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const nameAgeMap: { [index: string]: number } = {}; nameAgeMap.Jack = 25; // no error nameAgeMap.Mark = "Fifty"; // Error: Type 'string' is not assignable to type 'number'. console.log(nameAgeMap);
prog.ts(3,7): error TS2322: Type 'string' is not assignable to type 'number'.