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Lint Rules

noImportAssign (since v0.9.0)

This rule is recommended by Rome.

Disallow assigning to imported bindings

Examples

Invalid

import x from "y";
x = 1;
suspicious/noImportAssign.js:2:1 lint/suspicious/noImportAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The imported variable x is read-only
  
    1 │ import x from "y";
  > 2 │ x = 1;
      │ ^
    3 │ 
  
  ℹ The variable is imported here
  
  > 1 │ import x from "y";
      │        ^
    2 │ x = 1;
    3 │ 
  
  ℹ Use a local variable instead of reassigning an import.
  

import y from "y";
[y] = 1;
suspicious/noImportAssign.js:2:2 lint/suspicious/noImportAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The imported variable y is read-only
  
    1 │ import y from "y";
  > 2 │ [y] = 1;
      │  ^
    3 │ 
  
  ℹ The variable is imported here
  
  > 1 │ import y from "y";
      │        ^
    2 │ [y] = 1;
    3 │ 
  
  ℹ Use a local variable instead of reassigning an import.
  

import z from "y";
({ z } = 1); /// ```
```js,expect_diagnostic
import a from "y";
[...a] = 1;
suspicious/noImportAssign.js:3:4 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ unterminated template literal
  
    1 │ import z from "y";
    2 │ ({ z } = 1); /// ```
  > 3 │ ```js,expect_diagnostic
      │    ^^^^^^^^^^^^^^^^^^^^
  > 4 │ import a from "y";
  > 5 │ [...a] = 1;
  > 6 │ 
      │ 
  

import b from "y";
({ ...b } = 1);
suspicious/noImportAssign.js:2:7 lint/suspicious/noImportAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The imported variable b is read-only
  
    1 │ import b from "y";
  > 2 │ ({ ...b } = 1);
      │       ^
    3 │ 
  
  ℹ The variable is imported here
  
  > 1 │ import b from "y";
      │        ^
    2 │ ({ ...b } = 1);
    3 │ 
  
  ℹ Use a local variable instead of reassigning an import.
  

import c from "y";
for (c in y) {};
suspicious/noImportAssign.js:2:6 lint/suspicious/noImportAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The imported variable c is read-only
  
    1 │ import c from "y";
  > 2 │ for (c in y) {};
      │      ^
    3 │ 
  
  ℹ The variable is imported here
  
  > 1 │ import c from "y";
      │        ^
    2 │ for (c in y) {};
    3 │ 
  
  ℹ Use a local variable instead of reassigning an import.
  

import d from "y";
d += 1;
suspicious/noImportAssign.js:2:1 lint/suspicious/noImportAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The imported variable d is read-only
  
    1 │ import d from "y";
  > 2 │ d += 1;
      │ ^
    3 │ 
  
  ℹ The variable is imported here
  
  > 1 │ import d from "y";
      │        ^
    2 │ d += 1;
    3 │ 
  
  ℹ Use a local variable instead of reassigning an import.
  

import * as e from "y";
e = 1;
suspicious/noImportAssign.js:2:1 lint/suspicious/noImportAssign ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The imported variable e is read-only
  
    1 │ import * as e from "y";
  > 2 │ e = 1;
      │ ^
    3 │ 
  
  ℹ The variable is imported here
  
  > 1 │ import * as e from "y";
      │             ^
    2 │ e = 1;
    3 │ 
  
  ℹ Use a local variable instead of reassigning an import.