emit CJS/ESM syntax in standalone mode based on AJV code options

[mouhannad-sh]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

Use the AJV code option to decide if the standalone code generator would emit CJS (require/module) or ESM (import/export) instead of hardcoding require and module.exports as shown below in the standalone.js file

fast-json-stringify/lib/standalone.js

Lines 14 to 23 in 74c35c0

	const { dependencies } = require('fast-json-stringify/lib/standalone')
	const { Serializer, Validator } = dependencies
	const serializerState = ${JSON.stringify(serializer.getState())}
	const serializer = Serializer.restoreFromState(serializerState)
	${ajvDependencyCode}
	module.exports = ${contextFunc.toString()}(validator, serializer)`

Motivation

Typescript and ESM users will have to go through some build system configurations to resolve the require in ESM runtime headache during development. Especially that the StandaloneValidator from the @fastify/ajv-compiler package respects the ESM AJV option out of the box.

If we can leverage the serializerOptions, Fastify users in ESM envirmenment can easily use a standalone serializers with the AJV options

ajv: {
  code: { source: true, esm: true } 
}

Example

No response

[mcollina]

Thanks for reporting! Would you like to send a Pull Request to address this issue? Remember to add unit tests.