perf: Move input to state and precalculate length

This also fixes a bug with async functions
2019-01-15 12:45:36 -08:00
parent ae154c86ed
commit 2dc1c91955
12 changed files with 160 additions and 126 deletions
--- a/packages/babel-parser/src/parser/util.js
+++ b/packages/babel-parser/src/parser/util.js
@@ -87,7 +87,7 @@ export default class UtilParser extends Tokenizer {

  hasPrecedingLineBreak(): boolean {
    return lineBreak.test(
-      this.input.slice(this.state.lastTokEnd, this.state.start),
+      this.state.input.slice(this.state.lastTokEnd, this.state.start),
    );
  }