perf: partially replace .concat with .push (#13609)

2021-08-14 16:57:06 +02:00
parent 6a651e4641
commit 10640b2aad
18 changed files with 93 additions and 74 deletions
--- a/packages/babel-parser/src/plugins/flow/index.js
+++ b/packages/babel-parser/src/plugins/flow/index.js
@@ -1961,7 +1961,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>

        if (failed && valid.length === 1) {
          this.state = state;
-          this.state.noArrowAt = noArrowAt.concat(valid[0].start);
+          noArrowAt.push(valid[0].start);
+          this.state.noArrowAt = noArrowAt;
          ({ consequent, failed } = this.tryParseConditionalConsequent());
        }
      }