(chore) add svelte-check smoketest (#1090)

to hopefully catch build hickups
#1089

Author: dummdidumm

packages/svelte-check/.npmignore

@@ -1,4 +1,5 @@
 /node_modules
 /src
+/test
 tsconfig.json
 rollup.config.js

packages/svelte-check/package.json

@@ -33,7 +33,7 @@
         "svelte": "^3.24.0"
     },
     "scripts": {
-        "build": "rollup -c",
+        "build": "rollup -c && node ./dist/src/index.js --workspace ./test --tsconfig ./tsconfig.json",
         "prepublishOnly": "npm run build",
         "test": "echo 'NOOP'"
     },

packages/svelte-check/test/Index.svelte

@@ -0,0 +1,6 @@
+<script>
+    const a = true;
+    a === true;
+</script>
+
+{a}

packages/svelte-check/test/tsconfig.json

@@ -0,0 +1,10 @@
+{
+    "extends": "@tsconfig/node12/tsconfig.json",
+    "compilerOptions": {
+        "moduleResolution": "node",
+        "strict": true,
+        "allowJs": true,
+        "checkJs": true
+    },
+    "files": ["./Index.svelte"]
+}