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📄 deprecation-warnings.ts

📊 Analysis Summary

Metric	Count
🔧 Functions	1
📦 Imports	1
📊 Variables & Constants	3

📚 Table of Contents

• Imports
• Variables & Constants
• Functions

🛠️ File Location:

📂 packages/rule-tester/src/utils/deprecation-warnings.ts

📦 Imports

Name	Source
path	node:path

---

Variables & Constants

Name	Type	Kind	Value	Exported
deprecationWarningMessages	{ readonly ESLINT_LEGACY_ECMAFEATURES: "The 'ecmaFeatures' config file property is deprecated and has no effect."; }	const	`{
ESLINT_LEGACY_ECMAFEATURES:
"The 'ecmaFeatures' config file property is deprecated and has no effect.",
} as const`	✗
sourceFileErrorCache	Set<string>	const	new Set<string>()	✗
message	"The 'ecmaFeatures' config file property is deprecated and has no effect."	const	deprecationWarningMessages[errorCode]	✗

---

Functions

emitDeprecationWarning(source: string, errorCode: keyof typeof deprecationWarningMessages): void

Code

export function emitDeprecationWarning(
  source: string,
  errorCode: keyof typeof deprecationWarningMessages,
): void {
  const cacheKey = JSON.stringify({ errorCode, source });

  if (sourceFileErrorCache.has(cacheKey)) {
    return;
  }

  sourceFileErrorCache.add(cacheKey);

  const rel = path.relative(process.cwd(), source);
  const message = deprecationWarningMessages[errorCode];

  process.emitWarning(
    `${message} (found in "${rel}")`,
    'DeprecationWarning',
    errorCode,
  );
}

• JSDoc:

  /**
   * Emits a deprecation warning containing a given filepath. A new deprecation warning is emitted
   * for each unique file path, but repeated invocations with the same file path have no effect.
   * No warnings are emitted if the `--no-deprecation` or `--no-warnings` Node runtime flags are active.
   * @param source The name of the configuration source to report the warning for.
   * @param errorCode The warning message to show.
   */
  

• Parameters:

• source: string
• errorCode: keyof typeof deprecationWarningMessages
• Return Type: void
• Calls:
• JSON.stringify
• sourceFileErrorCache.has
• sourceFileErrorCache.add
• path.relative
• process.cwd
• process.emitWarning

---