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perf: cache files during emitDts #2701

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merged 1 commit into from
Mar 6, 2025
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perf: cache files during emitDts #2701

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12 changes: 9 additions & 3 deletions packages/svelte2tsx/src/emitDts.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -277,7 +277,7 @@ interface SvelteMap {
* those transformed source later on.
*/
async function createSvelteMap(config: EmitDtsConfig): Promise<SvelteMap> {
const svelteFiles = new Map();
const svelteFiles = new Map<string, { transformed: string; isTsFile: boolean }>();

// TODO detect Svelte version in here and set shimsPath accordingly if not given from above
const noSvelteComponentTyped = config.svelteShimsPath
Expand All @@ -286,6 +286,12 @@ async function createSvelteMap(config: EmitDtsConfig): Promise<SvelteMap> {
const version = noSvelteComponentTyped ? undefined : '3.42.0';

function add(path: string): boolean {
const normalizedPath = path.replace(/\\/g, '/');

if (svelteFiles.has(normalizedPath)) {
return svelteFiles.get(normalizedPath)!.isTsFile;
}

const code = ts.sys.readFile(path, 'utf-8');
const isTsFile = /<script\s+[^>]*?lang=('|")(ts|typescript)('|")/.test(code);
const transformed = svelte2tsx(code, {
Expand All @@ -295,13 +301,13 @@ async function createSvelteMap(config: EmitDtsConfig): Promise<SvelteMap> {
version,
noSvelteComponentTyped: noSvelteComponentTyped
}).code;
svelteFiles.set(path.replace(/\\/g, '/'), transformed);
svelteFiles.set(normalizedPath, { transformed, isTsFile });
return isTsFile;
}

return {
add,
get: (key: string) => svelteFiles.get(key.replace(/\\/g, '/'))
get: (key: string) => svelteFiles.get(key.replace(/\\/g, '/'))?.transformed
};
}

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