noPlaywrightEval

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JavaScript (and super languages)

Summary

Rule available since: v2.4.2
Diagnostic Category: lint/nursery/noPlaywrightEval
This rule doesn’t have a fix.
The default severity of this rule is information.
This rule belongs to the following domains:
- playwright
Sources:
- Same as playwright/no-eval

How to configure

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{
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  "linter": {
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    "rules": {
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      "nursery": {
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        "noPlaywrightEval": "error"
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      }
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    }
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  }
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}

Description

Disallow usage of page.$eval() and page.$$eval().

These methods are discouraged in favor of locator.evaluate() and locator.evaluateAll(). Locator-based evaluation is more reliable and follows Playwright’s recommended patterns.

Examples

Invalid

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await page.$eval('.foo', el => el.textContent);

code-block.js:1:7 lint/nursery/noPlaywrightEval ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Unexpected use of page.$eval().
  
  > 1 │ await page.$eval(‘.foo’, el => el.textContent);
      │       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Locator-based evaluation is more reliable and follows Playwright’s recommended patterns.
  
  ℹ Use locator.evaluate() instead.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.

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const texts = await page.$$eval('.foo', els => els.map(el => el.textContent));

code-block.js:1:21 lint/nursery/noPlaywrightEval ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Unexpected use of page.$$eval().
  
  > 1 │ const texts = await page.$$eval(‘.foo’, els => els.map(el => el.textContent));
      │                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Locator-based evaluation is more reliable and follows Playwright’s recommended patterns.
  
  ℹ Use locator.evaluateAll() instead.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.

Valid

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const text = await page.locator('.foo').evaluate(el => el.textContent);

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const texts = await page.locator('.foo').evaluateAll(els => els.map(el => el.textContent));