How to use the deprecate function from util

util.md?plain=1

GitHub: BridgeAR/node

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such a way that it is marked as deprecated.

```js
const util = require('util');

exports.obsoleteFunction = util.deprecate(() => {
  // Do something here.
}, 'obsoleteFunction() is deprecated. Use newShinyFunction() instead.');
```

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+ 5 other calls in file

argparse.js

GitHub: yarrajhansirani/MY-RESTAURANT

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function _alias(object, from, to) {
    try {
        let name = object.constructor.name
        Object.defineProperty(object, from, {
            value: util.deprecate(object[to], sub('%s.%s() is renamed to %s.%s()',
                name, from, name, to)),
            enumerable: false
        })
    } catch {}

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+ 15 other calls in file

node.js

GitHub: Jimmyblakemore/Terminal-Messaging

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 */


var fd = parseInt(process.env.DEBUG_FD, 10) || 2;


if (1 !== fd && 2 !== fd) {
  util.deprecate(function(){}, 'except for stderr(2) and stdout(1), any other usage of DEBUG_FD is deprecated. Override debug.log if you want to use a different log function (https://git.io/debug_fd)')()
}


var stream = 1 === fd ? process.stdout :
             2 === fd ? process.stderr :

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index.js

GitHub: lcf262412/examples

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      throw new Error('Unknown state: ' + this.state)
    }
  }
}


Cursor.prototype.end = util.deprecate(
  Cursor.prototype.end,
  'Cursor.end is deprecated. Call end on the client itself to end a connection to the database.'
)

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test-util-deprecate-invalid-code.js

GitHub: vladimir-andreevich/node.js-14-windows-7

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const common = require('../common');
const assert = require('assert');
const util = require('util');


[1, true, false, null, {}].forEach((notString) => {
  assert.throws(() => util.deprecate(() => {}, 'message', notString), {
    code: 'ERR_INVALID_ARG_TYPE',
    name: 'TypeError',
    message: 'The "code" argument must be of type string.' +
             common.invalidArgTypeHelper(notString)

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test-util-deprecate.js

GitHub: vladimir-andreevich/node.js-14-windows-7

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+ 5 other calls in file

deprecated.js

GitHub: vladimir-andreevich/node.js-14-windows-7

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}, 'this function is deprecated');


deprecated();

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deprecated-userland-subclass.js

GitHub: vladimir-andreevich/node.js-14-windows-7

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const assert = require('assert');


class deprecatedClass {
}


const deprecated = util.deprecate(deprecatedClass, 'deprecatedClass is deprecated.');


class subclass extends deprecated {
  constructor() {
    super();

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util.js

GitHub: hankh-dev/nodejs-book-3rd-test

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