Action Reference

👨‍💼 Great! So this is what our Node.js loader does to the actions.js module:

'use server'

import * as db from '../db/ship-api.js'

export async function updateShipName(previousState, formData) {
	try {
		await db.updateShipName({
			shipId: formData.get('shipId'),
			shipName: formData.get('shipName'),
		})
		return { status: 'success', message: 'Success!' }
	} catch (error) {
		return { status: 'error', message: error?.message || String(error) }
	}
}

import { registerServerReference } from 'react-server-dom-esm/server'
registerServerReference(
	updateShipName,
	'file:///Users/kentcdodds/code/epicweb-dev/react-server-components/playground/ui/actions.js',
	'updateShipName',
)

The registerServerReference function attaches this additional information onto our updateShipName function:

{
	"$$typeof": "Symbol(react.server.reference)",
	"$$id": "file:///Users/kentcdodds/code/epicweb-dev/react-server-components/playground/ui/actions.js#updateShipName",
	"$$bound": null,
	"bind": "function bind() {\n  // $FlowFixMe[unsupported-syntax]\n  var newFn = FunctionBind.apply(this, arguments);\n\n  if (this.$$typeof === SERVER_REFERENCE_TAG) {\n    // $FlowFixMe[method-unbinding]\n    var args = ArraySlice.call(arguments, 1);\n    return Object.defineProperties(newFn, {\n      $$typeof: {\n        value: SERVER_REFERENCE_TAG\n      },\n      $$id: {\n        value: this.$$id\n      },\n      $$bound: {\n        value: this.$$bound ? this.$$bound.concat(args) : args\n      },\n      bind: {\n        value: bind\n      }\n    });\n  }\n\n  return newFn;\n}"
}

The serialized version of this function looks like this in our RSC payload:

d:{"id":"file:///Users/kentcdodds/code/epicweb-dev/react-server-components/playground/ui/actions.js#updateShipName","bound":null}

So it's the path to the module + # + the name of the function. This is how we can find it on the server when the user submits the form. Let's get that passed along to the server next!

05. Server Actions/01. Action Reference (🏁 solution)

Action Reference