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boopathi merged 1 commit into from
Aug 9, 2017
Merged

Add helper evaluate docs [skip ci] #649

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28 changes: 27 additions & 1 deletion packages/babel-helper-evaluate-path/README.md
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@@ -1,6 +1,32 @@
# # babel-helper-evaluate-path
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@existentialism existentialism Aug 9, 2017

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Btw, just noticed an extra "#" :)

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@vigneshshanmugam vigneshshanmugam Aug 9, 2017

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good catch, addressed 391440b


`path.evaluate` wrapped in a try catch
A wrapper for babel's `path.evaluate`

Fixes / Features:

+ Detect usages before initialization / declaration

```js
function foo() {
console.log(b); // ReferenceError
let b = 1;
}

function bar() {
console.log(a); // a is void 0
var a = 5;
console.log(a); // 5
}
```

+ Detect usages in scopes outside of initialization for vars (hoisted)

```js
function foo() {
if (a) var x = 5;
console.log(x); // cannot determine
}
```

## Installation

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