Sha256: bb72fa08d1089b1a6e7bd9ffaa3605d15e5bb51efc76f0cf017cdb3b555984dc
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Size: 1.24 KB
Versions: 35
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Contents
/**
* Fixes block-shadowed let/const bindings in Safari 10/11.
* https://kangax.github.io/compat-table/es6/#test-let_scope_shadow_resolution
*/
export default function({ 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;
}
}
}
},
},
};
}
Version data entries
35 entries across 34 versions & 7 rubygems