astro/dist/i18n/middleware.js

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

import { getFetchStateFromAPIContext } from "../core/fetch/fetch-state.js";
import { compileI18n, finalizeI18n } from "../core/i18n/handler.js";
/**
* Builds a `MiddlewareHandler` that post-processes the rendered response
* against the given i18n configuration. This is a thin wrapper around
* `core/i18n/handler.ts#finalizeI18n` that preserves the middleware-shaped
* API exposed to users via `astro:i18n.middleware(...)` for the manual
* routing strategy.
*
* Only user middleware goes through this wrapper — `handleRequest`
* invokes `finalizeI18n` directly as an explicit post-processing step.
*/
export function createI18nMiddleware(i18n, base, trailingSlash, format) {
	if (!i18n) return (_, next) => next();
	const compiled = compileI18n(i18n, base, trailingSlash, format);
	return async (context, next) => {
		const response = await next();
		return finalizeI18n(compiled, getFetchStateFromAPIContext(context), response);
	};
}