67 lines
1.9 KiB
Markdown
67 lines
1.9 KiB
Markdown
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# string-width
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> Get the visual width of a string - the number of columns required to display it
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Some Unicode characters are [fullwidth](https://en.wikipedia.org/wiki/Halfwidth_and_fullwidth_forms) and use double the normal width. [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code) are stripped and doesn't affect the width.
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Useful to be able to measure the actual width of command-line output.
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## Install
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```sh
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npm install string-width
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```
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## Usage
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```js
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import stringWidth from 'string-width';
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stringWidth('a');
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//=> 1
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stringWidth('古');
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//=> 2
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stringWidth('\u001B[1m古\u001B[22m');
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//=> 2
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```
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## API
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### stringWidth(string, options?)
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#### string
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Type: `string`
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The string to be counted.
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#### options
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Type: `object`
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##### ambiguousIsNarrow
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Type: `boolean`\
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Default: `true`
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Count [ambiguous width characters](https://www.unicode.org/reports/tr11/#Ambiguous) as having narrow width (count of 1) instead of wide width (count of 2).
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> Ambiguous characters behave like wide or narrow characters depending on the context (language tag, script identification, associated font, source of data, or explicit markup; all can provide the context). **If the context cannot be established reliably, they should be treated as narrow characters by default.**
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> - http://www.unicode.org/reports/tr11/
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##### countAnsiEscapeCodes
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Type: `boolean`\
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Default: `false`
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Whether [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code) should be counted.
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## Related
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- [string-width-cli](https://github.com/sindresorhus/string-width-cli) - CLI for this module
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- [string-length](https://github.com/sindresorhus/string-length) - Get the real length of a string
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- [widest-line](https://github.com/sindresorhus/widest-line) - Get the visual width of the widest line in a string
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- [get-east-asian-width](https://github.com/sindresorhus/get-east-asian-width) - Determine the East Asian Width of a Unicode character
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