type assertion in module script (#966)

Author: jasonlyu123

packages/svelte2tsx/src/svelte2tsx/processModuleScriptTag.ts

@@ -2,6 +2,7 @@ import MagicString from 'magic-string';
 import { Node } from 'estree-walker';
 import ts from 'typescript';
 import { ImplicitStoreValues } from './nodes/ImplicitStoreValues';
+import { handleTypeAssertion } from './nodes/handleTypeAssertion';
 
 export function processModuleScriptTag(
     str: MagicString,
@@ -47,6 +48,10 @@ function resolveImplicitStores(
             implicitStoreValues.addImportStatement(node);
         }
 
+        if (ts.isTypeAssertionExpression?.(node)) {
+            handleTypeAssertion(str, node, astOffset);
+        }
+
         ts.forEachChild(node, (n) => walk(n));
     };
 

packages/svelte2tsx/test/svelte2tsx/samples/ts-type-assertion/expected.tsx

@@ -1,9 +1,13 @@
 ///<reference types="svelte" />
-<></>;function render() {
+<></>;
+    let a = '' as string;
+;<></>;function render() {
 
     let a = document.querySelector('#id') as HTMLInputElement;
 ;
-() => (<></>);
+() => (<>
+
+</>);
 return { props: {}, slots: {}, getters: {}, events: {} }}
 
 export default class Input__SvelteComponent_ extends createSvelte2TsxComponent(__sveltets_partial_ts(__sveltets_with_any_event(render))) {

packages/svelte2tsx/test/svelte2tsx/samples/ts-type-assertion/input.svelte

@@ -1,3 +1,7 @@
-<script>
+<script lang="ts" context="module">
+    let a = <string>'';
+</script>
+
+<script lang="ts" >
     let a = <HTMLInputElement>document.querySelector('#id');
 </script>