diff --git a/Makefile b/Makefile
index 7926e7e730..b0051a4efc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 MAKEFLAGS = -j1
-FLOW_COMMIT = 622bbc4f07acb77eb1109830c70815f827401d90
+FLOW_COMMIT = f193e19cf2185006ea9139bb0e71f31ea93e7b72
 TEST262_COMMIT = 52f70e2f637731aae92a9c9a2d831310c3ab2e1e
 
 # Fix color output until TravisCI fixes https://github.com/travis-ci/travis-ci/issues/7967
diff --git a/packages/babel-generator/src/generators/flow.js b/packages/babel-generator/src/generators/flow.js
index 28418c9f90..86088bdd40 100644
--- a/packages/babel-generator/src/generators/flow.js
+++ b/packages/babel-generator/src/generators/flow.js
@@ -228,6 +228,12 @@ export function _interfaceish(node: Object) {
     this.space();
     this.printList(node.mixins, node);
   }
+  if (node.implements && node.implements.length) {
+    this.space();
+    this.word("implements");
+    this.space();
+    this.printList(node.implements, node);
+  }
   this.space();
   this.print(node.body, node);
 }
diff --git a/packages/babel-generator/test/fixtures/flow/implements/input.js b/packages/babel-generator/test/fixtures/flow/implements/input.js
new file mode 100644
index 0000000000..32acd7162b
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/flow/implements/input.js
@@ -0,0 +1,5 @@
+class A implements B {}
+class A implements B, C {}
+declare class A implements B {}
+declare class A mixins B implements C {}
+declare class A implements B, C {}
diff --git a/packages/babel-generator/test/fixtures/flow/implements/output.js b/packages/babel-generator/test/fixtures/flow/implements/output.js
new file mode 100644
index 0000000000..6f2f016681
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/flow/implements/output.js
@@ -0,0 +1,7 @@
+class A implements B {}
+
+class A implements B, C {}
+
+declare class A implements B {}
+declare class A mixins B implements C {}
+declare class A implements B, C {}
\ No newline at end of file
diff --git a/packages/babel-types/README.md b/packages/babel-types/README.md
index aeb03d9bb9..d4b183a29b 100644
--- a/packages/babel-types/README.md
+++ b/packages/babel-types/README.md
@@ -433,6 +433,7 @@ Aliases: `Flow`, `FlowDeclaration`, `Statement`, `Declaration`
  - `typeParameters`: `TypeParameterInstantiation` (default: `null`)
  - `extends`: `Array<InterfaceExtends>` (default: `null`)
  - `body`: `ObjectTypeAnnotation` (required)
+ - `implements`: `Array<ClassImplements>` (default: `null`)
  - `mixins`: `Array<InterfaceExtends>` (default: `null`)
 
 ---
@@ -492,9 +493,10 @@ Aliases: `Flow`, `FlowDeclaration`, `Statement`, `Declaration`
 
  - `id`: `Identifier` (required)
  - `typeParameters`: `TypeParameterDeclaration` (default: `null`)
- - `extends`: `InterfaceExtends` (default: `null`)
+ - `extends`: `Array<InterfaceExtends>` (default: `null`)
  - `body`: `ObjectTypeAnnotation` (required)
- - `mixins`: `Array<Flow>` (default: `null`)
+ - `implements`: `Array<ClassImplements>` (default: `null`)
+ - `mixins`: `Array<InterfaceExtends>` (default: `null`)
 
 ---
 
@@ -1038,8 +1040,9 @@ Aliases: `Flow`, `FlowDeclaration`, `Statement`, `Declaration`
 
  - `id`: `Identifier` (required)
  - `typeParameters`: `TypeParameterDeclaration` (default: `null`)
- - `extends`: `Array<InterfaceExtends>` (required)
+ - `extends`: `Array<InterfaceExtends>` (default: `null`)
  - `body`: `ObjectTypeAnnotation` (required)
+ - `implements`: `Array<ClassImplements>` (default: `null`)
  - `mixins`: `Array<InterfaceExtends>` (default: `null`)
 
 ---
diff --git a/packages/babel-types/src/definitions/flow.js b/packages/babel-types/src/definitions/flow.js
index ac947fb09e..5d58b24681 100644
--- a/packages/babel-types/src/definitions/flow.js
+++ b/packages/babel-types/src/definitions/flow.js
@@ -9,6 +9,32 @@ import defineType, {
   validateType,
 } from "./utils";
 
+const defineInterfaceishType = (
+  name: string,
+  typeParameterType: string = "TypeParameterDeclaration",
+) => {
+  defineType(name, {
+    builder: ["id", "typeParameters", "extends", "body"],
+    visitor: [
+      "id",
+      "typeParameters",
+      "extends",
+      "mixins",
+      "implements",
+      "body",
+    ],
+    aliases: ["Flow", "FlowDeclaration", "Statement", "Declaration"],
+    fields: {
+      id: validateType("Identifier"),
+      typeParameters: validateOptionalType(typeParameterType),
+      extends: validateOptional(arrayOfType("InterfaceExtends")),
+      mixins: validateOptional(arrayOfType("InterfaceExtends")),
+      implements: validateOptional(arrayOfType("ClassImplements")),
+      body: validateType("ObjectTypeAnnotation"),
+    },
+  });
+};
+
 defineType("AnyTypeAnnotation", {
   aliases: ["Flow", "FlowType", "FlowBaseAnnotation"],
 });
@@ -46,17 +72,7 @@ defineType("ClassImplements", {
   },
 });
 
-defineType("DeclareClass", {
-  visitor: ["id", "typeParameters", "extends", "body"],
-  aliases: ["Flow", "FlowDeclaration", "Statement", "Declaration"],
-  fields: {
-    id: validateType("Identifier"),
-    typeParameters: validateOptionalType("TypeParameterInstantiation"),
-    extends: validateOptional(arrayOfType("InterfaceExtends")),
-    mixins: validateOptional(arrayOfType("InterfaceExtends")),
-    body: validateType("ObjectTypeAnnotation"),
-  },
-});
+defineInterfaceishType("DeclareClass", "TypeParameterInstantiation");
 
 defineType("DeclareFunction", {
   visitor: ["id"],
@@ -67,17 +83,7 @@ defineType("DeclareFunction", {
   },
 });
 
-defineType("DeclareInterface", {
-  visitor: ["id", "typeParameters", "extends", "body"],
-  aliases: ["Flow", "FlowDeclaration", "Statement", "Declaration"],
-  fields: {
-    id: validateType("Identifier"),
-    typeParameters: validateOptionalType("TypeParameterDeclaration"),
-    extends: validateOptionalType("InterfaceExtends"),
-    mixins: validateOptional(arrayOfType("Flow")),
-    body: validateType("ObjectTypeAnnotation"),
-  },
-});
+defineInterfaceishType("DeclareInterface");
 
 defineType("DeclareModule", {
   builder: ["id", "body", "kind"],
@@ -203,17 +209,7 @@ defineType("InterfaceExtends", {
   },
 });
 
-defineType("InterfaceDeclaration", {
-  visitor: ["id", "typeParameters", "extends", "body"],
-  aliases: ["Flow", "FlowDeclaration", "Statement", "Declaration"],
-  fields: {
-    id: validateType("Identifier"),
-    typeParameters: validateOptionalType("TypeParameterDeclaration"),
-    extends: validate(arrayOfType("InterfaceExtends")),
-    mixins: validate(arrayOfType("InterfaceExtends")),
-    body: validateType("ObjectTypeAnnotation"),
-  },
-});
+defineInterfaceishType("InterfaceDeclaration");
 
 defineType("IntersectionTypeAnnotation", {
   visitor: ["types"],
diff --git a/packages/babylon/src/plugins/flow.js b/packages/babylon/src/plugins/flow.js
index f9f4c02048..2e54cb4fdb 100644
--- a/packages/babylon/src/plugins/flow.js
+++ b/packages/babylon/src/plugins/flow.js
@@ -403,6 +403,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       }
 
       node.extends = [];
+      node.implements = [];
       node.mixins = [];
 
       if (this.eat(tt._extends)) {
@@ -418,6 +419,13 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         } while (this.eat(tt.comma));
       }
 
+      if (this.isContextual("implements")) {
+        this.next();
+        do {
+          node.implements.push(this.flowParseInterfaceExtends());
+        } while (this.eat(tt.comma));
+      }
+
       node.body = this.flowParseObjectType(true, false, false);
     }
 
diff --git a/packages/babylon/test/fixtures/flow/call-properties/5/output.json b/packages/babylon/test/fixtures/flow/call-properties/5/output.json
index 74587ef411..306d17dc8c 100644
--- a/packages/babylon/test/fixtures/flow/call-properties/5/output.json
+++ b/packages/babylon/test/fixtures/flow/call-properties/5/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/class-properties/getter-setter/output.json b/packages/babylon/test/fixtures/flow/class-properties/getter-setter/output.json
index d2e591f280..9439a28902 100644
--- a/packages/babylon/test/fixtures/flow/class-properties/getter-setter/output.json
+++ b/packages/babylon/test/fixtures/flow/class-properties/getter-setter/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/class-properties/named-static/output.json b/packages/babylon/test/fixtures/flow/class-properties/named-static/output.json
index bdec47c1a5..cb362f9359 100644
--- a/packages/babylon/test/fixtures/flow/class-properties/named-static/output.json
+++ b/packages/babylon/test/fixtures/flow/class-properties/named-static/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/classes/implements-multiple/input.js b/packages/babylon/test/fixtures/flow/classes/implements-multiple/input.js
new file mode 100644
index 0000000000..59345566e7
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/classes/implements-multiple/input.js
@@ -0,0 +1 @@
+class A implements B, C {}
diff --git a/packages/babylon/test/fixtures/flow/classes/implements-multiple/output.json b/packages/babylon/test/fixtures/flow/classes/implements-multiple/output.json
new file mode 100644
index 0000000000..d1857f6c95
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/classes/implements-multiple/output.json
@@ -0,0 +1,151 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 26,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 26
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 26,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 26
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "ClassDeclaration",
+        "start": 0,
+        "end": 26,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 26
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 6,
+          "end": 7,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 6
+            },
+            "end": {
+              "line": 1,
+              "column": 7
+            },
+            "identifierName": "A"
+          },
+          "name": "A"
+        },
+        "superClass": null,
+        "implements": [
+          {
+            "type": "ClassImplements",
+            "start": 19,
+            "end": 20,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 19
+              },
+              "end": {
+                "line": 1,
+                "column": 20
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 19,
+              "end": 20,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 19
+                },
+                "end": {
+                  "line": 1,
+                  "column": 20
+                },
+                "identifierName": "B"
+              },
+              "name": "B"
+            },
+            "typeParameters": null
+          },
+          {
+            "type": "ClassImplements",
+            "start": 22,
+            "end": 23,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 22
+              },
+              "end": {
+                "line": 1,
+                "column": 23
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 22,
+              "end": 23,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 22
+                },
+                "end": {
+                  "line": 1,
+                  "column": 23
+                },
+                "identifierName": "C"
+              },
+              "name": "C"
+            },
+            "typeParameters": null
+          }
+        ],
+        "body": {
+          "type": "ClassBody",
+          "start": 24,
+          "end": 26,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 24
+            },
+            "end": {
+              "line": 1,
+              "column": 26
+            }
+          },
+          "body": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/flow/classes/implements/input.js b/packages/babylon/test/fixtures/flow/classes/implements/input.js
new file mode 100644
index 0000000000..774eb9795a
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/classes/implements/input.js
@@ -0,0 +1 @@
+class A implements B {}
diff --git a/packages/babylon/test/fixtures/flow/classes/implements/output.json b/packages/babylon/test/fixtures/flow/classes/implements/output.json
new file mode 100644
index 0000000000..7eeb588da8
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/classes/implements/output.json
@@ -0,0 +1,118 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 23,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 23
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 23,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 23
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "ClassDeclaration",
+        "start": 0,
+        "end": 23,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 23
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 6,
+          "end": 7,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 6
+            },
+            "end": {
+              "line": 1,
+              "column": 7
+            },
+            "identifierName": "A"
+          },
+          "name": "A"
+        },
+        "superClass": null,
+        "implements": [
+          {
+            "type": "ClassImplements",
+            "start": 19,
+            "end": 20,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 19
+              },
+              "end": {
+                "line": 1,
+                "column": 20
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 19,
+              "end": 20,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 19
+                },
+                "end": {
+                  "line": 1,
+                  "column": 20
+                },
+                "identifierName": "B"
+              },
+              "name": "B"
+            },
+            "typeParameters": null
+          }
+        ],
+        "body": {
+          "type": "ClassBody",
+          "start": 21,
+          "end": 23,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 21
+            },
+            "end": {
+              "line": 1,
+              "column": 23
+            }
+          },
+          "body": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/flow/classes/mixins-error/input.js b/packages/babylon/test/fixtures/flow/classes/mixins-error/input.js
new file mode 100644
index 0000000000..773a7d6dee
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/classes/mixins-error/input.js
@@ -0,0 +1 @@
+class A mixins B {}
diff --git a/packages/babylon/test/fixtures/flow/classes/mixins-error/options.json b/packages/babylon/test/fixtures/flow/classes/mixins-error/options.json
new file mode 100644
index 0000000000..2957be2fe4
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/classes/mixins-error/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \"{\" (1:8)"
+}
diff --git a/packages/babylon/test/fixtures/flow/declare-class/implements-multiple/input.js b/packages/babylon/test/fixtures/flow/declare-class/implements-multiple/input.js
new file mode 100644
index 0000000000..9132ccd309
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/implements-multiple/input.js
@@ -0,0 +1 @@
+declare class A implements B, C {}
diff --git a/packages/babylon/test/fixtures/flow/declare-class/implements-multiple/output.json b/packages/babylon/test/fixtures/flow/declare-class/implements-multiple/output.json
new file mode 100644
index 0000000000..d542929729
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/implements-multiple/output.json
@@ -0,0 +1,156 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 34,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 34
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 34,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 34
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "DeclareClass",
+        "start": 0,
+        "end": 34,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 34
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 14,
+          "end": 15,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 14
+            },
+            "end": {
+              "line": 1,
+              "column": 15
+            },
+            "identifierName": "A"
+          },
+          "name": "A"
+        },
+        "typeParameters": null,
+        "extends": [],
+        "implements": [
+          {
+            "type": "InterfaceExtends",
+            "start": 27,
+            "end": 28,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 27
+              },
+              "end": {
+                "line": 1,
+                "column": 28
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 27,
+              "end": 28,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 27
+                },
+                "end": {
+                  "line": 1,
+                  "column": 28
+                },
+                "identifierName": "B"
+              },
+              "name": "B"
+            },
+            "typeParameters": null
+          },
+          {
+            "type": "InterfaceExtends",
+            "start": 30,
+            "end": 31,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 30
+              },
+              "end": {
+                "line": 1,
+                "column": 31
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 30,
+              "end": 31,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 30
+                },
+                "end": {
+                  "line": 1,
+                  "column": 31
+                },
+                "identifierName": "C"
+              },
+              "name": "C"
+            },
+            "typeParameters": null
+          }
+        ],
+        "mixins": [],
+        "body": {
+          "type": "ObjectTypeAnnotation",
+          "start": 32,
+          "end": 34,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 32
+            },
+            "end": {
+              "line": 1,
+              "column": 34
+            }
+          },
+          "callProperties": [],
+          "properties": [],
+          "indexers": [],
+          "exact": false
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin-order/input.js b/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin-order/input.js
new file mode 100644
index 0000000000..aef489825d
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin-order/input.js
@@ -0,0 +1 @@
+declare class A implements B mixins C {}
diff --git a/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin-order/options.json b/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin-order/options.json
new file mode 100644
index 0000000000..8920601d7c
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin-order/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \"{\" (1:29)"
+}
diff --git a/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin/input.js b/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin/input.js
new file mode 100644
index 0000000000..045b763b6e
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin/input.js
@@ -0,0 +1 @@
+declare class A mixins B implements C {}
diff --git a/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin/output.json b/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin/output.json
new file mode 100644
index 0000000000..90a3ce2742
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/implements-with-mixin/output.json
@@ -0,0 +1,157 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 40,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 40
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 40,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 40
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "DeclareClass",
+        "start": 0,
+        "end": 40,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 40
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 14,
+          "end": 15,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 14
+            },
+            "end": {
+              "line": 1,
+              "column": 15
+            },
+            "identifierName": "A"
+          },
+          "name": "A"
+        },
+        "typeParameters": null,
+        "extends": [],
+        "implements": [
+          {
+            "type": "InterfaceExtends",
+            "start": 36,
+            "end": 37,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 36
+              },
+              "end": {
+                "line": 1,
+                "column": 37
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 36,
+              "end": 37,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 36
+                },
+                "end": {
+                  "line": 1,
+                  "column": 37
+                },
+                "identifierName": "C"
+              },
+              "name": "C"
+            },
+            "typeParameters": null
+          }
+        ],
+        "mixins": [
+          {
+            "type": "InterfaceExtends",
+            "start": 23,
+            "end": 24,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 23
+              },
+              "end": {
+                "line": 1,
+                "column": 24
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 23,
+              "end": 24,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 23
+                },
+                "end": {
+                  "line": 1,
+                  "column": 24
+                },
+                "identifierName": "B"
+              },
+              "name": "B"
+            },
+            "typeParameters": null
+          }
+        ],
+        "body": {
+          "type": "ObjectTypeAnnotation",
+          "start": 38,
+          "end": 40,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 38
+            },
+            "end": {
+              "line": 1,
+              "column": 40
+            }
+          },
+          "callProperties": [],
+          "properties": [],
+          "indexers": [],
+          "exact": false
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/flow/declare-class/implements/input.js b/packages/babylon/test/fixtures/flow/declare-class/implements/input.js
new file mode 100644
index 0000000000..35893a6f9b
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/implements/input.js
@@ -0,0 +1 @@
+declare class A implements B {}
diff --git a/packages/babylon/test/fixtures/flow/declare-class/implements/output.json b/packages/babylon/test/fixtures/flow/declare-class/implements/output.json
new file mode 100644
index 0000000000..2b6e2f9226
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/implements/output.json
@@ -0,0 +1,123 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 31,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 31
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 31,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 31
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "DeclareClass",
+        "start": 0,
+        "end": 31,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 31
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 14,
+          "end": 15,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 14
+            },
+            "end": {
+              "line": 1,
+              "column": 15
+            },
+            "identifierName": "A"
+          },
+          "name": "A"
+        },
+        "typeParameters": null,
+        "extends": [],
+        "implements": [
+          {
+            "type": "InterfaceExtends",
+            "start": 27,
+            "end": 28,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 27
+              },
+              "end": {
+                "line": 1,
+                "column": 28
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 27,
+              "end": 28,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 27
+                },
+                "end": {
+                  "line": 1,
+                  "column": 28
+                },
+                "identifierName": "B"
+              },
+              "name": "B"
+            },
+            "typeParameters": null
+          }
+        ],
+        "mixins": [],
+        "body": {
+          "type": "ObjectTypeAnnotation",
+          "start": 29,
+          "end": 31,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 29
+            },
+            "end": {
+              "line": 1,
+              "column": 31
+            }
+          },
+          "callProperties": [],
+          "properties": [],
+          "indexers": [],
+          "exact": false
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/flow/declare-class/mixins-multiple/input.js b/packages/babylon/test/fixtures/flow/declare-class/mixins-multiple/input.js
new file mode 100644
index 0000000000..caa2cc2f2c
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/mixins-multiple/input.js
@@ -0,0 +1 @@
+declare class A mixins B, C {}
diff --git a/packages/babylon/test/fixtures/flow/declare-class/mixins-multiple/output.json b/packages/babylon/test/fixtures/flow/declare-class/mixins-multiple/output.json
new file mode 100644
index 0000000000..2e0c40e321
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/mixins-multiple/output.json
@@ -0,0 +1,156 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 30,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 30
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 30,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 30
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "DeclareClass",
+        "start": 0,
+        "end": 30,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 30
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 14,
+          "end": 15,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 14
+            },
+            "end": {
+              "line": 1,
+              "column": 15
+            },
+            "identifierName": "A"
+          },
+          "name": "A"
+        },
+        "typeParameters": null,
+        "extends": [],
+        "implements": [],
+        "mixins": [
+          {
+            "type": "InterfaceExtends",
+            "start": 23,
+            "end": 24,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 23
+              },
+              "end": {
+                "line": 1,
+                "column": 24
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 23,
+              "end": 24,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 23
+                },
+                "end": {
+                  "line": 1,
+                  "column": 24
+                },
+                "identifierName": "B"
+              },
+              "name": "B"
+            },
+            "typeParameters": null
+          },
+          {
+            "type": "InterfaceExtends",
+            "start": 26,
+            "end": 27,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 26
+              },
+              "end": {
+                "line": 1,
+                "column": 27
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 26,
+              "end": 27,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 26
+                },
+                "end": {
+                  "line": 1,
+                  "column": 27
+                },
+                "identifierName": "C"
+              },
+              "name": "C"
+            },
+            "typeParameters": null
+          }
+        ],
+        "body": {
+          "type": "ObjectTypeAnnotation",
+          "start": 28,
+          "end": 30,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 28
+            },
+            "end": {
+              "line": 1,
+              "column": 30
+            }
+          },
+          "callProperties": [],
+          "properties": [],
+          "indexers": [],
+          "exact": false
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/flow/declare-class/mixins/input.js b/packages/babylon/test/fixtures/flow/declare-class/mixins/input.js
new file mode 100644
index 0000000000..bc8b256f85
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/mixins/input.js
@@ -0,0 +1 @@
+declare class A mixins B {}
diff --git a/packages/babylon/test/fixtures/flow/declare-class/mixins/output.json b/packages/babylon/test/fixtures/flow/declare-class/mixins/output.json
new file mode 100644
index 0000000000..4dc1aceddf
--- /dev/null
+++ b/packages/babylon/test/fixtures/flow/declare-class/mixins/output.json
@@ -0,0 +1,123 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 27,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 27
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 27,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 27
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "DeclareClass",
+        "start": 0,
+        "end": 27,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 27
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 14,
+          "end": 15,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 14
+            },
+            "end": {
+              "line": 1,
+              "column": 15
+            },
+            "identifierName": "A"
+          },
+          "name": "A"
+        },
+        "typeParameters": null,
+        "extends": [],
+        "implements": [],
+        "mixins": [
+          {
+            "type": "InterfaceExtends",
+            "start": 23,
+            "end": 24,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 23
+              },
+              "end": {
+                "line": 1,
+                "column": 24
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 23,
+              "end": 24,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 23
+                },
+                "end": {
+                  "line": 1,
+                  "column": 24
+                },
+                "identifierName": "B"
+              },
+              "name": "B"
+            },
+            "typeParameters": null
+          }
+        ],
+        "body": {
+          "type": "ObjectTypeAnnotation",
+          "start": 25,
+          "end": 27,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 25
+            },
+            "end": {
+              "line": 1,
+              "column": 27
+            }
+          },
+          "callProperties": [],
+          "properties": [],
+          "indexers": [],
+          "exact": false
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/flow/declare-export/export-class/output.json b/packages/babylon/test/fixtures/flow/declare-export/export-class/output.json
index 4150ba6490..98d369c164 100644
--- a/packages/babylon/test/fixtures/flow/declare-export/export-class/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-export/export-class/output.json
@@ -124,6 +124,7 @@
                 },
                 "typeParameters": null,
                 "extends": [],
+                "implements": [],
                 "mixins": [],
                 "body": {
                   "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-export/export-default-class/output.json b/packages/babylon/test/fixtures/flow/declare-export/export-default-class/output.json
index 62d258e3a7..61983df103 100644
--- a/packages/babylon/test/fixtures/flow/declare-export/export-default-class/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-export/export-default-class/output.json
@@ -75,6 +75,7 @@
           },
           "typeParameters": null,
           "extends": [],
+          "implements": [],
           "mixins": [],
           "body": {
             "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-export/export-interface-and-var/output.json b/packages/babylon/test/fixtures/flow/declare-export/export-interface-and-var/output.json
index c793dc2bb5..a5e525c737 100644
--- a/packages/babylon/test/fixtures/flow/declare-export/export-interface-and-var/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-export/export-interface-and-var/output.json
@@ -126,6 +126,7 @@
                 },
                 "typeParameters": null,
                 "extends": [],
+                "implements": [],
                 "mixins": [],
                 "body": {
                   "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-export/export-interface-commonjs/output.json b/packages/babylon/test/fixtures/flow/declare-export/export-interface-commonjs/output.json
index 9263cc2989..39e702dea8 100644
--- a/packages/babylon/test/fixtures/flow/declare-export/export-interface-commonjs/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-export/export-interface-commonjs/output.json
@@ -126,6 +126,7 @@
                 },
                 "typeParameters": null,
                 "extends": [],
+                "implements": [],
                 "mixins": [],
                 "body": {
                   "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-export/export-interface/output.json b/packages/babylon/test/fixtures/flow/declare-export/export-interface/output.json
index 2524845b73..423ce5adf1 100644
--- a/packages/babylon/test/fixtures/flow/declare-export/export-interface/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-export/export-interface/output.json
@@ -126,6 +126,7 @@
                 },
                 "typeParameters": null,
                 "extends": [],
+                "implements": [],
                 "mixins": [],
                 "body": {
                   "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-module/5/output.json b/packages/babylon/test/fixtures/flow/declare-module/5/output.json
index 80be55a8c3..5ce1498f42 100644
--- a/packages/babylon/test/fixtures/flow/declare-module/5/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-module/5/output.json
@@ -107,6 +107,7 @@
               },
               "typeParameters": null,
               "extends": [],
+              "implements": [],
               "mixins": [],
               "body": {
                 "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/10/output.json b/packages/babylon/test/fixtures/flow/declare-statements/10/output.json
index 5342db2957..1bcf3e6e9e 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/10/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/10/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/11/output.json b/packages/babylon/test/fixtures/flow/declare-statements/11/output.json
index 6c57828705..5c95cf2a5b 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/11/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/11/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/12/output.json b/packages/babylon/test/fixtures/flow/declare-statements/12/output.json
index d7e3836060..4460f260fb 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/12/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/12/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/13/output.json b/packages/babylon/test/fixtures/flow/declare-statements/13/output.json
index 2e0f0e768e..b9f0125e9a 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/13/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/13/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [
           {
             "type": "InterfaceExtends",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/15/output.json b/packages/babylon/test/fixtures/flow/declare-statements/15/output.json
index b1cffdd603..3208fef5b5 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/15/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/15/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -201,6 +202,7 @@
           ]
         },
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/16/output.json b/packages/babylon/test/fixtures/flow/declare-statements/16/output.json
index 63647f77c7..68a1978b51 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/16/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/16/output.json
@@ -159,6 +159,7 @@
             "typeParameters": null
           }
         ],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/17/output.json b/packages/babylon/test/fixtures/flow/declare-statements/17/output.json
index 3f679259e7..3279562c14 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/17/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/17/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/18/output.json b/packages/babylon/test/fixtures/flow/declare-statements/18/output.json
index 4c3d432e19..3c4cd37283 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/18/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/18/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -165,6 +166,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/7/output.json b/packages/babylon/test/fixtures/flow/declare-statements/7/output.json
index 41df008a59..57e98a51ee 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/7/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/7/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/8/output.json b/packages/babylon/test/fixtures/flow/declare-statements/8/output.json
index 3f5d39aa5f..9ae134f7ae 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/8/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/8/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/declare-statements/9/output.json b/packages/babylon/test/fixtures/flow/declare-statements/9/output.json
index 5c887c2d78..757e446721 100644
--- a/packages/babylon/test/fixtures/flow/declare-statements/9/output.json
+++ b/packages/babylon/test/fixtures/flow/declare-statements/9/output.json
@@ -177,6 +177,7 @@
             }
           }
         ],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/1/output.json b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/1/output.json
index 005f5ae9d3..2ea75fd807 100644
--- a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/1/output.json
+++ b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/1/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/10/output.json b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/10/output.json
index 1260b7fcbb..8bebb8ba55 100644
--- a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/10/output.json
+++ b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/10/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/2/output.json b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/2/output.json
index 044027ca74..eb8ac60e38 100644
--- a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/2/output.json
+++ b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/2/output.json
@@ -95,6 +95,7 @@
             "typeParameters": null
           }
         ],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/3/output.json b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/3/output.json
index 2f896014d6..9212a82374 100644
--- a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/3/output.json
+++ b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/3/output.json
@@ -259,6 +259,7 @@
             }
           }
         ],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/4/output.json b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/4/output.json
index 492840fe45..2705283764 100644
--- a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/4/output.json
+++ b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/4/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/5/output.json b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/5/output.json
index 5076c34a90..2114abd4bf 100644
--- a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/5/output.json
+++ b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/5/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/id-reserved-value/output.json b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/id-reserved-value/output.json
index af2de65896..2fc2a10be8 100644
--- a/packages/babylon/test/fixtures/flow/interfaces-module-and-script/id-reserved-value/output.json
+++ b/packages/babylon/test/fixtures/flow/interfaces-module-and-script/id-reserved-value/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/iterator/01/output.json b/packages/babylon/test/fixtures/flow/iterator/01/output.json
index c8b579bc72..3275f3a0b9 100644
--- a/packages/babylon/test/fixtures/flow/iterator/01/output.json
+++ b/packages/babylon/test/fixtures/flow/iterator/01/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/iterator/02/output.json b/packages/babylon/test/fixtures/flow/iterator/02/output.json
index 0b5dd41ee4..8d0a7d2c0f 100644
--- a/packages/babylon/test/fixtures/flow/iterator/02/output.json
+++ b/packages/babylon/test/fixtures/flow/iterator/02/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/iterator/14/output.json b/packages/babylon/test/fixtures/flow/iterator/14/output.json
index 79013398e6..78e416e067 100644
--- a/packages/babylon/test/fixtures/flow/iterator/14/output.json
+++ b/packages/babylon/test/fixtures/flow/iterator/14/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/iterator/15/output.json b/packages/babylon/test/fixtures/flow/iterator/15/output.json
index c9a648a19c..02ed08c46b 100644
--- a/packages/babylon/test/fixtures/flow/iterator/15/output.json
+++ b/packages/babylon/test/fixtures/flow/iterator/15/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/type-annotations/object-type-method/output.json b/packages/babylon/test/fixtures/flow/type-annotations/object-type-method/output.json
index aefcaa1c07..3033b68e37 100644
--- a/packages/babylon/test/fixtures/flow/type-annotations/object-type-method/output.json
+++ b/packages/babylon/test/fixtures/flow/type-annotations/object-type-method/output.json
@@ -921,6 +921,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -1045,6 +1046,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -1169,6 +1171,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -1273,6 +1276,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/type-exports/interface/output.json b/packages/babylon/test/fixtures/flow/type-exports/interface/output.json
index 1e95a36e2b..f8cc2f9749 100644
--- a/packages/babylon/test/fixtures/flow/type-exports/interface/output.json
+++ b/packages/babylon/test/fixtures/flow/type-exports/interface/output.json
@@ -78,6 +78,7 @@
           },
           "typeParameters": null,
           "extends": [],
+          "implements": [],
           "mixins": [],
           "body": {
             "type": "ObjectTypeAnnotation",
@@ -251,6 +252,7 @@
             ]
           },
           "extends": [],
+          "implements": [],
           "mixins": [],
           "body": {
             "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/type-parameter-declaration/declare-class-method-reserved-word/output.json b/packages/babylon/test/fixtures/flow/type-parameter-declaration/declare-class-method-reserved-word/output.json
index f238f8f968..21c1ee39f8 100644
--- a/packages/babylon/test/fixtures/flow/type-parameter-declaration/declare-class-method-reserved-word/output.json
+++ b/packages/babylon/test/fixtures/flow/type-parameter-declaration/declare-class-method-reserved-word/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/type-parameter-declaration/declare-interface-method-reserved-word/output.json b/packages/babylon/test/fixtures/flow/type-parameter-declaration/declare-interface-method-reserved-word/output.json
index 03814b48e8..c38e1e5f03 100644
--- a/packages/babylon/test/fixtures/flow/type-parameter-declaration/declare-interface-method-reserved-word/output.json
+++ b/packages/babylon/test/fixtures/flow/type-parameter-declaration/declare-interface-method-reserved-word/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/type-parameter-declaration/default/output.json b/packages/babylon/test/fixtures/flow/type-parameter-declaration/default/output.json
index 56cf6e37d7..2f5255f913 100644
--- a/packages/babylon/test/fixtures/flow/type-parameter-declaration/default/output.json
+++ b/packages/babylon/test/fixtures/flow/type-parameter-declaration/default/output.json
@@ -2106,6 +2106,7 @@
           ]
         },
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -2253,6 +2254,7 @@
           ]
         },
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -2417,6 +2419,7 @@
           ]
         },
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -2596,6 +2599,7 @@
           ]
         },
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -2698,6 +2702,7 @@
           ]
         },
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -2845,6 +2850,7 @@
           ]
         },
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -3009,6 +3015,7 @@
           ]
         },
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
@@ -3188,6 +3195,7 @@
           ]
         },
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/packages/babylon/test/fixtures/flow/type-parameter-declaration/interface-reserved-word/output.json b/packages/babylon/test/fixtures/flow/type-parameter-declaration/interface-reserved-word/output.json
index 0d65a9a6c5..2811767bec 100644
--- a/packages/babylon/test/fixtures/flow/type-parameter-declaration/interface-reserved-word/output.json
+++ b/packages/babylon/test/fixtures/flow/type-parameter-declaration/interface-reserved-word/output.json
@@ -61,6 +61,7 @@
         },
         "typeParameters": null,
         "extends": [],
+        "implements": [],
         "mixins": [],
         "body": {
           "type": "ObjectTypeAnnotation",
diff --git a/scripts/tests/flow/flow_tests_whitelist.txt b/scripts/tests/flow/flow_tests_whitelist.txt
index 77bc9b9cc2..11303cbc2b 100644
--- a/scripts/tests/flow/flow_tests_whitelist.txt
+++ b/scripts/tests/flow/flow_tests_whitelist.txt
@@ -39,8 +39,6 @@ types/annotations_in_comments_invalid/migrated_0003.js
 types/annotations/static_is_reserved_param.js
 types/annotations/static_is_reserved_type.js
 types/annotations/void_is_reserved_param.js
-types/declare_export_invalid/migrated_0013.js
-types/declare_statements_invalid/migrated_0001.js
 types/member/reserved_words.js
 types/number_literal_invalid/migrated_0000.js
 types/parameter_defaults/migrated_0023.js
@@ -52,3 +50,5 @@ types/parameter_defaults/migrated_0031.js
 types/parameter_defaults/migrated_0032.js
 types/string_literal_invalid/migrated_0000.js
 types/typecasts_invalid/migrated_0001.js
+class_method_kinds/polymorphic_getter.js
+types/interfaces/prop_named_static.js
diff --git a/scripts/tests/flow/run_babylon_flow_tests.js b/scripts/tests/flow/run_babylon_flow_tests.js
index a17d629465..fb6b0b1f68 100644
--- a/scripts/tests/flow/run_babylon_flow_tests.js
+++ b/scripts/tests/flow/run_babylon_flow_tests.js
@@ -115,6 +115,7 @@ const flowOptionsMapping = {
   esproposal_class_static_fields: "classProperties",
   esproposal_export_star_as: "exportNamespaceFrom",
   esproposal_decorators: "decorators",
+  esproposal_optional_chaining: "optionalChaining",
   types: "flowComments",
 };
 
diff --git a/yarn.lock b/yarn.lock
index 742a5ed7d1..b0c78dd61a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1246,10 +1246,6 @@ assert@^1.1.1, assert@^1.4.0:
   dependencies:
     util "0.10.3"
 
-assertion-error@^1.0.1:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.1.0.tgz#e60b6b0e8f301bd97e5375215bda406c85118c0b"
-
 assign-symbols@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/assign-symbols/-/assign-symbols-1.0.0.tgz#59667f41fadd4f20ccbc2bb96b8d4f7f78ec0367"
@@ -1883,17 +1879,6 @@ center-align@^0.1.1:
     align-text "^0.1.3"
     lazy-cache "^1.0.3"
 
-chai@^4.1.0:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/chai/-/chai-4.1.2.tgz#0f64584ba642f0f2ace2806279f4f06ca23ad73c"
-  dependencies:
-    assertion-error "^1.0.1"
-    check-error "^1.0.1"
-    deep-eql "^3.0.0"
-    get-func-name "^2.0.0"
-    pathval "^1.0.0"
-    type-detect "^4.0.0"
-
 chalk@^1.0.0, chalk@^1.1.1, chalk@^1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
@@ -1920,10 +1905,6 @@ chardet@^0.4.0:
   version "0.4.2"
   resolved "https://registry.yarnpkg.com/chardet/-/chardet-0.4.2.tgz#b5473b33dc97c424e5d98dc87d55d4d8a29c8bf2"
 
-check-error@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/check-error/-/check-error-1.0.2.tgz#574d312edd88bb5dd8912e9286dd6c0aed4aac82"
-
 cheerio@^1.0.0-rc.1:
   version "1.0.0-rc.2"
   resolved "https://registry.yarnpkg.com/cheerio/-/cheerio-1.0.0-rc.2.tgz#4b9f53a81b27e4d5dac31c0ffd0cfa03cc6830db"
@@ -2554,12 +2535,6 @@ dedent@^0.7.0:
   version "0.7.0"
   resolved "https://registry.yarnpkg.com/dedent/-/dedent-0.7.0.tgz#2495ddbaf6eb874abb0e1be9df22d2e5a544326c"
 
-deep-eql@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/deep-eql/-/deep-eql-3.0.1.tgz#dfc9404400ad1c8fe023e7da1df1c147c4b444df"
-  dependencies:
-    type-detect "^4.0.0"
-
 deep-extend@~0.4.0:
   version "0.4.2"
   resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.4.2.tgz#48b699c27e334bf89f10892be432f6e4c7d34a7f"
@@ -3513,10 +3488,6 @@ get-caller-file@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-1.0.2.tgz#f702e63127e7e231c160a80c1554acb70d5047e5"
 
-get-func-name@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/get-func-name/-/get-func-name-2.0.0.tgz#ead774abee72e20409433a066366023dd6887a41"
-
 get-own-enumerable-property-symbols@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/get-own-enumerable-property-symbols/-/get-own-enumerable-property-symbols-2.0.1.tgz#5c4ad87f2834c4b9b4e84549dc1e0650fb38c24b"
@@ -6217,10 +6188,6 @@ path-type@^3.0.0:
   dependencies:
     pify "^3.0.0"
 
-pathval@^1.0.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.0.tgz#b942e6d4bde653005ef6b71361def8727d0645e0"
-
 pbkdf2@^3.0.3:
   version "3.0.14"
   resolved "https://registry.yarnpkg.com/pbkdf2/-/pbkdf2-3.0.14.tgz#a35e13c64799b06ce15320f459c230e68e73bade"
@@ -7634,10 +7601,6 @@ type-check@~0.3.2:
   dependencies:
     prelude-ls "~1.1.2"
 
-type-detect@^4.0.0:
-  version "4.0.8"
-  resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-4.0.8.tgz#7646fb5f18871cfbb7749e69bd39a6388eb7450c"
-
 typedarray@^0.0.6, typedarray@~0.0.5:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"