59 lines
1.8 KiB
JavaScript
59 lines
1.8 KiB
JavaScript
"use strict";
|
|
|
|
Object.defineProperty(exports, "__esModule", {
|
|
value: true
|
|
});
|
|
exports.default = void 0;
|
|
|
|
var _helperPluginUtils = require("@babel/helper-plugin-utils");
|
|
|
|
var _pluginSyntaxNullishCoalescingOperator = require("@babel/plugin-syntax-nullish-coalescing-operator");
|
|
|
|
var _core = require("@babel/core");
|
|
|
|
var _default = (0, _helperPluginUtils.declare)((api, {
|
|
loose = false
|
|
}) => {
|
|
var _api$assumption;
|
|
|
|
api.assertVersion(7);
|
|
const noDocumentAll = (_api$assumption = api.assumption("noDocumentAll")) != null ? _api$assumption : loose;
|
|
return {
|
|
name: "proposal-nullish-coalescing-operator",
|
|
inherits: _pluginSyntaxNullishCoalescingOperator.default,
|
|
visitor: {
|
|
LogicalExpression(path) {
|
|
const {
|
|
node,
|
|
scope
|
|
} = path;
|
|
|
|
if (node.operator !== "??") {
|
|
return;
|
|
}
|
|
|
|
let ref;
|
|
let assignment;
|
|
|
|
if (scope.isStatic(node.left)) {
|
|
ref = node.left;
|
|
assignment = _core.types.cloneNode(node.left);
|
|
} else if (scope.path.isPattern()) {
|
|
path.replaceWith(_core.template.statement.ast`(() => ${path.node})()`);
|
|
return;
|
|
} else {
|
|
ref = scope.generateUidIdentifierBasedOnNode(node.left);
|
|
scope.push({
|
|
id: _core.types.cloneNode(ref)
|
|
});
|
|
assignment = _core.types.assignmentExpression("=", ref, node.left);
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
}
|
|
};
|
|
});
|
|
|
|
exports.default = _default; |