New: Support Definite Assignment (Fixes eslint#424)

Author: azz

lib/convert.js

@@ -658,6 +658,10 @@ module.exports = function convert(config) {
                 init: convertChild(node.initializer)
             });
 
+            if (node.exclamationToken) {
+                result.exclamationToken = true;
+            }
+
             if (node.type) {
                 result.id.typeAnnotation = convertTypeAnnotation(node.type);
                 fixTypeAnnotationParentLocation(result.id);
@@ -859,6 +863,10 @@ module.exports = function convert(config) {
                 result.key.optional = true;
             }
 
+            if (node.exclamationToken) {
+                result.exclamationToken = true;
+            }
+
             if (result.key.type === AST_NODE_TYPES.Literal && node.questionToken) {
                 result.optional = true;
             }

package.json

@@ -31,7 +31,7 @@
     "npm-license": "0.3.3",
     "shelljs": "0.7.8",
     "shelljs-nodecli": "0.1.1",
-    "typescript": "~2.6.1"
+    "typescript": "^2.7.0-insiders.20180108"
   },
   "keywords": [
     "ast",

tests/fixtures/typescript/basics/class-with-definite-assignment.src.ts

@@ -0,0 +1,3 @@
+class X {
+  a!: string;
+}

tests/fixtures/typescript/basics/var-with-definite-assignment.src.ts

@@ -0,0 +1,3 @@
+const x!: string;
+var y!: number;
+let z!: object;