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-# jsesc [![Build status](https://travis-ci.org/mathiasbynens/jsesc.svg?branch=master)](https://travis-ci.org/mathiasbynens/jsesc) [![Code coverage status](https://coveralls.io/repos/mathiasbynens/jsesc/badge.svg)](https://coveralls.io/r/mathiasbynens/jsesc)
-
-Given some data, _jsesc_ returns a stringified representation of that data. jsesc is similar to `JSON.stringify()` except:
-
-1. it outputs JavaScript instead of JSON [by default](#json), enabling support for data structures like ES6 maps and sets;
-2. it offers [many options](#api) to customize the output;
-3. its output is ASCII-safe [by default](#minimal), thanks to its use of [escape sequences](https://mathiasbynens.be/notes/javascript-escapes) where needed.
-
-For any input, jsesc generates the shortest possible valid printable-ASCII-only output. [Here’s an online demo.](https://mothereff.in/js-escapes)
-
-jsesc’s output can be used instead of `JSON.stringify`’s to avoid [mojibake](https://en.wikipedia.org/wiki/Mojibake) and other encoding issues, or even to [avoid errors](https://twitter.com/annevk/status/380000829643571200) when passing JSON-formatted data (which may contain U+2028 LINE SEPARATOR, U+2029 PARAGRAPH SEPARATOR, or [lone surrogates](https://esdiscuss.org/topic/code-points-vs-unicode-scalar-values#content-14)) to a JavaScript parser or an UTF-8 encoder.
-
-## Installation
-
-Via [npm](https://www.npmjs.com/):
-
-```bash
-npm install jsesc
-```
-
-In [Node.js](https://nodejs.org/):
-
-```js
-const jsesc = require('jsesc');
-```
-
-## API
-
-### `jsesc(value, options)`
-
-This function takes a value and returns an escaped version of the value where any characters that are not printable ASCII symbols are escaped using the shortest possible (but valid) [escape sequences for use in JavaScript strings](https://mathiasbynens.be/notes/javascript-escapes). The first supported value type is strings:
-
-```js
-jsesc('Ich ♥ Bücher');
-// → 'Ich \\u2665 B\\xFCcher'
-
-jsesc('foo 𝌆 bar');
-// → 'foo \\uD834\\uDF06 bar'
-```
-
-Instead of a string, the `value` can also be an array, an object, a map, a set, or a buffer. In such cases, `jsesc` returns a stringified version of the value where any characters that are not printable ASCII symbols are escaped in the same way.
-
-```js
-// Escaping an array
-jsesc([
-  'Ich ♥ Bücher', 'foo 𝌆 bar'
-]);
-// → '[\'Ich \\u2665 B\\xFCcher\',\'foo \\uD834\\uDF06 bar\']'
-
-// Escaping an object
-jsesc({
-  'Ich ♥ Bücher': 'foo 𝌆 bar'
-});
-// → '{\'Ich \\u2665 B\\xFCcher\':\'foo \\uD834\\uDF06 bar\'}'
-```
-
-The optional `options` argument accepts an object with the following options:
-
-#### `quotes`
-
-The default value for the `quotes` option is `'single'`. This means that any occurrences of `'` in the input string are escaped as `\'`, so that the output can be used in a string literal wrapped in single quotes.
-
-```js
-jsesc('`Lorem` ipsum "dolor" sit \'amet\' etc.');
-// → 'Lorem ipsum "dolor" sit \\\'amet\\\' etc.'
-
-jsesc('`Lorem` ipsum "dolor" sit \'amet\' etc.', {
-  'quotes': 'single'
-});
-// → '`Lorem` ipsum "dolor" sit \\\'amet\\\' etc.'
-// → "`Lorem` ipsum \"dolor\" sit \\'amet\\' etc."
-```
-
-If you want to use the output as part of a string literal wrapped in double quotes, set the `quotes` option to `'double'`.
-
-```js
-jsesc('`Lorem` ipsum "dolor" sit \'amet\' etc.', {
-  'quotes': 'double'
-});
-// → '`Lorem` ipsum \\"dolor\\" sit \'amet\' etc.'
-// → "`Lorem` ipsum \\\"dolor\\\" sit 'amet' etc."
-```
-
-If you want to use the output as part of a template literal (i.e. wrapped in backticks), set the `quotes` option to `'backtick'`.
-
-```js
-jsesc('`Lorem` ipsum "dolor" sit \'amet\' etc.', {
-  'quotes': 'backtick'
-});
-// → '\\`Lorem\\` ipsum "dolor" sit \'amet\' etc.'
-// → "\\`Lorem\\` ipsum \"dolor\" sit 'amet' etc."
-// → `\\\`Lorem\\\` ipsum "dolor" sit 'amet' etc.`
-```
-
-This setting also affects the output for arrays and objects:
-
-```js
-jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, {
-  'quotes': 'double'
-});
-// → '{"Ich \\u2665 B\\xFCcher":"foo \\uD834\\uDF06 bar"}'
-
-jsesc([ 'Ich ♥ Bücher', 'foo 𝌆 bar' ], {
-  'quotes': 'double'
-});
-// → '["Ich \\u2665 B\\xFCcher","foo \\uD834\\uDF06 bar"]'
-```
-
-#### `numbers`
-
-The default value for the `numbers` option is `'decimal'`. This means that any numeric values are represented using decimal integer literals. Other valid options are `binary`, `octal`, and `hexadecimal`, which result in binary integer literals, octal integer literals, and hexadecimal integer literals, respectively.
-
-```js
-jsesc(42, {
-  'numbers': 'binary'
-});
-// → '0b101010'
-
-jsesc(42, {
-  'numbers': 'octal'
-});
-// → '0o52'
-
-jsesc(42, {
-  'numbers': 'decimal'
-});
-// → '42'
-
-jsesc(42, {
-  'numbers': 'hexadecimal'
-});
-// → '0x2A'
-```
-
-#### `wrap`
-
-The `wrap` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, the output is a valid JavaScript string literal wrapped in quotes. The type of quotes can be specified through the `quotes` setting.
-
-```js
-jsesc('Lorem ipsum "dolor" sit \'amet\' etc.', {
-  'quotes': 'single',
-  'wrap': true
-});
-// → '\'Lorem ipsum "dolor" sit \\\'amet\\\' etc.\''
-// → "\'Lorem ipsum \"dolor\" sit \\\'amet\\\' etc.\'"
-
-jsesc('Lorem ipsum "dolor" sit \'amet\' etc.', {
-  'quotes': 'double',
-  'wrap': true
-});
-// → '"Lorem ipsum \\"dolor\\" sit \'amet\' etc."'
-// → "\"Lorem ipsum \\\"dolor\\\" sit \'amet\' etc.\""
-```
-
-#### `es6`
-
-The `es6` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, any astral Unicode symbols in the input are escaped using [ECMAScript 6 Unicode code point escape sequences](https://mathiasbynens.be/notes/javascript-escapes#unicode-code-point) instead of using separate escape sequences for each surrogate half. If backwards compatibility with ES5 environments is a concern, don’t enable this setting. If the `json` setting is enabled, the value for the `es6` setting is ignored (as if it was `false`).
-
-```js
-// By default, the `es6` option is disabled:
-jsesc('foo 𝌆 bar 💩 baz');
-// → 'foo \\uD834\\uDF06 bar \\uD83D\\uDCA9 baz'
-
-// To explicitly disable it:
-jsesc('foo 𝌆 bar 💩 baz', {
-  'es6': false
-});
-// → 'foo \\uD834\\uDF06 bar \\uD83D\\uDCA9 baz'
-
-// To enable it:
-jsesc('foo 𝌆 bar 💩 baz', {
-  'es6': true
-});
-// → 'foo \\u{1D306} bar \\u{1F4A9} baz'
-```
-
-#### `escapeEverything`
-
-The `escapeEverything` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, all the symbols in the output are escaped — even printable ASCII symbols.
-
-```js
-jsesc('lolwat"foo\'bar', {
-  'escapeEverything': true
-});
-// → '\\x6C\\x6F\\x6C\\x77\\x61\\x74\\"\\x66\\x6F\\x6F\\\'\\x62\\x61\\x72'
-// → "\\x6C\\x6F\\x6C\\x77\\x61\\x74\\\"\\x66\\x6F\\x6F\\'\\x62\\x61\\x72"
-```
-
-This setting also affects the output for string literals within arrays and objects.
-
-#### `minimal`
-
-The `minimal` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, only a limited set of symbols in the output are escaped:
-
-* U+0000 `\0`
-* U+0008 `\b`
-* U+0009 `\t`
-* U+000A `\n`
-* U+000C `\f`
-* U+000D `\r`
-* U+005C `\\`
-* U+2028 `\u2028`
-* U+2029 `\u2029`
-* whatever symbol is being used for wrapping string literals (based on [the `quotes` option](#quotes))
-* [lone surrogates](https://esdiscuss.org/topic/code-points-vs-unicode-scalar-values#content-14)
-
-Note: with this option enabled, jsesc output is no longer guaranteed to be ASCII-safe.
-
-```js
-jsesc('foo\u2029bar\nbaz©qux𝌆flops', {
-  'minimal': false
-});
-// → 'foo\\u2029bar\\nbaz©qux𝌆flops'
-```
-
-#### `isScriptContext`
-
-The `isScriptContext` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, occurrences of [`</script` and `</style`](https://mathiasbynens.be/notes/etago) in the output are escaped as `<\/script` and `<\/style`, and [`<!--`](https://mathiasbynens.be/notes/etago#comment-8) is escaped as `\x3C!--` (or `\u003C!--` when the `json` option is enabled). This setting is useful when jsesc’s output ends up as part of a `<script>` or `<style>` element in an HTML document.
-
-```js
-jsesc('foo</script>bar', {
-  'isScriptContext': true
-});
-// → 'foo<\\/script>bar'
-```
-
-#### `compact`
-
-The `compact` option takes a boolean value (`true` or `false`), and defaults to `true` (enabled). When enabled, the output for arrays and objects is as compact as possible; it’s not formatted nicely.
-
-```js
-jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, {
-  'compact': true // this is the default
-});
-// → '{\'Ich \u2665 B\xFCcher\':\'foo \uD834\uDF06 bar\'}'
-
-jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, {
-  'compact': false
-});
-// → '{\n\t\'Ich \u2665 B\xFCcher\': \'foo \uD834\uDF06 bar\'\n}'
-
-jsesc([ 'Ich ♥ Bücher', 'foo 𝌆 bar' ], {
-  'compact': false
-});
-// → '[\n\t\'Ich \u2665 B\xFCcher\',\n\t\'foo \uD834\uDF06 bar\'\n]'
-```
-
-This setting has no effect on the output for strings.
-
-#### `indent`
-
-The `indent` option takes a string value, and defaults to `'\t'`. When the `compact` setting is disabled (`false`), the value of the `indent` option is used to format the output for arrays and objects.
-
-```js
-jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, {
-  'compact': false,
-  'indent': '\t' // this is the default
-});
-// → '{\n\t\'Ich \u2665 B\xFCcher\': \'foo \uD834\uDF06 bar\'\n}'
-
-jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, {
-  'compact': false,
-  'indent': '  '
-});
-// → '{\n  \'Ich \u2665 B\xFCcher\': \'foo \uD834\uDF06 bar\'\n}'
-
-jsesc([ 'Ich ♥ Bücher', 'foo 𝌆 bar' ], {
-  'compact': false,
-  'indent': '  '
-});
-// → '[\n  \'Ich \u2665 B\xFCcher\',\n\  t\'foo \uD834\uDF06 bar\'\n]'
-```
-
-This setting has no effect on the output for strings.
-
-#### `indentLevel`
-
-The `indentLevel` option takes a numeric value, and defaults to `0`. It represents the current indentation level, i.e. the number of times the value of [the `indent` option](#indent) is repeated.
-
-```js
-jsesc(['a', 'b', 'c'], {
-  'compact': false,
-  'indentLevel': 1
-});
-// → '[\n\t\t\'a\',\n\t\t\'b\',\n\t\t\'c\'\n\t]'
-
-jsesc(['a', 'b', 'c'], {
-  'compact': false,
-  'indentLevel': 2
-});
-// → '[\n\t\t\t\'a\',\n\t\t\t\'b\',\n\t\t\t\'c\'\n\t\t]'
-```
-
-#### `json`
-
-The `json` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, the output is valid JSON. [Hexadecimal character escape sequences](https://mathiasbynens.be/notes/javascript-escapes#hexadecimal) and [the `\v` or `\0` escape sequences](https://mathiasbynens.be/notes/javascript-escapes#single) are not used. Setting `json: true` implies `quotes: 'double', wrap: true, es6: false`, although these values can still be overridden if needed — but in such cases, the output won’t be valid JSON anymore.
-
-```js
-jsesc('foo\x00bar\xFF\uFFFDbaz', {
-  'json': true
-});
-// → '"foo\\u0000bar\\u00FF\\uFFFDbaz"'
-
-jsesc({ 'foo\x00bar\xFF\uFFFDbaz': 'foo\x00bar\xFF\uFFFDbaz' }, {
-  'json': true
-});
-// → '{"foo\\u0000bar\\u00FF\\uFFFDbaz":"foo\\u0000bar\\u00FF\\uFFFDbaz"}'
-
-jsesc([ 'foo\x00bar\xFF\uFFFDbaz', 'foo\x00bar\xFF\uFFFDbaz' ], {
-  'json': true
-});
-// → '["foo\\u0000bar\\u00FF\\uFFFDbaz","foo\\u0000bar\\u00FF\\uFFFDbaz"]'
-
-// Values that are acceptable in JSON but aren’t strings, arrays, or object
-// literals can’t be escaped, so they’ll just be preserved:
-jsesc([ 'foo\x00bar', [1, '©', { 'foo': true, 'qux': null }], 42 ], {
-  'json': true
-});
-// → '["foo\\u0000bar",[1,"\\u00A9",{"foo":true,"qux":null}],42]'
-// Values that aren’t allowed in JSON are run through `JSON.stringify()`:
-jsesc([ undefined, -Infinity ], {
-  'json': true
-});
-// → '[null,null]'
-```
-
-**Note:** Using this option on objects or arrays that contain non-string values relies on `JSON.stringify()`. For legacy environments like IE ≤ 7, use [a `JSON` polyfill](http://bestiejs.github.io/json3/).
-
-#### `lowercaseHex`
-
-The `lowercaseHex` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, any alphabetical hexadecimal digits in escape sequences as well as any hexadecimal integer literals (see [the `numbers` option](#numbers)) in the output are in lowercase.
-
-```js
-jsesc('Ich ♥ Bücher', {
-  'lowercaseHex': true
-});
-// → 'Ich \\u2665 B\\xfccher'
-//                    ^^
-
-jsesc(42, {
-  'numbers': 'hexadecimal',
-  'lowercaseHex': true
-});
-// → '0x2a'
-//      ^^
-```
-
-### `jsesc.version`
-
-A string representing the semantic version number.
-
-### Using the `jsesc` binary
-
-To use the `jsesc` binary in your shell, simply install jsesc globally using npm:
-
-```bash
-npm install -g jsesc
-```
-
-After that you’re able to escape strings from the command line:
-
-```bash
-$ jsesc 'föo ♥ bår 𝌆 baz'
-f\xF6o \u2665 b\xE5r \uD834\uDF06 baz
-```
-
-To escape arrays or objects containing string values, use the `-o`/`--object` option:
-
-```bash
-$ jsesc --object '{ "föo": "♥", "bår": "𝌆 baz" }'
-{'f\xF6o':'\u2665','b\xE5r':'\uD834\uDF06 baz'}
-```
-
-To prettify the output in such cases, use the `-p`/`--pretty` option:
-
-```bash
-$ jsesc --pretty '{ "föo": "♥", "bår": "𝌆 baz" }'
-{
-  'f\xF6o': '\u2665',
-  'b\xE5r': '\uD834\uDF06 baz'
-}
-```
-
-For valid JSON output, use the `-j`/`--json` option:
-
-```bash
-$ jsesc --json --pretty '{ "föo": "♥", "bår": "𝌆 baz" }'
-{
-  "f\u00F6o": "\u2665",
-  "b\u00E5r": "\uD834\uDF06 baz"
-}
-```
-
-Read a local JSON file, escape any non-ASCII symbols, and save the result to a new file:
-
-```bash
-$ jsesc --json --object < data-raw.json > data-escaped.json
-```
-
-Or do the same with an online JSON file:
-
-```bash
-$ curl -sL "http://git.io/aorKgQ" | jsesc --json --object > data-escaped.json
-```
-
-See `jsesc --help` for the full list of options.
-
-## Support
-
-As of v3.0.0, jsesc supports Node.js v6+ only.
-
-Older versions (up to jsesc v1.3.0) support Chrome 27, Firefox 3, Safari 4, Opera 10, IE 6, Node.js v6.0.0, Narwhal 0.3.2, RingoJS 0.8-0.11, PhantomJS 1.9.0, and Rhino 1.7RC4. **Note:** Using the `json` option on objects or arrays that contain non-string values relies on `JSON.parse()`. For legacy environments like IE ≤ 7, use [a `JSON` polyfill](https://bestiejs.github.io/json3/).
-
-## Author
-
-| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |
-|---|
-| [Mathias Bynens](https://mathiasbynens.be/) |
-
-## License
-
-This library is available under the [MIT](https://mths.be/mit) license.