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import type { AstroConfig } from './@types/astro';
import { join as pathJoin, resolve as pathResolve } from 'path';
import { existsSync } from 'fs';
/** Type util */
const type = (thing: any): string => (Array.isArray(thing) ? 'Array' : typeof thing);
/** Throws error if a user provided an invalid config. Manually-implemented to avoid a heavy validation library. */
function validateConfig(config: any): void {
// basic
if (config === undefined || config === null) throw new Error(`[astro config] Config empty!`);
if (typeof config !== 'object') throw new Error(`[astro config] Expected object, received ${typeof config}`);
// strings
for (const key of ['projectRoot', 'astroRoot', 'dist', 'public']) {
if (config[key] && typeof config[key] !== 'string') {
throw new Error(`[astro config] ${key}: ${JSON.stringify(config[key])}\n Expected string, received ${type(config[key])}.`);
}
}
}
/** Set default config values */
function configDefaults(userConfig?: any): any {
const config: any = { ...(userConfig || {}) };
if (!config.projectRoot) config.projectRoot = '.';
if (!config.astroRoot) config.astroRoot = './astro';
if (!config.dist) config.dist = './_site';
if (!config.public) config.public = './public';
return config;
}
/** Turn raw config values into normalized values */
function normalizeConfig(userConfig: any, root: string): AstroConfig {
const config: any = { ...(userConfig || {}) };
config.projectRoot = new URL(config.projectRoot + '/', root);
config.astroRoot = new URL(config.astroRoot + '/', root);
config.public = new URL(config.public + '/', root);
return config as AstroConfig;
}
/** Attempt to load an `astro.config.mjs` file */
export async function loadConfig(rawRoot: string | undefined): Promise<AstroConfig> {
if (typeof rawRoot === 'undefined') {
rawRoot = process.cwd();
}
let config: any;
const root = pathResolve(rawRoot);
const fileProtocolRoot = `file://${root}/`;
const astroConfigPath = pathJoin(root, 'astro.config.mjs');
// load
if (existsSync(astroConfigPath)) {
config = configDefaults((await import(astroConfigPath)).default);
} else {
config = configDefaults();
}
// validate
validateConfig(config);
// normalize
config = normalizeConfig(config, fileProtocolRoot);
return config as AstroConfig;
}
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