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Name	Size	Last Modified
[F]ajv.js Edit	993 bytes	2022-10-02 10:07:42
[F]ast-utils.js Edit	910 bytes	2022-10-02 10:07:49
[F]config-validator.js Edit	11.32 KB	2022-10-02 10:07:54
[F]deprecation-warnings.js Edit	1.89 KB	2022-10-02 10:07:55
[F]logging.js Edit	538 bytes	2022-10-02 10:08:00
[F]relative-module-resolver.js Edit	1.73 KB	2022-10-02 10:08:05
[F]runtime-info.js Edit	5.42 KB	2022-10-02 10:08:05
[F]string-utils.js Edit	459 bytes	2022-10-02 10:08:05
[F]traverser.js Edit	5.35 KB	2022-10-02 10:08:06
[F]types.js Edit	9.65 KB	2022-10-02 10:08:06

Editing: deprecation-warnings.js

/**
 * @fileoverview Provide the function that emits deprecation warnings.
 * @author Toru Nagashima <http://github.com/mysticatea>
 */
"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const path = require("path");

//------------------------------------------------------------------------------
// Private
//------------------------------------------------------------------------------

// Definitions for deprecation warnings.
const deprecationWarningMessages = {
    ESLINT_LEGACY_ECMAFEATURES:
        "The 'ecmaFeatures' config file property is deprecated and has no effect."
};

const sourceFileErrorCache = new Set();

/**
 * 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 {string} source The name of the configuration source to report the warning for.
 * @param {string} errorCode The warning message to show.
 * @returns {void}
 */
function emitDeprecationWarning(source, errorCode) {
    const cacheKey = JSON.stringify({ source, errorCode });

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
    );
}

//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------

module.exports = {
    emitDeprecationWarning
};

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