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How to use ES modules in Netlify functions

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"type": "module",

To the repository’s root level package.json file.

Now instead of

exports.handler = async (event, context, callback) => {


use this:

export async function handler(event, context) {


And any time you used

callback(null, {
  statusCode: 200,
  body: html,

Now use

return {
  statusCode: 200,
  body: html,
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