[ts]Set false to default value of TsTypePredicate.asserts (#12352)

babel · Nov 16, 2020 · a4e4aed · a4e4aed
1 parent 56fd904
commit a4e4aed
Show file tree

Hide file tree

Showing 3 changed files with 6 additions and 3 deletions.
diff --git a/packages/babel-parser/src/plugins/typescript/index.js b/packages/babel-parser/src/plugins/typescript/index.js
@@ -357,6 +357,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       const node: N.TsTypePredicate = this.startNodeAtNode(lhs);
       node.parameterName = lhs;
       node.typeAnnotation = this.tsParseTypeAnnotation(/* eatColon */ false);
+      node.asserts = false;
       return this.finishNode(node, "TSTypePredicate");
     }
 

diff --git a/packages/babel-parser/src/types.js b/packages/babel-parser/src/types.js
@@ -1262,7 +1262,7 @@ export type TsTypePredicate = TsTypeBase & {
   type: "TSTypePredicate",
   parameterName: Identifier | TsThisType,
   typeAnnotation: TsTypeAnnotation,
-  asserts?: boolean,
+  asserts: boolean,
 };
 
 // `typeof` operator

diff --git a/packages/babel-parser/test/fixtures/typescript/class/predicate-types/output.json b/packages/babel-parser/test/fixtures/typescript/class/predicate-types/output.json
@@ -52,7 +52,8 @@
                       "type": "TSStringKeyword",
                       "start":31,"end":37,"loc":{"start":{"line":2,"column":19},"end":{"line":2,"column":25}}
                     }
-                  }
+                  },
+                  "asserts": false
                 }
               },
               "body": {
@@ -92,7 +93,8 @@
                         "type": "TSStringKeyword",
                         "start":66,"end":72,"loc":{"start":{"line":4,"column":22},"end":{"line":4,"column":28}}
                       }
-                    }
+                    },
+                    "asserts": false
                   }
                 },
                 "id": null,