vite build for SvelteKit continues to say "No adapter specified" for static adapter

I'm trying to use the static site generator adapter for SvelteKit. I tried making a clean minimal SvelteKit project using npx sv create my-app and added adapter-static and verified that it worked, yet doing the same to my existing SvelteKit project continues to fail and I have no idea why. I put console.log statements in both the svelte and vite configs, but I only saw the vite config log when I ran npm run build, so it seems to me that Vite isn't loading my Svelte config which has my adapter. I even tried copying the versions from the package.json of the clean project but that did nothing either. Anyone have an idea here?

This is my svelte.config.ts:

import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
import adapter from '@sveltejs/adapter-static';

/** @type {import('@sveltejs/kit').Config} */
const config = {
    // Consult https://kit.svelte.dev/docs/integrations#preprocessors
    // for more information about preprocessors
    preprocess: [vitePreprocess({ script: true })],

    kit: {
        adapter: adapter(),
        prerender: {
            // Optionally specify which pages to prerender or not
            entries: ['*'] // This will prerender all routes, which is useful for static sites
        }
    }
};

export default config;

and this is my vite.config.ts:

import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vitest/config';

export default defineConfig({
    plugins: [sveltekit()],
    build: {
        target: 'esnext',
    },
    test: {
        include: ['src/**/*.{test,spec}.{js,ts}']
    }
});

and these are my dependencies in package.json:

...
    "devDependencies": {
        "@playwright/test": "^1.28.1",
        "@skeletonlabs/skeleton": "^2.10.3",
        "@skeletonlabs/tw-plugin": "^0.4.0",
        "@sveltejs/adapter-auto": "^3.3.1",
        "@sveltejs/adapter-static": "^3.0.8",
        "@sveltejs/kit": "^2.7.4",
        "@sveltejs/vite-plugin-svelte": "^4.0.0",
        "@tailwindcss/forms": "^0.5.10",
        "@types/d3-scale": "^4.0.8",
        "@types/eslint": "^8.56.0",
        "@types/node": "^20.12.7",
        "@typescript-eslint/eslint-plugin": "^7.0.0",
        "@typescript-eslint/parser": "^7.0.0",
        "autoprefixer": "^10.4.16",
        "chart.js": "^4.0.0",
        "eslint": "^8.56.0",
        "eslint-config-prettier": "^9.1.0",
        "eslint-plugin-svelte": "^2.46.0",
        "postcss": "^8.4.32",
        "postcss-load-config": "^5.0.2",
        "prettier": "^3.1.1",
        "prettier-plugin-svelte": "^3.2.7",
        "prettier-plugin-tailwindcss": "^0.5.9",
        "svelte": "^5",
        "svelte-check": "^3.6.0",
        "svelte-preprocess": "^6.0.3",
        "svelte-transition": "^0.0.17",
        "tailwindcss": "^3.3.6",
        "tslib": "^2.4.1",
        "typescript": "^5.0.0",
        "vite": "^5.4.10",
        "vitest": "^1.2.0"
    },
    "type": "module",
    "dependencies": {
        "chartjs-adapter-date-fns": "^3.0.0",
        "chartjs-plugin-datalabels": "^2.2.0",
        "compute-covariance": "^1.0.1",
        "d3": "^7.9.0",
        "d3-scale": "^4.0.2",
        "firebase": "^11.2.0",
        "mathjs": "^14.0.1",
        "ts-node": "^10.9.2"
    }
...

This seems incredibly dumb to me, but the solution was to rename svelte.config.ts to svelte.config.js. No errors in my terminal made this clear to me, but I found this doc file: https://github.com/sveltejs/vite-plugin-svelte/blob/main/docs/config.md#config-file-resolving. Annoyingly, the sveltekit plugin for Vite doesn't allow you specify the config file (but the svelte plugin, which sveltekit wraps, does have this option). Seems like a massive oversight by the devs here.