stacktrace

    ERROR in node_modules/@angular/compiler-cli/src/ngtsc/file_system/src/types.d.ts:37:43 - error TS2591: Cannot find name 'Buffer'. Do you need to install
 type definitions for node? Try `npm i @types/node` and then add `node` to the types field in your tsconfig.

    37     readFileBuffer(path: AbsoluteFsPath): Buffer;
                                                 ~~~~~~
    node_modules/@angular/compiler-cli/src/ngtsc/file_system/src/types.d.ts:38:52 - error TS2591: Cannot find name 'Buffer'. Do you need to install type def
initions for node? Try `npm i @types/node` and then add `node` to the types field in your tsconfig.

    38     writeFile(path: AbsoluteFsPath, data: string | Buffer, exclusive?: boolean): void;
                                                          ~~~~~~
    node_modules/@angular/compiler-cli/src/ngtsc/file_system/testing/src/mock_file_system.d.ts:21:43 - error TS2591: Cannot find name 'Buffer'. Do you need
to install type definitions for node? Try `npm i @types/node` and then add `node` to the types field in your tsconfig.

    21     readFileBuffer(path: AbsoluteFsPath): Buffer;
                                                 ~~~~~~
    node_modules/@angular/compiler-cli/src/ngtsc/file_system/testing/src/mock_file_system.d.ts:22:52 - error TS2591: Cannot find name 'Buffer'. Do you need
to install type definitions for node? Try `npm i @types/node` and then add `node` to the types field in your tsconfig.

    22     writeFile(path: AbsoluteFsPath, data: string | Buffer, exclusive?: boolean): void;
                                                          ~~~~~~
    node_modules/@angular/compiler-cli/src/ngtsc/file_system/testing/src/mock_file_system.d.ts:63:37 - error TS2591: Cannot find name 'Buffer'. Do you need
to install type definitions for node? Try `npm i @types/node` and then add `node` to the types field in your tsconfig.

    63 export declare type File = string | Buffer;
                                           ~~~~~~