text: import { write_if_changed } from './utils.js';
  
  /**
   * @param {import('types').ValidatedConfig} config
   * @param {import('types').ManifestData} manifest_data
   */
  export function write_types(config, manifest_data) {
  	/** @type {Map<string, { params: string[], type: 'page' | 'endpoint' | 'both' }>} */
  	const shadow_types = new Map();
  
  	/** @param {string} key */
  	function extract_params(key) {
  		/** @type {string[]} */
  		const params = [];
  
  		const pattern = /\[([^\]]+)\]/g;
  		let match;
  
  		while ((match = pattern.exec(key))) {
  			params.push(match[1]);
  		}
  
  		return params;
  	}
  
  	manifest_data.routes.forEach((route) => {
  		const file = route.type === 'endpoint' ? route.file : route.shadow;
  
  		if (file) {
  			const ext = /** @type {string} */ (
  				config.kit.endpointExtensions.find((ext) => file.endsWith(ext))
  			);
  			const key = file.slice(0, -ext.length);
  			shadow_types.set(key, {
  				params: extract_params(key),
  				type: route.type === 'endpoint' ? 'endpoint' : 'both'
  			});
  		}
  	});
  
  	manifest_data.components.forEach((component) => {
  		if (component.startsWith('.')) return; // exclude fallback components
  
  		const ext = /** @type {string} */ (config.extensions.find((ext) => component.endsWith(ext)));
  		const key = component.slice(0, -ext.length);
  
  		if (!shadow_types.has(key)) {
  			shadow_types.set(key, { params: extract_params(key), type: 'page' });
  		}
  	});
  
  	shadow_types.forEach(({ params, type }, key) => {
  		const arg =
  			params.length > 0 ? `{ ${params.map((param) => `${param}: string`).join('; ')} }` : '{}';
  
  		const imports = [
  			type !== 'page' && 'RequestHandler as GenericRequestHandler',
  			type !== 'endpoint' && 'Load as GenericLoad'
  		]
  			.filter(Boolean)
  			.join(', ');
  
  		const file = `${config.kit.outDir}/types/${key || 'index'}.d.ts`;
  		const content = [
  			'// this file is auto-generated',
  			`import type { ${imports} } from '@sveltejs/kit';`,
  			type !== 'page' && `export type RequestHandler = GenericRequestHandler<${arg}>;`,
  			type !== 'endpoint' &&
  				`export type Load<Props = Record<string, any>> = GenericLoad<${arg}, Props>;`
  		]
  			.filter(Boolean)
  			.join('\n');
  
  		write_if_changed(file, content);
  	});
  }
  