Throw a TypeError when reassigning a const (#12252)

packages/babel-helpers/src/helpers.js

@@ -871,7 +871,7 @@ helpers.taggedTemplateLiteralLoose = helper("7.0.0-beta.0")`
 
 helpers.readOnlyError = helper("7.0.0-beta.0")`
   export default function _readOnlyError(name) {
-    throw new Error("\\"" + name + "\\" is read-only");
+    throw new TypeError("\\"" + name + "\\" is read-only");
   }
 `;
 

packages/babel-plugin-transform-block-scoping/test/fixtures/const-violations/deadcode-violation/output.js

@@ -1,4 +1,4 @@
-function _readOnlyError(name) { throw new Error("\"" + name + "\" is read-only"); }
+function _readOnlyError(name) { throw new TypeError("\"" + name + "\" is read-only"); }
 
 (function () {
   var a = "foo";

packages/babel-plugin-transform-block-scoping/test/fixtures/const-violations/destructuring-assignment/output.js

@@ -1,4 +1,4 @@
-function _readOnlyError(name) { throw new Error("\"" + name + "\" is read-only"); }
+function _readOnlyError(name) { throw new TypeError("\"" + name + "\" is read-only"); }
 
 var a = 1,
     b = 2;

packages/babel-plugin-transform-block-scoping/test/fixtures/const-violations/loop/output.js

@@ -1,4 +1,4 @@
-function _readOnlyError(name) { throw new Error("\"" + name + "\" is read-only"); }
+function _readOnlyError(name) { throw new TypeError("\"" + name + "\" is read-only"); }
 
 for (var i = 0; i < 3; i = (_readOnlyError("i"), i + 1)) {
   console.log(i);

packages/babel-plugin-transform-block-scoping/test/fixtures/const-violations/nested-update-expressions/output.js

@@ -1,4 +1,4 @@
-function _readOnlyError(name) { throw new Error("\"" + name + "\" is read-only"); }
+function _readOnlyError(name) { throw new TypeError("\"" + name + "\" is read-only"); }
 
 var c = 17;
 var a = 0;

packages/babel-plugin-transform-block-scoping/test/fixtures/const-violations/no-assignment/output.js

@@ -1,4 +1,4 @@
-function _readOnlyError(name) { throw new Error("\"" + name + "\" is read-only"); }
+function _readOnlyError(name) { throw new TypeError("\"" + name + "\" is read-only"); }
 
 var MULTIPLIER = 5;
 MULTIPLIER = (_readOnlyError("MULTIPLIER"), "overwrite");

packages/babel-plugin-transform-block-scoping/test/fixtures/const-violations/no-for-in/output.js

@@ -1,4 +1,4 @@
-function _readOnlyError(name) { throw new Error("\"" + name + "\" is read-only"); }
+function _readOnlyError(name) { throw new TypeError("\"" + name + "\" is read-only"); }
 
 var MULTIPLIER = 5;
 

packages/babel-plugin-transform-block-scoping/test/fixtures/const-violations/update-expression-prefix/output.js

@@ -1,4 +1,4 @@
-function _readOnlyError(name) { throw new Error("\"" + name + "\" is read-only"); }
+function _readOnlyError(name) { throw new TypeError("\"" + name + "\" is read-only"); }
 
 var a = "str";
 _readOnlyError("a"), --a;

packages/babel-plugin-transform-block-scoping/test/fixtures/const-violations/update-expression/output.js

@@ -1,4 +1,4 @@
-function _readOnlyError(name) { throw new Error("\"" + name + "\" is read-only"); }
+function _readOnlyError(name) { throw new TypeError("\"" + name + "\" is read-only"); }
 
 var foo = 1;
 _readOnlyError("foo"), foo++;

packages/babel-plugin-transform-block-scoping/test/fixtures/exec/constant-violation.js

@@ -0,0 +1,2 @@
+const a = 1;
+expect(() => { a = 2 }).toThrow(TypeError);