index.js 1.9 KB

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  1. "use strict";
  2. Object.defineProperty(exports, "__esModule", {
  3. value: true
  4. });
  5. exports.default = void 0;
  6. var _helperPluginUtils = require("@babel/helper-plugin-utils");
  7. var _pluginSyntaxLogicalAssignmentOperators = _interopRequireDefault(require("@babel/plugin-syntax-logical-assignment-operators"));
  8. var _core = require("@babel/core");
  9. function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  10. var _default = (0, _helperPluginUtils.declare)(api => {
  11. api.assertVersion(7);
  12. return {
  13. name: "proposal-logical-assignment-operators",
  14. inherits: _pluginSyntaxLogicalAssignmentOperators.default,
  15. visitor: {
  16. AssignmentExpression(path) {
  17. const {
  18. node,
  19. scope
  20. } = path;
  21. const {
  22. operator,
  23. left,
  24. right
  25. } = node;
  26. const operatorTrunc = operator.slice(0, -1);
  27. if (!_core.types.LOGICAL_OPERATORS.includes(operatorTrunc)) {
  28. return;
  29. }
  30. const lhs = _core.types.cloneNode(left);
  31. if (_core.types.isMemberExpression(left)) {
  32. const {
  33. object,
  34. property,
  35. computed
  36. } = left;
  37. const memo = scope.maybeGenerateMemoised(object);
  38. if (memo) {
  39. left.object = memo;
  40. lhs.object = _core.types.assignmentExpression("=", _core.types.cloneNode(memo), object);
  41. }
  42. if (computed) {
  43. const memo = scope.maybeGenerateMemoised(property);
  44. if (memo) {
  45. left.property = memo;
  46. lhs.property = _core.types.assignmentExpression("=", _core.types.cloneNode(memo), property);
  47. }
  48. }
  49. }
  50. path.replaceWith(_core.types.logicalExpression(operatorTrunc, lhs, _core.types.assignmentExpression("=", left, right)));
  51. }
  52. }
  53. };
  54. });
  55. exports.default = _default;