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oxc/no-this-in-exported-function Suspicious

What it does

Disallows the use of this in exported functions.

Why is this bad?

In most bundlers, the value of this is not preserved for exported functions. When a function is exported and imported in another module, this typically becomes undefined instead of the module namespace object. This can lead to unexpected runtime errors or incorrect behavior.

Examples

Examples of incorrect code for this rule:

export function foo() {
  console.log(this);
}

export default function bar() {
  this.something();
}

function baz() {
  const self = this;
}
export { baz };

Examples of correct code for this rule:

function foo() {
  console.log(this);
}

export const bar = () => {
  console.log(this);
};

How to use

To enable this rule using the config file or in the CLI, you can use:

Config (.oxlintrc.json)

{
  "rules": {
    "oxc/no-this-in-exported-function": "error"
  }
}

Config (oxlint.config.ts)

import { defineConfig } from "oxlint";

export default defineConfig({
  rules: {
    "oxc/no-this-in-exported-function": "error",
  },
});

CLI

oxlint --deny oxc/no-this-in-exported-function

Version

This rule was added in v1.33.0.

References

• Rule Source
• Open rule in Oxc Playground