File: typeInferenceTypePredicate2.js

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node-typescript 3.3.3333-1
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//// [typeInferenceTypePredicate2.ts]
[true, true, false, null]
    .filter((thing): thing is boolean => thing !== null)
    .map(thing => thing.toString());


//// [typeInferenceTypePredicate2.js]
[true, true, false, null]
    .filter(function (thing) { return thing !== null; })
    .map(function (thing) { return thing.toString(); });