47 lines
1.3 KiB
JavaScript
Vendored
47 lines
1.3 KiB
JavaScript
Vendored
"use strict";
|
|
|
|
exports.__esModule = true;
|
|
exports.default = _default;
|
|
|
|
/**
|
|
* Fixes block-shadowed let/const bindings in Safari 10/11.
|
|
* https://kangax.github.io/compat-table/es6/#test-let_scope_shadow_resolution
|
|
*/
|
|
function _default({
|
|
types: t
|
|
}) {
|
|
return {
|
|
name: "transform-safari-block-shadowing",
|
|
visitor: {
|
|
VariableDeclarator(path) {
|
|
// the issue only affects let and const bindings:
|
|
const kind = path.parent.kind;
|
|
if (kind !== "let" && kind !== "const") return; // ignore non-block-scoped bindings:
|
|
|
|
const block = path.scope.block;
|
|
if (t.isFunction(block) || t.isProgram(block)) return;
|
|
const bindings = t.getOuterBindingIdentifiers(path.node.id);
|
|
|
|
for (const name of Object.keys(bindings)) {
|
|
let scope = path.scope; // ignore parent bindings (note: impossible due to let/const?)
|
|
|
|
if (!scope.hasOwnBinding(name)) continue; // check if shadowed within the nearest function/program boundary
|
|
|
|
while (scope = scope.parent) {
|
|
if (scope.hasOwnBinding(name)) {
|
|
path.scope.rename(name);
|
|
break;
|
|
}
|
|
|
|
if (t.isFunction(scope.block) || t.isProgram(scope.block)) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
};
|
|
}
|
|
|
|
module.exports = exports.default; |