feat: add support

.changeset/hot-buses-suffer.md

@@ -0,0 +1,5 @@
+---
+"@marko/language-tools": patch
+---
+
+Add typeings for $signal variable in tags api.

packages/language-server/src/__tests__/fixtures/script/abort-signal/__snapshots__/abort-signal.expected/index.md

@@ -0,0 +1,21 @@
+## Hovers
+### Ln 2, Col 4
+```marko
+  1 | <effect() {
+> 2 |   $signal.onabort = () => {
+    |    ^ const $signal: AbortSignal
+  3 | // ^?
+  4 |     console.log('aborted');
+  5 |   };
+```
+
+## Diagnostics
+### Ln 1, Col 2
+```marko
+> 1 | <effect() {
+    |  ^^^^^^ Cannot find name 'effect'.
+  2 |   $signal.onabort = () => {
+  3 | // ^?
+  4 |     console.log('aborted');
+```
+

packages/language-server/src/__tests__/fixtures/script/abort-signal/index.marko

@@ -0,0 +1,6 @@
+<effect() {
+  $signal.onabort = () => {
+// ^?
+    console.log('aborted');
+  };
+}/>

packages/language-tools/src/extractors/script/index.ts

@@ -310,6 +310,7 @@ function ${templateName}() {\n`);
   const input = ${this.#getCastedType(`Input${typeArgsStr}`)};
   const component = ${this.#getCastedType(`Component${typeArgsStr}`)};
   const state = ${varShared("state")}(component);
+  const $signal = ${this.#getCastedType("AbortSignal")};
   const $global = ${varShared("getGlobal")}(
     // @ts-expect-error We expect the compiler to error because we are checking if the MarkoRun.Context is defined.
     (${varShared("error")}, ${this.#getCastedType("MarkoRun.Context")})