diff --git a/packages/eslint-plugin/src/rules/naming-convention-utils/types.ts b/packages/eslint-plugin/src/rules/naming-convention-utils/types.ts
index d66f9ad13d4..9cff76129db 100644
--- a/packages/eslint-plugin/src/rules/naming-convention-utils/types.ts
+++ b/packages/eslint-plugin/src/rules/naming-convention-utils/types.ts
@@ -60,7 +60,7 @@ interface NormalizedSelector {
 }
 
 type ValidatorFunction = (
-  node: TSESTree.Identifier | TSESTree.Literal,
+  node: TSESTree.Identifier | TSESTree.PrivateIdentifier | TSESTree.Literal,
   modifiers?: Set<Modifiers>,
 ) => void;
 type ParsedOptions = Record<SelectorsString, null | ValidatorFunction>;
diff --git a/packages/eslint-plugin/src/rules/naming-convention-utils/validator.ts b/packages/eslint-plugin/src/rules/naming-convention-utils/validator.ts
index a683933d61b..374302f7f12 100644
--- a/packages/eslint-plugin/src/rules/naming-convention-utils/validator.ts
+++ b/packages/eslint-plugin/src/rules/naming-convention-utils/validator.ts
@@ -25,7 +25,9 @@ function createValidator(
   type: SelectorsString,
   context: Context,
   allConfigs: NormalizedSelector[],
-): (node: TSESTree.Identifier | TSESTree.Literal) => void {
+): (
+  node: TSESTree.Identifier | TSESTree.PrivateIdentifier | TSESTree.Literal,
+) => void {
   // make sure the "highest priority" configs are checked first
   const selectorType = Selectors[type];
   const configs = allConfigs
@@ -70,11 +72,14 @@ function createValidator(
     });
 
   return (
-    node: TSESTree.Identifier | TSESTree.Literal,
+    node: TSESTree.Identifier | TSESTree.PrivateIdentifier | TSESTree.Literal,
     modifiers: Set<Modifiers> = new Set<Modifiers>(),
   ): void => {
     const originalName =
-      node.type === AST_NODE_TYPES.Identifier ? node.name : `${node.value}`;
+      node.type === AST_NODE_TYPES.Identifier ||
+      node.type === AST_NODE_TYPES.PrivateIdentifier
+        ? node.name
+        : `${node.value}`;
 
     // return will break the loop and stop checking configs
     // it is only used when the name is known to have failed or succeeded a config.
@@ -178,7 +183,7 @@ function createValidator(
     position: 'leading' | 'trailing',
     config: NormalizedSelector,
     name: string,
-    node: TSESTree.Identifier | TSESTree.Literal,
+    node: TSESTree.Identifier | TSESTree.PrivateIdentifier | TSESTree.Literal,
     originalName: string,
   ): string | null {
     const option =
@@ -299,7 +304,7 @@ function createValidator(
     position: 'prefix' | 'suffix',
     config: NormalizedSelector,
     name: string,
-    node: TSESTree.Identifier | TSESTree.Literal,
+    node: TSESTree.Identifier | TSESTree.PrivateIdentifier | TSESTree.Literal,
     originalName: string,
   ): string | null {
     const affixes = config[position];
@@ -339,7 +344,7 @@ function createValidator(
   function validateCustom(
     config: NormalizedSelector,
     name: string,
-    node: TSESTree.Identifier | TSESTree.Literal,
+    node: TSESTree.Identifier | TSESTree.PrivateIdentifier | TSESTree.Literal,
     originalName: string,
   ): boolean {
     const custom = config.custom;
@@ -372,7 +377,7 @@ function createValidator(
   function validatePredefinedFormat(
     config: NormalizedSelector,
     name: string,
-    node: TSESTree.Identifier | TSESTree.Literal,
+    node: TSESTree.Identifier | TSESTree.PrivateIdentifier | TSESTree.Literal,
     originalName: string,
   ): boolean {
     const formats = config.format;
diff --git a/packages/eslint-plugin/src/rules/naming-convention.ts b/packages/eslint-plugin/src/rules/naming-convention.ts
index 16e31b62ef8..4c3b9b4b14d 100644
--- a/packages/eslint-plugin/src/rules/naming-convention.ts
+++ b/packages/eslint-plugin/src/rules/naming-convention.ts
@@ -621,11 +621,14 @@ function isGlobal(scope: TSESLint.Scope.Scope | null): boolean {
 }
 
 function requiresQuoting(
-  node: TSESTree.Identifier | TSESTree.Literal,
+  node: TSESTree.Identifier | TSESTree.PrivateIdentifier | TSESTree.Literal,
   target: ScriptTarget | undefined,
 ): boolean {
   const name =
-    node.type === AST_NODE_TYPES.Identifier ? node.name : `${node.value}`;
+    node.type === AST_NODE_TYPES.Identifier ||
+    node.type === AST_NODE_TYPES.PrivateIdentifier
+      ? node.name
+      : `${node.value}`;
   return util.requiresQuoting(name, target);
 }
 
diff --git a/packages/eslint-plugin/src/rules/no-unsafe-assignment.ts b/packages/eslint-plugin/src/rules/no-unsafe-assignment.ts
index 4a8f2a9ea23..97120386a8f 100644
--- a/packages/eslint-plugin/src/rules/no-unsafe-assignment.ts
+++ b/packages/eslint-plugin/src/rules/no-unsafe-assignment.ts
@@ -171,7 +171,8 @@ export default util.createRule({
         let key: string;
         if (receiverProperty.computed === false) {
           key =
-            receiverProperty.key.type === AST_NODE_TYPES.Identifier
+            receiverProperty.key.type === AST_NODE_TYPES.Identifier ||
+            receiverProperty.key.type === AST_NODE_TYPES.PrivateIdentifier
               ? receiverProperty.key.name
               : String(receiverProperty.key.value);
         } else if (receiverProperty.key.type === AST_NODE_TYPES.Literal) {
diff --git a/packages/eslint-plugin/src/rules/prefer-for-of.ts b/packages/eslint-plugin/src/rules/prefer-for-of.ts
index 361ad5ec2cf..112be029600 100644
--- a/packages/eslint-plugin/src/rules/prefer-for-of.ts
+++ b/packages/eslint-plugin/src/rules/prefer-for-of.ts
@@ -43,7 +43,7 @@ export default util.createRule({
     }
 
     function isMatchingIdentifier(
-      node: TSESTree.Expression,
+      node: TSESTree.Expression | TSESTree.PrivateIdentifier,
       name: string,
     ): boolean {
       return node.type === AST_NODE_TYPES.Identifier && node.name === name;
diff --git a/packages/eslint-plugin/src/util/misc.ts b/packages/eslint-plugin/src/util/misc.ts
index 2e6c4711cb0..6f696170e53 100644
--- a/packages/eslint-plugin/src/util/misc.ts
+++ b/packages/eslint-plugin/src/util/misc.ts
@@ -79,7 +79,10 @@ function getNameFromMember(
     | TSESTree.TSPropertySignature,
   sourceCode: TSESLint.SourceCode,
 ): string {
-  if (member.key.type === AST_NODE_TYPES.Identifier) {
+  if (
+    member.key.type === AST_NODE_TYPES.Identifier ||
+    member.key.type === AST_NODE_TYPES.PrivateIdentifier
+  ) {
     return member.key.name;
   }
   if (member.key.type === AST_NODE_TYPES.Literal) {
diff --git a/packages/eslint-plugin/tests/rules/naming-convention.test.ts b/packages/eslint-plugin/tests/rules/naming-convention.test.ts
index f4ed42e3c3e..0f293029a5b 100644
--- a/packages/eslint-plugin/tests/rules/naming-convention.test.ts
+++ b/packages/eslint-plugin/tests/rules/naming-convention.test.ts
@@ -561,6 +561,8 @@ const cases: Cases = [
       'class Ignored { private static readonly % = 1 }',
       'class Ignored { abstract % = 1 }',
       'class Ignored { declare % }',
+      'class Ignored { #% }',
+      'class Ignored { #% = 1 }',
     ],
     options: {
       selector: 'classProperty',
@@ -616,6 +618,7 @@ const cases: Cases = [
       'class Ignored { private % = () => {} }',
       'class Ignored { abstract %() }',
       'class Ignored { declare %() }',
+      'class Ignored { #%() {} }',
     ],
     options: {
       selector: 'classMethod',
@@ -626,6 +629,7 @@ const cases: Cases = [
       'const ignored = { %() {} };',
       'const ignored = { "%"() {} };',
       'const ignored = { %: () => {} };',
+      'const ignored = { #%: () => {} };',
     ],
     options: {
       selector: 'objectLiteralMethod',
@@ -636,6 +640,7 @@ const cases: Cases = [
       'interface Ignored { %(): string }',
       'interface Ignored { "%"(): string }',
       'type Ignored = { %(): string }',
+      'type Ignored = { #%(): string }',
       'type Ignored = { "%"(): string }',
     ],
     options: {
diff --git a/packages/eslint-plugin/tests/rules/no-unsafe-assignment.test.ts b/packages/eslint-plugin/tests/rules/no-unsafe-assignment.test.ts
index 6f3baa3fa1a..27f638f4062 100644
--- a/packages/eslint-plugin/tests/rules/no-unsafe-assignment.test.ts
+++ b/packages/eslint-plugin/tests/rules/no-unsafe-assignment.test.ts
@@ -95,6 +95,11 @@ class Foo {
     `
 class Foo {
   private a = 1;
+}
+    `,
+    `
+class Foo {
+  #a = 1;
 }
     `,
     'const x: Set<string> = new Set();',
@@ -150,6 +155,7 @@ const x = (1 as any), y = 1;
 function foo(a = (1 as any)) {}
 class Foo { constructor(private a = (1 as any)) {} }
 class Foo { private a = (1 as any) }
+class Foo { #a = (1 as any) }
       `,
       errors: [
         {
@@ -182,6 +188,12 @@ class Foo { private a = (1 as any) }
           column: 13,
           endColumn: 35,
         },
+        {
+          messageId: 'anyAssignment',
+          line: 7,
+          column: 13,
+          endColumn: 28,
+        },
       ],
     }),
     ...batchedSingleLineTests({
diff --git a/packages/shared-fixtures/fixtures/javascript/classes/class-private-field.src.js b/packages/shared-fixtures/fixtures/javascript/classes/class-private-field.src.js
new file mode 100644
index 00000000000..f8ae57c1677
--- /dev/null
+++ b/packages/shared-fixtures/fixtures/javascript/classes/class-private-field.src.js
@@ -0,0 +1,11 @@
+class Foo {
+  #bar
+
+  constructor(bar) {
+    this.#bar = name;
+  }
+
+  get bar () {
+    return this.#bar
+  }
+}
diff --git a/packages/shared-fixtures/fixtures/typescript/basics/class-private-field-modifiers-error.src.ts b/packages/shared-fixtures/fixtures/typescript/basics/class-private-field-modifiers-error.src.ts
new file mode 100644
index 00000000000..9db6e7dbc0c
--- /dev/null
+++ b/packages/shared-fixtures/fixtures/typescript/basics/class-private-field-modifiers-error.src.ts
@@ -0,0 +1,5 @@
+class Foo {
+  private #bar: string
+  public #bar: string
+  static #bar: string
+}
diff --git a/packages/shared-fixtures/fixtures/typescript/basics/class-private-field.src.ts b/packages/shared-fixtures/fixtures/typescript/basics/class-private-field.src.ts
new file mode 100644
index 00000000000..eff3032ed85
--- /dev/null
+++ b/packages/shared-fixtures/fixtures/typescript/basics/class-private-field.src.ts
@@ -0,0 +1,11 @@
+class Foo {
+  #bar: string
+
+  constructor(name: string) {
+    this.#bar = name;
+  }
+
+  get bar () {
+    return this.#bar
+  }
+}
diff --git a/packages/shared-fixtures/fixtures/typescript/basics/class-private-getter.src.ts b/packages/shared-fixtures/fixtures/typescript/basics/class-private-getter.src.ts
new file mode 100644
index 00000000000..8d62fd5a9fd
--- /dev/null
+++ b/packages/shared-fixtures/fixtures/typescript/basics/class-private-getter.src.ts
@@ -0,0 +1,3 @@
+class Foo {
+  get #foo() { }
+}
diff --git a/packages/shared-fixtures/fixtures/typescript/basics/class-private-method.src.ts b/packages/shared-fixtures/fixtures/typescript/basics/class-private-method.src.ts
new file mode 100644
index 00000000000..3c129787a4c
--- /dev/null
+++ b/packages/shared-fixtures/fixtures/typescript/basics/class-private-method.src.ts
@@ -0,0 +1,3 @@
+class Foo {
+  #foo() { }
+}
diff --git a/packages/shared-fixtures/fixtures/typescript/basics/class-readonly-private-field.src.ts b/packages/shared-fixtures/fixtures/typescript/basics/class-readonly-private-field.src.ts
new file mode 100644
index 00000000000..05410274190
--- /dev/null
+++ b/packages/shared-fixtures/fixtures/typescript/basics/class-readonly-private-field.src.ts
@@ -0,0 +1,3 @@
+class Foo {
+  readonly #bar: string
+}
diff --git a/packages/types/src/ast-node-types.ts b/packages/types/src/ast-node-types.ts
index 97c630d9472..55b1a835a28 100644
--- a/packages/types/src/ast-node-types.ts
+++ b/packages/types/src/ast-node-types.ts
@@ -61,6 +61,7 @@ enum AST_NODE_TYPES {
   NewExpression = 'NewExpression',
   ObjectExpression = 'ObjectExpression',
   ObjectPattern = 'ObjectPattern',
+  PrivateIdentifier = 'PrivateIdentifier',
   Program = 'Program',
   Property = 'Property',
   RestElement = 'RestElement',
diff --git a/packages/types/src/ts-estree.ts b/packages/types/src/ts-estree.ts
index 4dd89c962be..773e31d94b4 100644
--- a/packages/types/src/ts-estree.ts
+++ b/packages/types/src/ts-estree.ts
@@ -204,6 +204,7 @@ export type Node =
   | ObjectPattern
   | Program
   | Property
+  | PrivateIdentifier
   | RestElement
   | ReturnStatement
   | SequenceExpression
@@ -483,6 +484,7 @@ export type PropertyName = PropertyNameComputed | PropertyNameNonComputed;
 export type PropertyNameComputed = Expression;
 export type PropertyNameNonComputed =
   | Identifier
+  | PrivateIdentifier
   | StringLiteral
   | NumberLiteral;
 export type Statement =
@@ -654,7 +656,7 @@ interface LiteralBase extends BaseNode {
 /** this should not be directly used - instead use MemberExpressionComputedNameBase or MemberExpressionNonComputedNameBase */
 interface MemberExpressionBase extends BaseNode {
   object: LeftHandSideExpression;
-  property: Expression | Identifier;
+  property: Expression | Identifier | PrivateIdentifier;
   computed: boolean;
   optional: boolean;
 }
@@ -665,7 +667,7 @@ interface MemberExpressionComputedNameBase extends MemberExpressionBase {
 }
 
 interface MemberExpressionNonComputedNameBase extends MemberExpressionBase {
-  property: Identifier;
+  property: Identifier | PrivateIdentifier;
   computed: false;
 }
 
@@ -1174,6 +1176,11 @@ export interface Program extends BaseNode {
   tokens?: Token[];
 }
 
+export interface PrivateIdentifier extends BaseNode {
+  type: AST_NODE_TYPES.PrivateIdentifier;
+  name: string;
+}
+
 export interface PropertyComputedName extends PropertyBase {
   key: PropertyNameComputed;
   computed: true;
diff --git a/packages/typescript-estree/src/convert.ts b/packages/typescript-estree/src/convert.ts
index f8819a33c9e..916ddfb37b7 100644
--- a/packages/typescript-estree/src/convert.ts
+++ b/packages/typescript-estree/src/convert.ts
@@ -675,6 +675,12 @@ export class Converter {
         });
       }
 
+      case SyntaxKind.PrivateIdentifier:
+        return this.createNode<TSESTree.PrivateIdentifier>(node, {
+          type: AST_NODE_TYPES.PrivateIdentifier,
+          name: node.text.slice(1),
+        });
+
       case SyntaxKind.WithStatement:
         return this.createNode<TSESTree.WithStatement>(node, {
           type: AST_NODE_TYPES.WithStatement,
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 62053920280..01e6f0af469 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
@@ -118,6 +118,7 @@ export interface EstreeToTsNodeTypes {
   [AST_NODE_TYPES.ObjectPattern]:
     | ts.ObjectLiteralExpression
     | ts.ObjectBindingPattern;
+  [AST_NODE_TYPES.PrivateIdentifier]: ts.PrivateIdentifier;
   [AST_NODE_TYPES.Program]: ts.SourceFile;
   [AST_NODE_TYPES.Property]:
     | ts.PropertyAssignment
diff --git a/packages/typescript-estree/src/ts-estree/ts-nodes.ts b/packages/typescript-estree/src/ts-estree/ts-nodes.ts
index 80a7b34e0c8..846cdb6daf2 100644
--- a/packages/typescript-estree/src/ts-estree/ts-nodes.ts
+++ b/packages/typescript-estree/src/ts-estree/ts-nodes.ts
@@ -68,6 +68,7 @@ export type TSNode =
   | ts.OmittedExpression
   | ts.PartiallyEmittedExpression
   | ts.PrefixUnaryExpression
+  | ts.PrivateIdentifier
   | ts.PostfixUnaryExpression
   | ts.NullLiteral
   | ts.BooleanLiteral
diff --git a/packages/typescript-estree/tests/ast-alignment/fixtures-to-test.ts b/packages/typescript-estree/tests/ast-alignment/fixtures-to-test.ts
index 0515aa57f4d..f14ebb69d9f 100644
--- a/packages/typescript-estree/tests/ast-alignment/fixtures-to-test.ts
+++ b/packages/typescript-estree/tests/ast-alignment/fixtures-to-test.ts
@@ -390,6 +390,12 @@ tester.addFixturePatternConfig('typescript/basics', {
      * TODO: report this to babel
      */
     'catch-clause-with-invalid-annotation',
+    /**
+     * [BABEL ERRORED, BUT TS-ESTREE DID NOT]
+     * Private elements cannot have an accessibility modifier ('private')
+     * TODO: Add error code from typescript
+     */
+    'class-private-field-modifiers-error',
   ],
   ignoreSourceType: [
     /**
diff --git a/packages/typescript-estree/tests/ast-alignment/parse.ts b/packages/typescript-estree/tests/ast-alignment/parse.ts
index 46bef153a0f..98818568243 100644
--- a/packages/typescript-estree/tests/ast-alignment/parse.ts
+++ b/packages/typescript-estree/tests/ast-alignment/parse.ts
@@ -23,6 +23,8 @@ function parseWithBabelParser(text: string, jsx = true): any {
   const babel: typeof babelParser = require('@babel/parser');
   const plugins: ParserPlugin[] = [
     'classProperties',
+    'classPrivateProperties',
+    'classPrivateMethods',
     'decorators-legacy',
     'estree',
     'typescript',
diff --git a/packages/typescript-estree/tests/ast-alignment/utils.ts b/packages/typescript-estree/tests/ast-alignment/utils.ts
index a2c1d6f87f9..08a761e997f 100644
--- a/packages/typescript-estree/tests/ast-alignment/utils.ts
+++ b/packages/typescript-estree/tests/ast-alignment/utils.ts
@@ -241,6 +241,24 @@ export function preprocessBabylonAST(ast: BabelTypes.File): any {
           }
         }
       },
+      /**
+       * TS 3.8 private properties
+       * https://github.com/estree/estree/blob/master/experimental/class-features.md
+       */
+      ClassPrivateProperty(node) {
+        node.type = AST_NODE_TYPES.ClassProperty;
+        node.computed = false;
+        node.declare = false;
+      },
+      ClassPrivateMethod(node) {
+        node.type = AST_NODE_TYPES.MethodDefinition;
+        node.computed = false;
+      },
+      PrivateName(node) {
+        node.type = AST_NODE_TYPES.PrivateIdentifier;
+        node.name = (node.id as any).name;
+        delete node.id;
+      },
     },
   );
 }
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 63bba828ae0..734da49c3df 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
@@ -273,6 +273,8 @@ exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" e
 
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/javascript/classes/class-one-method-super.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
 
+exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/javascript/classes/class-private-field.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
+
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/javascript/classes/class-static-method.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
 
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/javascript/classes/class-static-method-named-prototype.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
@@ -1757,6 +1759,16 @@ exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" e
 
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/basics/class-multi-line-keyword-declare.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
 
+exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/basics/class-private-field.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
+
+exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/basics/class-private-field-modifiers-error.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
+
+exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/basics/class-private-getter.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
+
+exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/basics/class-private-method.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
+
+exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/basics/class-readonly-private-field.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
+
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/basics/class-with-accessibility-modifiers.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
 
 exports[`Parse all fixtures with "errorOnTypeScriptSyntacticAndSemanticIssues" enabled fixtures/typescript/basics/class-with-constructor-and-modifier.src 1`] = `"TEST OUTPUT: No semantic or syntactic issues found"`;
diff --git a/packages/typescript-estree/tests/snapshots/javascript/classes/class-private-field.src.js.shot b/packages/typescript-estree/tests/snapshots/javascript/classes/class-private-field.src.js.shot
new file mode 100644
index 00000000000..04ab3e2d6fd
--- /dev/null
+++ b/packages/typescript-estree/tests/snapshots/javascript/classes/class-private-field.src.js.shot
@@ -0,0 +1,963 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`javascript classes class-private-field.src 1`] = `
+Object {
+  "body": Array [
+    Object {
+      "body": Object {
+        "body": Array [
+          Object {
+            "computed": false,
+            "declare": false,
+            "key": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 6,
+                  "line": 2,
+                },
+                "start": Object {
+                  "column": 2,
+                  "line": 2,
+                },
+              },
+              "name": "bar",
+              "range": Array [
+                14,
+                18,
+              ],
+              "type": "PrivateIdentifier",
+            },
+            "loc": Object {
+              "end": Object {
+                "column": 6,
+                "line": 2,
+              },
+              "start": Object {
+                "column": 2,
+                "line": 2,
+              },
+            },
+            "range": Array [
+              14,
+              18,
+            ],
+            "readonly": undefined,
+            "static": false,
+            "type": "ClassProperty",
+            "value": null,
+          },
+          Object {
+            "computed": false,
+            "key": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 13,
+                  "line": 4,
+                },
+                "start": Object {
+                  "column": 2,
+                  "line": 4,
+                },
+              },
+              "name": "constructor",
+              "range": Array [
+                22,
+                33,
+              ],
+              "type": "Identifier",
+            },
+            "kind": "constructor",
+            "loc": Object {
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+      "type": "Punctuator",
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+    },
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+      "type": "Punctuator",
+      "value": "}",
+    },
+  ],
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+}
+`;
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-field-modifiers-error.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-field-modifiers-error.src.ts.shot
new file mode 100644
index 00000000000..0b5d6024b2f
--- /dev/null
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-field-modifiers-error.src.ts.shot
@@ -0,0 +1,594 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`typescript basics class-private-field-modifiers-error.src 1`] = `
+Object {
+  "body": Array [
+    Object {
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+                },
+              },
+              "name": "bar",
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+              "type": "PrivateIdentifier",
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+            "static": false,
+            "type": "ClassProperty",
+            "typeAnnotation": Object {
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+              "range": Array [
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+              "type": "TSTypeAnnotation",
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+                "type": "TSStringKeyword",
+              },
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+            "value": null,
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+            "declare": false,
+            "key": Object {
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+            },
+            "range": Array [
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+            "readonly": undefined,
+            "static": false,
+            "type": "ClassProperty",
+            "typeAnnotation": Object {
+              "loc": Object {
+                "end": Object {
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+                  "line": 3,
+                },
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+                  "line": 3,
+                },
+              },
+              "range": Array [
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+                56,
+              ],
+              "type": "TSTypeAnnotation",
+              "typeAnnotation": Object {
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+                "type": "TSStringKeyword",
+              },
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+            "value": null,
+          },
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+            "line": 1,
+          },
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+          },
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+        ],
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+      },
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+      "value": "{",
+    },
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+          "line": 2,
+        },
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+        },
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+    },
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+      "value": "string",
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+        },
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+      "range": Array [
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+      "type": "Punctuator",
+      "value": "}",
+    },
+  ],
+  "type": "Program",
+}
+`;
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-field.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-field.src.ts.shot
new file mode 100644
index 00000000000..4cb9b2459d7
--- /dev/null
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-field.src.ts.shot
@@ -0,0 +1,1103 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`typescript basics class-private-field.src 1`] = `
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+    Object {
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+                },
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+              "name": "bar",
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+              "type": "PrivateIdentifier",
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+            "loc": Object {
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+                          },
+                        },
+                        "object": Object {
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+                        "optional": false,
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+                              "line": 5,
+                            },
+                          },
+                          "name": "bar",
+                          "range": Array [
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+                            71,
+                          ],
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+                        },
+                        "range": Array [
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+                        "type": "MemberExpression",
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+                          "line": 5,
+                        },
+                        "start": Object {
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+                        },
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+                      "operator": "=",
+                      "range": Array [
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+                      "right": Object {
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+                          },
+                        },
+                        "name": "name",
+                        "range": Array [
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+                        "type": "Identifier",
+                      },
+                      "type": "AssignmentExpression",
+                    },
+                    "loc": Object {
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+                      },
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+                    "range": Array [
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+                    "type": "ExpressionStatement",
+                  },
+                ],
+                "loc": Object {
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+                    "line": 6,
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+                  },
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+                "range": Array [
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+                "type": "BlockStatement",
+              },
+              "expression": false,
+              "generator": false,
+              "id": null,
+              "loc": Object {
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+                  "line": 6,
+                },
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+                  "line": 4,
+                },
+              },
+              "params": Array [
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+                      "line": 4,
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+                  "type": "Identifier",
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+                    "typeAnnotation": Object {
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+                },
+              },
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+              "range": Array [
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+              ],
+              "type": "Identifier",
+            },
+            "kind": "get",
+            "loc": Object {
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+                "line": 10,
+              },
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+                "line": 8,
+              },
+            },
+            "range": Array [
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+              124,
+            ],
+            "static": false,
+            "type": "MethodDefinition",
+            "value": Object {
+              "async": false,
+              "body": Object {
+                "body": Array [
+                  Object {
+                    "argument": Object {
+                      "computed": false,
+                      "loc": Object {
+                        "end": Object {
+                          "column": 20,
+                          "line": 9,
+                        },
+                        "start": Object {
+                          "column": 11,
+                          "line": 9,
+                        },
+                      },
+                      "object": Object {
+                        "loc": Object {
+                          "end": Object {
+                            "column": 15,
+                            "line": 9,
+                          },
+                          "start": Object {
+                            "column": 11,
+                            "line": 9,
+                          },
+                        },
+                        "range": Array [
+                          111,
+                          115,
+                        ],
+                        "type": "ThisExpression",
+                      },
+                      "optional": false,
+                      "property": Object {
+                        "loc": Object {
+                          "end": Object {
+                            "column": 20,
+                            "line": 9,
+                          },
+                          "start": Object {
+                            "column": 16,
+                            "line": 9,
+                          },
+                        },
+                        "name": "bar",
+                        "range": Array [
+                          116,
+                          120,
+                        ],
+                        "type": "PrivateIdentifier",
+                      },
+                      "range": Array [
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+                      ],
+                      "type": "MemberExpression",
+                    },
+                    "loc": Object {
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+                        "line": 9,
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+                    ],
+                    "type": "ReturnStatement",
+                  },
+                ],
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+                  },
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+              },
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+                },
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+              "params": Array [],
+              "range": Array [
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+              ],
+              "type": "FunctionExpression",
+            },
+          },
+        ],
+        "loc": Object {
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+      },
+      "id": Object {
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+          },
+          "start": Object {
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+            "line": 1,
+          },
+        },
+        "name": "Foo",
+        "range": Array [
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+          9,
+        ],
+        "type": "Identifier",
+      },
+      "loc": Object {
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+        },
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+        },
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+      "superClass": null,
+      "type": "ClassDeclaration",
+    },
+  ],
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+  "loc": Object {
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+      "line": 12,
+    },
+    "start": Object {
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+      "line": 1,
+    },
+  },
+  "range": Array [
+    0,
+    127,
+  ],
+  "sourceType": "script",
+  "tokens": Array [
+    Object {
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+        },
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+          "line": 1,
+        },
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+      "type": "Keyword",
+      "value": "class",
+    },
+    Object {
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+        },
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+        },
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+      "range": Array [
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+      ],
+      "type": "Identifier",
+      "value": "Foo",
+    },
+    Object {
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+          "line": 1,
+        },
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+  "type": "Program",
+}
+`;
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-getter.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-getter.src.ts.shot
new file mode 100644
index 00000000000..2e634b304b5
--- /dev/null
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-getter.src.ts.shot
@@ -0,0 +1,340 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`typescript basics class-private-getter.src 1`] = `
+Object {
+  "body": Array [
+    Object {
+      "body": Object {
+        "body": Array [
+          Object {
+            "computed": false,
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+                },
+              },
+              "name": "foo",
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+            "kind": "get",
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+      "type": "Identifier",
+      "value": "Foo",
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+    Object {
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+      "value": "get",
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+    Object {
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+        },
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+        },
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+      ],
+      "type": "Identifier",
+      "value": "#foo",
+    },
+    Object {
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+      "type": "Punctuator",
+      "value": "(",
+    },
+    Object {
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+        },
+        "start": Object {
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+          "line": 2,
+        },
+      },
+      "range": Array [
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+        24,
+      ],
+      "type": "Punctuator",
+      "value": ")",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 14,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 13,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        25,
+        26,
+      ],
+      "type": "Punctuator",
+      "value": "{",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 16,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 15,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        27,
+        28,
+      ],
+      "type": "Punctuator",
+      "value": "}",
+    },
+    Object {
+      "loc": Object {
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+          "column": 1,
+          "line": 3,
+        },
+        "start": Object {
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+        },
+      },
+      "range": Array [
+        29,
+        30,
+      ],
+      "type": "Punctuator",
+      "value": "}",
+    },
+  ],
+  "type": "Program",
+}
+`;
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-method.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-method.src.ts.shot
new file mode 100644
index 00000000000..dfbf991fd83
--- /dev/null
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/class-private-method.src.ts.shot
@@ -0,0 +1,322 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`typescript basics class-private-method.src 1`] = `
+Object {
+  "body": Array [
+    Object {
+      "body": Object {
+        "body": Array [
+          Object {
+            "computed": false,
+            "key": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 6,
+                  "line": 2,
+                },
+                "start": Object {
+                  "column": 2,
+                  "line": 2,
+                },
+              },
+              "name": "foo",
+              "range": Array [
+                14,
+                18,
+              ],
+              "type": "PrivateIdentifier",
+            },
+            "kind": "method",
+            "loc": Object {
+              "end": Object {
+                "column": 12,
+                "line": 2,
+              },
+              "start": Object {
+                "column": 2,
+                "line": 2,
+              },
+            },
+            "range": Array [
+              14,
+              24,
+            ],
+            "static": false,
+            "type": "MethodDefinition",
+            "value": Object {
+              "async": false,
+              "body": Object {
+                "body": Array [],
+                "loc": Object {
+                  "end": Object {
+                    "column": 12,
+                    "line": 2,
+                  },
+                  "start": Object {
+                    "column": 9,
+                    "line": 2,
+                  },
+                },
+                "range": Array [
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+                  24,
+                ],
+                "type": "BlockStatement",
+              },
+              "expression": false,
+              "generator": false,
+              "id": null,
+              "loc": Object {
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+                  "line": 2,
+                },
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+                  "line": 2,
+                },
+              },
+              "params": Array [],
+              "range": Array [
+                18,
+                24,
+              ],
+              "type": "FunctionExpression",
+            },
+          },
+        ],
+        "loc": Object {
+          "end": Object {
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+            "line": 3,
+          },
+          "start": Object {
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+        ],
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+      },
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+          },
+        },
+        "name": "Foo",
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+          6,
+          9,
+        ],
+        "type": "Identifier",
+      },
+      "loc": Object {
+        "end": Object {
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+        },
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+      "type": "ClassDeclaration",
+    },
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+  "comments": Array [],
+  "loc": Object {
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+      "type": "Keyword",
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+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 9,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 6,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        6,
+        9,
+      ],
+      "type": "Identifier",
+      "value": "Foo",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 11,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 10,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        10,
+        11,
+      ],
+      "type": "Punctuator",
+      "value": "{",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 6,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 2,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        14,
+        18,
+      ],
+      "type": "Identifier",
+      "value": "#foo",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 7,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 6,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        18,
+        19,
+      ],
+      "type": "Punctuator",
+      "value": "(",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 8,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 7,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        19,
+        20,
+      ],
+      "type": "Punctuator",
+      "value": ")",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 10,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 9,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        21,
+        22,
+      ],
+      "type": "Punctuator",
+      "value": "{",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 12,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 11,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        23,
+        24,
+      ],
+      "type": "Punctuator",
+      "value": "}",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 1,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        25,
+        26,
+      ],
+      "type": "Punctuator",
+      "value": "}",
+    },
+  ],
+  "type": "Program",
+}
+`;
diff --git a/packages/typescript-estree/tests/snapshots/typescript/basics/class-readonly-private-field.src.ts.shot b/packages/typescript-estree/tests/snapshots/typescript/basics/class-readonly-private-field.src.ts.shot
new file mode 100644
index 00000000000..78e08945f9d
--- /dev/null
+++ b/packages/typescript-estree/tests/snapshots/typescript/basics/class-readonly-private-field.src.ts.shot
@@ -0,0 +1,300 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`typescript basics class-readonly-private-field.src 1`] = `
+Object {
+  "body": Array [
+    Object {
+      "body": Object {
+        "body": Array [
+          Object {
+            "computed": false,
+            "declare": false,
+            "key": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 15,
+                  "line": 2,
+                },
+                "start": Object {
+                  "column": 11,
+                  "line": 2,
+                },
+              },
+              "name": "bar",
+              "range": Array [
+                23,
+                27,
+              ],
+              "type": "PrivateIdentifier",
+            },
+            "loc": Object {
+              "end": Object {
+                "column": 23,
+                "line": 2,
+              },
+              "start": Object {
+                "column": 2,
+                "line": 2,
+              },
+            },
+            "range": Array [
+              14,
+              35,
+            ],
+            "readonly": true,
+            "static": false,
+            "type": "ClassProperty",
+            "typeAnnotation": Object {
+              "loc": Object {
+                "end": Object {
+                  "column": 23,
+                  "line": 2,
+                },
+                "start": Object {
+                  "column": 15,
+                  "line": 2,
+                },
+              },
+              "range": Array [
+                27,
+                35,
+              ],
+              "type": "TSTypeAnnotation",
+              "typeAnnotation": Object {
+                "loc": Object {
+                  "end": Object {
+                    "column": 23,
+                    "line": 2,
+                  },
+                  "start": Object {
+                    "column": 17,
+                    "line": 2,
+                  },
+                },
+                "range": Array [
+                  29,
+                  35,
+                ],
+                "type": "TSStringKeyword",
+              },
+            },
+            "value": null,
+          },
+        ],
+        "loc": Object {
+          "end": Object {
+            "column": 1,
+            "line": 3,
+          },
+          "start": Object {
+            "column": 10,
+            "line": 1,
+          },
+        },
+        "range": Array [
+          10,
+          37,
+        ],
+        "type": "ClassBody",
+      },
+      "id": Object {
+        "loc": Object {
+          "end": Object {
+            "column": 9,
+            "line": 1,
+          },
+          "start": Object {
+            "column": 6,
+            "line": 1,
+          },
+        },
+        "name": "Foo",
+        "range": Array [
+          6,
+          9,
+        ],
+        "type": "Identifier",
+      },
+      "loc": Object {
+        "end": Object {
+          "column": 1,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        0,
+        37,
+      ],
+      "superClass": null,
+      "type": "ClassDeclaration",
+    },
+  ],
+  "comments": Array [],
+  "loc": Object {
+    "end": Object {
+      "column": 0,
+      "line": 4,
+    },
+    "start": Object {
+      "column": 0,
+      "line": 1,
+    },
+  },
+  "range": Array [
+    0,
+    38,
+  ],
+  "sourceType": "script",
+  "tokens": Array [
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 5,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        0,
+        5,
+      ],
+      "type": "Keyword",
+      "value": "class",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 9,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 6,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        6,
+        9,
+      ],
+      "type": "Identifier",
+      "value": "Foo",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 11,
+          "line": 1,
+        },
+        "start": Object {
+          "column": 10,
+          "line": 1,
+        },
+      },
+      "range": Array [
+        10,
+        11,
+      ],
+      "type": "Punctuator",
+      "value": "{",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 10,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 2,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        14,
+        22,
+      ],
+      "type": "Identifier",
+      "value": "readonly",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 15,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 11,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        23,
+        27,
+      ],
+      "type": "Identifier",
+      "value": "#bar",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 16,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 15,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        27,
+        28,
+      ],
+      "type": "Punctuator",
+      "value": ":",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 23,
+          "line": 2,
+        },
+        "start": Object {
+          "column": 17,
+          "line": 2,
+        },
+      },
+      "range": Array [
+        29,
+        35,
+      ],
+      "type": "Identifier",
+      "value": "string",
+    },
+    Object {
+      "loc": Object {
+        "end": Object {
+          "column": 1,
+          "line": 3,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 3,
+        },
+      },
+      "range": Array [
+        36,
+        37,
+      ],
+      "type": "Punctuator",
+      "value": "}",
+    },
+  ],
+  "type": "Program",
+}
+`;
diff --git a/packages/visitor-keys/src/visitor-keys.ts b/packages/visitor-keys/src/visitor-keys.ts
index 68c6b806bcc..32d21ed812f 100644
--- a/packages/visitor-keys/src/visitor-keys.ts
+++ b/packages/visitor-keys/src/visitor-keys.ts
@@ -45,6 +45,7 @@ const additionalKeys: AdditionalKeys = {
   FunctionDeclaration: ['id', 'typeParameters', 'params', 'returnType', 'body'],
   FunctionExpression: ['id', 'typeParameters', 'params', 'returnType', 'body'],
   Identifier: ['decorators', 'typeAnnotation'],
+  PrivateIdentifier: [],
   MethodDefinition: ['decorators', 'key', 'value'],
   NewExpression: ['callee', 'typeParameters', 'arguments'],
   ObjectPattern: ['decorators', 'properties', 'typeAnnotation'],