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import { promises as fs } from 'node:fs';
import path from 'node:path';
// List of options that changes the prebundling result
/** @type {(keyof import('../types/options.d.ts').ResolvedOptions)[]} */
const PREBUNDLE_SENSITIVE_OPTIONS = [
'compilerOptions',
'configFile',
'experimental',
'extensions',
'ignorePluginPreprocessors',
'preprocess'
];
/**
* @param {string} cacheDir
* @param {import('../types/options.d.ts').ResolvedOptions} options
* @returns {Promise<boolean>} Whether the Svelte metadata has changed
*/
export async function saveSvelteMetadata(cacheDir, options) {
const svelteMetadata = generateSvelteMetadata(options);
const svelteMetadataPath = path.resolve(cacheDir, '_svelte_metadata.json');
const currentSvelteMetadata = JSON.stringify(svelteMetadata, (_, value) => {
// Handle preprocessors
return typeof value === 'function' ? value.toString() : value;
});
/** @type {string | undefined} */
let existingSvelteMetadata;
try {
existingSvelteMetadata = await fs.readFile(svelteMetadataPath, 'utf8');
} catch {
// ignore
}
await fs.mkdir(cacheDir, { recursive: true });
await fs.writeFile(svelteMetadataPath, currentSvelteMetadata);
return currentSvelteMetadata !== existingSvelteMetadata;
}
/**
* @param {import('../types/options.d.ts').ResolvedOptions} options
* @returns {Partial<import('../types/options.d.ts').ResolvedOptions>}
*/
function generateSvelteMetadata(options) {
/** @type {Record<string, any>} */
const metadata = {};
for (const key of PREBUNDLE_SENSITIVE_OPTIONS) {
metadata[key] = options[key];
}
return metadata;
}
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