36 lines
535 B
Markdown
36 lines
535 B
Markdown
# babel-helper-evaluate-path
|
|
|
|
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
|
|
|
|
```sh
|
|
npm install babel-helper-evaluate-path
|
|
```
|