diff --git a/src/parser/expression.js b/src/parser/expression.js
index 242a390564..23f6875077 100644
--- a/src/parser/expression.js
+++ b/src/parser/expression.js
@@ -665,7 +665,8 @@ export default class ExpressionParser extends LValParser {
     }
   }
 
-  parseParenItem(node: N.Expression): N.Expression {
+  // eslint-disable-next-line no-unused-vars
+  parseParenItem(node: N.Expression, startPos: number, startLoc: Position): N.Expression {
     return node;
   }
 
@@ -705,6 +706,7 @@ export default class ExpressionParser extends LValParser {
     const elem = this.startNode();
     if (this.state.value === null) {
       if (!isTagged) {
+        // $FlowFixMe
         this.raise(this.state.invalidTemplateEscapePosition, "Invalid escape sequence in template");
       } else {
         this.state.invalidTemplateEscapePosition = null;
@@ -846,7 +848,7 @@ export default class ExpressionParser extends LValParser {
         this.match(tt.num) || // get 1() {}
         this.match(tt.bracketL) || // get ["string"]() {}
         this.match(tt.name) || // get foo() {}
-        this.state.type.keyword // get debugger() {}
+        !!this.state.type.keyword // get debugger() {}
       );
   }
 
@@ -1036,7 +1038,7 @@ export default class ExpressionParser extends LValParser {
   // nothing in between them to be parsed as `null` (which is needed
   // for array literals).
 
-  parseExprList(close: TokenType, allowEmpty?: boolean, refShorthandDefaultPos?: Pos): $ReadOnlyArray<?N.Expression> {
+  parseExprList(close: TokenType, allowEmpty?: boolean, refShorthandDefaultPos?: ?Pos): $ReadOnlyArray<?N.Expression> {
     const elts = [];
     let first = true;
 
diff --git a/src/parser/statement.js b/src/parser/statement.js
index 153b614ce0..f29b2c29a3 100644
--- a/src/parser/statement.js
+++ b/src/parser/statement.js
@@ -74,6 +74,7 @@ export default class StatementParser extends ExpressionParser {
     // complexity.
 
     switch (starttype) {
+      // $FlowFixMe
       case tt._break: case tt._continue: return this.parseBreakContinueStatement(node, starttype.keyword);
       case tt._debugger: return this.parseDebuggerStatement(node);
       case tt._do: return this.parseDoStatement(node);
@@ -554,6 +555,7 @@ export default class StatementParser extends ExpressionParser {
 
   parseVar(node: N.VariableDeclaration, isFor: boolean, kind: TokenType): N.VariableDeclaration {
     const declarations = node.declarations = [];
+    // $FlowFixMe
     node.kind = kind.keyword;
     for (;;) {
       const decl = this.startNode();
@@ -887,7 +889,8 @@ export default class StatementParser extends ExpressionParser {
     return this.finishNode(node, "ExportNamedDeclaration");
   }
 
-  parseExportDeclaration(): N.Declaration {
+  // eslint-disable-next-line no-unused-vars
+  parseExportDeclaration(node: N.ExportNamedDeclaration): ?N.Declaration {
     return this.parseStatement(true);
   }
 
diff --git a/src/plugins/estree.js b/src/plugins/estree.js
index e4b7041774..347d325378 100644
--- a/src/plugins/estree.js
+++ b/src/plugins/estree.js
@@ -132,10 +132,11 @@ export default (superClass: Class<Parser>): Class<Parser> => class extends super
     delete node.directives;
   }
 
-  parseClassMethod(classBody, ...args) {
+  parseClassMethod(classBody: N.ClassBody, ...args) {
     super.parseClassMethod(classBody, ...args);
 
     const body = classBody.body;
+    // $FlowIgnore
     body[body.length - 1].type = "MethodDefinition";
   }
 
@@ -185,7 +186,9 @@ export default (superClass: Class<Parser>): Class<Parser> => class extends super
     const node = super.parseObjectMethod(...args);
 
     if (node) {
+      // $FlowIgnore
       if (node.kind === "method") node.kind = "init";
+      // $FlowIgnore
       node.type = "Property";
     }
 
@@ -196,7 +199,9 @@ export default (superClass: Class<Parser>): Class<Parser> => class extends super
     const node = super.parseObjectProperty(...args);
 
     if (node) {
+      // $FlowIgnore
       node.kind = "init";
+      // $FlowIgnore
       node.type = "Property";
     }