fix(babel-parser): chain off optionally chained keys named cla… (#11198)

* fix(babel-parser): chain off optionally chained keys named class and function Fixes #11197 * Extract override as variable to satisfy typechecker Flow did not trust that curContext.override would be defined
babel · Mar 3, 2020 · 2603c2e · 2603c2e
1 parent 8f281f5
commit 2603c2e
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Showing 3 changed files with 476 additions and 2 deletions.
diff --git a/packages/babel-parser/src/tokenizer/index.js b/packages/babel-parser/src/tokenizer/index.js
@@ -233,8 +233,9 @@ export default class Tokenizer extends LocationParser {
       return;
     }
 
-    if (curContext.override) {
-      curContext.override(this);
+    const override = curContext?.override;
+    if (override) {
+      override(this);
     } else {
       this.getTokenFromCode(this.input.codePointAt(this.state.pos));
     }

diff --git a/...0/optional-chaining/chaining-off-optionally-chained-keys-named-class-or-function/input.js b/...0/optional-chaining/chaining-off-optionally-chained-keys-named-class-or-function/input.js
@@ -0,0 +1,4 @@
+foo?.class.bar
+foo?.function.bar
+foo?.bar?.class.bar
+foo?.function?.bar