eslint/lib/rules/no-constructor-return.js

   1 /**
   2  * @fileoverview Rule to disallow returning value from constructor.
   3  * @author Pig Fang <https://github.com/g-plane>
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Rule Definition
  10 //------------------------------------------------------------------------------
  11
  12 /** @type {import('../shared/types').Rule} */
  13 module.exports = {
  14     meta: {
  15         type: "problem",
  16
  17         docs: {
  18             description: "disallow returning value from constructor",
  19             recommended: false,
  20             url: "https://eslint.org/docs/rules/no-constructor-return"
  21         },
  22
  23         schema: {},
  24
  25         fixable: null,
  26
  27         messages: {
  28             unexpected: "Unexpected return statement in constructor."
  29         }
  30     },
  31
  32     create(context) {
  33         const stack = [];
  34
  35         return {
  36             onCodePathStart(_, node) {
  37                 stack.push(node);
  38             },
  39             onCodePathEnd() {
  40                 stack.pop();
  41             },
  42             ReturnStatement(node) {
  43                 const last = stack[stack.length - 1];
  44
  45                 if (!last.parent) {
  46                     return;
  47                 }
  48
  49                 if (
  50                     last.parent.type === "MethodDefinition" &&
  51                     last.parent.kind === "constructor" &&
  52                     (node.parent.parent === last || node.argument)
  53                 ) {
  54                     context.report({
  55                         node,
  56                         messageId: "unexpected"
  57                     });
  58                 }
  59             }
  60         };
  61     }
  62 };