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📄 no-useless-constructor

📊 Analysis Summary

Metric	Count
🔧 Functions	3
📦 Imports	6
📑 Type Aliases	2

📚 Table of Contents

• Default Export
• Imports
• Functions
• Type Aliases

🛠️ File Location:

📂 packages/eslint-plugin/src/rules/no-useless-constructor.ts

📤 Default Export

export default createRule<Options, MessageIds>({ ... })

Property	Value
name	'no-useless-constructor'
meta.type	'problem'
meta.docs.description	'Disallow unnecessary constructors'
meta.docs.extendsBaseRule	true
meta.docs.recommended	'strict'
meta.hasSuggestions	baseRule.meta.hasSuggestions
meta.messages	baseRule.meta.messages
meta.schema	baseRule.meta.schema
defaultOptions	[]

Entry point: create — documented under Functions.

---

📦 Imports

Name	Source
TSESTree	@typescript-eslint/utils
AST_NODE_TYPES	@typescript-eslint/utils
InferMessageIdsTypeFromRule	../util
InferOptionsTypeFromRule	../util
createRule	../util
getESLintCoreRule	../util/getESLintCoreRule

---

Functions

create(context: any): { MethodDefinition(node: any): void; }

Parameters:

• context any

Returns: { MethodDefinition(node: any): void; }

Calls:

• baseRule.create
• checkAccessibility
• checkParams
• rules.MethodDefinition

Code

create(context) {
    const rules = baseRule.create(context);
    return {
      MethodDefinition(node): void {
        if (
          node.value.type === AST_NODE_TYPES.FunctionExpression &&
          checkAccessibility(node) &&
          checkParams(node)
        ) {
          rules.MethodDefinition(node);
        }
      },
    };
  }

checkAccessibility(node: TSESTree.MethodDefinition): boolean

Check if method with accessibility is not useless

Raw JSDoc

/**
 * Check if method with accessibility is not useless
 */

Code

function checkAccessibility(node: TSESTree.MethodDefinition): boolean {
  switch (node.accessibility) {
    case 'protected':
    case 'private':
      return false;
    case 'public':
      if (node.parent.parent.superClass) {
        return false;
      }
      break;
  }
  return true;
}

checkParams(node: TSESTree.MethodDefinition): boolean

Check if method is not useless due to typescript parameter properties and decorators

Raw JSDoc

/**
 * Check if method is not useless due to typescript parameter properties and decorators
 */

Calls:

• node.value.params.some

Code

function checkParams(node: TSESTree.MethodDefinition): boolean {
  return !node.value.params.some(
    param =>
      param.type === AST_NODE_TYPES.TSParameterProperty ||
      param.decorators.length,
  );
}

---

Type Aliases

Options

type Options = InferOptionsTypeFromRule<typeof baseRule>;

MessageIds

type MessageIds = InferMessageIdsTypeFromRule<typeof baseRule>;

---

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