fix: handle svelte.ts/js files when emitting types

#2241

packages/svelte2tsx/src/emitDts.ts

@@ -102,8 +102,17 @@ async function createTsCompilerHost(options: any, svelteMap: SvelteMap) {
  const svelteSys: ts.System = {
  ...ts.sys,
  fileExists(originalPath) {
+ let exists = ts.sys.fileExists(originalPath);
+ if (exists) {
+ return true;
+ }
+
  const path = ensureRealSvelteFilepath(originalPath);
- const exists = ts.sys.fileExists(path);
+ if (path === originalPath) {
+ return false;
+ }
+
+ exists = ts.sys.fileExists(path);
  if (exists && isSvelteFilepath(path)) {
  const isTsFile = svelteMap.add(path);
  if (
@@ -116,9 +125,14 @@ async function createTsCompilerHost(options: any, svelteMap: SvelteMap) {
  return exists;
  },
  readFile(path, encoding = 'utf-8') {
- if (isVirtualSvelteFilepath(path) || isSvelteFilepath(path)) {
- path = ensureRealSvelteFilepath(path);
- return svelteMap.get(path);
+ const sveltePath = ensureRealSvelteFilepath(path);
+ if (path !== sveltePath || isSvelteFilepath(path)) {
+ const result = svelteMap.get(sveltePath);
+ if (result === undefined) {
+ return ts.sys.readFile(path, encoding);
+ } else {
+ return result;
+ }
  } else {
  return ts.sys.readFile(path, encoding);
  }

packages/svelte2tsx/test/emitDts/samples/javascript/expected/runes.svelte.d.ts

@@ -0,0 +1 @@
+export const x: true;

packages/svelte2tsx/test/emitDts/samples/javascript/src/runes.svelte.js

@@ -0,0 +1 @@
+export const x = true;

packages/svelte2tsx/test/emitDts/samples/typescript/expected/runes.svelte.d.ts

@@ -0,0 +1 @@
+export declare const x = true;

packages/svelte2tsx/test/emitDts/samples/typescript/src/runes.svelte.ts

@@ -0,0 +1 @@
+export const x = true;