Last change
on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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File size:
1.9 KB
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[6a3a178] | 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 (!node.id) {
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| 54 | if (func.isMethod()) {
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| 55 | path.replaceWith(scope.buildUndefinedNode());
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| 56 | return;
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| 57 | }
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| 58 |
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| 59 | node.id = scope.generateUidIdentifier("target");
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| 60 | }
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| 61 |
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| 62 | const constructor = _core.types.memberExpression(_core.types.thisExpression(), _core.types.identifier("constructor"));
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| 63 |
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| 64 | if (func.isClass()) {
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| 65 | path.replaceWith(constructor);
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| 66 | return;
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| 67 | }
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| 68 |
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| 69 | path.replaceWith(_core.types.conditionalExpression(_core.types.binaryExpression("instanceof", _core.types.thisExpression(), _core.types.cloneNode(node.id)), constructor, scope.buildUndefinedNode()));
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| 70 | }
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| 71 | }
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| 72 |
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| 73 | }
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| 74 | };
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| 75 | });
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| 76 |
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| 77 | exports.default = _default; |
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