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import { nodeFileTrace } from '@vercel/nft';
import * as fs from 'node:fs/promises';
import nodePath from 'node:path';
import { fileURLToPath } from 'node:url';
export async function copyDependenciesToFunction(
entry: URL,
outDir: URL
): Promise<{ handler: string }> {
const entryPath = fileURLToPath(entry);
// Get root of folder of the system (like C:\ on Windows or / on Linux)
let base = entry;
while (fileURLToPath(base) !== fileURLToPath(new URL('../', base))) {
base = new URL('../', base);
}
const result = await nodeFileTrace([entryPath], {
base: fileURLToPath(base),
});
if (result.fileList.size === 0) throw new Error('[@astrojs/vercel] No files found');
for (const error of result.warnings) {
if (error.message.startsWith('Failed to resolve dependency')) {
const [, module, file] = /Cannot find module '(.+?)' loaded from (.+)/.exec(error.message)!;
// The import(astroRemark) sometimes fails to resolve, but it's not a problem
if (module === '@astrojs/') continue;
if (entryPath === file) {
console.warn(
`[@astrojs/vercel] The module "${module}" couldn't be resolved. This may not be a problem, but it's worth checking.`
);
} else {
console.warn(
`[@astrojs/vercel] The module "${module}" inside the file "${file}" couldn't be resolved. This may not be a problem, but it's worth checking.`
);
}
} else {
throw error;
}
}
const fileList = [...result.fileList];
let commonAncestor = nodePath.dirname(fileList[0]);
for (const file of fileList.slice(1)) {
while (!file.startsWith(commonAncestor)) {
commonAncestor = nodePath.dirname(commonAncestor);
}
}
for (const file of fileList) {
const origin = new URL(file, base);
const dest = new URL(nodePath.relative(commonAncestor, file), outDir);
const realpath = await fs.realpath(origin);
const isSymlink = realpath !== fileURLToPath(origin);
const isDir = (await fs.stat(origin)).isDirectory();
// Create directories recursively
if (isDir && !isSymlink) {
await fs.mkdir(new URL('..', dest), { recursive: true });
} else {
await fs.mkdir(new URL('.', dest), { recursive: true });
}
if (isSymlink) {
const realdest = fileURLToPath(
new URL(
nodePath.relative(nodePath.join(fileURLToPath(base), commonAncestor), realpath),
outDir
)
);
await fs.symlink(
nodePath.relative(fileURLToPath(new URL('.', dest)), realdest),
dest,
isDir ? 'dir' : 'file'
);
} else if (!isDir) {
await fs.copyFile(origin, dest);
}
}
return {
// serverEntry location inside the outDir
handler: nodePath.relative(nodePath.join(fileURLToPath(base), commonAncestor), entryPath),
};
}
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