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 _pluginSyntaxNullishCoalescingOperator = _interopRequireDefault(require("@babel/plugin-syntax-nullish-coalescing-operator"));
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11 |
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12 | var _core = require("@babel/core");
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13 |
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14 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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15 |
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16 | var _default = (0, _helperPluginUtils.declare)((api, {
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17 | loose = false
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18 | }) => {
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19 | api.assertVersion(7);
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20 | return {
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21 | name: "proposal-nullish-coalescing-operator",
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22 | inherits: _pluginSyntaxNullishCoalescingOperator.default,
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23 | visitor: {
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24 | LogicalExpression(path) {
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25 | const {
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26 | node,
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27 | scope
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28 | } = path;
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29 |
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30 | if (node.operator !== "??") {
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31 | return;
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32 | }
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33 |
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34 | let ref;
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35 | let assignment;
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36 |
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37 | if (scope.isStatic(node.left)) {
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38 | ref = node.left;
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39 | assignment = _core.types.cloneNode(node.left);
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40 | } else if (scope.path.isPattern()) {
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41 | path.replaceWith(_core.template.ast`(() => ${path.node})()`);
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42 | return;
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43 | } else {
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44 | ref = scope.generateUidIdentifierBasedOnNode(node.left);
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45 | scope.push({
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46 | id: _core.types.cloneNode(ref)
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47 | });
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48 | assignment = _core.types.assignmentExpression("=", ref, node.left);
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49 | }
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50 |
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51 | path.replaceWith(_core.types.conditionalExpression(loose ? _core.types.binaryExpression("!=", assignment, _core.types.nullLiteral()) : _core.types.logicalExpression("&&", _core.types.binaryExpression("!==", assignment, _core.types.nullLiteral()), _core.types.binaryExpression("!==", _core.types.cloneNode(ref), scope.buildUndefinedNode())), _core.types.cloneNode(ref), node.right));
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52 | }
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53 |
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54 | }
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55 | };
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56 | });
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57 |
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58 | exports.default = _default; |
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