Issues calling server/ts function in API route

Error importing route file: Error: Invariant failed: createServerFn must be called with a function that is marked with the 'use server' pragma. Are you using the @tanstack/start-vite-plugin ?
    at invariant (file:///Users/am/Coding/code/node_modules/tiny-invariant/dist/esm/tiny-invariant.js:12:11)
    at Object.handler (/Users/am/Coding/code/node_modules/@tanstack/start/dist/esm/client/createServerFn.js:37:40)
    at eval (/Users/am/Coding/code/src/web/features/files/functions.ts:63:3)
    at async ESModulesEvaluator.runInlinedModule (file:///Users/am/Coding/code/node_modules/vite/dist/node/module-runner.js:1053:5)
    at async SSRCompatModuleRunner.directRequest (file:///Users/am/Coding/code/node_modules/vite/dist/node/module-runner.js:1279:61)
    at async SSRCompatModuleRunner.directRequest (file:///Users/am/Coding/code/node_modules/vite/dist/node/chunks/dep-yUJfKD1i.js:30612:23)
    at async SSRCompatModuleRunner.cachedRequest (file:///Users/am/Coding/code/node_modules/vite/dist/node/module-runner.js:1174:76)
    at async eval (/Users/am/Coding/code/src/web/routes/api/upload.ts?pick=APIRoute:6:31)

export async function upsertDealFile(db: DbTx, dealFile: DealFilesInsert) {
    const [newDealFile] = await upsertRecord(
        db,
        dealFiles,
        dealFile,
        [dealFiles.dealId, dealFiles.fileId],
        ['dealId', 'fileId', 'id', 'shortId'],
    )
    return newDealFile
}