middleware() — astro Function Reference

Architecture documentation for the middleware() function in i18n.ts from the astro codebase.

Function typescript CoreAstro RenderingEngine

Entity Profile

CoreAstro→ RenderingEngine→ middleware() — astro Function Reference

Dependency Diagram

graph TD
  3d6f48d1_58f8_07a7_d0a5_56ede30ca4d8["middleware()"]
  113cc879_696f_ac71_941f_004a5fb4282c["i18n.ts"]
  3d6f48d1_58f8_07a7_d0a5_56ede30ca4d8 -->|defined in| 113cc879_696f_ac71_941f_004a5fb4282c
  style 3d6f48d1_58f8_07a7_d0a5_56ede30ca4d8 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/astro/src/virtual-modules/i18n.ts lines 392–411

	middleware = (customOptions) => {
		if (
			customOptions.prefixDefaultLocale === false &&
			// @ts-expect-error types do not allow this but we also check at runtime
			customOptions.redirectToDefaultLocale === true
		) {
			throw new AstroError(InvalidI18nMiddlewareConfiguration);
		}
		strategy = toRoutingStrategy(customOptions, {});
		fallbackType = toFallbackType(customOptions);
		const manifest: SSRManifest['i18n'] = {
			...i18n,
			strategy,
			domainLookupTable: {},
			fallbackType,
			fallback: i18n.fallback,
			domains: i18n.domains,
		};
		return I18nInternals.createMiddleware(manifest, base, trailingSlash, format);
	};