50 lines
2.2 KiB
JavaScript
50 lines
2.2 KiB
JavaScript
"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 _core = require("@babel/core");
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var _default = exports.default = (0, _helperPluginUtils.declare)((api, {
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loose = false
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}) => {
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var _api$assumption, _api$assumption2;
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api.assertVersion("^7.0.0-0 || >8.0.0-alpha <8.0.0-beta");
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const noDocumentAll = (_api$assumption = api.assumption("noDocumentAll")) != null ? _api$assumption : loose;
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const pureGetters = (_api$assumption2 = api.assumption("pureGetters")) != null ? _api$assumption2 : false;
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return {
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name: "transform-nullish-coalescing-operator",
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manipulateOptions: (_, parser) => parser.plugins.push("nullishCoalescingOperator"),
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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 (pureGetters && scope.path.isPattern() && _core.types.isMemberExpression(node.left) && !node.left.computed && _core.types.isIdentifier(node.left.object) && _core.types.isIdentifier(node.left.property) || _core.types.isIdentifier(node.left) && (pureGetters || scope.hasBinding(node.left.name))) {
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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.statement.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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//# sourceMappingURL=index.js.map
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