fix: do not override process.env

.changeset/real-actors-jog.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fixes a case where environment variables would not be refreshed when using `astro:env`

packages/astro/src/env/constants.ts

@@ -10,3 +10,5 @@ export const ENV_TYPES_FILE = 'env.d.ts';
 const PKG_BASE = new URL('../../', import.meta.url);
 export const MODULE_TEMPLATE_URL = new URL('templates/env/module.mjs', PKG_BASE);
 export const TYPES_TEMPLATE_URL = new URL('templates/env/types.d.ts', PKG_BASE);
+
+export const ENV_SYMBOL = Symbol.for('astro:env/dev');

packages/astro/src/env/runtime.ts

@@ -1,12 +1,16 @@
 import { AstroError, AstroErrorData } from '../core/errors/index.js';
+import { ENV_SYMBOL } from './constants.js';
 import { invalidVariablesToError } from './errors.js';
 import type { ValidationResultInvalid } from './validators.js';
 export { validateEnvVariable, getEnvFieldType } from './validators.js';
 
 export type GetEnv = (key: string) => string | undefined;
 type OnSetGetEnv = (reset: boolean) => void;
 
-let _getEnv: GetEnv = (key) => process.env[key];
+let _getEnv: GetEnv = (key) => {
+	const env = (globalThis as any)[ENV_SYMBOL] ?? {};
+	return env[key];
+};
 
 export function setGetEnv(fn: GetEnv, reset = false) {
 	_getEnv = fn;

packages/astro/src/env/vite-plugin-env.ts

@@ -4,6 +4,7 @@ import { type Plugin, loadEnv } from 'vite';
 import type { AstroSettings } from '../@types/astro.js';
 import { AstroError, AstroErrorData } from '../core/errors/index.js';
 import {
+	ENV_SYMBOL,
 	MODULE_TEMPLATE_URL,
 	VIRTUAL_MODULES_IDS,
 	VIRTUAL_MODULES_IDS_VALUES,
@@ -47,11 +48,7 @@ export function astroEnv({
 				fileURLToPath(settings.config.root),
 				'',
 			);
-			for (const [key, value] of Object.entries(loadedEnv)) {
-				if (value !== undefined) {
-					process.env[key] = value;
-				}
-			}
+			(globalThis as any)[ENV_SYMBOL] ??= loadedEnv;
 
 			const validatedVariables = validatePublicVariables({
 				schema,