break-styled-lines

This package is useful for when you want to know where linebreaks will occur in text given a font style (e.g. 16pt italic Georgia) and the width of its container.

This utility also supports some more complex use-cases:

- Adding linebreaks to a list of strings as though they were a single string, and returning the text back as arrays.
- Adding linebreaks to a body of text which does not have consistent styling throughout (e.g. one much larger word in the middle of a sentence).

Uses the Canvas API to measure text, so it's quite fast. Uses an OffscreenCanvas if the browser supports it.

Comes with typescript types.

Basic example

``ts
import breakLines from "break-styled-lines";

const textWithLineBreaks = breakLines(
"Good day to you my friends! What ails you on this day?",
100,
"bold 12pt arial"
);
`

The result of the above usage would be:

`
/*
Good day to
you my
friends!
What ails
you on this
day?
*/
`

Installation

yarn add break-styled-lines

Usage

The single breakLines export supports three different cases:

$3

`ts
breakLines(
// The text you'd like to insert newlines into
text: string
// The width constraining the text
width: number
// The font style of the text (a value of the CSS font property e.g. 10px bold serif)
style: string
): string | string[]
`

`ts
breakLines("Good morrow my good man!", 100, "16pt serif");
`

$3

`ts
breakLines(
// An array of strings, which will be treated as a single run of text, and then split back apart again before being returned.
text: string[]
// The width constraining the text
width: number
// The font style of the text (a value of the CSS font property e.g. 10px bold serif)
style: string
): string | string[]
`

``ts
breakLines(["Good morrow my good man!", " What brings you to our corner of the world?"], 100, "16pt serif")
`ts

$3

`ts
breakLines(
// An array of descriptors, which will be treated as a single run of text, and then split back apart again before being returned.
// { text: string, font?: string }
text: TextDescriptor[]
// The width constraining the text
width: number
// The default font style of the text which will be used if the descriptor is not provided one (a value of the CSS font property e.g. 10px bold serif)
style: string
): string | string[]
``

`ts
breakLines(
[
{ text: "Good morrow my good man!" },
{ text: " What brings you to our corner of the world?" },
{
text: " Our selection of the finest smoked cheeses, you say?!",
font: "36pt bold Impact",
},
],
100,
"16pt serif"
);
``