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📄 isAssignee.ts

📊 Analysis Summary

Metric	Count
🔧 Functions	1
📦 Imports	2
📊 Variables & Constants	1

📚 Table of Contents

• Imports
• Variables & Constants
• Functions

🛠️ File Location:

📂 packages/eslint-plugin/src/util/isAssignee.ts

📦 Imports

Name	Source
TSESTree	@typescript-eslint/utils
AST_NODE_TYPES	@typescript-eslint/utils

---

Variables & Constants

Name	Type	Kind	Value	Exported
parent	any	const	node.parent	✗

---

Functions

isAssignee(node: TSESTree.Node): boolean

Code

export function isAssignee(node: TSESTree.Node): boolean {
  const parent = node.parent;
  if (!parent) {
    return false;
  }

  // a[i] = 1, a[i] += 1, etc.
  if (
    parent.type === AST_NODE_TYPES.AssignmentExpression &&
    parent.left === node
  ) {
    return true;
  }

  // delete a[i]
  if (
    parent.type === AST_NODE_TYPES.UnaryExpression &&
    parent.operator === 'delete' &&
    parent.argument === node
  ) {
    return true;
  }

  // a[i]++, --a[i], etc.
  if (
    parent.type === AST_NODE_TYPES.UpdateExpression &&
    parent.argument === node
  ) {
    return true;
  }

  // [a[i]] = [0]
  if (parent.type === AST_NODE_TYPES.ArrayPattern) {
    return true;
  }

  // [...a[i]] = [0]
  if (parent.type === AST_NODE_TYPES.RestElement) {
    return true;
  }

  // ({ foo: a[i] }) = { foo: 0 }
  if (
    parent.type === AST_NODE_TYPES.Property &&
    parent.value === node &&
    parent.parent.type === AST_NODE_TYPES.ObjectExpression &&
    isAssignee(parent.parent)
  ) {
    return true;
  }

  // (a[i] as number)++, [...a[i]!] = [0], etc.
  if (
    (parent.type === AST_NODE_TYPES.TSNonNullExpression ||
      parent.type === AST_NODE_TYPES.TSAsExpression ||
      parent.type === AST_NODE_TYPES.TSTypeAssertion ||
      parent.type === AST_NODE_TYPES.TSSatisfiesExpression) &&
    isAssignee(parent)
  ) {
    return true;
  }

  return false;
}

• Parameters:
• node: TSESTree.Node
• Return Type: boolean
• Calls:
• isAssignee
• Internal Comments:

  // a[i] = 1, a[i] += 1, etc.
  // delete a[i]
  // a[i]++, --a[i], etc.
  // [a[i]] = [0]
  // [...a[i]] = [0]
  // ({ foo: a[i] }) = { foo: 0 }
  // (a[i] as number)++, [...a[i]!] = [0], etc.
  

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