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Add .success property to check if last call was resolved #19

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Add .success property to check if last call was resolved #19

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Commits on Jan 24, 2018

  1. Add .success property to check if last call was resolved 

    Sometimes nodes are supposed to resolve to `undefined`, so we can't rely
on that alone to check if an evaluation succeeded. This PR adds a
property that you can check after calling `evaluate`:

```js
var res = evaluate({ type: 'Identifier', name: 'undefined' })
if (evaluate.success) console.log(res)
else process.exit(1)
```
    @goto-bus-stop
    goto-bus-stop committed Jan 24, 2018
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