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babel-helper-evaluate-path

Fixes / Features:

  • Detect usages before initialization / declaration
JavaScript
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)
JavaScript
function foo() {
if (a) var x = 5;
console.log(x); // cannot determine
}

Installation

npm install babel-helper-evaluate-path --save-dev