diff --git a/ecmascript/parser/src/parser/expr/mod.rs b/ecmascript/parser/src/parser/expr/mod.rs
index b716afb55d1..bce2d4a938e 100644
--- a/ecmascript/parser/src/parser/expr/mod.rs
+++ b/ecmascript/parser/src/parser/expr/mod.rs
@@ -999,8 +999,6 @@ impl<'a, I: Input> Parser<'a, I> {
         // as a pattern instead of reparsing)
         while !eof!() && !is!(')') {
             if first {
-                first = false;
-
                 if is!("async") {
                     // https://github.com/swc-project/swc/issues/410
                     self.state.potential_arrow_start = Some(cur_pos!());
@@ -1159,6 +1157,46 @@ impl<'a, I: Input> Parser<'a, I> {
             } else {
                 items.push(PatOrExprOrSpread::ExprOrSpread(arg));
             }
+
+            // https://github.com/swc-project/swc/issues/433
+            if first && eat!("=>") && {
+                debug_assert_eq!(items.len(), 1);
+                match items[0] {
+                    PatOrExprOrSpread::ExprOrSpread(ExprOrSpread { ref expr, .. })
+                    | PatOrExprOrSpread::Pat(Pat::Expr(ref expr)) => match **expr {
+                        Expr::Ident(..) => true,
+                        _ => false,
+                    },
+                    PatOrExprOrSpread::Pat(Pat::Ident(..)) => true,
+                    _ => false,
+                }
+            } {
+                let params = self
+                    .parse_paren_items_as_params(items)?
+                    .into_iter()
+                    .collect();
+
+                let body: BlockStmtOrExpr = self.parse_fn_body(false, false)?;
+                expect!(')');
+                let span = span!(start);
+                return Ok(vec![PatOrExprOrSpread::ExprOrSpread(ExprOrSpread {
+                    expr: Box::new(
+                        ArrowExpr {
+                            span,
+                            body,
+                            is_async: false,
+                            is_generator: false,
+                            params,
+                            type_params: None,
+                            return_type: None,
+                        }
+                        .into(),
+                    ),
+                    spread: None,
+                })]);
+            }
+
+            first = false;
         }
 
         expect!(')');
diff --git a/ecmascript/parser/tests/test262-error-references/fail/7f9bbf314145e16f.js.stderr b/ecmascript/parser/tests/test262-error-references/fail/7f9bbf314145e16f.js.stderr
index 3df5d0c2748..7a8ecf05f38 100644
--- a/ecmascript/parser/tests/test262-error-references/fail/7f9bbf314145e16f.js.stderr
+++ b/ecmascript/parser/tests/test262-error-references/fail/7f9bbf314145e16f.js.stderr
@@ -1,6 +1,6 @@
-error: Expected Comma, got Some(Arrow)
- --> $DIR/tests/test262-parser/fail/7f9bbf314145e16f.js:1:4
+error: Expected Comma, got Some(Num(0.0))
+ --> $DIR/tests/test262-parser/fail/7f9bbf314145e16f.js:1:6
   |
 1 | ({}=>0)
-  |    ^^
+  |      ^
 
diff --git a/ecmascript/parser/tests/typescript/custom/issue-433-1/input.ts b/ecmascript/parser/tests/typescript/custom/issue-433-1/input.ts
new file mode 100644
index 00000000000..ed97112378b
--- /dev/null
+++ b/ecmascript/parser/tests/typescript/custom/issue-433-1/input.ts
@@ -0,0 +1 @@
+const result = (x => x)(1);
diff --git a/ecmascript/parser/tests/typescript/custom/issue-433-1/input.ts.json b/ecmascript/parser/tests/typescript/custom/issue-433-1/input.ts.json
new file mode 100644
index 00000000000..0495308ff8d
--- /dev/null
+++ b/ecmascript/parser/tests/typescript/custom/issue-433-1/input.ts.json
@@ -0,0 +1,203 @@
+{
+  "type": "Module",
+  "span": {
+    "start": 0,
+    "end": 27,
+    "ctxt": 0,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 27
+      }
+    }
+  },
+  "body": [
+    {
+      "type": "VariableDeclaration",
+      "span": {
+        "start": 0,
+        "end": 27,
+        "ctxt": 0,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 27
+          }
+        }
+      },
+      "kind": "const",
+      "declare": false,
+      "declarations": [
+        {
+          "type": "VariableDeclarator",
+          "span": {
+            "start": 6,
+            "end": 26,
+            "ctxt": 0,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 6
+              },
+              "end": {
+                "line": 1,
+                "column": 26
+              }
+            }
+          },
+          "id": {
+            "type": "Identifier",
+            "span": {
+              "start": 6,
+              "end": 12,
+              "ctxt": 0,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 12
+                }
+              }
+            },
+            "value": "result",
+            "optional": false
+          },
+          "init": {
+            "type": "CallExpression",
+            "span": {
+              "start": 15,
+              "end": 26,
+              "ctxt": 0,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 15
+                },
+                "end": {
+                  "line": 1,
+                  "column": 26
+                }
+              }
+            },
+            "callee": {
+              "type": "ParenthesisExpression",
+              "span": {
+                "start": 15,
+                "end": 23,
+                "ctxt": 0,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 15
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 23
+                  }
+                }
+              },
+              "expression": {
+                "type": "ArrowFunctionExpression",
+                "span": {
+                  "start": 16,
+                  "end": 23,
+                  "ctxt": 0,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 16
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 23
+                    }
+                  }
+                },
+                "params": [
+                  {
+                    "type": "Identifier",
+                    "span": {
+                      "start": 16,
+                      "end": 17,
+                      "ctxt": 0,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 16
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 17
+                        }
+                      }
+                    },
+                    "value": "x",
+                    "optional": false
+                  }
+                ],
+                "body": {
+                  "type": "Identifier",
+                  "span": {
+                    "start": 21,
+                    "end": 22,
+                    "ctxt": 0,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 21
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 22
+                      }
+                    }
+                  },
+                  "value": "x",
+                  "optional": false
+                },
+                "async": false,
+                "generator": false
+              }
+            },
+            "arguments": [
+              {
+                "expr": {
+                  "type": "NumericLiteral",
+                  "span": {
+                    "start": 24,
+                    "end": 25,
+                    "ctxt": 0,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 24
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 25
+                      }
+                    }
+                  },
+                  "value": 1.0
+                }
+              }
+            ],
+            "typeArguments": null
+          },
+          "definite": false
+        }
+      ]
+    }
+  ]
+}
diff --git a/ecmascript/parser/tests/typescript/custom/issue-433-2/input.ts b/ecmascript/parser/tests/typescript/custom/issue-433-2/input.ts
new file mode 100644
index 00000000000..7ef6e77f8c9
--- /dev/null
+++ b/ecmascript/parser/tests/typescript/custom/issue-433-2/input.ts
@@ -0,0 +1 @@
+const result2 = ((x: number) => x)(1);
diff --git a/ecmascript/parser/tests/typescript/custom/issue-433-2/input.ts.json b/ecmascript/parser/tests/typescript/custom/issue-433-2/input.ts.json
new file mode 100644
index 00000000000..f33d79940f7
--- /dev/null
+++ b/ecmascript/parser/tests/typescript/custom/issue-433-2/input.ts.json
@@ -0,0 +1,240 @@
+{
+  "type": "Module",
+  "span": {
+    "start": 0,
+    "end": 38,
+    "ctxt": 0,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 38
+      }
+    }
+  },
+  "body": [
+    {
+      "type": "VariableDeclaration",
+      "span": {
+        "start": 0,
+        "end": 38,
+        "ctxt": 0,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 38
+          }
+        }
+      },
+      "kind": "const",
+      "declare": false,
+      "declarations": [
+        {
+          "type": "VariableDeclarator",
+          "span": {
+            "start": 6,
+            "end": 37,
+            "ctxt": 0,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 6
+              },
+              "end": {
+                "line": 1,
+                "column": 37
+              }
+            }
+          },
+          "id": {
+            "type": "Identifier",
+            "span": {
+              "start": 6,
+              "end": 13,
+              "ctxt": 0,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 13
+                }
+              }
+            },
+            "value": "result2",
+            "optional": false
+          },
+          "init": {
+            "type": "CallExpression",
+            "span": {
+              "start": 16,
+              "end": 37,
+              "ctxt": 0,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 16
+                },
+                "end": {
+                  "line": 1,
+                  "column": 37
+                }
+              }
+            },
+            "callee": {
+              "type": "ParenthesisExpression",
+              "span": {
+                "start": 16,
+                "end": 34,
+                "ctxt": 0,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 16
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 34
+                  }
+                }
+              },
+              "expression": {
+                "type": "ArrowFunctionExpression",
+                "span": {
+                  "start": 17,
+                  "end": 33,
+                  "ctxt": 0,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 17
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 33
+                    }
+                  }
+                },
+                "params": [
+                  {
+                    "type": "Identifier",
+                    "span": {
+                      "start": 18,
+                      "end": 19,
+                      "ctxt": 0,
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 18
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 19
+                        }
+                      }
+                    },
+                    "value": "x",
+                    "typeAnnotation": {
+                      "type": "TsTypeAnnotation",
+                      "span": {
+                        "start": 19,
+                        "end": 27,
+                        "ctxt": 0,
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 19
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 27
+                          }
+                        }
+                      },
+                      "typeAnnotation": {
+                        "type": "TsKeywordType",
+                        "span": {
+                          "start": 21,
+                          "end": 27,
+                          "ctxt": 0,
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 21
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 27
+                            }
+                          }
+                        },
+                        "kind": "number"
+                      }
+                    },
+                    "optional": false
+                  }
+                ],
+                "body": {
+                  "type": "Identifier",
+                  "span": {
+                    "start": 32,
+                    "end": 33,
+                    "ctxt": 0,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 32
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 33
+                      }
+                    }
+                  },
+                  "value": "x",
+                  "optional": false
+                },
+                "async": false,
+                "generator": false
+              }
+            },
+            "arguments": [
+              {
+                "expr": {
+                  "type": "NumericLiteral",
+                  "span": {
+                    "start": 35,
+                    "end": 36,
+                    "ctxt": 0,
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 35
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 36
+                      }
+                    }
+                  },
+                  "value": 1.0
+                }
+              }
+            ],
+            "typeArguments": null
+          },
+          "definite": false
+        }
+      ]
+    }
+  ]
+}