Netlify Function Proxy/Fetch Import Error

Update your NETLIFY function build

# inside netlify.toml / in your project root
[functions]
  node_bundler = "esbuild"

Add node-fetch@2 instead of the default node-fetch

yarn add node-fetch@2

Create the folders and function file.

mkdir netlify
mkdir netlify/functions
touch netlify/functions/proxy.js
atom netlify/functions/proxy.js

Inside your proxy.js, write some standard fetching code

import fetch from 'node-fetch';

exports.handler = async (event) => {
  const {email} = event.queryStringParameters;

  return fetch("https://api.example.come/v1/search", {
    method: "POST",
    headers: {Authorization: `Token YOUERTOKEN`,"Content-Type": "application/json"},
    body: JSON.stringify({ email }),
  })
    .then(response => response.json())
    .then(data => ({ statusCode: 200, body: JSON.stringify(data) }))
    .catch(error => ({ statusCode: 422, body: String(error) }))
}