Avoid lookahead

babel · Feb 12, 2021 · 370953a · 370953a
1 parent d80836c
commit 370953a
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Showing 2 changed files with 10 additions and 10 deletions.
diff --git a/packages/babel-parser/src/parser/expression.js b/packages/babel-parser/src/parser/expression.js
@@ -515,14 +515,12 @@ export default class ExpressionParser extends LValParser {
       this.next();
       return this.parseAwait(startPos, startLoc);
     }
-    if (this.isContextual("module")) {
-      const lookahead = this.lookahead();
-      if (
-        lookahead.type === tt.braceL &&
-        !this.hasPrecedingLineBreak(lookahead)
-      ) {
-        return this.parseModuleExpression();
-      }
+    if (
+      this.isContextual("module") &&
+      this.lookaheadCharCode() === charCodes.leftCurlyBrace &&
+      !this.hasFollowingLineBreak()
+    ) {
+      return this.parseModuleExpression();
     }
     const update = this.match(tt.incDec);
     const node = this.startNode();

diff --git a/packages/babel-parser/src/parser/util.js b/packages/babel-parser/src/parser/util.js
@@ -90,8 +90,10 @@ export default class UtilParser extends Tokenizer {
     );
   }
 
-  hasPrecedingLineBreak(state: State = this.state): boolean {
-    return lineBreak.test(this.input.slice(state.lastTokEnd, state.start));
+  hasPrecedingLineBreak(): boolean {
+    return lineBreak.test(
+      this.input.slice(this.state.lastTokEnd, this.state.start),
+    );
   }
 
   hasFollowingLineBreak(): boolean {