42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
|
"use strict";
|
||
|
|
||
|
exports.__esModule = true;
|
||
|
exports.default = void 0;
|
||
|
|
||
|
/**
|
||
|
* Safari ~11 has an issue where variable declarations in a For statement throw if they shadow parameters.
|
||
|
* This is fixed by renaming any declarations in the left/init part of a For* statement so they don't shadow.
|
||
|
* @see https://bugs.webkit.org/show_bug.cgi?id=171041
|
||
|
*
|
||
|
* @example
|
||
|
* e => { for (let e of []) e } // throws
|
||
|
* e => { for (let _e of []) _e } // works
|
||
|
*/
|
||
|
function handle(declaration) {
|
||
|
if (!declaration.isVariableDeclaration()) return;
|
||
|
const fn = declaration.getFunctionParent();
|
||
|
const {
|
||
|
name
|
||
|
} = declaration.node.declarations[0].id; // check if there is a shadowed binding coming from a parameter
|
||
|
|
||
|
if (fn && fn.scope.hasOwnBinding(name) && fn.scope.getOwnBinding(name).kind === "param") {
|
||
|
declaration.scope.rename(name);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
var _default = () => ({
|
||
|
name: "transform-safari-for-shadowing",
|
||
|
visitor: {
|
||
|
ForXStatement(path) {
|
||
|
handle(path.get("left"));
|
||
|
},
|
||
|
|
||
|
ForStatement(path) {
|
||
|
handle(path.get("init"));
|
||
|
}
|
||
|
|
||
|
}
|
||
|
});
|
||
|
|
||
|
exports.default = _default;
|
||
|
module.exports = exports.default;
|