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Copyright Mathias Bynens <https://mathiasbynens.be/>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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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) [![Dependency status](https://gemnasium.com/mathiasbynens/jsesc.svg)](https://gemnasium.com/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. [Heres an online demo.](https://mothereff.in/js-escapes)
jsescs 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, dont 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))
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 jsescs 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; its 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 enabled (`true`), 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 wont 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 arent strings, arrays, or object
// literals cant be escaped, so theyll 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 arent 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 youre 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 v2.0.0, jsesc supports Node.js v4+ 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.

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#!/usr/bin/env node
(function() {
var fs = require('fs');
var stringEscape = require('../jsesc.js');
var strings = process.argv.splice(2);
var stdin = process.stdin;
var data;
var timeout;
var isObject = false;
var options = {};
var log = console.log;
var main = function() {
var option = strings[0];
if (/^(?:-h|--help|undefined)$/.test(option)) {
log(
'jsesc v%s - https://mths.be/jsesc',
stringEscape.version
);
log([
'\nUsage:\n',
'\tjsesc [string]',
'\tjsesc [-s | --single-quotes] [string]',
'\tjsesc [-d | --double-quotes] [string]',
'\tjsesc [-w | --wrap] [string]',
'\tjsesc [-e | --escape-everything] [string]',
'\tjsesc [-t | --escape-etago] [string]',
'\tjsesc [-6 | --es6] [string]',
'\tjsesc [-l | --lowercase-hex] [string]',
'\tjsesc [-j | --json] [string]',
'\tjsesc [-o | --object] [stringified_object]', // `JSON.parse()` the argument
'\tjsesc [-p | --pretty] [string]', // `compact: false`
'\tjsesc [-v | --version]',
'\tjsesc [-h | --help]',
'\nExamples:\n',
'\tjsesc \'f\xF6o \u2665 b\xE5r \uD834\uDF06 baz\'',
'\tjsesc --json \'f\xF6o \u2665 b\xE5r \uD834\uDF06 baz\'',
'\tjsesc --json --escape-everything \'f\xF6o \u2665 b\xE5r \uD834\uDF06 baz\'',
'\tjsesc --double-quotes --wrap \'f\xF6o \u2665 b\xE5r \uD834\uDF06 baz\'',
'\techo \'f\xF6o \u2665 b\xE5r \uD834\uDF06 baz\' | jsesc'
].join('\n'));
return process.exit(1);
}
if (/^(?:-v|--version)$/.test(option)) {
log('v%s', stringEscape.version);
return process.exit(1);
}
strings.forEach(function(string) {
// Process options
if (/^(?:-s|--single-quotes)$/.test(string)) {
options.quotes = 'single';
return;
}
if (/^(?:-d|--double-quotes)$/.test(string)) {
options.quotes = 'double';
return;
}
if (/^(?:-w|--wrap)$/.test(string)) {
options.wrap = true;
return;
}
if (/^(?:-e|--escape-everything)$/.test(string)) {
options.escapeEverything = true;
return;
}
if (/^(?:-t|--escape-etago)$/.test(string)) {
options.escapeEtago = true;
return;
}
if (/^(?:-6|--es6)$/.test(string)) {
options.es6 = true;
return;
}
if (/^(?:-l|--lowercase-hex)$/.test(string)) {
options.lowercaseHex = true;
return;
}
if (/^(?:-j|--json)$/.test(string)) {
options.json = true;
return;
}
if (/^(?:-o|--object)$/.test(string)) {
isObject = true;
return;
}
if (/^(?:-p|--pretty)$/.test(string)) {
isObject = true;
options.compact = false;
return;
}
// Process string(s)
var result;
try {
if (isObject) {
string = JSON.parse(string);
}
result = stringEscape(string, options);
log(result);
} catch(error) {
log(error.message + '\n');
log('Error: failed to escape.');
log('If you think this is a bug in jsesc, please report it:');
log('https://github.com/mathiasbynens/jsesc/issues/new');
log(
'\nStack trace using jsesc@%s:\n',
stringEscape.version
);
log(error.stack);
return process.exit(1);
}
});
// Return with exit status 0 outside of the `forEach` loop, in case
// multiple strings were passed in.
return process.exit(0);
};
if (stdin.isTTY) {
// handle shell arguments
main();
} else {
// Either the script is called from within a non-TTY context,
// or `stdin` content is being piped in.
if (!process.stdout.isTTY) { // called from a non-TTY context
timeout = setTimeout(function() {
// if no piped data arrived after a while, handle shell arguments
main();
}, 250);
}
data = '';
stdin.on('data', function(chunk) {
clearTimeout(timeout);
data += chunk;
});
stdin.on('end', function() {
strings.push(data.trim());
main();
});
stdin.resume();
}
}());

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'use strict';
const object = {};
const hasOwnProperty = object.hasOwnProperty;
const forOwn = (object, callback) => {
for (const key in object) {
if (hasOwnProperty.call(object, key)) {
callback(key, object[key]);
}
}
};
const extend = (destination, source) => {
if (!source) {
return destination;
}
forOwn(source, (key, value) => {
destination[key] = value;
});
return destination;
};
const forEach = (array, callback) => {
const length = array.length;
let index = -1;
while (++index < length) {
callback(array[index]);
}
};
const toString = object.toString;
const isArray = Array.isArray;
const isBuffer = Buffer.isBuffer;
const isObject = (value) => {
// This is a very simple check, but its good enough for what we need.
return toString.call(value) == '[object Object]';
};
const isString = (value) => {
return typeof value == 'string' ||
toString.call(value) == '[object String]';
};
const isNumber = (value) => {
return typeof value == 'number' ||
toString.call(value) == '[object Number]';
};
const isFunction = (value) => {
return typeof value == 'function';
};
const isMap = (value) => {
return toString.call(value) == '[object Map]';
};
const isSet = (value) => {
return toString.call(value) == '[object Set]';
};
/*--------------------------------------------------------------------------*/
// https://mathiasbynens.be/notes/javascript-escapes#single
const singleEscapes = {
'"': '\\"',
'\'': '\\\'',
'\\': '\\\\',
'\b': '\\b',
'\f': '\\f',
'\n': '\\n',
'\r': '\\r',
'\t': '\\t'
// `\v` is omitted intentionally, because in IE < 9, '\v' == 'v'.
// '\v': '\\x0B'
};
const regexSingleEscape = /["'\\\b\f\n\r\t]/;
const regexDigit = /[0-9]/;
const regexWhitelist = /[ !#-&\(-\[\]-_a-~]/;
const jsesc = (argument, options) => {
const increaseIndentation = () => {
oldIndent = indent;
++options.indentLevel;
indent = options.indent.repeat(options.indentLevel)
};
// Handle options
const defaults = {
'escapeEverything': false,
'minimal': false,
'isScriptContext': false,
'quotes': 'single',
'wrap': false,
'es6': false,
'json': false,
'compact': true,
'lowercaseHex': false,
'numbers': 'decimal',
'indent': '\t',
'indentLevel': 0,
'__inline1__': false,
'__inline2__': false
};
const json = options && options.json;
if (json) {
defaults.quotes = 'double';
defaults.wrap = true;
}
options = extend(defaults, options);
if (
options.quotes != 'single' &&
options.quotes != 'double' &&
options.quotes != 'backtick'
) {
options.quotes = 'single';
}
const quote = options.quotes == 'double' ?
'"' :
(options.quotes == 'backtick' ?
'`' :
'\''
);
const compact = options.compact;
const lowercaseHex = options.lowercaseHex;
let indent = options.indent.repeat(options.indentLevel);
let oldIndent = '';
const inline1 = options.__inline1__;
const inline2 = options.__inline2__;
const newLine = compact ? '' : '\n';
let result;
let isEmpty = true;
const useBinNumbers = options.numbers == 'binary';
const useOctNumbers = options.numbers == 'octal';
const useDecNumbers = options.numbers == 'decimal';
const useHexNumbers = options.numbers == 'hexadecimal';
if (json && argument && isFunction(argument.toJSON)) {
argument = argument.toJSON();
}
if (!isString(argument)) {
if (isMap(argument)) {
if (argument.size == 0) {
return 'new Map()';
}
if (!compact) {
options.__inline1__ = true;
options.__inline2__ = false;
}
return 'new Map(' + jsesc(Array.from(argument), options) + ')';
}
if (isSet(argument)) {
if (argument.size == 0) {
return 'new Set()';
}
return 'new Set(' + jsesc(Array.from(argument), options) + ')';
}
if (isBuffer(argument)) {
if (argument.length == 0) {
return 'Buffer.from([])';
}
return 'Buffer.from(' + jsesc(Array.from(argument), options) + ')';
}
if (isArray(argument)) {
result = [];
options.wrap = true;
if (inline1) {
options.__inline1__ = false;
options.__inline2__ = true;
}
if (!inline2) {
increaseIndentation();
}
forEach(argument, (value) => {
isEmpty = false;
if (inline2) {
options.__inline2__ = false;
}
result.push(
(compact || inline2 ? '' : indent) +
jsesc(value, options)
);
});
if (isEmpty) {
return '[]';
}
if (inline2) {
return '[' + result.join(', ') + ']';
}
return '[' + newLine + result.join(',' + newLine) + newLine +
(compact ? '' : oldIndent) + ']';
} else if (isNumber(argument)) {
if (json) {
// Some number values (e.g. `Infinity`) cannot be represented in JSON.
return JSON.stringify(argument);
}
if (useDecNumbers) {
return String(argument);
}
if (useHexNumbers) {
let hexadecimal = argument.toString(16);
if (!lowercaseHex) {
hexadecimal = hexadecimal.toUpperCase();
}
return '0x' + hexadecimal;
}
if (useBinNumbers) {
return '0b' + argument.toString(2);
}
if (useOctNumbers) {
return '0o' + argument.toString(8);
}
} else if (!isObject(argument)) {
if (json) {
// For some values (e.g. `undefined`, `function` objects),
// `JSON.stringify(value)` returns `undefined` (which isnt valid
// JSON) instead of `'null'`.
return JSON.stringify(argument) || 'null';
}
return String(argument);
} else { // its an object
result = [];
options.wrap = true;
increaseIndentation();
forOwn(argument, (key, value) => {
isEmpty = false;
result.push(
(compact ? '' : indent) +
jsesc(key, options) + ':' +
(compact ? '' : ' ') +
jsesc(value, options)
);
});
if (isEmpty) {
return '{}';
}
return '{' + newLine + result.join(',' + newLine) + newLine +
(compact ? '' : oldIndent) + '}';
}
}
const string = argument;
// Loop over each code unit in the string and escape it
let index = -1;
const length = string.length;
result = '';
while (++index < length) {
const character = string.charAt(index);
if (options.es6) {
const first = string.charCodeAt(index);
if ( // check if its the start of a surrogate pair
first >= 0xD800 && first <= 0xDBFF && // high surrogate
length > index + 1 // there is a next code unit
) {
const second = string.charCodeAt(index + 1);
if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate
// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
const codePoint = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
let hexadecimal = codePoint.toString(16);
if (!lowercaseHex) {
hexadecimal = hexadecimal.toUpperCase();
}
result += '\\u{' + hexadecimal + '}';
++index;
continue;
}
}
}
if (!options.escapeEverything) {
if (regexWhitelist.test(character)) {
// Its a printable ASCII character that is not `"`, `'` or `\`,
// so dont escape it.
result += character;
continue;
}
if (character == '"') {
result += quote == character ? '\\"' : character;
continue;
}
if (character == '`') {
result += quote == character ? '\\`' : character;
continue;
}
if (character == '\'') {
result += quote == character ? '\\\'' : character;
continue;
}
}
if (
character == '\0' &&
!json &&
!regexDigit.test(string.charAt(index + 1))
) {
result += '\\0';
continue;
}
if (regexSingleEscape.test(character)) {
// no need for a `hasOwnProperty` check here
result += singleEscapes[character];
continue;
}
const charCode = character.charCodeAt(0);
if (options.minimal && charCode != 0x2028 && charCode != 0x2029) {
result += character;
continue;
}
let hexadecimal = charCode.toString(16);
if (!lowercaseHex) {
hexadecimal = hexadecimal.toUpperCase();
}
const longhand = hexadecimal.length > 2 || json;
const escaped = '\\' + (longhand ? 'u' : 'x') +
('0000' + hexadecimal).slice(longhand ? -4 : -2);
result += escaped;
continue;
}
if (options.wrap) {
result = quote + result + quote;
}
if (quote == '`') {
result = result.replace(/\$\{/g, '\\\$\{');
}
if (options.isScriptContext) {
// https://mathiasbynens.be/notes/etago
return result
.replace(/<\/(script|style)/gi, '<\\/$1')
.replace(/<!--/g, json ? '\\u003C!--' : '\\x3C!--');
}
return result;
};
jsesc.version = '2.5.2';
module.exports = jsesc;

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.Dd May 13, 2016
.Dt jsesc 1
.Sh NAME
.Nm jsesc
.Nd escape strings for use in JavaScript string literals
.Sh SYNOPSIS
.Nm
.Op Fl s | -single-quotes Ar string
.br
.Op Fl d | -double-quotes Ar string
.br
.Op Fl w | -wrap Ar string
.br
.Op Fl e | -escape-everything Ar string
.br
.Op Fl 6 | -es6 Ar string
.br
.Op Fl l | -lowercase-hex Ar string
.br
.Op Fl j | -json Ar string
.br
.Op Fl p | -object Ar string
.br
.Op Fl p | -pretty Ar string
.br
.Op Fl v | -version
.br
.Op Fl h | -help
.Sh DESCRIPTION
.Nm
escapes strings for use in JavaScript string literals while generating the shortest possible valid ASCII-only output.
.Sh OPTIONS
.Bl -ohang -offset
.It Sy "-s, --single-quotes"
Escape any occurrences of ' in the input string as \\', so that the output can be used in a JavaScript string literal wrapped in single quotes.
.It Sy "-d, --double-quotes"
Escape any occurrences of " in the input string as \\", so that the output can be used in a JavaScript string literal wrapped in double quotes.
.It Sy "-w, --wrap"
Make sure the output is a valid JavaScript string literal wrapped in quotes. The type of quotes can be specified using the
.Ar -s | --single-quotes
or
.Ar -d | --double-quotes
settings.
.It Sy "-6, --es6"
Escape any astral Unicode symbols using ECMAScript 6 Unicode code point escape sequences.
.It Sy "-e, --escape-everything"
Escape all the symbols in the output, even printable ASCII symbols.
.It Sy "-j, --json"
Make sure the output is valid JSON. Hexadecimal character escape sequences and the \\v or \\0 escape sequences will not be used. Setting this flag enables the
.Ar -d | --double-quotes
and
.Ar -w | --wrap
settings.
.It Sy "-o, --object"
Treat the input as a JavaScript object rather than a string. Accepted values are flat arrays containing only string values, and flat objects containing only string values.
.It Sy "-p, --pretty"
Pretty-print the output for objects, using whitespace to make it more readable. Setting this flag enables the
.It Sy "-l, --lowercase-hex"
Use lowercase for alphabetical hexadecimal digits in escape sequences.
.Ar -o | --object
setting.
.It Sy "-v, --version"
Print jsesc's version.
.It Sy "-h, --help"
Show the help screen.
.El
.Sh EXIT STATUS
The
.Nm jsesc
utility exits with one of the following values:
.Pp
.Bl -tag -width flag -compact
.It Li 0
.Nm
successfully escaped the given string and printed the result.
.It Li 1
.Nm
wasn't instructed to escape anything (for example, the
.Ar --help
flag was set); or, an error occurred.
.El
.Sh EXAMPLES
.Bl -ohang -offset
.It Sy "jsesc 'foo bar baz'"
Print an escaped version of the given string.
.It Sy echo\ 'foo bar baz'\ |\ jsesc
Print an escaped version of the string that gets piped in.
.El
.Sh BUGS
jsesc's bug tracker is located at <https://github.com/mathiasbynens/jsesc/issues>.
.Sh AUTHOR
Mathias Bynens <https://mathiasbynens.be/>
.Sh WWW
<https://mths.be/jsesc>

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{
"name": "jsesc",
"version": "2.5.2",
"description": "Given some data, jsesc returns the shortest possible stringified & ASCII-safe representation of that data.",
"homepage": "https://mths.be/jsesc",
"engines": {
"node": ">=4"
},
"main": "jsesc.js",
"bin": "bin/jsesc",
"man": "man/jsesc.1",
"keywords": [
"buffer",
"escape",
"javascript",
"json",
"map",
"set",
"string",
"stringify",
"tool"
],
"license": "MIT",
"author": {
"name": "Mathias Bynens",
"url": "https://mathiasbynens.be/"
},
"repository": {
"type": "git",
"url": "https://github.com/mathiasbynens/jsesc.git"
},
"bugs": "https://github.com/mathiasbynens/jsesc/issues",
"files": [
"LICENSE-MIT.txt",
"jsesc.js",
"bin/",
"man/"
],
"scripts": {
"build": "grunt template",
"coveralls": "istanbul cover --verbose --dir 'coverage' 'tests/tests.js' && coveralls < coverage/lcov.info'",
"cover": "istanbul cover --report 'html' --verbose --dir 'coverage' 'tests/tests.js'",
"test": "mocha tests"
},
"devDependencies": {
"coveralls": "^2.11.6",
"grunt": "^0.4.5",
"grunt-template": "^0.2.3",
"istanbul": "^0.4.2",
"mocha": "*",
"regenerate": "^1.3.0",
"requirejs": "^2.1.22"
}
,"_resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.2.tgz"
,"_integrity": "sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA=="
,"_from": "jsesc@2.5.2"
}