Description
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--keyofStringsOnlyadded in Support number and symbol named properties with keyof and mapped types #23592 -
--declarationMapfrom Declaration maps and transparent goto definition using them #22658 -
--resolveJsonModulefrom Resolve the modue names with "modulename.json" to json files when doing node module resolution #22167 - New lib file added in add lib.es2018.intl + fix lib.es2017.intl #23785
See checklist for work needed: https://github.com/Microsoft/TypeScript/wiki/Release-Activities#new-compiler-option-added