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index.js
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index.js
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const plugin = require("tailwindcss/plugin");
// Mostly pinched from https://css-tricks.com/linearly-scale-font-size-with-css-clamp-based-on-the-viewport/
const clampedFonts = (options = {}) => {
// optional Custom class name for utility
const utilityClassName = options.utilityClassName || 'text'
const pxToEms = (value) => {
// if px / 16
const num = parseInt(value, 10);
const unit = value.replace(/[0-9]/g, "");
return unit === "px" ? num / options.rootFontPx : num;
};
const scale = {
min: options.fontScaleMin,
max: options.fontScaleMax,
};
const vp = {
min: options.viewportStart,
max: options.viewportEnd,
};
const fontSizes = [
"base",
"lg",
"xl",
"2xl",
"3xl",
"4xl",
"5xl",
"6xl",
"7xl",
"8xl",
"9xl",
];
const leading = {
"xxs": 1.75,
"xs": 1.75,
"sm": 1.75,
"base": 1.75,
"lg": 1.75,
"xl": 1.5,
"2xl": 1.35,
"3xl": 1.35,
"4xl": 1.35,
"5xl": 1.25,
"6xl": 1.25,
"7xl": 1.25,
"8xl": 1.25,
"9xl": 1.25
}
const fontSizesSmall = ["sm", "xs", "xxs"];
const largeFonts = Object.assign(
...fontSizes.map((key, i) => {
// set min and max font sizes using font scale
const fs = {
min: scale.min ** i,
max: scale.max ** (i + 1),
};
// set viewport widths in rem for clamping. e.g min font size will be @ 25rem screen with and max font size @ 85rem
const slope = (fs.max - fs.min) / (pxToEms(vp.max) - pxToEms(vp.min));
const yAxisIntersection = -pxToEms(vp.min) * slope + fs.min;
return {
[`.${utilityClassName}-${key}`]: {
"font-size": `clamp(${fs.min}rem , ${yAxisIntersection}rem + ${
slope * 100
}vw, ${fs.max}rem)`,
"line-height": `${leading[key]}`
},
};
})
);
const smallFonts = Object.assign(
...fontSizesSmall.map((key, i) => {
const fs = {
min: 1 / scale.min ** (i + 1),
max: 1 / scale.max ** i,
};
const slope = (fs.max - fs.min) / (pxToEms(vp.max) - pxToEms(vp.min));
const yAxisIntersection = `${-pxToEms(vp.min) * slope + fs.min}`; // make this unit
return {
[`.${utilityClassName}-${key}`]: {
"font-size": `clamp(${fs.min}rem , ${yAxisIntersection}rem + ${
slope * 100
}vw, ${fs.max}rem)`,
"line-height": `${leading[key]}`
},
};
})
);
return {
...smallFonts,
...largeFonts,
};
};
module.exports = plugin.withOptions(function (options = {}) {
return function ({ addUtilities, theme }) {
/**
* USAGE: takes parameters
* - rootFontPx: Int
- font size in px of the html element - default 16
* - fontScaleMin: Int
- minimum font size in rem - default 1.25
* - fontScaleMax: Int
- maximum font size in rem - default 1.414,
* - screenStart: String
- Tailwind theme.screen size for starting point of slope - default "sm"
* - screenEnd: String
- Tailwind theme.screen size for end point of slope - default "2xl"
* - viewportStart: String
- manually set starting point of slope in px or rem, this has priority over screenStart - default null
* - viewportEnd: String
- manually set end point of slope in px or rem, this has priority over screenStart - default null
*/
const screens = theme("screens");
const defaultOptions = {
rootFontPx: 16,
fontScaleMin: 1.25,
fontScaleMax: 1.414,
};
options = {
...defaultOptions,
...options,
viewportStart: options.viewportStart
? options.viewportStart
: screens[options.screenStart] || screens.sm,
viewportEnd: options.viewportEnd
? options.viewportEnd
: screens[options.screenEnd] || screens["2xl"],
};
addUtilities({
...clampedFonts({ ...options }),
});
};
});