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77 lines
1.9 KiB
77 lines
1.9 KiB
4 years ago
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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var _helperPluginUtils = require("@babel/helper-plugin-utils");
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var _core = require("@babel/core");
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var _default = (0, _helperPluginUtils.declare)(api => {
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api.assertVersion(7);
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return {
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name: "transform-new-target",
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visitor: {
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MetaProperty(path) {
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const meta = path.get("meta");
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const property = path.get("property");
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const {
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scope
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} = path;
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if (meta.isIdentifier({
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name: "new"
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}) && property.isIdentifier({
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name: "target"
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})) {
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const func = path.findParent(path => {
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if (path.isClass()) return true;
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if (path.isFunction() && !path.isArrowFunctionExpression()) {
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if (path.isClassMethod({
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kind: "constructor"
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})) {
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return false;
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}
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return true;
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}
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return false;
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});
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if (!func) {
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throw path.buildCodeFrameError("new.target must be under a (non-arrow) function or a class.");
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}
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const {
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node
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} = func;
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if (!node.id) {
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if (func.isMethod()) {
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path.replaceWith(scope.buildUndefinedNode());
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return;
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}
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node.id = scope.generateUidIdentifier("target");
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}
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const constructor = _core.types.memberExpression(_core.types.thisExpression(), _core.types.identifier("constructor"));
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if (func.isClass()) {
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path.replaceWith(constructor);
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return;
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}
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path.replaceWith(_core.types.conditionalExpression(_core.types.binaryExpression("instanceof", _core.types.thisExpression(), _core.types.cloneNode(node.id)), constructor, scope.buildUndefinedNode()));
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}
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}
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}
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};
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});
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exports.default = _default;
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