1 files changed, 55 insertions, 0 deletions
diff --git a/packages/astro/src/i18n/vite-plugin-i18n.ts b/packages/astro/src/i18n/vite-plugin-i18n.ts
new file mode 100644
index 000000000..11a1177c6
--- /dev/null
+++ b/packages/astro/src/i18n/vite-plugin-i18n.ts
@@ -0,0 +1,55 @@
+import type * as vite from 'vite';
+import { AstroError } from '../core/errors/errors.js';
+import { AstroErrorData } from '../core/errors/index.js';
+import type { AstroSettings } from '../types/astro.js';
+import type { AstroConfig } from '../types/public/config.js';
+
+const virtualModuleId = 'astro:i18n';
+
+type AstroInternationalization = {
+	settings: AstroSettings;
+};
+
+export interface I18nInternalConfig
+	extends Pick<AstroConfig, 'base' | 'site' | 'trailingSlash'>,
+		Pick<AstroConfig['build'], 'format'> {
+	i18n: AstroConfig['i18n'];
+	isBuild: boolean;
+}
+
+export default function astroInternationalization({
+	settings,
+}: AstroInternationalization): vite.Plugin {
+	const {
+		base,
+		build: { format },
+		i18n,
+		site,
+		trailingSlash,
+	} = settings.config;
+	return {
+		name: 'astro:i18n',
+		enforce: 'pre',
+		config(_config, { command }) {
+			const i18nConfig: I18nInternalConfig = {
+				base,
+				format,
+				site,
+				trailingSlash,
+				i18n,
+				isBuild: command === 'build',
+			};
+			return {
+				define: {
+					__ASTRO_INTERNAL_I18N_CONFIG__: JSON.stringify(i18nConfig),
+				},
+			};
+		},
+		resolveId(id) {
+			if (id === virtualModuleId) {
+				if (i18n === undefined) throw new AstroError(AstroErrorData.i18nNotEnabled);
+				return this.resolve('astro/virtual-modules/i18n.js');
+			}
+		},
+	};
+}