no-class-assign.js 1.5 KB

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  1. /**
  2. * @fileoverview A rule to disallow modifying variables of class declarations
  3. * @author Toru Nagashima
  4. */
  5. "use strict";
  6. const astUtils = require("./utils/ast-utils");
  7. //------------------------------------------------------------------------------
  8. // Rule Definition
  9. //------------------------------------------------------------------------------
  10. /** @type {import('../types').Rule.RuleModule} */
  11. module.exports = {
  12. meta: {
  13. type: "problem",
  14. docs: {
  15. description: "Disallow reassigning class members",
  16. recommended: true,
  17. url: "https://eslint.org/docs/latest/rules/no-class-assign",
  18. },
  19. schema: [],
  20. messages: {
  21. class: "'{{name}}' is a class.",
  22. },
  23. },
  24. create(context) {
  25. const sourceCode = context.sourceCode;
  26. /**
  27. * Finds and reports references that are non initializer and writable.
  28. * @param {Variable} variable A variable to check.
  29. * @returns {void}
  30. */
  31. function checkVariable(variable) {
  32. astUtils
  33. .getModifyingReferences(variable.references)
  34. .forEach(reference => {
  35. context.report({
  36. node: reference.identifier,
  37. messageId: "class",
  38. data: { name: reference.identifier.name },
  39. });
  40. });
  41. }
  42. /**
  43. * Finds and reports references that are non initializer and writable.
  44. * @param {ASTNode} node A ClassDeclaration/ClassExpression node to check.
  45. * @returns {void}
  46. */
  47. function checkForClass(node) {
  48. sourceCode.getDeclaredVariables(node).forEach(checkVariable);
  49. }
  50. return {
  51. ClassDeclaration: checkForClass,
  52. ClassExpression: checkForClass,
  53. };
  54. },
  55. };