Alias node-fetch

[ptbrowne]

node-fetch can be used to provide the fetch function to services.

Recently, it introduced a "module" entrypoint that is used by webpack when webpack's target is node.

  "main": "lib/index",
  "browser": "./browser.js",
  "module": "lib/index.mjs",

Since the mjs is prior to js in webpack's default resolve.extensions, the module is used in priority.

It caused problems in banks since the result of the require was a "module" object with a default property. Other libs (like isomorphic-fetch) rely on the result of require('node-fetch') to be the fetch function.

This is why in banks, the resolve was forced to use lib/index.js. See https://github.com/cozy/cozy-banks/blob/e6bc4fdc762031300de393811a03dd926c878a89/config/webpack.target.services.js#L90.