at Module.load (internal/modules/cjs/loader.js:937:32)
    at Function.Module._load (internal/modules/cjs/loader.js:778:12)
    at Module.require (internal/modules/cjs/loader.js:961:19)
    at require (internal/modules/cjs/helpers.js:92:18)
    at Object.<anonymous> (C:\node-project\run\dist\worker.js:5:13)
    at Module._compile (internal/modules/cjs/loader.js:1072:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1101:10)
    at Module.load (internal/modules/cjs/loader.js:937:32)
    at Function.Module._load (internal/modules/cjs/loader.js:778:12) {
  code: 'ERR_REQUIRE_ESM'
}

原因

最近正在將跑在獨立環境的 app 移到一個控管環境中, build 成 .cjs 模式出現這問題, 才發現到 node-fetch v3 版本是ES module only 的!

處理

改成使用 v2 版本即可

npm install node-fetch@2

or

yarn add node-fetch@2