はじめに

AWS CDK TypeScriptプロジェクトを作成し、npm run build を実行したところ、下記のエラーが発生した。

node_modules/@types/babel__traverse/index.d.ts:68:50 - error TS1005: ']' expected.

68 export type ArrayKeys<T> = keyof { [P in keyof T as T[P] extends any[] ? P : never]: P };
                                                    ~~

node_modules/@types/babel__traverse/index.d.ts:68:53 - error TS1005: ';' expected.

68 export type ArrayKeys<T> = keyof { [P in keyof T as T[P] extends any[] ? P : never]: P };
                                                       ~

node_modules/@types/babel__traverse/index.d.ts:68:58 - error TS1005: ';' expected.

68 export type ArrayKeys<T> = keyof { [P in keyof T as T[P] extends any[] ? P : never]: P };
                                                            ~~~~~~~

node_modules/@types/babel__traverse/index.d.ts:68:70 - error TS1011: An element access expression should take an argument.

68 export type ArrayKeys<T> = keyof { [P in keyof T as T[P] extends any[] ? P : never]: P };
                                                                        

node_modules/@types/babel__traverse/index.d.ts:68:83 - error TS1005: ';' expected.

68 export type ArrayKeys<T> = keyof { [P in keyof T as T[P] extends any[] ? P : never]: P };
                                                                                     ~

node_modules/@types/babel__traverse/index.d.ts:68:84 - error TS1128: Declaration or statement expected.

68 export type ArrayKeys<T> = keyof { [P in keyof T as T[P] extends any[] ? P : never]: P };
                                                                                      ~

node_modules/@types/babel__traverse/index.d.ts:68:88 - error TS1128: Declaration or statement expected.

68 export type ArrayKeys<T> = keyof { [P in keyof T as T[P] extends any[] ? P : never]: P };
                                                                                          ~


Found 7 errors.

実施したこと

typescriptのバージョンを上げたら、ビルドできることが確認できた。

package.json

"typescript": "~3.9.7"

↓

package.json

"typescript": "^4.9.3"

最後に

参考にした文献を記す。
https://github.com/DefinitelyTyped/DefinitelyTyped/issues/63431