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59 lines
1.8 KiB
59 lines
1.8 KiB
"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 = require("@babel/plugin-syntax-nullish-coalescing-operator"); |
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var _core = require("@babel/core"); |
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var _default = (0, _helperPluginUtils.declare)((api, { |
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loose = false |
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}) => { |
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var _api$assumption; |
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api.assertVersion(7); |
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const noDocumentAll = (_api$assumption = api.assumption("noDocumentAll")) != null ? _api$assumption : loose; |
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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; |
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let assignment; |
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if (scope.isStatic(node.left)) { |
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ref = node.left; |
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assignment = _core.types.cloneNode(node.left); |
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} else if (scope.path.isPattern()) { |
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path.replaceWith(_core.template.ast`(() => ${path.node})()`); |
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return; |
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} else { |
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ref = scope.generateUidIdentifierBasedOnNode(node.left); |
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scope.push({ |
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id: _core.types.cloneNode(ref) |
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}); |
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assignment = _core.types.assignmentExpression("=", ref, node.left); |
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} |
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path.replaceWith(_core.types.conditionalExpression(noDocumentAll ? _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; |