fix: check preceding line break before exclamation (#14049)

2021-12-16 15:50:15 -05:00
parent 7178fbb008
commit ad17fe1cce
3 changed files with 61 additions and 1 deletions
--- a/packages/babel-parser/src/plugins/typescript/index.js
+++ b/packages/babel-parser/src/plugins/typescript/index.js
@@ -2832,7 +2832,11 @@ export default (superClass: Class<Parser>): Class<Parser> =>
      kind: "var" | "let" | "const",
    ): void {
      super.parseVarId(decl, kind);
-      if (decl.id.type === "Identifier" && this.eat(tt.bang)) {
+      if (
+        decl.id.type === "Identifier" &&
+        !this.hasPrecedingLineBreak() &&
+        this.eat(tt.bang)
+      ) {
        decl.definite = true;
      }