diff --git a/packages/babel-parser/src/plugins/typescript/index.ts b/packages/babel-parser/src/plugins/typescript/index.ts
--- a/packages/babel-parser/src/plugins/typescript/index.ts
+++ b/packages/babel-parser/src/plugins/typescript/index.ts
@@ -214,6 +214,8 @@ const TSErrors = ParseErrorEnum`typescript`({
     `Single type parameter ${typeParameterName} should have a trailing comma. Example usage: <${typeParameterName},>.`,
   StaticBlockCannotHaveModifier:
     "Static class blocks cannot have any modifier.",
+  TupleOptionalAfterType:
+    "A labeled tuple optional element must be declared using a question mark after the name and before the colon (`name?: type`), rather than after the type (`name: type?`).",
   TypeAnnotationAfterAssign:
     "Type annotations must come before default assignments, e.g. instead of `age = 25: number` use `age: number = 25`.",
   TypeImportCannotSpecifyDefaultAndNamed:
@@ -460,8 +462,6 @@ export default (superClass: ClassWithMixin<typeof Parser, IJSXParserMixin>) =>
         case "TypeParametersOrArguments":
           return this.match(tt.gt);
       }
-
-      throw new Error("Unreachable");
     }
 
     tsParseList<T extends N.Node>(
@@ -1099,34 +1099,78 @@ export default (superClass: ClassWithMixin<typeof Parser, IJSXParserMixin>) =>
       return this.finishNode(node, "TSTupleType");
     }
 
-    tsParseTupleElementType(): N.TsType | N.TsNamedTupleMember {
+    tsParseTupleElementType(): N.TsNamedTupleMember | N.TsType {
       // parses `...TsType[]`
 
       const { startLoc } = this.state;
 
       const rest = this.eat(tt.ellipsis);
-      let type: N.TsType | N.TsNamedTupleMember = this.tsParseType();
-      const optional = this.eat(tt.question);
-      const labeled = this.eat(tt.colon);
 
-      if (labeled) {
-        const labeledNode = this.startNodeAtNode<N.TsNamedTupleMember>(type);
-        labeledNode.optional = optional;
+      let labeled: boolean;
+      let label: N.Identifier;
+      let optional: boolean;
+      let type: N.TsNamedTupleMember | N.TsType;
+
+      const isWord = tokenIsKeywordOrIdentifier(this.state.type);
+      const chAfterWord = isWord ? this.lookaheadCharCode() : null;
+      if (chAfterWord === charCodes.colon) {
+        labeled = true;
+        optional = false;
+        label = this.parseIdentifier(true);
+        this.expect(tt.colon);
+        type = this.tsParseType();
+      } else if (chAfterWord === charCodes.questionMark) {
+        optional = true;
+        const startLoc = this.state.startLoc;
+        const wordName = this.state.value;
+        const typeOrLabel = this.tsParseNonArrayType();
+
+        if (this.lookaheadCharCode() === charCodes.colon) {
+          labeled = true;
+          label = this.createIdentifier(
+            this.startNodeAt<N.Identifier>(startLoc),
+            wordName,
+          );
+          this.expect(tt.question);
+          this.expect(tt.colon);
+          type = this.tsParseType();
+        } else {
+          labeled = false;
+          type = typeOrLabel;
+          this.expect(tt.question);
+        }
+      } else {
+        type = this.tsParseType();
+        optional = this.eat(tt.question);
+        // In this case (labeled === true) could be only in invalid label.
+        // E.g. [x.y:type]
+        // An error is raised while processing node.
+        labeled = this.eat(tt.colon);
+      }
 
-        if (
-          type.type === "TSTypeReference" &&
-          !type.typeParameters &&
-          type.typeName.type === "Identifier"
-        ) {
-          labeledNode.label = type.typeName;
+      if (labeled) {
+        let labeledNode: Undone<N.TsNamedTupleMember>;
+        if (label) {
+          labeledNode = this.startNodeAtNode<N.TsNamedTupleMember>(label);
+          labeledNode.optional = optional;
+          labeledNode.label = label;
+          labeledNode.elementType = type;
+
+          if (this.eat(tt.question)) {
+            labeledNode.optional = true;
+            this.raise(TSErrors.TupleOptionalAfterType, {
+              at: this.state.lastTokStartLoc,
+            });
+          }
         } else {
+          labeledNode = this.startNodeAtNode<N.TsNamedTupleMember>(type);
+          labeledNode.optional = optional;
           this.raise(TSErrors.InvalidTupleMemberLabel, { at: type });
           // @ts-expect-error This produces an invalid AST, but at least we don't drop
           // nodes representing the invalid source.
           labeledNode.label = type;
+          labeledNode.elementType = this.tsParseType();
         }
-
-        labeledNode.elementType = this.tsParseType();
         type = this.finishNode(labeledNode, "TSNamedTupleMember");
       } else if (optional) {
         const optionalTypeNode = this.startNodeAtNode<N.TsOptionalType>(type);

diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled-babel-7/input.ts b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled-babel-7/input.ts
new file mode 100644
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled-babel-7/input.ts
@@ -0,0 +1,5 @@
+type FuncWithDescriptionBabel7 = [
+  function: (...args: any[]) => any,
+  string: string,
+  void?: number
+]
diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled-babel-7/options.json b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled-babel-7/options.json
new file mode 100644
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled-babel-7/options.json
@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": false
+}
diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled-babel-7/output.json b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled-babel-7/output.json
new file mode 100644
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled-babel-7/output.json
@@ -0,0 +1,101 @@
+{
+  "type": "File",
+  "start":0,"end":107,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":5,"column":1,"index":107}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":107,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":5,"column":1,"index":107}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSTypeAliasDeclaration",
+        "start":0,"end":107,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":5,"column":1,"index":107}},
+        "id": {
+          "type": "Identifier",
+          "start":5,"end":30,"loc":{"start":{"line":1,"column":5,"index":5},"end":{"line":1,"column":30,"index":30},"identifierName":"FuncWithDescriptionBabel7"},
+          "name": "FuncWithDescriptionBabel7"
+        },
+        "typeAnnotation": {
+          "type": "TSTupleType",
+          "start":33,"end":107,"loc":{"start":{"line":1,"column":33,"index":33},"end":{"line":5,"column":1,"index":107}},
+          "elementTypes": [
+            {
+              "type": "TSNamedTupleMember",
+              "start":37,"end":70,"loc":{"start":{"line":2,"column":2,"index":37},"end":{"line":2,"column":35,"index":70}},
+              "optional": false,
+              "label": {
+                "type": "Identifier",
+                "start":37,"end":45,"loc":{"start":{"line":2,"column":2,"index":37},"end":{"line":2,"column":10,"index":45},"identifierName":"function"},
+                "name": "function"
+              },
+              "elementType": {
+                "type": "TSFunctionType",
+                "start":47,"end":70,"loc":{"start":{"line":2,"column":12,"index":47},"end":{"line":2,"column":35,"index":70}},
+                "parameters": [
+                  {
+                    "type": "RestElement",
+                    "start":48,"end":62,"loc":{"start":{"line":2,"column":13,"index":48},"end":{"line":2,"column":27,"index":62}},
+                    "argument": {
+                      "type": "Identifier",
+                      "start":51,"end":55,"loc":{"start":{"line":2,"column":16,"index":51},"end":{"line":2,"column":20,"index":55},"identifierName":"args"},
+                      "name": "args"
+                    },
+                    "typeAnnotation": {
+                      "type": "TSTypeAnnotation",
+                      "start":55,"end":62,"loc":{"start":{"line":2,"column":20,"index":55},"end":{"line":2,"column":27,"index":62}},
+                      "typeAnnotation": {
+                        "type": "TSArrayType",
+                        "start":57,"end":62,"loc":{"start":{"line":2,"column":22,"index":57},"end":{"line":2,"column":27,"index":62}},
+                        "elementType": {
+                          "type": "TSAnyKeyword",
+                          "start":57,"end":60,"loc":{"start":{"line":2,"column":22,"index":57},"end":{"line":2,"column":25,"index":60}}
+                        }
+                      }
+                    }
+                  }
+                ],
+                "typeAnnotation": {
+                  "type": "TSTypeAnnotation",
+                  "start":64,"end":70,"loc":{"start":{"line":2,"column":29,"index":64},"end":{"line":2,"column":35,"index":70}},
+                  "typeAnnotation": {
+                    "type": "TSAnyKeyword",
+                    "start":67,"end":70,"loc":{"start":{"line":2,"column":32,"index":67},"end":{"line":2,"column":35,"index":70}}
+                  }
+                }
+              }
+            },
+            {
+              "type": "TSNamedTupleMember",
+              "start":74,"end":88,"loc":{"start":{"line":3,"column":2,"index":74},"end":{"line":3,"column":16,"index":88}},
+              "optional": false,
+              "label": {
+                "type": "Identifier",
+                "start":74,"end":80,"loc":{"start":{"line":3,"column":2,"index":74},"end":{"line":3,"column":8,"index":80},"identifierName":"string"},
+                "name": "string"
+              },
+              "elementType": {
+                "type": "TSStringKeyword",
+                "start":82,"end":88,"loc":{"start":{"line":3,"column":10,"index":82},"end":{"line":3,"column":16,"index":88}}
+              }
+            },
+            {
+              "type": "TSNamedTupleMember",
+              "start":92,"end":105,"loc":{"start":{"line":4,"column":2,"index":92},"end":{"line":4,"column":15,"index":105}},
+              "optional": true,
+              "label": {
+                "type": "Identifier",
+                "start":92,"end":96,"loc":{"start":{"line":4,"column":2,"index":92},"end":{"line":4,"column":6,"index":96},"identifierName":"void"},
+                "name": "void"
+              },
+              "elementType": {
+                "type": "TSNumberKeyword",
+                "start":99,"end":105,"loc":{"start":{"line":4,"column":9,"index":99},"end":{"line":4,"column":15,"index":105}}
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}
diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled/input.ts b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled/input.ts
new file mode 100644
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled/input.ts
@@ -0,0 +1,5 @@
+type FuncWithDescription = [
+  function: (...args: any[]) => any,
+  string: string,
+  void?: number
+]
diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled/options.json b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled/options.json
new file mode 100644
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled/options.json
@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}
diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled/output.json b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled/output.json
new file mode 100644
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-keyword-labeled/output.json
@@ -0,0 +1,101 @@
+{
+  "type": "File",
+  "start":0,"end":101,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":5,"column":1,"index":101}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":101,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":5,"column":1,"index":101}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSTypeAliasDeclaration",
+        "start":0,"end":101,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":5,"column":1,"index":101}},
+        "id": {
+          "type": "Identifier",
+          "start":5,"end":24,"loc":{"start":{"line":1,"column":5,"index":5},"end":{"line":1,"column":24,"index":24},"identifierName":"FuncWithDescription"},
+          "name": "FuncWithDescription"
+        },
+        "typeAnnotation": {
+          "type": "TSTupleType",
+          "start":27,"end":101,"loc":{"start":{"line":1,"column":27,"index":27},"end":{"line":5,"column":1,"index":101}},
+          "elementTypes": [
+            {
+              "type": "TSNamedTupleMember",
+              "start":31,"end":64,"loc":{"start":{"line":2,"column":2,"index":31},"end":{"line":2,"column":35,"index":64}},
+              "optional": false,
+              "label": {
+                "type": "Identifier",
+                "start":31,"end":39,"loc":{"start":{"line":2,"column":2,"index":31},"end":{"line":2,"column":10,"index":39},"identifierName":"function"},
+                "name": "function"
+              },
+              "elementType": {
+                "type": "TSFunctionType",
+                "start":41,"end":64,"loc":{"start":{"line":2,"column":12,"index":41},"end":{"line":2,"column":35,"index":64}},
+                "params": [
+                  {
+                    "type": "RestElement",
+                    "start":42,"end":56,"loc":{"start":{"line":2,"column":13,"index":42},"end":{"line":2,"column":27,"index":56}},
+                    "argument": {
+                      "type": "Identifier",
+                      "start":45,"end":49,"loc":{"start":{"line":2,"column":16,"index":45},"end":{"line":2,"column":20,"index":49},"identifierName":"args"},
+                      "name": "args"
+                    },
+                    "typeAnnotation": {
+                      "type": "TSTypeAnnotation",
+                      "start":49,"end":56,"loc":{"start":{"line":2,"column":20,"index":49},"end":{"line":2,"column":27,"index":56}},
+                      "typeAnnotation": {
+                        "type": "TSArrayType",
+                        "start":51,"end":56,"loc":{"start":{"line":2,"column":22,"index":51},"end":{"line":2,"column":27,"index":56}},
+                        "elementType": {
+                          "type": "TSAnyKeyword",
+                          "start":51,"end":54,"loc":{"start":{"line":2,"column":22,"index":51},"end":{"line":2,"column":25,"index":54}}
+                        }
+                      }
+                    }
+                  }
+                ],
+                "returnType": {
+                  "type": "TSTypeAnnotation",
+                  "start":58,"end":64,"loc":{"start":{"line":2,"column":29,"index":58},"end":{"line":2,"column":35,"index":64}},
+                  "typeAnnotation": {
+                    "type": "TSAnyKeyword",
+                    "start":61,"end":64,"loc":{"start":{"line":2,"column":32,"index":61},"end":{"line":2,"column":35,"index":64}}
+                  }
+                }
+              }
+            },
+            {
+              "type": "TSNamedTupleMember",
+              "start":68,"end":82,"loc":{"start":{"line":3,"column":2,"index":68},"end":{"line":3,"column":16,"index":82}},
+              "optional": false,
+              "label": {
+                "type": "Identifier",
+                "start":68,"end":74,"loc":{"start":{"line":3,"column":2,"index":68},"end":{"line":3,"column":8,"index":74},"identifierName":"string"},
+                "name": "string"
+              },
+              "elementType": {
+                "type": "TSStringKeyword",
+                "start":76,"end":82,"loc":{"start":{"line":3,"column":10,"index":76},"end":{"line":3,"column":16,"index":82}}
+              }
+            },
+            {
+              "type": "TSNamedTupleMember",
+              "start":86,"end":99,"loc":{"start":{"line":4,"column":2,"index":86},"end":{"line":4,"column":15,"index":99}},
+              "optional": true,
+              "label": {
+                "type": "Identifier",
+                "start":86,"end":90,"loc":{"start":{"line":4,"column":2,"index":86},"end":{"line":4,"column":6,"index":90},"identifierName":"void"},
+                "name": "void"
+              },
+              "elementType": {
+                "type": "TSNumberKeyword",
+                "start":93,"end":99,"loc":{"start":{"line":4,"column":9,"index":93},"end":{"line":4,"column":15,"index":99}}
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}
diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-labeled-invalid-optional/options.json b/packages/babel-parser/test/fixtures/typescript/types/tuple-labeled-invalid-optional/options.json
--- a/packages/babel-parser/test/fixtures/typescript/types/tuple-labeled-invalid-optional/options.json
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-labeled-invalid-optional/options.json
@@ -2,6 +2,5 @@
   "sourceType": "module",
   "plugins": [
     "typescript"
-  ],
-  "throws": "Unexpected token, expected \",\" (1:14)"
-}
\ No newline at end of file
+  ]
+}
diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-labeled-invalid-optional/output.json b/packages/babel-parser/test/fixtures/typescript/types/tuple-labeled-invalid-optional/output.json
new file mode 100644
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-labeled-invalid-optional/output.json
@@ -0,0 +1,50 @@
+{
+  "type": "File",
+  "start":0,"end":17,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":1,"column":17,"index":17}},
+  "errors": [
+    "SyntaxError: A labeled tuple optional element must be declared using a question mark after the name and before the colon (`name?: type`), rather than after the type (`name: type?`). (1:14)"
+  ],
+  "program": {
+    "type": "Program",
+    "start":0,"end":17,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":1,"column":17,"index":17}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "TSTypeAliasDeclaration",
+        "start":0,"end":17,"loc":{"start":{"line":1,"column":0,"index":0},"end":{"line":1,"column":17,"index":17}},
+        "id": {
+          "type": "Identifier",
+          "start":5,"end":6,"loc":{"start":{"line":1,"column":5,"index":5},"end":{"line":1,"column":6,"index":6},"identifierName":"T"},
+          "name": "T"
+        },
+        "typeAnnotation": {
+          "type": "TSTupleType",
+          "start":9,"end":16,"loc":{"start":{"line":1,"column":9,"index":9},"end":{"line":1,"column":16,"index":16}},
+          "elementTypes": [
+            {
+              "type": "TSNamedTupleMember",
+              "start":10,"end":15,"loc":{"start":{"line":1,"column":10,"index":10},"end":{"line":1,"column":15,"index":15}},
+              "optional": true,
+              "label": {
+                "type": "Identifier",
+                "start":10,"end":11,"loc":{"start":{"line":1,"column":10,"index":10},"end":{"line":1,"column":11,"index":11},"identifierName":"x"},
+                "name": "x"
+              },
+              "elementType": {
+                "type": "TSTypeReference",
+                "start":13,"end":14,"loc":{"start":{"line":1,"column":13,"index":13},"end":{"line":1,"column":14,"index":14}},
+                "typeName": {
+                  "type": "Identifier",
+                  "start":13,"end":14,"loc":{"start":{"line":1,"column":13,"index":13},"end":{"line":1,"column":14,"index":14},"identifierName":"A"},
+                  "name": "A"
+                }
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

[Bug]: Typescript plugin fails on named tuple positions where the name is a reserved word in JS
### 💻

- [ ] Would you like to work on a fix?

### How are you using Babel?

babel-loader (webpack)

### Input code

```
type FuncWithDescription = [
  function: (...args: any[]) => any,
  string: string
]
```

https://babeljs.io/repl#?browsers=defaults&build=&builtIns=false&corejs=3.6&spec=false&loose=false&code_lz=C4TwDgpgBAYgrgOwMYHUCWwAWARCBnJAJzTGDQHsEoBeKAbQCgooAzRJMygLigAoA6QQENCAczw8hCEHQC6AShoA-KFJAAaJlDzBiCUTx17RDWQwZJKO1gnRZcBYqQoIJsdnZz4iJTgjk09FrMdLwAHlwIcAC2AEYQhIrUKmHqUABEhBDAcIRUWNBRcQnpsprMIeGRMfGEaSDVxYnKUGEAVBoZ0XAANmRgPSBQBVBFtXilpkA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env%2Creact%2Cstage-2%2Ctypescript&prettier=false&targets=&version=7.15.3&externalPlugins=&assumptions=%7B%7D

### Configuration file name

_No response_

### Configuration

See REPL link

### Current and expected behavior

#### Current
It throws at line 2: `/repl.tsx: Unexpected token (2:2)`
If you rename `function` to `fn`, then
it throws at line 3: `Tuple members must be labeled with a simple identifier. (3:2)`

#### Expected
It does not throw an error on either line. Why would I expect this? Because TS is totally fine with this same code: https://www.typescriptlang.org/play?ts=4.0.2#code/C4TwDgpgBAYgrgOwMYHUCWwAWARCBnJAJzTGDQHsEoBeKAbQFgAoKVqAM0STMoC4oAFADoRAQ0IBzPP1EIQdALoBKagD4oskABpmbKHmDEEE-gaMTmC5sySUDHBOiy4CxUhQTTYXJznxESHgRFGnpdNjoBAA9eBDgAWwAjCEIlGnUorSgAIkIIYDhCKixoOKSU7IUdFgjo2ITkwiyQevLU9KgogCptHPi4ABsyMAGQKBKoMsa8SssgA

### Environment

See REPL link for env details

### Possible solution

There are two ways to fix this problem, in my opinion

#### Option 1: Updated docs, and better error messages

Indicate in the docs (just like with [other caveats](https://babeljs.io/docs/en/babel-plugin-transform-typescript#caveats)) that there are certain tokens that are not acceptable for named tuple positions.

Then, ensure that the errors thrown in my example above clearly state this problem and/or reference the newly updated docs. I think the second error (`Tuple members must be labeled with a simple identifier.`) is possibly acknowledging this discrepancy, but it is not clear to me that the error is a known caveat vs an actual TS syntax issue. (The first error thrown against the word `function`, though, is quite vague.)

#### Option 2: Update the TypeScript plugin to handle these names

I do not know how many words fail in the Babel plugin, and yet succeed in TS. I do know that the following are in the list:

- `function`
- `string`
- `number`

### Additional context

_No response_
Named Tuple label : reserved keywords
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| Q                        | A <!--(Can use an emoji 👍) -->
| ------------------------ | ---
| Fixed Issues?            | Fixes #13702 <!-- remove the (`) quotes and write "Fixes" before the number to link the issues -->
| Patch: Bug Fix?          | 👍 
| Major: Breaking Change?  | -
| Minor: New Feature?      | -
| Tests Added + Pass?      | 👍 
| Documentation PR Link    |  - <!-- If only readme change, add `[skip ci]` to your commits -->
| Any Dependency Changes?  | -
| License                  | MIT

<!-- Describe your changes below in as much detail as possible -->
Named tuples can have labels which are reserved keywords. At the same time keywords are not valid types (i.e. type X = [function] is invalid).

<a href="https://gitpod.io/#https://github.com/babel/babel/pull/13743"><img src="https://gitpod.io/button/open-in-gitpod.svg"/></a>



Hey @happycollision! We really appreciate you taking the time to report an issue. The  collaborators on this project attempt to help as many people as  possible, but we're a limited number of volunteers, so it's  possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a  vibrant [Slack community](https://babeljs.slack.com) that typically always has someone  willing to help. You can sign-up [here](https://slack.babeljs.io/) for an invite."
Thanks for the bug report!

The problem is in the `tsParseTupleElementType` parser function: https://github.com/babel/babel/blob/1355d0078ca4df9e38f382d2f42684b860e60f6d/packages/babel-parser/src/plugins/typescript/index.js#L882-L892

Keywords are not valid types (i.e. `type X = [function]` is invalid), so the `tsParseType()` call at line 888 fails. We should be able to fix it by:
1. Checking if the current token is a keyword (if `this.state.type.keyword` is `true`)
  1. If it is not a keyword, then we can keep the current logic.
  2. Otherwise, we should:
    1. Parse the label as an identifier, using `this.parseIdentifier(/* allow keywords */ true)`.
    2. Consume a `:` token, using `this.expect(tt.colon)`.
    3. Finish parsing the tuple element, as in https://github.com/babel/babel/blob/1355d0078ca4df9e38f382d2f42684b860e60f6d/packages/babel-parser/src/plugins/typescript/index.js#L910-L911

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Hi! Can I pick this bug?
Sure, it's yours! If you need any help feel free to ask.
Hey @nicolo-ribaudo pardon my ignorance, I'm new to this codebase and I was wondering if there is any documentation for the internal methods such as `this.eat()` and `this.expect()`. Will greatly appreciate your assistance!
Nope, there are no docs available for internal parser methods, however you can ask on [Slack](https://slack.babeljs.io/) and you will surely find someone that can help you.
For example `eat(_token)` checks if the specified token matches the current state, if it does the methods skips it returning true, if it doesn't the methods returns false. It is just a sugar for `.matches(_token)` and `.next()`.

`expect(_token)` instead returns `unexpected()` error if the current state token does not match the provided one.
@fedeci Thank you so much for the explanation. Will definitely use the slack channel for these sorts of queries in the future!!
@aimanjaffer If you are asking because of this bug, please first leave some time (one more week) for @ChaitanyaGadodia since this bug is assigned to him :pray:
@nicolo-ribaudo Sure thing!!
@nicolo-ribaudo 
If this bug is not maintained since September, can I take it? I want to solve it and it is gonna be my first issue.
Thanks
I think the syntax is no correct, you should write this instead:
```ts
`type FuncWithDescription = {
  function: (...args: any[]) => any,
  string: string
}

const fnWithDescriptions: FuncWithDescription[] = [
  {
    function: (a,b,c) => a+b+c,
    string: 'Some string'
  }
]
```
@macluiggy 
I am defining a tuple with named positional values, not a function that has an extra property. It’s valid syntax, but Babel gets confused.

@ozanhonamlioglu
I am not a team member, but I am willing to bet you can grab it. 🤷‍♂️
@nicolo-ribaudo I see there is a PR in draft state, is this issue still available? 
Hello!
I tried to solve this issue (pr https://github.com/babel/babel/pull/15423 ), judging by the local test results (.\make test), everything seems to work locally, but some ci tests fail. Could somebody give me some guidence on this problem, please? 

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packages/babel-parser/test/unit/tokenizer/types.skip-bundled.js packages/babel-parser/test/options.js packages/babel-parser/test/plugin-options.js packages/babel-parser/test/error-codes.js packages/babel-parser/test/unit/util/identifier.skip-bundled.js packages/babel-parser/test/expressions.js packages/babel-parser/test/attachComment-false.js eslint/babel-eslint-tests/test/integration/duplicated-babel-parser.js
packages/babel-parser/test/index.js packages/babel-parser/test/estree-throws.js