no-mutable-exports.js 5.7 KB

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  1. 'use strict';
  2. var _docsUrl = require('../docsUrl');
  3. var _docsUrl2 = _interopRequireDefault(_docsUrl);
  4. function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  5. module.exports = {
  6. meta: {
  7. type: 'suggestion',
  8. docs: {
  9. url: (0, _docsUrl2.default)('no-mutable-exports')
  10. },
  11. schema: []
  12. },
  13. create: function (context) {
  14. function checkDeclaration(node) {
  15. const kind = node.kind;
  16. if (kind === 'var' || kind === 'let') {
  17. context.report(node, `Exporting mutable '${kind}' binding, use 'const' instead.`);
  18. }
  19. }
  20. function checkDeclarationsInScope(_ref, name) {
  21. let variables = _ref.variables;
  22. for (let variable of variables) {
  23. if (variable.name === name) {
  24. for (let def of variable.defs) {
  25. if (def.type === 'Variable' && def.parent) {
  26. checkDeclaration(def.parent);
  27. }
  28. }
  29. }
  30. }
  31. }
  32. function handleExportDefault(node) {
  33. const scope = context.getScope();
  34. if (node.declaration.name) {
  35. checkDeclarationsInScope(scope, node.declaration.name);
  36. }
  37. }
  38. function handleExportNamed(node) {
  39. const scope = context.getScope();
  40. if (node.declaration) {
  41. checkDeclaration(node.declaration);
  42. } else if (!node.source) {
  43. for (let specifier of node.specifiers) {
  44. checkDeclarationsInScope(scope, specifier.local.name);
  45. }
  46. }
  47. }
  48. return {
  49. 'ExportDefaultDeclaration': handleExportDefault,
  50. 'ExportNamedDeclaration': handleExportNamed
  51. };
  52. }
  53. };
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