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51 lines
1.6 KiB
51 lines
1.6 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 _pluginSyntaxNullishCoalescingOperator = _interopRequireDefault(require("@babel/plugin-syntax-nullish-coalescing-operator"));
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var _core = require("@babel/core");
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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var _default = (0, _helperPluginUtils.declare)((api, {
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loose = false
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}) => {
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api.assertVersion(7);
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return {
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name: "proposal-nullish-coalescing-operator",
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inherits: _pluginSyntaxNullishCoalescingOperator.default,
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visitor: {
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LogicalExpression(path) {
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const {
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node,
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scope
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} = path;
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if (node.operator !== "??") {
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return;
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}
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let ref = scope.maybeGenerateMemoised(node.left);
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let assignment;
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if (ref === null) {
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ref = node.left;
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assignment = _core.types.cloneNode(node.left);
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} else {
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assignment = _core.types.assignmentExpression("=", ref, node.left);
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}
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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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}
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}
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};
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});
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exports.default = _default;
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