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import { createRedirectsFromAstroRoutes } from '@astrojs/underscore-redirects';
import type { AstroConfig, RouteData } from 'astro';
import fs from 'node:fs';
export async function createRedirects(
config: AstroConfig,
routes: RouteData[],
dir: URL,
entryFile: string,
type: 'functions' | 'edge-functions' | 'builders' | 'static'
) {
const kind = type ?? 'functions';
const dynamicTarget = `/.netlify/${kind}/${entryFile}`;
const _redirectsURL = new URL('./_redirects', dir);
const _redirects = createRedirectsFromAstroRoutes({
config,
routes,
dir,
dynamicTarget,
});
const content = _redirects.print();
// Always use appendFile() because the redirects file could already exist,
// e.g. due to a `/public/_redirects` file that got copied to the output dir.
// If the file does not exist yet, appendFile() automatically creates it.
await fs.promises.appendFile(_redirectsURL, content, 'utf-8');
}
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