diff --git a/.eslintrc.js b/.eslintrc.js
index c02abfbd7a8d..1deda3b592ca 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -87,6 +87,10 @@ module.exports = {
     'no-mixed-operators': 'error',
     'no-console': 'error',
     'no-process-exit': 'error',
+    'no-fallthrough': [
+      'warn',
+      { commentPattern: '.*intentional fallthrough.*' },
+    ],
 
     //
     // eslint-plugin-eslint-comment
diff --git a/README.md b/README.md
index d8abbe324a96..25a1a58f3eda 100644
--- a/README.md
+++ b/README.md
@@ -233,7 +233,7 @@ The latest version under the `canary` tag **(latest commit to master)** is:
 
 ## Supported TypeScript Version
 
-**The version range of TypeScript currently supported by this parser is `>=3.3.1 <4.3.0`.**
+**The version range of TypeScript currently supported by this parser is `>=3.3.1 <4.4.0`.**
 
 These versions are what we test against.
 
diff --git a/package.json b/package.json
index 61fff8533211..ea5995ab64d2 100644
--- a/package.json
+++ b/package.json
@@ -113,9 +113,9 @@
     "ts-jest": "^26.5.1",
     "ts-node": "^9.0.0",
     "tslint": "^6.1.3",
-    "typescript": ">=3.3.1 <4.3.0"
+    "typescript": ">=3.3.1 <4.4.0 || 4.3.1-rc"
   },
   "resolutions": {
-    "typescript": "4.2.2"
+    "typescript": "4.3.1-rc"
   }
 }
diff --git a/packages/ast-spec/src/element/TSMethodSignature/spec.ts b/packages/ast-spec/src/element/TSMethodSignature/spec.ts
index 76b2e71ab3ad..5ca7cbead3e0 100644
--- a/packages/ast-spec/src/element/TSMethodSignature/spec.ts
+++ b/packages/ast-spec/src/element/TSMethodSignature/spec.ts
@@ -22,6 +22,7 @@ interface TSMethodSignatureBase extends BaseNode {
   accessibility?: Accessibility;
   export?: boolean;
   static?: boolean;
+  kind: 'get' | 'method' | 'set';
 }
 
 export interface TSMethodSignatureComputedName extends TSMethodSignatureBase {
diff --git a/packages/eslint-plugin/src/rules/dot-notation.ts b/packages/eslint-plugin/src/rules/dot-notation.ts
index 055b97ecab25..b93dc8d035a7 100644
--- a/packages/eslint-plugin/src/rules/dot-notation.ts
+++ b/packages/eslint-plugin/src/rules/dot-notation.ts
@@ -77,6 +77,7 @@ export default createRule<Options, MessageIds>({
       (options.allowIndexSignaturePropertyAccess ?? false) ||
       tsutils.isCompilerOptionEnabled(
         program.getCompilerOptions(),
+        // @ts-expect-error - TS is refining the type to never for some reason
         'noPropertyAccessFromIndexSignature',
       );
 
diff --git a/packages/shared-fixtures/fixtures/typescript/types/interface-with-accessors.src.ts b/packages/shared-fixtures/fixtures/typescript/types/interface-with-accessors.src.ts
new file mode 100644
index 000000000000..d4eda64b2187
--- /dev/null
+++ b/packages/shared-fixtures/fixtures/typescript/types/interface-with-accessors.src.ts
@@ -0,0 +1,4 @@
+interface Thing {
+  get size(): number;
+  set size(value: number | string | boolean);
+}
diff --git a/packages/shared-fixtures/fixtures/typescript/types/object-literal-type-with-accessors.src.ts b/packages/shared-fixtures/fixtures/typescript/types/object-literal-type-with-accessors.src.ts
new file mode 100644
index 000000000000..61666608a103
--- /dev/null
+++ b/packages/shared-fixtures/fixtures/typescript/types/object-literal-type-with-accessors.src.ts
@@ -0,0 +1,4 @@
+type Thing = {
+  get size(): number;
+  set size(value: number | string | boolean);
+};
diff --git a/packages/typescript-estree/package.json b/packages/typescript-estree/package.json
index a350c25ef9d3..15e1ec911bc1 100644
--- a/packages/typescript-estree/package.json
+++ b/packages/typescript-estree/package.json
@@ -51,8 +51,8 @@
   },
   "devDependencies": {
     "@babel/code-frame": "^7.12.13",
-    "@babel/parser": "^7.13.11",
-    "@babel/types": "^7.13.0",
+    "@babel/parser": "^7.14.3",
+    "@babel/types": "^7.14.2",
     "@types/babel__code-frame": "*",
     "@types/debug": "*",
     "@types/glob": "*",
diff --git a/packages/typescript-estree/src/convert.ts b/packages/typescript-estree/src/convert.ts
index aad29f9b1467..595d284237c4 100644
--- a/packages/typescript-estree/src/convert.ts
+++ b/packages/typescript-estree/src/convert.ts
@@ -500,7 +500,7 @@ export class Converter {
     Object.entries<any>(node)
       .filter(
         ([key]) =>
-          !/^(?:_children|kind|parent|pos|end|flags|modifierFlagsCache|jsDoc|type|typeArguments|typeParameters|decorators)$/.test(
+          !/^(?:_children|kind|parent|pos|end|flags|modifierFlagsCache|jsDoc|type|typeArguments|typeParameters|decorators|transformFlags)$/.test(
             key,
           ),
       )
@@ -593,6 +593,65 @@ export class Converter {
     return result;
   }
 
+  private convertMethodSignature(
+    node:
+      | ts.MethodSignature
+      | ts.GetAccessorDeclaration
+      | ts.SetAccessorDeclaration,
+  ): TSESTree.TSMethodSignature {
+    const result = this.createNode<TSESTree.TSMethodSignature>(node, {
+      type: AST_NODE_TYPES.TSMethodSignature,
+      computed: isComputedProperty(node.name),
+      key: this.convertChild(node.name),
+      params: this.convertParameters(node.parameters),
+      kind: ((): 'get' | 'set' | 'method' => {
+        switch (node.kind) {
+          case SyntaxKind.GetAccessor:
+            return 'get';
+
+          case SyntaxKind.SetAccessor:
+            return 'set';
+
+          case SyntaxKind.MethodSignature:
+            return 'method';
+        }
+      })(),
+    });
+
+    if (isOptional(node)) {
+      result.optional = true;
+    }
+
+    if (node.type) {
+      result.returnType = this.convertTypeAnnotation(node.type, node);
+    }
+
+    if (hasModifier(SyntaxKind.ReadonlyKeyword, node)) {
+      result.readonly = true;
+    }
+
+    if (node.typeParameters) {
+      result.typeParameters = this.convertTSTypeParametersToTypeParametersDeclaration(
+        node.typeParameters,
+      );
+    }
+
+    const accessibility = getTSNodeAccessibility(node);
+    if (accessibility) {
+      result.accessibility = accessibility;
+    }
+
+    if (hasModifier(SyntaxKind.ExportKeyword, node)) {
+      result.export = true;
+    }
+
+    if (hasModifier(SyntaxKind.StaticKeyword, node)) {
+      result.static = true;
+    }
+
+    return result;
+  }
+
   /**
    * Applies the given TS modifiers to the given result object.
    * @param result
@@ -1069,7 +1128,15 @@ export class Converter {
       }
 
       case SyntaxKind.GetAccessor:
-      case SyntaxKind.SetAccessor:
+      case SyntaxKind.SetAccessor: {
+        if (
+          node.parent.kind === SyntaxKind.InterfaceDeclaration ||
+          node.parent.kind === SyntaxKind.TypeLiteral
+        ) {
+          return this.convertMethodSignature(node);
+        }
+      }
+      // otherwise, it is a non-type accessor - intentional fallthrough
       case SyntaxKind.MethodDeclaration: {
         const method = this.createNode<
           TSESTree.TSEmptyBodyFunctionExpression | TSESTree.FunctionExpression
@@ -2340,44 +2407,7 @@ export class Converter {
       }
 
       case SyntaxKind.MethodSignature: {
-        const result = this.createNode<TSESTree.TSMethodSignature>(node, {
-          type: AST_NODE_TYPES.TSMethodSignature,
-          computed: isComputedProperty(node.name),
-          key: this.convertChild(node.name),
-          params: this.convertParameters(node.parameters),
-        });
-
-        if (isOptional(node)) {
-          result.optional = true;
-        }
-
-        if (node.type) {
-          result.returnType = this.convertTypeAnnotation(node.type, node);
-        }
-
-        if (hasModifier(SyntaxKind.ReadonlyKeyword, node)) {
-          result.readonly = true;
-        }
-
-        if (node.typeParameters) {
-          result.typeParameters = this.convertTSTypeParametersToTypeParametersDeclaration(
-            node.typeParameters,
-          );
-        }
-
-        const accessibility = getTSNodeAccessibility(node);
-        if (accessibility) {
-          result.accessibility = accessibility;
-        }
-
-        if (hasModifier(SyntaxKind.ExportKeyword, node)) {
-          result.export = true;
-        }
-
-        if (hasModifier(SyntaxKind.StaticKeyword, node)) {
-          result.static = true;
-        }
-        return result;
+        return this.convertMethodSignature(node);
       }
 
       case SyntaxKind.PropertySignature: {
diff --git a/packages/typescript-estree/src/parser.ts b/packages/typescript-estree/src/parser.ts
index 300a73c6f1db..fdbeaa6fa069 100644
--- a/packages/typescript-estree/src/parser.ts
+++ b/packages/typescript-estree/src/parser.ts
@@ -25,12 +25,12 @@ const log = debug('typescript-eslint:typescript-estree:parser');
  * This needs to be kept in sync with the top-level README.md in the
  * typescript-eslint monorepo
  */
-const SUPPORTED_TYPESCRIPT_VERSIONS = '>=3.3.1 <4.3.0';
+const SUPPORTED_TYPESCRIPT_VERSIONS = '>=3.3.1 <4.4.0';
 /*
  * The semver package will ignore prerelease ranges, and we don't want to explicitly document every one
  * List them all separately here, so we can automatically create the full string
  */
-const SUPPORTED_PRERELEASE_RANGES: string[] = ['4.1.1-rc', '4.1.0-beta'];
+const SUPPORTED_PRERELEASE_RANGES: string[] = ['4.3.0-beta', '4.3.1-rc'];
 const ACTIVE_TYPESCRIPT_VERSION = ts.version;
 const isRunningSupportedTypeScriptVersion = semver.satisfies(
   ACTIVE_TYPESCRIPT_VERSION,
diff --git a/packages/typescript-estree/src/ts-estree/estree-to-ts-node-types.ts b/packages/typescript-estree/src/ts-estree/estree-to-ts-node-types.ts
index 92ef8c42e604..0f74c42ac64f 100644
--- a/packages/typescript-estree/src/ts-estree/estree-to-ts-node-types.ts
+++ b/packages/typescript-estree/src/ts-estree/estree-to-ts-node-types.ts
@@ -180,7 +180,10 @@ export interface EstreeToTsNodeTypes {
   [AST_NODE_TYPES.TSIntersectionType]: ts.IntersectionTypeNode;
   [AST_NODE_TYPES.TSLiteralType]: ts.LiteralTypeNode;
   [AST_NODE_TYPES.TSMappedType]: ts.MappedTypeNode;
-  [AST_NODE_TYPES.TSMethodSignature]: ts.MethodSignature;
+  [AST_NODE_TYPES.TSMethodSignature]:
+    | ts.MethodSignature
+    | ts.GetAccessorDeclaration
+    | ts.SetAccessorDeclaration;
   [AST_NODE_TYPES.TSModuleBlock]: ts.ModuleBlock;
   [AST_NODE_TYPES.TSModuleDeclaration]: ts.ModuleDeclaration;
   [AST_NODE_TYPES.TSNamedTupleMember]: ts.NamedTupleMember;
diff --git a/packages/typescript-estree/tests/lib/__snapshots__/convert.test.ts.snap b/packages/typescript-estree/tests/lib/__snapshots__/convert.test.ts.snap
index 7da28080eb36..ef7abcee4f4a 100644
--- a/packages/typescript-estree/tests/lib/__snapshots__/convert.test.ts.snap
+++ b/packages/typescript-estree/tests/lib/__snapshots__/convert.test.ts.snap
@@ -22,7 +22,6 @@ Object {
       12,
       12,
     ],
-    "transformFlags": 0,
     "type": "TSEndOfFileToken",
   },
   "externalModuleIndicator": undefined,
@@ -170,7 +169,6 @@ Object {
     },
   ],
   "text": "new foo<T>()",
-  "transformFlags": 9,
   "type": "TSSourceFile",
   "typeReferenceDirectives": Array [],
 }
@@ -210,7 +208,6 @@ Object {
           5,
           8,
         ],
-        "transformFlags": 0,
         "type": "TSUnparsedPrologue",
       },
       "nextContainer": undefined,
@@ -219,7 +216,6 @@ Object {
         35,
       ],
       "symbol": undefined,
-      "transformFlags": 1,
       "type": "TSUnparsedPrologue",
       "typeAnnotation": null,
       "typeParameters": null,
@@ -322,7 +318,6 @@ Object {
     18,
   ],
   "symbol": undefined,
-  "transformFlags": 2305,
   "type": "TSClassDeclaration",
   "typeParameters": null,
 }
@@ -363,7 +358,6 @@ Object {
     0,
     12,
   ],
-  "transformFlags": 9,
   "type": "TSNewExpression",
   "typeParameters": Object {
     "loc": Object {
@@ -464,7 +458,6 @@ Object {
     15,
   ],
   "symbol": undefined,
-  "transformFlags": 257,
   "type": "TSClassDeclaration",
   "typeParameters": Object {
     "loc": Object {
diff --git a/packages/typescript-estree/tests/lib/__snapshots__/semantic-diagnostics-enabled.test.ts.snap b/packages/typescript-estree/tests/lib/__snapshots__/semantic-diagnostics-enabled.test.ts.snap
index 7094769a4ad6..641c388c3ef2 100644
--- a/packages/typescript-estree/tests/lib/__snapshots__/semantic-diagnostics-enabled.test.ts.snap
+++ b/packages/typescript-estree/tests/lib/__snapshots__/semantic-diagnostics-enabled.test.ts.snap
@@ -2639,6 +2639,8 @@ exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" e
 
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/types/indexed.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
 
+exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/types/interface-with-accessors.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
+
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/types/intersection-type.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
 
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/types/literal-number.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
@@ -2661,6 +2663,8 @@ exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" e
 
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/types/nested-types.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
 
+exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/types/object-literal-type-with-accessors.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
+
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/types/parenthesized-type.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
 
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/types/reference.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
diff --git a/packages/typescript-estree/tests/lib/convert.test.ts b/packages/typescript-estree/tests/lib/convert.test.ts
index a95916138d76..b26390b7f750 100644
--- a/packages/typescript-estree/tests/lib/convert.test.ts
+++ b/packages/typescript-estree/tests/lib/convert.test.ts
@@ -19,8 +19,7 @@ describe('convert', () => {
 
     function fakeUnknownKind(node: ts.Node): void {
       ts.forEachChild(node, fakeUnknownKind);
-      // eslint-disable-next-line @typescript-eslint/ban-ts-comment -- intentionally writing to a readonly field
-      // @ts-expect-error
+      // @ts-expect-error -- intentionally writing to a readonly field
       node.kind = ts.SyntaxKind.UnparsedPrologue;
     }
 
diff --git a/packages/typescript-estree/tests/snapshots/jsx/namespace-this-name.src.js.shot b/packages/typescript-estree/tests/snapshots/jsx/namespace-this-name.src.js.shot
index 58e66b804b7e..46d670895846 100644
--- a/packages/typescript-estree/tests/snapshots/jsx/namespace-this-name.src.js.shot
+++ b/packages/typescript-estree/tests/snapshots/jsx/namespace-this-name.src.js.shot
@@ -163,7 +163,7 @@ Object {
         1,
         9,
       ],
-      "type": "Keyword",
+      "type": "JSXIdentifier",
       "value": "this:bar",
     },
     Object {
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/export-default-interface.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/export-default-interface.src.ts.shot
index cfcdd7ad177e..d77785922709 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/export-default-interface.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/export-default-interface.src.ts.shot
@@ -27,6 +27,7 @@ Object {
                 ],
                 "type": "Identifier",
               },
+              "kind": "method",
               "loc": Object {
                 "end": Object {
                   "column": 18,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-all-property-types.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-all-property-types.src.ts.shot
index af58d87e382b..dece748c4b2d 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-all-property-types.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-all-property-types.src.ts.shot
@@ -431,6 +431,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 16,
@@ -502,6 +503,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 24,
@@ -629,6 +631,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 26,
@@ -756,6 +759,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 26,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-jsdoc.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-jsdoc.src.ts.shot
index c20b0a2d981f..c4299c7644cb 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-jsdoc.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-jsdoc.src.ts.shot
@@ -26,6 +26,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 13,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-method.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-method.src.ts.shot
index 537cc8b236fb..f94e34982985 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-method.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-method.src.ts.shot
@@ -26,6 +26,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 23,
@@ -150,6 +151,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 18,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-optional-properties.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-optional-properties.src.ts.shot
index df83385dd287..f0d57792836c 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-optional-properties.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/interface-with-optional-properties.src.ts.shot
@@ -143,6 +143,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 34,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/type-assertion-in-interface.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/type-assertion-in-interface.src.ts.shot
index 06266e5337e8..8cbbcfed1d51 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/type-assertion-in-interface.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/type-assertion-in-interface.src.ts.shot
@@ -26,6 +26,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 36,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/type-assertion-with-guard-in-interface.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/type-assertion-with-guard-in-interface.src.ts.shot
index eae142407996..a26782c10731 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/type-assertion-with-guard-in-interface.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/type-assertion-with-guard-in-interface.src.ts.shot
@@ -26,6 +26,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 46,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/type-guard-in-interface.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/type-guard-in-interface.src.ts.shot
index ff60f3be6e95..a7723369960b 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/type-guard-in-interface.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/type-guard-in-interface.src.ts.shot
@@ -26,6 +26,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 38,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/typed-method-signature.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/typed-method-signature.src.ts.shot
index eefbf73554f3..a175d632669d 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/typed-method-signature.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/typed-method-signature.src.ts.shot
@@ -69,6 +69,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 23,
@@ -193,6 +194,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 18,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/typed-this.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/typed-this.src.ts.shot
index 10ab794d02d7..bfd4fd36e9e7 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/basics/typed-this.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/typed-this.src.ts.shot
@@ -26,6 +26,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 65,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/empty-type-parameters-in-method-signature.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/empty-type-parameters-in-method-signature.src.ts.shot
index 471b29c33cd9..bb110cf05755 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/empty-type-parameters-in-method-signature.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/empty-type-parameters-in-method-signature.src.ts.shot
@@ -26,6 +26,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 11,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/enum-with-keywords.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/enum-with-keywords.src.ts.shot
index 2a93eb27f3d4..8eb4625590f3 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/enum-with-keywords.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/enum-with-keywords.src.ts.shot
@@ -50,7 +50,6 @@ Object {
               7,
               14,
             ],
-            "transformFlags": 1,
             "type": "TSPrivateKeyword",
           },
           Object {
@@ -68,7 +67,6 @@ Object {
               15,
               21,
             ],
-            "transformFlags": 1,
             "type": "TSPublicKeyword",
           },
           Object {
@@ -86,7 +84,6 @@ Object {
               22,
               31,
             ],
-            "transformFlags": 1,
             "type": "TSProtectedKeyword",
           },
           Object {
@@ -104,7 +101,6 @@ Object {
               32,
               38,
             ],
-            "transformFlags": 256,
             "type": "TSStaticKeyword",
           },
           Object {
@@ -122,7 +118,6 @@ Object {
               39,
               47,
             ],
-            "transformFlags": 1,
             "type": "TSReadonlyKeyword",
           },
           Object {
@@ -157,7 +152,6 @@ Object {
               57,
               62,
             ],
-            "transformFlags": 96,
             "type": "TSAsyncKeyword",
           },
         ],
diff --git a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-export.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-export.src.ts.shot
index 2827b9747e8e..49552e632b94 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-export.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-export.src.ts.shot
@@ -27,6 +27,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 32,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-private.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-private.src.ts.shot
index 6c4af2099000..0b2fc02bfd56 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-private.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-private.src.ts.shot
@@ -27,6 +27,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 33,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-protected.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-protected.src.ts.shot
index e5159f9940b8..1826aeadf4e4 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-protected.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-protected.src.ts.shot
@@ -27,6 +27,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 33,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-public.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-public.src.ts.shot
index 5a2b17449608..114bd1a78112 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-public.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-public.src.ts.shot
@@ -27,6 +27,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 32,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-readonly.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-readonly.src.ts.shot
index 521a3a4bcdc4..e1a82d8ecdaa 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-readonly.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-readonly.src.ts.shot
@@ -26,6 +26,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 32,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-static.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-static.src.ts.shot
index bdb4baa843a2..8aab33054a95 100644
--- a/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-static.src.ts.shot
+++ b/packages/typescript-estree/tests/snapshots/typescript/errorRecovery/interface-method-static.src.ts.shot
@@ -26,6 +26,7 @@ Object {
               ],
               "type": "Identifier",
             },
+            "kind": "method",
             "loc": Object {
               "end": Object {
                 "column": 30,
diff --git a/packages/typescript-estree/tests/snapshots/typescript/types/interface-with-accessors.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/types/interface-with-accessors.src.ts.shot
new file mode 100644
index 000000000000..02601964ea1b
--- /dev/null
+++ b/packages/typescript-estree/tests/snapshots/typescript/types/interface-with-accessors.src.ts.shot
@@ -0,0 +1,711 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`typescript types interface-with-accessors.src 1`] = `
+Object {
+  "body": Array [
+    Object {
+      "body": Object {
+        "body": Array [
+          Object {
+            "computed": false,
+            "key": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 10,
+                  "line": 2,
+                },
+                "start": Object {
+                  "column": 6,
+                  "line": 2,
+                },
+              },
+              "name": "size",
+              "range": Array [
+                24,
+                28,
+              ],
+              "type": "Identifier",
+            },
+            "kind": "get",
+            "loc": Object {
+              "end": Object {
+                "column": 21,
+                "line": 2,
+              },
+              "start": Object {
+                "column": 2,
+                "line": 2,
+              },
+            },
+            "params": Array [],
+            "range": Array [
+              20,
+              39,
+            ],
+            "returnType": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 20,
+                  "line": 2,
+                },
+                "start": Object {
+                  "column": 12,
+                  "line": 2,
+                },
+              },
+              "range": Array [
+                30,
+                38,
+              ],
+              "type": "TSTypeAnnotation",
+              "typeAnnotation": Object {
+                "loc": Object {
+                  "end": Object {
+                    "column": 20,
+                    "line": 2,
+                  },
+                  "start": Object {
+                    "column": 14,
+                    "line": 2,
+                  },
+                },
+                "range": Array [
+                  32,
+                  38,
+                ],
+                "type": "TSNumberKeyword",
+              },
+            },
+            "type": "TSMethodSignature",
+          },
+          Object {
+            "computed": false,
+            "key": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 10,
+                  "line": 3,
+                },
+                "start": Object {
+                  "column": 6,
+                  "line": 3,
+                },
+              },
+              "name": "size",
+              "range": Array [
+                46,
+                50,
+              ],
+              "type": "Identifier",
+            },
+            "kind": "set",
+            "loc": Object {
+              "end": Object {
+                "column": 45,
+                "line": 3,
+              },
+              "start": Object {
+                "column": 2,
+                "line": 3,
+              },
+            },
+            "params": Array [
+              Object {
+                "loc": Object {
+                  "end": Object {
+                    "column": 43,
+                    "line": 3,
+                  },
+                  "start": Object {
+                    "column": 11,
+                    "line": 3,
+                  },
+                },
+                "name": "value",
+                "range": Array [
+                  51,
+                  83,
+                ],
+                "type": "Identifier",
+                "typeAnnotation": Object {
+                  "loc": Object {
+                    "end": Object {
+                      "column": 43,
+                      "line": 3,
+                    },
+                    "start": Object {
+                      "column": 16,
+                      "line": 3,
+                    },
+                  },
+                  "range": Array [
+                    56,
+                    83,
+                  ],
+                  "type": "TSTypeAnnotation",
+                  "typeAnnotation": Object {
+                    "loc": Object {
+                      "end": Object {
+                        "column": 43,
+                        "line": 3,
+                      },
+                      "start": Object {
+                        "column": 18,
+                        "line": 3,
+                      },
+                    },
+                    "range": Array [
+                      58,
+                      83,
+                    ],
+                    "type": "TSUnionType",
+                    "types": Array [
+                      Object {
+                        "loc": Object {
+                          "end": Object {
+                            "column": 24,
+                            "line": 3,
+                          },
+                          "start": Object {
+                            "column": 18,
+                            "line": 3,
+                          },
+                        },
+                        "range": Array [
+                          58,
+                          64,
+                        ],
+                        "type": "TSNumberKeyword",
+                      },
+                      Object {
+                        "loc": Object {
+                          "end": Object {
+                            "column": 33,
+                            "line": 3,
+                          },
+                          "start": Object {
+                            "column": 27,
+                            "line": 3,
+                          },
+                        },
+                        "range": Array [
+                          67,
+                          73,
+                        ],
+                        "type": "TSStringKeyword",
+                      },
+                      Object {
+                        "loc": Object {
+                          "end": Object {
+                            "column": 43,
+                            "line": 3,
+                          },
+                          "start": Object {
+                            "column": 36,
+                            "line": 3,
+                          },
+                        },
+                        "range": Array [
+                          76,
+                          83,
+                        ],
+                        "type": "TSBooleanKeyword",
+                      },
+                    ],
+                  },
+                },
+              },
+            ],
+            "range": Array [
+              42,
+              85,
+            ],
+            "type": "TSMethodSignature",
+          },
+        ],
+        "loc": Object {
+          "end": Object {
+            "column": 1,
+            "line": 4,
+          },
+          "start": Object {
+            "column": 16,
+            "line": 1,
+          },
+        },
+        "range": Array [
+          16,
+          87,
+        ],
+        "type": "TSInterfaceBody",
+      },
+      "id": Object {
+        "loc": Object {
+          "end": Object {
+            "column": 15,
+            "line": 1,
+          },
+          "start": Object {
+            "column": 10,
+            "line": 1,
+          },
+        },
+        "name": "Thing",
+        "range": Array [
+          10,
+          15,
+        ],
+        "type": "Identifier",
+      },
+      "loc": Object {
+        "end": Object {
+          "column": 1,
+          "line": 4,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        0,
+        87,
+      ],
+      "type": "TSInterfaceDeclaration",
+    },
+  ],
+  "comments": Array [],
+  "loc": Object {
+    "end": Object {
+      "column": 0,
+      "line": 5,
+    },
+    "start": Object {
+      "column": 0,
+      "line": 1,
+    },
+  },
+  "range": Array [
+    0,
+    88,
+  ],
+  "sourceType": "script",
+  "tokens": Array [
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 9,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        0,
+        9,
+      ],
+      "type": "Keyword",
+      "value": "interface",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 15,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 10,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        10,
+        15,
+      ],
+      "type": "Identifier",
+      "value": "Thing",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 17,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 16,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        16,
+        17,
+      ],
+      "type": "Punctuator",
+      "value": "{",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 5,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 2,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        20,
+        23,
+      ],
+      "type": "Identifier",
+      "value": "get",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 10,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 6,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        24,
+        28,
+      ],
+      "type": "Identifier",
+      "value": "size",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 11,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 10,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        28,
+        29,
+      ],
+      "type": "Punctuator",
+      "value": "(",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 12,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 11,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        29,
+        30,
+      ],
+      "type": "Punctuator",
+      "value": ")",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 13,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 12,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        30,
+        31,
+      ],
+      "type": "Punctuator",
+      "value": ":",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 20,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 14,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        32,
+        38,
+      ],
+      "type": "Identifier",
+      "value": "number",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 21,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 20,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        38,
+        39,
+      ],
+      "type": "Punctuator",
+      "value": ";",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 5,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 2,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        42,
+        45,
+      ],
+      "type": "Identifier",
+      "value": "set",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 10,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 6,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        46,
+        50,
+      ],
+      "type": "Identifier",
+      "value": "size",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 11,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 10,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        50,
+        51,
+      ],
+      "type": "Punctuator",
+      "value": "(",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 16,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 11,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        51,
+        56,
+      ],
+      "type": "Identifier",
+      "value": "value",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 17,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 16,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        56,
+        57,
+      ],
+      "type": "Punctuator",
+      "value": ":",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 24,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 18,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        58,
+        64,
+      ],
+      "type": "Identifier",
+      "value": "number",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 26,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 25,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        65,
+        66,
+      ],
+      "type": "Punctuator",
+      "value": "|",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 33,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 27,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        67,
+        73,
+      ],
+      "type": "Identifier",
+      "value": "string",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 35,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 34,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        74,
+        75,
+      ],
+      "type": "Punctuator",
+      "value": "|",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 43,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 36,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        76,
+        83,
+      ],
+      "type": "Identifier",
+      "value": "boolean",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 44,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 43,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        83,
+        84,
+      ],
+      "type": "Punctuator",
+      "value": ")",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 45,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 44,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        84,
+        85,
+      ],
+      "type": "Punctuator",
+      "value": ";",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 1,
+          "line": 4,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 4,
+        },
+      },
+      "range": Array [
+        86,
+        87,
+      ],
+      "type": "Punctuator",
+      "value": "}",
+    },
+  ],
+  "type": "Program",
+}
+`;
diff --git a/packages/typescript-estree/tests/snapshots/typescript/types/object-literal-type-with-accessors.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/types/object-literal-type-with-accessors.src.ts.shot
new file mode 100644
index 000000000000..df6ae88ba5d2
--- /dev/null
+++ b/packages/typescript-estree/tests/snapshots/typescript/types/object-literal-type-with-accessors.src.ts.shot
@@ -0,0 +1,747 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`typescript types object-literal-type-with-accessors.src 1`] = `
+Object {
+  "body": Array [
+    Object {
+      "id": Object {
+        "loc": Object {
+          "end": Object {
+            "column": 10,
+            "line": 1,
+          },
+          "start": Object {
+            "column": 5,
+            "line": 1,
+          },
+        },
+        "name": "Thing",
+        "range": Array [
+          5,
+          10,
+        ],
+        "type": "Identifier",
+      },
+      "loc": Object {
+        "end": Object {
+          "column": 2,
+          "line": 4,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        0,
+        85,
+      ],
+      "type": "TSTypeAliasDeclaration",
+      "typeAnnotation": Object {
+        "loc": Object {
+          "end": Object {
+            "column": 1,
+            "line": 4,
+          },
+          "start": Object {
+            "column": 13,
+            "line": 1,
+          },
+        },
+        "members": Array [
+          Object {
+            "computed": false,
+            "key": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 10,
+                  "line": 2,
+                },
+                "start": Object {
+                  "column": 6,
+                  "line": 2,
+                },
+              },
+              "name": "size",
+              "range": Array [
+                21,
+                25,
+              ],
+              "type": "Identifier",
+            },
+            "kind": "get",
+            "loc": Object {
+              "end": Object {
+                "column": 21,
+                "line": 2,
+              },
+              "start": Object {
+                "column": 2,
+                "line": 2,
+              },
+            },
+            "params": Array [],
+            "range": Array [
+              17,
+              36,
+            ],
+            "returnType": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 20,
+                  "line": 2,
+                },
+                "start": Object {
+                  "column": 12,
+                  "line": 2,
+                },
+              },
+              "range": Array [
+                27,
+                35,
+              ],
+              "type": "TSTypeAnnotation",
+              "typeAnnotation": Object {
+                "loc": Object {
+                  "end": Object {
+                    "column": 20,
+                    "line": 2,
+                  },
+                  "start": Object {
+                    "column": 14,
+                    "line": 2,
+                  },
+                },
+                "range": Array [
+                  29,
+                  35,
+                ],
+                "type": "TSNumberKeyword",
+              },
+            },
+            "type": "TSMethodSignature",
+          },
+          Object {
+            "computed": false,
+            "key": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 10,
+                  "line": 3,
+                },
+                "start": Object {
+                  "column": 6,
+                  "line": 3,
+                },
+              },
+              "name": "size",
+              "range": Array [
+                43,
+                47,
+              ],
+              "type": "Identifier",
+            },
+            "kind": "set",
+            "loc": Object {
+              "end": Object {
+                "column": 45,
+                "line": 3,
+              },
+              "start": Object {
+                "column": 2,
+                "line": 3,
+              },
+            },
+            "params": Array [
+              Object {
+                "loc": Object {
+                  "end": Object {
+                    "column": 43,
+                    "line": 3,
+                  },
+                  "start": Object {
+                    "column": 11,
+                    "line": 3,
+                  },
+                },
+                "name": "value",
+                "range": Array [
+                  48,
+                  80,
+                ],
+                "type": "Identifier",
+                "typeAnnotation": Object {
+                  "loc": Object {
+                    "end": Object {
+                      "column": 43,
+                      "line": 3,
+                    },
+                    "start": Object {
+                      "column": 16,
+                      "line": 3,
+                    },
+                  },
+                  "range": Array [
+                    53,
+                    80,
+                  ],
+                  "type": "TSTypeAnnotation",
+                  "typeAnnotation": Object {
+                    "loc": Object {
+                      "end": Object {
+                        "column": 43,
+                        "line": 3,
+                      },
+                      "start": Object {
+                        "column": 18,
+                        "line": 3,
+                      },
+                    },
+                    "range": Array [
+                      55,
+                      80,
+                    ],
+                    "type": "TSUnionType",
+                    "types": Array [
+                      Object {
+                        "loc": Object {
+                          "end": Object {
+                            "column": 24,
+                            "line": 3,
+                          },
+                          "start": Object {
+                            "column": 18,
+                            "line": 3,
+                          },
+                        },
+                        "range": Array [
+                          55,
+                          61,
+                        ],
+                        "type": "TSNumberKeyword",
+                      },
+                      Object {
+                        "loc": Object {
+                          "end": Object {
+                            "column": 33,
+                            "line": 3,
+                          },
+                          "start": Object {
+                            "column": 27,
+                            "line": 3,
+                          },
+                        },
+                        "range": Array [
+                          64,
+                          70,
+                        ],
+                        "type": "TSStringKeyword",
+                      },
+                      Object {
+                        "loc": Object {
+                          "end": Object {
+                            "column": 43,
+                            "line": 3,
+                          },
+                          "start": Object {
+                            "column": 36,
+                            "line": 3,
+                          },
+                        },
+                        "range": Array [
+                          73,
+                          80,
+                        ],
+                        "type": "TSBooleanKeyword",
+                      },
+                    ],
+                  },
+                },
+              },
+            ],
+            "range": Array [
+              39,
+              82,
+            ],
+            "type": "TSMethodSignature",
+          },
+        ],
+        "range": Array [
+          13,
+          84,
+        ],
+        "type": "TSTypeLiteral",
+      },
+    },
+  ],
+  "comments": Array [],
+  "loc": Object {
+    "end": Object {
+      "column": 0,
+      "line": 5,
+    },
+    "start": Object {
+      "column": 0,
+      "line": 1,
+    },
+  },
+  "range": Array [
+    0,
+    86,
+  ],
+  "sourceType": "script",
+  "tokens": Array [
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 4,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        0,
+        4,
+      ],
+      "type": "Identifier",
+      "value": "type",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 10,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 5,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        5,
+        10,
+      ],
+      "type": "Identifier",
+      "value": "Thing",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 12,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 11,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        11,
+        12,
+      ],
+      "type": "Punctuator",
+      "value": "=",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 14,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 13,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        13,
+        14,
+      ],
+      "type": "Punctuator",
+      "value": "{",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 5,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 2,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        17,
+        20,
+      ],
+      "type": "Identifier",
+      "value": "get",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 10,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 6,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        21,
+        25,
+      ],
+      "type": "Identifier",
+      "value": "size",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 11,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 10,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        25,
+        26,
+      ],
+      "type": "Punctuator",
+      "value": "(",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 12,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 11,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        26,
+        27,
+      ],
+      "type": "Punctuator",
+      "value": ")",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 13,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 12,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        27,
+        28,
+      ],
+      "type": "Punctuator",
+      "value": ":",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 20,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 14,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        29,
+        35,
+      ],
+      "type": "Identifier",
+      "value": "number",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 21,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 20,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        35,
+        36,
+      ],
+      "type": "Punctuator",
+      "value": ";",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 5,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 2,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        39,
+        42,
+      ],
+      "type": "Identifier",
+      "value": "set",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 10,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 6,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        43,
+        47,
+      ],
+      "type": "Identifier",
+      "value": "size",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 11,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 10,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        47,
+        48,
+      ],
+      "type": "Punctuator",
+      "value": "(",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 16,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 11,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        48,
+        53,
+      ],
+      "type": "Identifier",
+      "value": "value",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 17,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 16,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        53,
+        54,
+      ],
+      "type": "Punctuator",
+      "value": ":",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 24,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 18,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        55,
+        61,
+      ],
+      "type": "Identifier",
+      "value": "number",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 26,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 25,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        62,
+        63,
+      ],
+      "type": "Punctuator",
+      "value": "|",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 33,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 27,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        64,
+        70,
+      ],
+      "type": "Identifier",
+      "value": "string",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 35,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 34,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        71,
+        72,
+      ],
+      "type": "Punctuator",
+      "value": "|",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 43,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 36,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        73,
+        80,
+      ],
+      "type": "Identifier",
+      "value": "boolean",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 44,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 43,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        80,
+        81,
+      ],
+      "type": "Punctuator",
+      "value": ")",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 45,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 44,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        81,
+        82,
+      ],
+      "type": "Punctuator",
+      "value": ";",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 1,
+          "line": 4,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 4,
+        },
+      },
+      "range": Array [
+        83,
+        84,
+      ],
+      "type": "Punctuator",
+      "value": "}",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 2,
+          "line": 4,
+        },
+        "start": Object {
+          "column": 1,
+          "line": 4,
+        },
+      },
+      "range": Array [
+        84,
+        85,
+      ],
+      "type": "Punctuator",
+      "value": ";",
+    },
+  ],
+  "type": "Program",
+}
+`;
diff --git a/yarn.lock b/yarn.lock
index 2d44f73beda8..281160f5ca14 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -171,11 +171,16 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
-"@babel/parser@^7.1.0", "@babel/parser@^7.12.13", "@babel/parser@^7.13.0", "@babel/parser@^7.13.10", "@babel/parser@^7.13.11":
+"@babel/parser@^7.1.0", "@babel/parser@^7.12.13", "@babel/parser@^7.13.0", "@babel/parser@^7.13.10":
   version "7.13.15"
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.13.15.tgz#8e66775fb523599acb6a289e12929fa5ab0954d8"
   integrity sha512-b9COtcAlVEQljy/9fbcMHpG+UIW9ReF+gpaxDHTlZd0c6/UU9ng8zdySAW9sRTzpvcdCHn6bUcbuYUgGzLAWVQ==
 
+"@babel/parser@^7.14.3":
+  version "7.14.3"
+  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.14.3.tgz#9b530eecb071fd0c93519df25c5ff9f14759f298"
+  integrity sha512-7MpZDIfI7sUC5zWo2+foJ50CSI5lcqDehZ0lVgIhSi4bFEk94fLAKlF3Q0nzSQQ+ca0lm+O6G9ztKVBeu8PMRQ==
+
 "@babel/plugin-syntax-async-generators@^7.8.4":
   version "7.8.4"
   resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-async-generators/-/plugin-syntax-async-generators-7.8.4.tgz#a983fb1aeb2ec3f6ed042a210f640e90e786fe0d"
@@ -291,7 +296,7 @@
     globals "^11.1.0"
     lodash "^4.17.19"
 
-"@babel/types@^7.0.0", "@babel/types@^7.12.13", "@babel/types@^7.13.0", "@babel/types@^7.3.0", "@babel/types@^7.3.3":
+"@babel/types@^7.0.0", "@babel/types@^7.12.13", "@babel/types@^7.13.0", "@babel/types@^7.14.2", "@babel/types@^7.3.0", "@babel/types@^7.3.3":
   version "7.14.2"
   resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.14.2.tgz#4208ae003107ef8a057ea8333e56eb64d2f6a2c3"
   integrity sha512-SdjAG/3DikRHpUOjxZgnkbR11xUlyDMUFJdvnIgZEE16mqmY0BINMmc4//JMJglEmn6i7sq6p+mGrFWyZ98EEw==
@@ -8858,10 +8863,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@*, typescript@4.2.2, "typescript@>=3.3.1 <4.3.0", typescript@^4.1.0-dev.20201026, typescript@~4.2.4:
-  version "4.2.2"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.2.tgz#1450f020618f872db0ea17317d16d8da8ddb8c4c"
-  integrity sha512-tbb+NVrLfnsJy3M59lsDgrzWIflR4d4TIUjz+heUnHZwdF7YsrMTKoRERiIvI2lvBG95dfpLxB21WZhys1bgaQ==
+typescript@*, typescript@4.3.1-rc, "typescript@>=3.3.1 <4.4.0 || 4.3.1-rc", typescript@^4.1.0-dev.20201026, typescript@~4.2.4:
+  version "4.3.1-rc"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.3.1-rc.tgz#925149c8d8514e20a6bd8d4bd7f42adac67ab59c"
+  integrity sha512-L3uJ0gcntaRaKni9aV2amYB+pCDVodKe/B5+IREyvtKGsDOF7cYjchHb/B894skqkgD52ykRuWatIZMqEsHIqA==
 
 uc.micro@^1.0.1, uc.micro@^1.0.5:
   version "1.0.6"