typescript - Why changing "const" value in Angular 2 does not give error? -

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the code simple:

const num = 1; num = 2; console.log('num', num);

in jsfiddle, browser console show following error, great:

uncaught typeerror: assignment constant variable.

however, same codes in angular 2 not give error, , @ end num equals 2. see plunker.

why changing "const" value in angular 2 not give error? bug? thanks

online typescript compiler default target lower 'es6', in generated code const replaced var compatibility, if change config.js to:

  typescriptoptions: {     emitdecoratormetadata: true,     target: 'es6'   }

compiler output const , you'll see error.


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