71 lines
2.3 KiB
JavaScript
Executable file
71 lines
2.3 KiB
JavaScript
Executable file
"use strict";
|
|
|
|
Object.defineProperty(exports, "__esModule", {
|
|
value: true
|
|
});
|
|
exports.default = void 0;
|
|
var _helperPluginUtils = require("@babel/helper-plugin-utils");
|
|
var _core = require("@babel/core");
|
|
var _default = exports.default = (0, _helperPluginUtils.declare)(api => {
|
|
api.assertVersion(7);
|
|
return {
|
|
name: "transform-new-target",
|
|
visitor: {
|
|
MetaProperty(path) {
|
|
const meta = path.get("meta");
|
|
const property = path.get("property");
|
|
const {
|
|
scope
|
|
} = path;
|
|
if (meta.isIdentifier({
|
|
name: "new"
|
|
}) && property.isIdentifier({
|
|
name: "target"
|
|
})) {
|
|
const func = path.findParent(path => {
|
|
if (path.isClass()) return true;
|
|
if (path.isFunction() && !path.isArrowFunctionExpression()) {
|
|
if (path.isClassMethod({
|
|
kind: "constructor"
|
|
})) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
});
|
|
if (!func) {
|
|
throw path.buildCodeFrameError("new.target must be under a (non-arrow) function or a class.");
|
|
}
|
|
const {
|
|
node
|
|
} = func;
|
|
if (_core.types.isMethod(node)) {
|
|
path.replaceWith(scope.buildUndefinedNode());
|
|
return;
|
|
}
|
|
const constructor = _core.types.memberExpression(_core.types.thisExpression(), _core.types.identifier("constructor"));
|
|
if (func.isClass()) {
|
|
path.replaceWith(constructor);
|
|
return;
|
|
}
|
|
if (!node.id) {
|
|
node.id = scope.generateUidIdentifier("target");
|
|
} else {
|
|
let scope = path.scope;
|
|
const name = node.id.name;
|
|
while (scope !== func.parentPath.scope) {
|
|
if (scope.hasOwnBinding(name) && !scope.bindingIdentifierEquals(name, node.id)) {
|
|
scope.rename(name);
|
|
}
|
|
scope = scope.parent;
|
|
}
|
|
}
|
|
path.replaceWith(_core.types.conditionalExpression(_core.types.binaryExpression("instanceof", _core.types.thisExpression(), _core.types.cloneNode(node.id)), constructor, scope.buildUndefinedNode()));
|
|
}
|
|
}
|
|
}
|
|
};
|
|
});
|
|
|
|
//# sourceMappingURL=index.js.map
|