demo project doesn't compile, bump target to ES2018

[fybx]

When trying to deploy the demo project the following error occurs:

> [email protected] start /media/yigid/share/shoka/repos/work/ts-pdf
> npm run build && lite-server -c ls-config.json


> [email protected] build
> npm run buildts && npm run buildru && npm run copypdfjsworker


> [email protected] buildts
> tsc && npm run copypngtotsc

src/document/entities/strings/date-string.ts:63:25 - error TS1503: Named capturing groups are only available when targeting 'ES2018' or later.

63     const result = /D:(?<Y>\d{4})(?<M>\d{2})(?<D>\d{2})(?<h>\d{2})(?<m>\d{2})(?<s>\d{2})/.exec(source);
                           ~~~

src/document/entities/strings/date-string.ts:63:36 - error TS1503: Named capturing groups are only available when targeting 'ES2018' or later.

63     const result = /D:(?<Y>\d{4})(?<M>\d{2})(?<D>\d{2})(?<h>\d{2})(?<m>\d{2})(?<s>\d{2})/.exec(source);
                                      ~~~

src/document/entities/strings/date-string.ts:63:47 - error TS1503: Named capturing groups are only available when targeting 'ES2018' or later.

63     const result = /D:(?<Y>\d{4})(?<M>\d{2})(?<D>\d{2})(?<h>\d{2})(?<m>\d{2})(?<s>\d{2})/.exec(source);
                                                 ~~~

src/document/entities/strings/date-string.ts:63:58 - error TS1503: Named capturing groups are only available when targeting 'ES2018' or later.

63     const result = /D:(?<Y>\d{4})(?<M>\d{2})(?<D>\d{2})(?<h>\d{2})(?<m>\d{2})(?<s>\d{2})/.exec(source);
                                                            ~~~

src/document/entities/strings/date-string.ts:63:69 - error TS1503: Named capturing groups are only available when targeting 'ES2018' or later.

63     const result = /D:(?<Y>\d{4})(?<M>\d{2})(?<D>\d{2})(?<h>\d{2})(?<m>\d{2})(?<s>\d{2})/.exec(source);
                                                                       ~~~

src/document/entities/strings/date-string.ts:63:80 - error TS1503: Named capturing groups are only available when targeting 'ES2018' or later.

63     const result = /D:(?<Y>\d{4})(?<M>\d{2})(?<D>\d{2})(?<h>\d{2})(?<m>\d{2})(?<s>\d{2})/.exec(source);
                                                                                  ~~~


Found 6 errors in the same file, starting at: src/document/entities/strings/date-string.ts:63

 ELIFECYCLE  Command failed with exit code 2.