diff --git a/packages/babel-parser/src/plugins/flow.js b/packages/babel-parser/src/plugins/flow.js
index 4f574776dc..6382c1f6f3 100644
--- a/packages/babel-parser/src/plugins/flow.js
+++ b/packages/babel-parser/src/plugins/flow.js
@@ -463,7 +463,13 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         } while (this.eat(tt.comma));
       }
 
-      node.body = this.flowParseObjectType(isClass, false, false, isClass);
+      node.body = this.flowParseObjectType({
+        allowStatic: isClass,
+        allowExact: false,
+        allowSpread: false,
+        allowProto: isClass,
+        allowInexact: false,
+      });
     }
 
     flowParseInterfaceExtends(): N.FlowInterfaceExtends {
@@ -656,7 +662,13 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         } while (this.eat(tt.comma));
       }
 
-      node.body = this.flowParseObjectType(false, false, false, false);
+      node.body = this.flowParseObjectType({
+        allowStatic: false,
+        allowExact: false,
+        allowSpread: false,
+        allowProto: false,
+        allowInexact: false,
+      });
 
       return this.finishNode(node, "InterfaceTypeAnnotation");
     }
@@ -754,12 +766,19 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       return this.finishNode(node, "ObjectTypeCallProperty");
     }
 
-    flowParseObjectType(
+    flowParseObjectType({
+      allowStatic,
+      allowExact,
+      allowSpread,
+      allowProto,
+      allowInexact,
+    }: {
       allowStatic: boolean,
       allowExact: boolean,
       allowSpread: boolean,
       allowProto: boolean,
-    ): N.FlowObjectTypeAnnotation {
+      allowInexact: boolean,
+    }): N.FlowObjectTypeAnnotation {
       const oldInType = this.state.inType;
       this.state.inType = true;
 
@@ -772,6 +791,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
 
       let endDelim;
       let exact;
+      let inexact = false;
       if (allowExact && this.match(tt.braceBarL)) {
         this.expect(tt.braceBarL);
         endDelim = tt.braceBarR;
@@ -852,16 +872,21 @@ export default (superClass: Class<Parser>): Class<Parser> =>
             }
           }
 
-          nodeStart.properties.push(
-            this.flowParseObjectTypeProperty(
-              node,
-              isStatic,
-              protoStart,
-              variance,
-              kind,
-              allowSpread,
-            ),
+          const propOrInexact = this.flowParseObjectTypeProperty(
+            node,
+            isStatic,
+            protoStart,
+            variance,
+            kind,
+            allowSpread,
+            allowInexact,
           );
+
+          if (propOrInexact === null) {
+            inexact = true;
+          } else {
+            nodeStart.properties.push(propOrInexact);
+          }
         }
 
         this.flowObjectTypeSemicolon();
@@ -869,6 +894,15 @@ export default (superClass: Class<Parser>): Class<Parser> =>
 
       this.expect(endDelim);
 
+      /* The inexact flag should only be added on ObjectTypeAnnotations that
+       * are not the body of an interface, declare interface, or declare class.
+       * Since spreads are only allowed in objec types, checking that is
+       * sufficient here.
+       */
+      if (allowSpread) {
+        nodeStart.inexact = inexact;
+      }
+
       const out = this.finishNode(nodeStart, "ObjectTypeAnnotation");
 
       this.state.inType = oldInType;
@@ -883,7 +917,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       variance: ?N.FlowVariance,
       kind: string,
       allowSpread: boolean,
-    ): N.FlowObjectTypeProperty | N.FlowObjectTypeSpreadProperty {
+      allowInexact: boolean,
+    ): (N.FlowObjectTypeProperty | N.FlowObjectTypeSpreadProperty) | null {
       if (this.match(tt.ellipsis)) {
         if (!allowSpread) {
           this.unexpected(
@@ -901,8 +936,30 @@ export default (superClass: Class<Parser>): Class<Parser> =>
           );
         }
         this.expect(tt.ellipsis);
-        node.argument = this.flowParseType();
+        const isInexactToken = this.eat(tt.comma) || this.eat(tt.semi);
 
+        if (this.match(tt.braceR)) {
+          if (allowInexact) return null;
+          this.unexpected(
+            null,
+            "Explicit inexact syntax is only allowed inside inexact objects",
+          );
+        }
+
+        if (this.match(tt.braceBarR)) {
+          this.unexpected(
+            null,
+            "Explicit inexact syntax cannot appear inside an explicit exact object type",
+          );
+        }
+
+        if (isInexactToken) {
+          this.unexpected(
+            null,
+            "Explicit inexact syntax must appear at the end of an inexact object",
+          );
+        }
+        node.argument = this.flowParseType();
         return this.finishNode(node, "ObjectTypeSpreadProperty");
       } else {
         node.key = this.flowParseObjectPropertyKey();
@@ -1146,10 +1203,22 @@ export default (superClass: Class<Parser>): Class<Parser> =>
           );
 
         case tt.braceL:
-          return this.flowParseObjectType(false, false, true, false);
+          return this.flowParseObjectType({
+            allowStatic: false,
+            allowExact: false,
+            allowSpread: true,
+            allowProto: false,
+            allowInexact: true,
+          });
 
         case tt.braceBarL:
-          return this.flowParseObjectType(false, true, true, false);
+          return this.flowParseObjectType({
+            allowStatic: false,
+            allowExact: true,
+            allowSpread: true,
+            allowProto: false,
+            allowInexact: false,
+          });
 
         case tt.bracketL:
           return this.flowParseTupleType();
diff --git a/packages/babel-parser/test/fixtures/flow/call-properties/1/output.json b/packages/babel-parser/test/fixtures/flow/call-properties/1/output.json
index f106eb4dc3..41dbc2be10 100644
--- a/packages/babel-parser/test/fixtures/flow/call-properties/1/output.json
+++ b/packages/babel-parser/test/fixtures/flow/call-properties/1/output.json
@@ -156,7 +156,8 @@
                   "properties": [],
                   "indexers": [],
                   "internalSlots": [],
-                  "exact": false
+                  "exact": false,
+                  "inexact": false
                 }
               }
             },
diff --git a/packages/babel-parser/test/fixtures/flow/call-properties/2/output.json b/packages/babel-parser/test/fixtures/flow/call-properties/2/output.json
index bdd238b298..9b2e1c34ab 100644
--- a/packages/babel-parser/test/fixtures/flow/call-properties/2/output.json
+++ b/packages/babel-parser/test/fixtures/flow/call-properties/2/output.json
@@ -156,7 +156,8 @@
                   "properties": [],
                   "indexers": [],
                   "internalSlots": [],
-                  "exact": false
+                  "exact": false,
+                  "inexact": false
                 }
               }
             },
diff --git a/packages/babel-parser/test/fixtures/flow/call-properties/3/output.json b/packages/babel-parser/test/fixtures/flow/call-properties/3/output.json
index b37fa63355..edb622d15e 100644
--- a/packages/babel-parser/test/fixtures/flow/call-properties/3/output.json
+++ b/packages/babel-parser/test/fixtures/flow/call-properties/3/output.json
@@ -308,7 +308,8 @@
                   ],
                   "indexers": [],
                   "internalSlots": [],
-                  "exact": false
+                  "exact": false,
+                  "inexact": false
                 }
               }
             },
diff --git a/packages/babel-parser/test/fixtures/flow/call-properties/4/output.json b/packages/babel-parser/test/fixtures/flow/call-properties/4/output.json
index 6f1b515556..718dab3195 100644
--- a/packages/babel-parser/test/fixtures/flow/call-properties/4/output.json
+++ b/packages/babel-parser/test/fixtures/flow/call-properties/4/output.json
@@ -256,7 +256,8 @@
                   "properties": [],
                   "indexers": [],
                   "internalSlots": [],
-                  "exact": false
+                  "exact": false,
+                  "inexact": false
                 }
               }
             },
diff --git a/packages/babel-parser/test/fixtures/flow/comment/02-type-include/output.json b/packages/babel-parser/test/fixtures/flow/comment/02-type-include/output.json
index 81661e9066..0eb104082d 100644
--- a/packages/babel-parser/test/fixtures/flow/comment/02-type-include/output.json
+++ b/packages/babel-parser/test/fixtures/flow/comment/02-type-include/output.json
@@ -239,7 +239,8 @@
           ],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/comment/03-type-flow-include/output.json b/packages/babel-parser/test/fixtures/flow/comment/03-type-flow-include/output.json
index 3a740e6c1c..5b41ff77f7 100644
--- a/packages/babel-parser/test/fixtures/flow/comment/03-type-flow-include/output.json
+++ b/packages/babel-parser/test/fixtures/flow/comment/03-type-flow-include/output.json
@@ -239,7 +239,8 @@
           ],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/declare-module/10/output.json b/packages/babel-parser/test/fixtures/flow/declare-module/10/output.json
index 563b25f29e..84347d7d56 100644
--- a/packages/babel-parser/test/fixtures/flow/declare-module/10/output.json
+++ b/packages/babel-parser/test/fixtures/flow/declare-module/10/output.json
@@ -146,7 +146,8 @@
             ],
             "indexers": [],
             "internalSlots": [],
-            "exact": false
+            "exact": false,
+            "inexact": false
           }
         }
       }
diff --git a/packages/babel-parser/test/fixtures/flow/declare-module/6/output.json b/packages/babel-parser/test/fixtures/flow/declare-module/6/output.json
index 33f1898db5..e2a2f288cb 100644
--- a/packages/babel-parser/test/fixtures/flow/declare-module/6/output.json
+++ b/packages/babel-parser/test/fixtures/flow/declare-module/6/output.json
@@ -192,7 +192,8 @@
                   ],
                   "indexers": [],
                   "internalSlots": [],
-                  "exact": false
+                  "exact": false,
+                  "inexact": false
                 }
               }
             }
diff --git a/packages/babel-parser/test/fixtures/flow/declare-statements/14/output.json b/packages/babel-parser/test/fixtures/flow/declare-statements/14/output.json
index b34f2531a1..a7b76763db 100644
--- a/packages/babel-parser/test/fixtures/flow/declare-statements/14/output.json
+++ b/packages/babel-parser/test/fixtures/flow/declare-statements/14/output.json
@@ -243,7 +243,8 @@
             }
           ],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/def-site-variance/1/output.json b/packages/babel-parser/test/fixtures/flow/def-site-variance/1/output.json
index 8455526f65..938196ebcd 100644
--- a/packages/babel-parser/test/fixtures/flow/def-site-variance/1/output.json
+++ b/packages/babel-parser/test/fixtures/flow/def-site-variance/1/output.json
@@ -422,7 +422,8 @@
           "properties": [],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects1/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects1/input.js
new file mode 100644
index 0000000000..c3ef0ff532
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects1/input.js
@@ -0,0 +1,4 @@
+//@flow
+declare class A {
+  ...;
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects1/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects1/options.json
new file mode 100644
index 0000000000..c9188366d4
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects1/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Spread operator cannot appear in class or interface definitions (3:2)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects2/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects2/input.js
new file mode 100644
index 0000000000..fcc33d36c0
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects2/input.js
@@ -0,0 +1,5 @@
+//@flow
+declare class B {
+  foo: number;
+  ...;
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects2/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects2/options.json
new file mode 100644
index 0000000000..658f8c4347
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects2/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Spread operator cannot appear in class or interface definitions (4:2)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects3/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects3/input.js
new file mode 100644
index 0000000000..1f5df6b39f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects3/input.js
@@ -0,0 +1,5 @@
+//@flow
+declare class C {
+  ...;
+  foo: number;
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects3/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects3/options.json
new file mode 100644
index 0000000000..c9188366d4
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects3/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Spread operator cannot appear in class or interface definitions (3:2)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects4/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects4/input.js
new file mode 100644
index 0000000000..7d0e44fc00
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects4/input.js
@@ -0,0 +1,6 @@
+//@flow
+declare class D {
+  foo: number;
+  ...;
+  bar: number;
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects4/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects4/options.json
new file mode 100644
index 0000000000..658f8c4347
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects4/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Spread operator cannot appear in class or interface definitions (4:2)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects5/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects5/input.js
new file mode 100644
index 0000000000..938efa8b57
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects5/input.js
@@ -0,0 +1,5 @@
+//@flow
+interface F {
+  foo: number;
+  ...;
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects5/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects5/options.json
new file mode 100644
index 0000000000..658f8c4347
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects5/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Spread operator cannot appear in class or interface definitions (4:2)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects6/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects6/input.js
new file mode 100644
index 0000000000..59c4a399c3
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects6/input.js
@@ -0,0 +1,5 @@
+//@flow
+interface G {
+  ...;
+  foo: number;
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects6/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects6/options.json
new file mode 100644
index 0000000000..c9188366d4
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects6/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Spread operator cannot appear in class or interface definitions (3:2)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects7/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects7/input.js
new file mode 100644
index 0000000000..4dde1fd3b0
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects7/input.js
@@ -0,0 +1,6 @@
+//@flow
+interface H {
+  foo: number;
+  ...;
+  bar: number;
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects7/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects7/options.json
new file mode 100644
index 0000000000..658f8c4347
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_disallowed_in_non_objects7/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Spread operator cannot appear in class or interface definitions (4:2)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_forbidden_in_exact/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_forbidden_in_exact/input.js
new file mode 100644
index 0000000000..289513d4e4
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_forbidden_in_exact/input.js
@@ -0,0 +1,2 @@
+//@flow
+type T = {| foo: number, ... |}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_forbidden_in_exact/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_forbidden_in_exact/options.json
new file mode 100644
index 0000000000..49936ac949
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_forbidden_in_exact/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Explicit inexact syntax cannot appear inside an explicit exact object type (2:29)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_must_appear_last/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_must_appear_last/input.js
new file mode 100644
index 0000000000..93c854cac2
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_must_appear_last/input.js
@@ -0,0 +1,2 @@
+//@flow
+type T = {..., foo: number};
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_must_appear_last/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_must_appear_last/options.json
new file mode 100644
index 0000000000..ebb74417a5
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_must_appear_last/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Explicit inexact syntax must appear at the end of an inexact object (2:15)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object/input.js
new file mode 100644
index 0000000000..2fb3e72495
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object/input.js
@@ -0,0 +1,4 @@
+//@flow
+type T = {...};
+type U = {x: number, ...};
+type V = {x: number, ...V, ...U};
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object/output.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object/output.json
new file mode 100644
index 0000000000..7e32ace815
--- /dev/null
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diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid1/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid1/input.js
new file mode 100644
index 0000000000..84742c4659
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid1/input.js
@@ -0,0 +1,2 @@
+//@flow
+type T = {x: number, ..., y: number};
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid1/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid1/options.json
new file mode 100644
index 0000000000..6d703769bf
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid1/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Explicit inexact syntax must appear at the end of an inexact object (2:26)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid2/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid2/input.js
new file mode 100644
index 0000000000..15e4d01a74
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid2/input.js
@@ -0,0 +1,2 @@
+//@flow
+type U = {x: number, ..., ...};
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid2/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid2/options.json
new file mode 100644
index 0000000000..6d703769bf
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid2/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Explicit inexact syntax must appear at the end of an inexact object (2:26)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid3/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid3/input.js
new file mode 100644
index 0000000000..d9037ecf24
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid3/input.js
@@ -0,0 +1,2 @@
+//@flow
+type V = {x: number, ..., ...X};
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid3/options.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid3/options.json
new file mode 100644
index 0000000000..6d703769bf
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_object_invalid3/options.json
@@ -0,0 +1,5 @@
+{
+  "sourceType": "module",
+  "plugins": ["jsx", "flow"],
+  "throws": "Explicit inexact syntax must appear at the end of an inexact object (2:26)"
+}
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_trailing_comma/input.js b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_trailing_comma/input.js
new file mode 100644
index 0000000000..2b439cf934
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_trailing_comma/input.js
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+//@flow
+type T = { ..., };
+type U = { ...; };
+type V = {
+  x: number,
+  ...,
+};
+type W = {
+  x: number;
+  ...;
+};
diff --git a/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_trailing_comma/output.json b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_trailing_comma/output.json
new file mode 100644
index 0000000000..3c39bdc107
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/explicit-inexact-object/explicit_inexact_trailing_comma/output.json
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+        "end": {
+          "line": 1,
+          "column": 7
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/flow/internal-slot/object-method/output.json b/packages/babel-parser/test/fixtures/flow/internal-slot/object-method/output.json
index 2be1cc35f8..b42f9eacce 100644
--- a/packages/babel-parser/test/fixtures/flow/internal-slot/object-method/output.json
+++ b/packages/babel-parser/test/fixtures/flow/internal-slot/object-method/output.json
@@ -166,7 +166,8 @@
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             }
           ],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/internal-slot/object-optional/output.json b/packages/babel-parser/test/fixtures/flow/internal-slot/object-optional/output.json
index 9a422ace0d..605db54c85 100644
--- a/packages/babel-parser/test/fixtures/flow/internal-slot/object-optional/output.json
+++ b/packages/babel-parser/test/fixtures/flow/internal-slot/object-optional/output.json
@@ -148,7 +148,8 @@
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             }
           ],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/internal-slot/object/output.json b/packages/babel-parser/test/fixtures/flow/internal-slot/object/output.json
index dd474f9d39..6ff31113bc 100644
--- a/packages/babel-parser/test/fixtures/flow/internal-slot/object/output.json
+++ b/packages/babel-parser/test/fixtures/flow/internal-slot/object/output.json
@@ -147,7 +147,8 @@
               }
             }
           ],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/iterator/12/output.json b/packages/babel-parser/test/fixtures/flow/iterator/12/output.json
index 523dd9f5cb..865bb50328 100644
--- a/packages/babel-parser/test/fixtures/flow/iterator/12/output.json
+++ b/packages/babel-parser/test/fixtures/flow/iterator/12/output.json
@@ -168,7 +168,8 @@
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             "indexers": [],
             "internalSlots": [],
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+            "exact": false,
+            "inexact": false
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         "body": {
diff --git a/packages/babel-parser/test/fixtures/flow/iterator/13/output.json b/packages/babel-parser/test/fixtures/flow/iterator/13/output.json
index 7162d07e7f..a21fcad31e 100644
--- a/packages/babel-parser/test/fixtures/flow/iterator/13/output.json
+++ b/packages/babel-parser/test/fixtures/flow/iterator/13/output.json
@@ -168,7 +168,8 @@
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             "indexers": [],
             "internalSlots": [],
-            "exact": false
+            "exact": false,
+            "inexact": false
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         "body": {
diff --git a/packages/babel-parser/test/fixtures/flow/object-types/complex-param-types/output.json b/packages/babel-parser/test/fixtures/flow/object-types/complex-param-types/output.json
index 4bd3e696e5..c6357989dc 100644
--- a/packages/babel-parser/test/fixtures/flow/object-types/complex-param-types/output.json
+++ b/packages/babel-parser/test/fixtures/flow/object-types/complex-param-types/output.json
@@ -233,7 +233,8 @@
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           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
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       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/type-alias/4/output.json b/packages/babel-parser/test/fixtures/flow/type-alias/4/output.json
index c7bc622454..a1ff7e2786 100644
--- a/packages/babel-parser/test/fixtures/flow/type-alias/4/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-alias/4/output.json
@@ -153,7 +153,8 @@
               ],
               "indexers": [],
               "internalSlots": [],
-              "exact": false
+              "exact": false,
+              "inexact": false
             },
             {
               "type": "ObjectTypeAnnotation",
@@ -232,7 +233,8 @@
               ],
               "indexers": [],
               "internalSlots": [],
-              "exact": false
+              "exact": false,
+              "inexact": false
             }
           ]
         }
@@ -626,7 +628,8 @@
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                     "indexers": [],
                     "internalSlots": [],
-                    "exact": false
+                    "exact": false,
+                    "inexact": false
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                   {
                     "type": "ObjectTypeAnnotation",
@@ -705,7 +708,8 @@
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                     "indexers": [],
                     "internalSlots": [],
-                    "exact": false
+                    "exact": false,
+                    "inexact": false
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                 ]
               },
@@ -715,7 +719,8 @@
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           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
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       },
       {
@@ -893,7 +898,8 @@
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                     "indexers": [],
                     "internalSlots": [],
-                    "exact": false
+                    "exact": false,
+                    "inexact": false
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                   {
                     "type": "ObjectTypeAnnotation",
@@ -972,7 +978,8 @@
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-                    "exact": false
+                    "exact": false,
+                    "inexact": false
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                 ]
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@@ -982,7 +989,8 @@
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+          "exact": false,
+          "inexact": false
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       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/108/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/108/output.json
index 59d32d37d0..a3e8ba642b 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/108/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/108/output.json
@@ -213,7 +213,8 @@
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                   "indexers": [],
                   "internalSlots": [],
-                  "exact": true
+                  "exact": true,
+                  "inexact": false
                 }
               }
             },
@@ -532,7 +533,8 @@
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                   "indexers": [],
                   "internalSlots": [],
-                  "exact": true
+                  "exact": true,
+                  "inexact": false
                 }
               }
             },
@@ -744,7 +746,8 @@
                   "properties": [],
                   "indexers": [],
                   "internalSlots": [],
-                  "exact": true
+                  "exact": true,
+                  "inexact": false
                 }
               }
             },
@@ -1003,7 +1006,8 @@
                         ],
                         "indexers": [],
                         "internalSlots": [],
-                        "exact": true
+                        "exact": true,
+                        "inexact": false
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                       "optional": false
@@ -1064,7 +1068,8 @@
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                   "indexers": [],
                   "internalSlots": [],
-                  "exact": false
+                  "exact": false,
+                  "inexact": false
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               }
             },
@@ -1537,7 +1542,8 @@
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                         "indexers": [],
                         "internalSlots": [],
-                        "exact": false
+                        "exact": false,
+                        "inexact": false
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                       "variance": null,
                       "optional": false
@@ -1598,7 +1604,8 @@
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                   "indexers": [],
                   "internalSlots": [],
-                  "exact": true
+                  "exact": true,
+                  "inexact": false
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               }
             },
diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/110/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/110/output.json
index 4929bc3d47..4b3587d4c8 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/110/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/110/output.json
@@ -166,7 +166,8 @@
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           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
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       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/111/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/111/output.json
index afb693e336..ec02ec5739 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/111/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/111/output.json
@@ -166,7 +166,8 @@
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           "internalSlots": [],
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+          "exact": false,
+          "inexact": false
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     ],
diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/114/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/114/output.json
index 0cb28d6e0f..ed63013702 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/114/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/114/output.json
@@ -195,7 +195,8 @@
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+          "exact": false,
+          "inexact": false
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/115/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/115/output.json
index da040897ad..df1f40c306 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/115/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/115/output.json
@@ -195,7 +195,8 @@
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+          "exact": false,
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/127/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/127/output.json
index 4d08cf6244..165aac2e4c 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/127/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/127/output.json
@@ -128,7 +128,8 @@
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+          "exact": false,
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/128/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/128/output.json
index cf23e569d2..345675c7e1 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/128/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/128/output.json
@@ -160,7 +160,8 @@
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+          "exact": false,
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/135/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/135/output.json
index aa8891c0b7..ce7e04fe78 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/135/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/135/output.json
@@ -110,7 +110,8 @@
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+          "exact": false,
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/136/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/136/output.json
index f2a1f069cf..bdd81eaa2c 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/136/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/136/output.json
@@ -130,7 +130,8 @@
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                 "internalSlots": [],
-                "exact": false
+                "exact": false,
+                "inexact": false
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               "optional": false
@@ -167,13 +168,15 @@
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+                "exact": false,
+                "inexact": false
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           ],
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           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/138/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/138/output.json
index 1987550217..6e48beeb05 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/138/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/138/output.json
@@ -276,7 +276,8 @@
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           "internalSlots": [],
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+          "exact": false,
+          "inexact": false
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/16/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/16/output.json
index 4db03aa8f5..59fe3a8d36 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/16/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/16/output.json
@@ -96,7 +96,8 @@
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             "indexers": [],
             "internalSlots": [],
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+            "exact": false,
+            "inexact": false
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         "body": {
diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/32/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/32/output.json
index 6e85ab61db..70cbbd4fef 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/32/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/32/output.json
@@ -160,7 +160,8 @@
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                   "internalSlots": [],
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/33/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/33/output.json
index 5b4664821d..1ef29b3b8b 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/33/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/33/output.json
@@ -160,7 +160,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/34/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/34/output.json
index e0cef862f3..b389c49201 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/34/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/34/output.json
@@ -225,7 +225,8 @@
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+                  "exact": false,
+                  "inexact": false
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/35/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/35/output.json
index 42d9e07ef5..cc227490d3 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/35/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/35/output.json
@@ -174,7 +174,8 @@
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                     "internalSlots": [],
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+                    "exact": false,
+                    "inexact": false
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/36/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/36/output.json
index fee4f6be45..431aa501bc 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/36/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/36/output.json
@@ -213,7 +213,8 @@
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                   "internalSlots": [],
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+                  "exact": false,
+                  "inexact": false
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/37/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/37/output.json
index 24897a890d..428bb08cb9 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/37/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/37/output.json
@@ -211,7 +211,8 @@
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                         "indexers": [],
                         "internalSlots": [],
-                        "exact": false
+                        "exact": false,
+                        "inexact": false
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                       "optional": false
@@ -219,7 +220,8 @@
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                   "internalSlots": [],
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+                  "exact": false,
+                  "inexact": false
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/38/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/38/output.json
index 537525fd50..0e133ba1cf 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/38/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/38/output.json
@@ -225,7 +225,8 @@
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                           "indexers": [],
                           "internalSlots": [],
-                          "exact": false
+                          "exact": false,
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                       "variance": null,
@@ -234,7 +235,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/39/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/39/output.json
index fe3cbacc4b..03cc703ab8 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/39/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/39/output.json
@@ -213,7 +213,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/40/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/40/output.json
index ed33244fe9..2cfc8de959 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/40/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/40/output.json
@@ -213,7 +213,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/41/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/41/output.json
index 9e2c759153..2f073e822e 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/41/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/41/output.json
@@ -235,7 +235,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/42/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/42/output.json
index 446275326e..b918a1e51b 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/42/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/42/output.json
@@ -322,7 +322,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/43/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/43/output.json
index 027091719c..05ff2466b9 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/43/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/43/output.json
@@ -295,7 +295,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/60/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/60/output.json
index 1f013f7840..cfa5f6db54 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/60/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/60/output.json
@@ -215,7 +215,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/61/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/61/output.json
index c26e02abf8..25d46071b8 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/61/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/61/output.json
@@ -215,7 +215,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/63/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/63/output.json
index 7311b8c241..e9fb827b5b 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/63/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/63/output.json
@@ -220,7 +220,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/98/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/98/output.json
index 669cab2fd5..6a24cf2f1e 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/98/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/98/output.json
@@ -266,7 +266,8 @@
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diff --git a/packages/babel-parser/test/fixtures/flow/type-annotations/object-type-method/output.json b/packages/babel-parser/test/fixtures/flow/type-annotations/object-type-method/output.json
index 61c974a718..f72e8ff175 100644
--- a/packages/babel-parser/test/fixtures/flow/type-annotations/object-type-method/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-annotations/object-type-method/output.json
@@ -151,7 +151,8 @@
           ],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       },
       {
@@ -309,7 +310,8 @@
           ],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       },
       {
@@ -433,7 +435,8 @@
           ],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       },
       {
@@ -590,7 +593,8 @@
           ],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       },
       {
@@ -693,7 +697,8 @@
           "properties": [],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       },
       {
@@ -896,7 +901,8 @@
           "properties": [],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       },
       {
diff --git a/packages/babel-parser/test/fixtures/flow/type-parameter-declaration/type-object-reserved-word/output.json b/packages/babel-parser/test/fixtures/flow/type-parameter-declaration/type-object-reserved-word/output.json
index 0b9e5fd724..d817f6ed47 100644
--- a/packages/babel-parser/test/fixtures/flow/type-parameter-declaration/type-object-reserved-word/output.json
+++ b/packages/babel-parser/test/fixtures/flow/type-parameter-declaration/type-object-reserved-word/output.json
@@ -492,7 +492,8 @@
           ],
           "indexers": [],
           "internalSlots": [],
-          "exact": false
+          "exact": false,
+          "inexact": false
         }
       }
     ],
diff --git a/packages/babel-parser/test/fixtures/flow/typecasts/2/output.json b/packages/babel-parser/test/fixtures/flow/typecasts/2/output.json
index 45638f476d..4d9f9da74b 100644
--- a/packages/babel-parser/test/fixtures/flow/typecasts/2/output.json
+++ b/packages/babel-parser/test/fixtures/flow/typecasts/2/output.json
@@ -323,7 +323,8 @@
               ],
               "indexers": [],
               "internalSlots": [],
-              "exact": false
+              "exact": false,
+              "inexact": false
             }
           },
           "extra": {
diff --git a/packages/babel-types/src/definitions/flow.js b/packages/babel-types/src/definitions/flow.js
index fa4ad6e52d..bb08e9112a 100644
--- a/packages/babel-types/src/definitions/flow.js
+++ b/packages/babel-types/src/definitions/flow.js
@@ -277,6 +277,10 @@ defineType("ObjectTypeAnnotation", {
       validate: assertValueType("boolean"),
       default: false,
     },
+    // If the inexact flag is present then this is an object type, and not a
+    // declare class, declare interface, or interface. If it is true, the
+    // object uses ... to express that it is inexact.
+    inexact: validateOptional(assertValueType("boolean")),
   },
 });