add support for boolean flow literals - fixes #2127

packages/babel/src/generation/generators/flow.js

@@ -26,6 +26,14 @@ export function BooleanTypeAnnotation(node) {
   this.push("bool");
 }
 
+/**
+ * Prints BooleanLiteralTypeAnnotation.
+ */
+
+export function BooleanLiteralTypeAnnotation(node) {
+  this.push(node.value ? "true" : "false");
+}
+
 /**
  * Prints DeclareClass, prints node.
  */

packages/babel/src/types/definitions/flow.js

@@ -13,6 +13,10 @@ define("BooleanTypeAnnotation", {
   aliases: ["Flow", "FlowBaseAnnotation"]
 });
 
+define("BooleanLiteralTypeAnnotation", {
+  aliases: ["Flow"]
+});
+
 define("ClassImplements", {
   visitor: ["id", "typeParameters"],
   aliases: ["Flow"]

packages/babel/test/fixtures/generation/flow/boolean-literal-types/actual.js

@@ -0,0 +1,2 @@
+var foo: true;
+var bar: false;

packages/babel/test/fixtures/generation/flow/boolean-literal-types/expected.js

@@ -0,0 +1,2 @@
+var foo: true;
+var bar: false;

packages/babylon/src/plugins/flow.js

@@ -493,6 +493,11 @@ pp.flowParsePrimaryType = function () {
       this.next();
       return this.finishNode(node, "StringLiteralTypeAnnotation");
 
+    case tt._true: case tt._false:
+      node.value = this.match(tt._true)
+      this.next();
+      return this.finishNode(node, "BooleanLiteralTypeAnnotation");
+
     case tt.num:
       node.rawValue = node.value = this.state.value;
       node.raw = this.input.slice(this.state.start, this.state.end);

packages/babylon/test/fixtures/flow/literal-types/boolean-false/actual.js

@@ -0,0 +1 @@
+var foo: true

packages/babylon/test/fixtures/flow/literal-types/boolean-true/actual.js

@@ -0,0 +1 @@
+var foo: false