support transformation of symbol

Author: franzbecker

src/transform.ts

@@ -277,6 +277,11 @@ export const transform = {
       path.replaceWith(t.tsArrayType(elementType));
     },
   },
+  SymbolTypeAnnotation: {
+    exit(path) {
+      path.replaceWith(t.tsSymbolKeyword());
+    },
+  },
   TupleTypeAnnotation: {
     exit(path) {
       const { types } = path.node;

test/fixtures/convert/basic-types/symbol01/flow.js

@@ -0,0 +1 @@
+let a: symbol;

test/fixtures/convert/basic-types/symbol01/ts.js

@@ -0,0 +1 @@
+let a: symbol;

test/fixtures/convert/intersection-union/union02/flow.js

@@ -0,0 +1 @@
+let obj: string | symbol;

test/fixtures/convert/intersection-union/union02/ts.js

@@ -0,0 +1 @@
+let obj: string | symbol;