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* Builds the API bundle for preview/production
* Scans apiDir, generates an entry module, bundles with esbuild
*/
import * as path from 'path';
import * as fs from 'fs';
import { scanApiDirectory } from '../core/file-system/scan-api-dir.js';
import { patternToRegex } from '../core/normalize/normalize-path.js';
import type { ParsedRoute } from '../core/routing/route-parser.js';
import type { MiddlewareInfo } from '../core/file-system/scan-api-dir.js';
const VITEK_API_BUNDLE_FILENAME = 'vitek-api.mjs';
export interface BuildApiBundleOptions {
root: string;
apiDir: string;
outDir: string;
alias?: Record<string, string>;
}
/**
* Generates the virtual entry file content that imports all route handlers and middlewares
* and exports { routes, middlewares } in the shape expected by createRequestHandler
* entryDir: directory of the generated entry file (for relative imports)
*/
function generateEntryContent(
scanResult: { routes: ParsedRoute[]; middlewares: MiddlewareInfo[] },
entryDir: string
): string {
const lines: string[] = [];
scanResult.routes.forEach((parsed, i) => {
const rel = path.relative(entryDir, parsed.file).replace(/\\/g, '/');
const importPath = rel.startsWith('.') ? rel : `./${rel}`;
lines.push(`import handler_${i} from ${JSON.stringify(importPath)};`);
});
scanResult.middlewares.forEach((mw, i) => {
const rel = path.relative(entryDir, mw.path).replace(/\\/g, '/');
const importPath = rel.startsWith('.') ? rel : `./${rel}`;
// Use namespace import so we can read both default and named export 'config' (for global pathPatterns)
lines.push(`import * as mw_${i}_ns from ${JSON.stringify(importPath)};`);
});
const routeEntries = scanResult.routes.map((parsed, i) => {
const regex = patternToRegex(parsed.pattern);
const regexSource = regex.source;
return ` { pattern: ${JSON.stringify(parsed.pattern)}, method: ${JSON.stringify(parsed.method)}, params: ${JSON.stringify(parsed.params)}, file: ${JSON.stringify(parsed.file)}, regex: new RegExp(${JSON.stringify(regexSource)}), handler: (() => { const m = handler_${i}; return typeof m === 'function' ? m : (m.default ?? m.handler ?? m[${JSON.stringify(parsed.method)}]); })() }`;
});
lines.push('');
lines.push('const routes = [');
lines.push(routeEntries.join(',\n'));
lines.push('];');
const mwEntries = scanResult.middlewares.map((mw, i) => {
const base = ` { basePattern: ${JSON.stringify(mw.basePattern)}, middleware: (() => { const m = mw_${i}_ns.default ?? mw_${i}_ns; const fn = typeof m === 'function' || Array.isArray(m) ? m : (m?.default ?? m?.middleware); return Array.isArray(fn) ? fn : [fn]; })()`;
if (mw.basePattern === '') {
return `${base}, pathPatterns: (() => { const c = mw_${i}_ns?.config; if (!c?.path) return undefined; const p = Array.isArray(c.path) ? c.path : [c.path]; return p.map((x) => String(x).replace(/^\\/api\\/?/, '').replace(/^\\/+|\\/+$/g, '')); })() }`;
}
return `${base} }`;
});
lines.push('');
lines.push('const middlewares = [');
lines.push(mwEntries.join(',\n'));
lines.push('];');
lines.push('');
lines.push('export { routes, middlewares };');
return lines.join('\n');
}
function createAliasPlugin(root: string, alias: Record<string, string>): { name: string; setup: (build: unknown) => void } {
const entries = Object.entries(alias)
.filter(([, v]) => v != null && v !== '')
.sort(([a], [b]) => b.length - a.length);
return {
name: 'vitek-alias',
setup(build: unknown) {
Iif (entries.length === 0) return;
const b = build as { onResolve: (opts: { filter: RegExp }, fn: (args: { path: string }) => { path: string } | null) => void };
const filter = new RegExp('^(' + entries.map(([k]) => k.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')).join('|') + ')(/|$)');
b.onResolve({ filter }, (args) => {
const imp = args.path;
for (const [key, value] of entries) {
Eif (imp === key || imp.startsWith(key + '/')) {
const rest = imp.slice(key.length).replace(/^\//, '') || '';
const base = path.resolve(root, value, rest);
const withExt = ['.js', '.ts', '.mjs', '.cjs'].find((ext) => fs.existsSync(base + ext));
const resolved = withExt ? base + withExt : base;
return { path: resolved };
}
}
return null;
});
},
};
}
/**
* Builds the API bundle and writes it to outDir/vitek-api.mjs
* Returns the path to the written file, or null if skipped (no apiDir, no routes, or error)
*/
export async function buildApiBundle(options: BuildApiBundleOptions): Promise<string | null> {
const { root, apiDir, outDir, alias } = options;
if (!fs.existsSync(apiDir)) {
return null;
}
const scanResult = scanApiDirectory(apiDir);
if (scanResult.routes.length === 0 && scanResult.middlewares.length === 0) {
return null;
}
const tmpDir = path.join(outDir, '.vitek-tmp');
Eif (!fs.existsSync(tmpDir)) {
fs.mkdirSync(tmpDir, { recursive: true });
}
const tmpEntry = path.join(tmpDir, 'vitek-api-entry.mts');
const entryContent = generateEntryContent(scanResult, path.dirname(tmpEntry));
fs.writeFileSync(tmpEntry, entryContent, 'utf-8');
const outFile = path.join(outDir, VITEK_API_BUNDLE_FILENAME);
const esbuild = (await import('esbuild').catch(() => null)) as {
build: (opts: unknown) => Promise<void>;
} | null;
Iif (!esbuild) {
return null;
}
const plugins = alias && Object.keys(alias).length > 0 ? [createAliasPlugin(root, alias)] : [];
try {
await esbuild.build({
entryPoints: [tmpEntry],
bundle: true,
format: 'esm',
platform: 'node',
outfile: outFile,
external: ['vitek-plugin'],
minify: true,
plugins,
});
return outFile;
} finally {
try {
fs.unlinkSync(tmpEntry);
Eif (fs.readdirSync(tmpDir).length === 0) {
fs.rmdirSync(tmpDir);
}
} catch {
}
}
}
export function getApiBundleFilename(): string {
return VITEK_API_BUNDLE_FILENAME;
}
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