Page's function to proxy an analytics script (from Plausible.io), getting console MIME related error

Refused to execute script from '[URL_REDACTED]' because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled.

Refused to execute script from '[URL_REDACTED]' because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled.

const ScriptName = '/js/script.js'
const Endpoint = '/api/event'

const ScriptWithoutExtension = ScriptName.replace('.js', '')

export async function onRequest({ request, waitUntil }) {
    const pathname = new URL(request.url).pathname
    const [baseUri, ...extensions] = pathname.split('.')

    if (baseUri.endsWith(ScriptWithoutExtension)) {
        return getScript(request, waitUntil, extensions)
    } else if (pathname.endsWith(Endpoint)) {
        return postData(request)
    }
    return new Response(null, { status: 404 })
}

async function getScript(request, waitUntil, extensions) {
    let response = await caches.default.match(request)
    if (!response) {
        response = await fetch('https://plausible.io/js/plausible.' + extensions.join('.'))
        waitUntil(caches.default.put(request, response.clone()))
    }
    return response
}

async function postData(req) {
    const request = new Request(req)
    request.headers.delete('cookie')
    return await fetch('https://plausible.io/api/event', request)
}

const ScriptName = '/js/script.js'
const Endpoint = '/api/event'

const ScriptWithoutExtension = ScriptName.replace('.js', '')

export async function onRequest({ request, waitUntil }) {
    const pathname = new URL(request.url).pathname
    const [baseUri, ...extensions] = pathname.split('.')

    if (baseUri.endsWith(ScriptWithoutExtension)) {
        return getScript(request, waitUntil, extensions)
    } else if (pathname.endsWith(Endpoint)) {
        return postData(request)
    }
    return new Response(null, { status: 404 })
}

async function getScript(request, waitUntil, extensions) {
    let response = await caches.default.match(request)
    if (!response) {
        response = await fetch('https://plausible.io/js/plausible.' + extensions.join('.'))
        waitUntil(caches.default.put(request, response.clone()))
    }
    return response
}

async function postData(req) {
    const request = new Request(req)
    request.headers.delete('cookie')
    return await fetch('https://plausible.io/api/event', request)
}