1 | "use strict";
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.default = void 0;
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7 |
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8 | var _helperPluginUtils = require("@babel/helper-plugin-utils");
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9 |
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10 | var _core = require("@babel/core");
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11 |
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12 | var _default = (0, _helperPluginUtils.declare)(api => {
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13 | api.assertVersion(7);
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14 | return {
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15 | name: "transform-new-target",
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16 | visitor: {
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17 | MetaProperty(path) {
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18 | const meta = path.get("meta");
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19 | const property = path.get("property");
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20 | const {
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21 | scope
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22 | } = path;
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23 |
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24 | if (meta.isIdentifier({
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25 | name: "new"
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26 | }) && property.isIdentifier({
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27 | name: "target"
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28 | })) {
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29 | const func = path.findParent(path => {
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30 | if (path.isClass()) return true;
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31 |
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32 | if (path.isFunction() && !path.isArrowFunctionExpression()) {
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33 | if (path.isClassMethod({
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34 | kind: "constructor"
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35 | })) {
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36 | return false;
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37 | }
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38 |
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39 | return true;
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40 | }
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41 |
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42 | return false;
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43 | });
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44 |
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45 | if (!func) {
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46 | throw path.buildCodeFrameError("new.target must be under a (non-arrow) function or a class.");
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47 | }
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48 |
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49 | const {
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50 | node
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51 | } = func;
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52 |
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53 | if (_core.types.isMethod(node)) {
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54 | path.replaceWith(scope.buildUndefinedNode());
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55 | return;
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56 | }
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57 |
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58 | const constructor = _core.types.memberExpression(_core.types.thisExpression(), _core.types.identifier("constructor"));
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59 |
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60 | if (func.isClass()) {
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61 | path.replaceWith(constructor);
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62 | return;
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63 | }
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64 |
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65 | if (!node.id) {
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66 | node.id = scope.generateUidIdentifier("target");
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67 | } else {
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68 | let scope = path.scope;
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69 | const name = node.id.name;
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70 |
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71 | while (scope !== func.parentPath.scope) {
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72 | if (scope.hasOwnBinding(name) && !scope.bindingIdentifierEquals(name, node.id)) {
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73 | scope.rename(name);
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74 | }
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75 |
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76 | scope = scope.parent;
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77 | }
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78 | }
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79 |
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80 | path.replaceWith(_core.types.conditionalExpression(_core.types.binaryExpression("instanceof", _core.types.thisExpression(), _core.types.cloneNode(node.id)), constructor, scope.buildUndefinedNode()));
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81 | }
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82 | }
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83 |
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84 | }
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85 | };
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86 | });
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87 |
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88 | exports.default = _default; |
\ | No newline at end of file |