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Disallow aliasing this (no-this-alias)

This rule prohibits assigning variables to this.

Rule Details

Rationale from TSLint:

Assigning a variable to this instead of properly using arrow lambdas may be a symptom of pre-ES6 practices or not managing scope well.

Instead of storing a reference to this and using it inside a function () {:

const self = this;

setTimeout(function () {
  self.doWork();
});

Use () => arrow lambdas, as they preserve this scope for you:

setTimeout(() => {
  this.doWork();
});

Examples of incorrect code for this rule:

(see the rationale above)

Examples of correct code for this rule:

(see the rationale above)

Options

You can pass an object option:

{
  "@typescript-eslint/no-this-alias": [
    "error",
    {
      "allowDestructuring": false, // Disallow `const { props, state } = this`; true by default
      "allowedNames": ["self"] // Allow `const self = this`; `[]` by default
    }
  ]
}

When Not To Use It

If you need to assign this to variables, you shouldn’t use this rule.

Attributes

  • ✅ Recommended
  • 🔧 Fixable
  • 💭 Requires type information