javascript - Map.prototype.set returns with undefined in internet explorer 11 -


i'm trying build react application, , use react-css-modules. runs fine under ff , chrome, in ie11 encounter following issue, @ page loading following exception message:

unable property 'set' of undefined or null reference

it seems issue occurs in generateappendclassname (line 37) of react-css-modules, stylesindexmap remain undefined. seems following operation set undefined map.

stylesindexmap = stylesindex.set(styles, new _simplemap2.default());

in theory map.set should return map under ie11, understand problem?


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