typescript definitions for Worksheet.protect() and Worksheet.unprotect() have no explicit return values #925
Description
Exceljs 1.15.0 can no longer be used with TypeScript when the --noImplicitReturns compiler option is enabled as the build fails with the following messages:
node_modules/exceljs/index.d.ts:1154:2 - error TS7010: 'protect', which lacks return-type annotation, implicitly has an 'any' return type.
node_modules/exceljs/index.d.ts:1155:2 - error TS7010: 'unprotect', which lacks return-type annotation, implicitly has an 'any' return type.
This regression was introduced by commit f6468be ("Additional unit tests").