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evaluation: evaluate typeof UnaryExpression

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Henry Zhu 2015-09-01 23:29:04 -04:00
parent acc801897a
commit 5c58b52d40
1 changed files with 8 additions and 1 deletions
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9
packages/babel/src/traversal/path/evaluation.js
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@ -119,13 +119,20 @@ export function evaluate(): { confident: boolean; value: any } {
}
if (path.isUnaryExpression({ prefix: true })) {
var arg = evaluate(path.get("argument"));
var argument = path.get("argument");
var arg = evaluate(argument);
switch (node.operator) {
case "void": return undefined;
case "!": return !arg;
case "+": return +arg;
case "-": return -arg;
case "~": return ~arg;
case "typeof":
if (argument.isFunction()) {
return "function";
} else {
return typeof arg;
}
}
}