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

Prerequisites

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🚀 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

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	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)`