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util: add MIME utilities (#21128)
Co-authored-by: Rich Trott <[email protected]> Co-authored-by: Antoine du Hamel <[email protected]> PR-URL: #21128 Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Robert Nagy <[email protected]> Reviewed-By: Jacob Smith <[email protected]> Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: James M Snell <[email protected]>
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‎doc/api/errors.md‎

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An IP address is not valid.
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<a id="ERR_INVALID_MIME_SYNTAX"></a>
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### `ERR_INVALID_MIME_SYNTAX`
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The syntax of a MIME is not valid.
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<a id="ERR_INVALID_MODULE"></a>
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### `ERR_INVALID_MODULE`

‎doc/api/util.md‎

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See [`assert.deepStrictEqual()`][] for more information about deep strict
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equality.
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## Class: `util.MIMEType`
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<!-- YAML
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added: REPLACEME
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-->
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> Stability: 1 - Experimental
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An implementation of [the MIMEType class](https://bmeck.github.io/node-proposal-mime-api/).
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In accordance with browser conventions, all properties of `MIMEType` objects
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are implemented as getters and setters on the class prototype, rather than as
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data properties on the object itself.
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A MIME string is a structured string containing multiple meaningful
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components. When parsed, a `MIMEType` object is returned containing
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properties for each of these components.
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### Constructor: `new MIMEType(input)`
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* `input` {string} The input MIME to parse
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Creates a new `MIMEType` object by parsing the `input`.
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```mjs
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import { MIMEType } from 'node:util';
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const myMIME = new MIMEType('text/plain');
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```
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```cjs
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const { MIMEType } = require('node:util');
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const myMIME = new MIMEType('text/plain');
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```
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A `TypeError` will be thrown if the `input` is not a valid MIME. Note
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that an effort will be made to coerce the given values into strings. For
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instance:
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```mjs
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import { MIMEType } from 'node:util';
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const myMIME = new MIMEType({ toString: () => 'text/plain' });
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console.log(String(myMIME));
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// Prints: text/plain
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```
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```cjs
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const { MIMEType } = require('node:util');
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const myMIME = new MIMEType({ toString: () => 'text/plain' });
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console.log(String(myMIME));
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// Prints: text/plain
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```
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#### `mime.type`
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* {string}
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Gets and sets the type portion of the MIME.
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```mjs
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import { MIMEType } from 'node:util';
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const myMIME = new MIMEType('text/javascript');
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console.log(myMIME.type);
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// Prints: text
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myMIME.type = 'application';
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console.log(myMIME.type);
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// Prints: application
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console.log(String(myMIME));
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// Prints: application/javascript
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```
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```cjs
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const { MIMEType } = require('node:util');
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const myMIME = new MIMEType('text/javascript');
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console.log(myMIME.type);
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// Prints: text
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myMIME.type = 'application';
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console.log(myMIME.type);
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// Prints: application
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console.log(String(myMIME));
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// Prints: application/javascript/javascript
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```
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#### `mime.subtype`
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* {string}
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Gets and sets the subtype portion of the MIME.
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```mjs
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import { MIMEType } from 'node:util';
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const myMIME = new MIMEType('text/ecmascript');
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console.log(myMIME.subtype);
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// Prints: ecmascript
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myMIME.subtype = 'javascript';
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console.log(myMIME.subtype);
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// Prints: javascript
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console.log(String(myMIME));
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// Prints: text/javascript
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```
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```cjs
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const { MIMEType } = require('node:util');
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const myMIME = new MIMEType('text/ecmascript');
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console.log(myMIME.subtype);
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// Prints: ecmascript
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myMIME.subtype = 'javascript';
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console.log(myMIME.subtype);
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// Prints: javascript
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console.log(String(myMIME));
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// Prints: text/javascript
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```
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#### `mime.essence`
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* {string}
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Gets the essence of the MIME. This property is read only.
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Use `mime.type` or `mime.subtype` to alter the MIME.
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```mjs
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import { MIMEType } from 'node:util';
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const myMIME = new MIMEType('text/javascript;key=value');
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console.log(myMIME.essence);
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// Prints: text/javascript
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myMIME.type = 'application';
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console.log(myMIME.essence);
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// Prints: application/javascript
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console.log(String(myMIME));
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// Prints: application/javascript;key=value
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```
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```cjs
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const { MIMEType } = require('node:util');
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const myMIME = new MIMEType('text/javascript;key=value');
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console.log(myMIME.essence);
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// Prints: text/javascript
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myMIME.type = 'application';
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console.log(myMIME.essence);
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// Prints: application/javascript
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console.log(String(myMIME));
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// Prints: application/javascript;key=value
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```
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#### `mime.params`
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* {MIMEParams}
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Gets the [`MIMEParams`][] object representing the
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parameters of the MIME. This property is read-only. See
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[`MIMEParams`][] documentation for details.
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#### `mime.toString()`
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* Returns: {string}
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The `toString()` method on the `MIMEType` object returns the serialized MIME.
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Because of the need for standard compliance, this method does not allow users
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to customize the serialization process of the MIME.
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#### `mime.toJSON()`
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* Returns: {string}
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Alias for [`mime.toString()`][].
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This method is automatically called when an `MIMEType` object is serialized
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with [`JSON.stringify()`][].
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```mjs
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import { MIMEType } from 'node:util';
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const myMIMES = [
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new MIMEType('image/png'),
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new MIMEType('image/gif'),
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];
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console.log(JSON.stringify(myMIMES));
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// Prints: ["image/png", "image/gif"]
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```
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```cjs
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const { MIMEType } = require('node:util');
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const myMIMES = [
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new MIMEType('image/png'),
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new MIMEType('image/gif'),
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];
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console.log(JSON.stringify(myMIMES));
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// Prints: ["image/png", "image/gif"]
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```
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### Class: `util.MIMEParams`
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<!-- YAML
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added: REPLACEME
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-->
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The `MIMEParams` API provides read and write access to the parameters of a
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`MIMEType`.
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#### Constructor: `new MIMEParams()`
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Creates a new `MIMEParams` object by with empty parameters
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```mjs
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import { MIMEParams } from 'node:util';
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const myParams = new MIMEParams();
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```
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```cjs
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const { MIMEParams } = require('node:util');
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const myParams = new MIMEParams();
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```
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#### `mimeParams.delete(name)`
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* `name` {string}
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Remove all name-value pairs whose name is `name`.
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#### `mimeParams.entries()`
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* Returns: {Iterator}
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Returns an iterator over each of the name-value pairs in the parameters.
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Each item of the iterator is a JavaScript `Array`. The first item of the array
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is the `name`, the second item of the array is the `value`.
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#### `mimeParams.get(name)`
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* `name` {string}
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* Returns: {string} or `null` if there is no name-value pair with the given
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`name`.
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Returns the value of the first name-value pair whose name is `name`. If there
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are no such pairs, `null` is returned.
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#### `mimeParams.has(name)`
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* `name` {string}
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* Returns: {boolean}
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Returns `true` if there is at least one name-value pair whose name is `name`.
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#### `mimeParams.keys()`
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* Returns: {Iterator}
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Returns an iterator over the names of each name-value pair.
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```mjs
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import { MIMEType } from 'node:util';
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const { params } = new MIMEType('text/plain;foo=0;bar=1');
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for (const name of params.keys()) {
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console.log(name);
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}
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// Prints:
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// foo
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// bar
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```
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```cjs
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const { MIMEType } = require('node:util');
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const { params } = new MIMEType('text/plain;foo=0;bar=1');
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for (const name of params.keys()) {
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console.log(name);
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}
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// Prints:
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// foo
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// bar
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```
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#### `mimeParams.set(name, value)`
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* `name` {string}
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* `value` {string}
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Sets the value in the `MIMEParams` object associated with `name` to
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`value`. If there are any pre-existing name-value pairs whose names are `name`,
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set the first such pair's value to `value`.
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```mjs
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import { MIMEType } from 'node:util';
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const { params } = new MIMEType('text/plain;foo=0;bar=1');
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params.set('foo', 'def');
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params.set('baz', 'xyz');
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console.log(params.toString());
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// Prints: foo=def&bar=1&baz=xyz
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```
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```cjs
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const { MIMEType } = require('node:util');
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const { params } = new MIMEType('text/plain;foo=0;bar=1');
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params.set('foo', 'def');
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params.set('baz', 'xyz');
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console.log(params.toString());
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// Prints: foo=def&bar=1&baz=xyz
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```
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#### `mimeParams.values()`
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* Returns: {Iterator}
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Returns an iterator over the values of each name-value pair.
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#### `mimeParams[@@iterator]()`
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* Returns: {Iterator}
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Alias for [`mimeParams.entries()`][].
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```mjs
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import { MIMEType } from 'node:util';
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const { params } = new MIMEType('text/plain;foo=bar;xyz=baz');
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for (const [name, value] of params) {
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console.log(name, value);
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}
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// Prints:
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// foo bar
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// xyz baz
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```
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```cjs
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const { MIMEType } = require('node:util');
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const { params } = new MIMEType('text/plain;foo=bar;xyz=baz');
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for (const [name, value] of params) {
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console.log(name, value);
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}
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// Prints:
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// foo bar
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// xyz baz
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```
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## `util.parseArgs([config])`
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<!-- YAML
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[`Int16Array`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int16Array
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[`Int32Array`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int32Array
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[`Int8Array`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int8Array
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[`JSON.stringify()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
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[`MIMEparams`]: #class-utilmimeparams
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[`Map`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
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[`Object.assign()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
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[`Object.freeze()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
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[`WebAssembly.Module`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module
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[`assert.deepStrictEqual()`]: assert.md#assertdeepstrictequalactual-expected-message
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[`console.error()`]: console.md#consoleerrordata-args
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[`mime.toString()`]: #mimetostring
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[`mimeParams.entries()`]: #mimeparamsentries
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[`napi_create_external()`]: n-api.md#napi_create_external
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[`target` and `handler`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy#Terminology
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[`tty.hasColors()`]: tty.md#writestreamhascolorscount-env

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