scancss

scancss

A robust CSS stylesheet statistics collector and analyzer

Table of contents

• Installation

• Usage

• Report Structure

• Examples

• Options

  • size
  • comments
  • atRules
  • rules
  • selectors
  • selectorsUsage
  • selectorComplexityThreshold
  • specificityGraph
  • declarations
  • uniqueDeclarationsList
  • properties
  • engineTriggerProperties
  • performanceHacks
  • displays
  • positions
  • zIndices
  • floats
  • borderRadiuses
  • widths
  • heights
  • letterSpacings
  • fonts
  • colors
  • backgroundColors
  • allColors
  • transitionsAndAnimations
  • functions
  • filters
  • gradients
  • units
  • variables
  • dataUris
  • browserHacks

• License

Installation

npm install scancss --save

yarn add scancss --save

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Usage

import scancss from 'scancss';
// or const scancss = require('scancss');

const stylesheet = `
	.selector {
		display: inline-block;
		position: relative;
		width: 40px;
		height: 40px;
		background-color: #123123;
		color: #fff;
	}

	@media screen and (max-width: 480px) {
		.selector {
			width: 20px;
			height: 20px;
			background-color: #456456;
			color: #000;
		}
	}
`;

// Switching off some metrics
const report = scancss(
	stylesheet,
	{
		atRules: false,
		selectorsUsage: false,
		dataUris: false,
	}
);

NOTE: Without provided options object scancss will use defaults. See available Options.

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Report Structure

See Report Structure for more details.

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Examples

See examples folder with stylesheets and their corresponding reports.

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Options

size

Use this flag to fill .size metric

• Default: true

comments

Use this flag to fill .comments metric

• Default: true

atRules

Use this flag to fill .atRules, .mediaQueries, .keyframes, .imports metrics

• NOTE: Disabling this flag you will disable counting browser hacks in @supports and @media at-rules

• Default: true

rules

Use this flag to fill .rules and .selectors metrics

• NOTE: Disabling this flag you will disable counting all .selectors metrics

• Default: true

selectors

Use this flag to fill .selectors metric

• NOTE: Disabling this flag you will disable counting all .selectors metrics

• Default: true

selectorsUsage

Use this flag to fill .selectors.usage metric

• Default: true

attributesUsage

Use this flag to fill .selectors.attributesUsage metric

• Default: true

selectorComplexityThreshold

Use this value to set a threshold of the base parts of a selector to consider the selector as complex and to count in .selectors.complex metric

• Default: 4

specificityGraph

Use this flag to fill .selectors.specificity.graphData metric

• Default: false

declarations

Use this flag to fill .declarations metric

• NOTE: Disabling this flag you will disable counting all .declarations metrics

• Default: true

uniqueDeclarationsList

Use this flag to fill .declarations.list metric

• Default: false

properties

Use this flag to fill .properties metric

• NOTE: Disabling this flag you will disable counting .properties.engineTriggers and .properties.performanceHacks

• Default: true

engineTriggerProperties

Use this flag to fill .properties.engineTriggers metric

• Default: true

performanceHacks

Use this flag to fill .properties.performanceHacks metric

• Default: true

displays

Use this flag to fill .displays metric

• Default: true

positions

Use this flag to fill .positions metric

• Default: true

zIndices

Use this flag to fill .zIndices metric

• Default: true

floats

Use this flag to fill .floats metric

• Default: true

borderRadiuses

Use this flag to fill .borderRadiuses metric

• Default: true

widths

Use this flag to fill .widths metric

• Default: true

heights

Use this flag to fill .heights metric

• Default: true

letterSpacings

Use this flag to fill .letterSpacings metric

• Default: true

fonts

Use this flag to fill .fontSizes, .lineHeights, .fontFamilies metrics

• Default: true

colors

Use this flag to fill .colors metric

• Default: true

backgroundColors

Use this flag to fill .backgroundColors metric

• Default: true

allColors

Use this flag to fill .allColors metric

• Default: true

transitionsAndAnimations

Use this flag to fill .transitions and .animations metrics

• Default: true

functions

Use this flag to fill .functions metric

• NOTE: Disabling this flag you will disable counting .gradients, .filters, .dataUris, cubic-beziers for .transitions and .animations metrics

• Default: true

filters

Use this flag to fill .filters metric

gradients

Use this flag to fill .gradients metric

• Default: true

units

Use this flag to fill .units metric

• NOTE: Disabling this flag you will disable counting .properties.negativeMargins metric

• Default: true

variables

Use this flag to fill .variables metric

• Default: true

dataUris

Use this flag to fill .dataUris metric

• Default: true

browserHacks

Use this flag to fill .browserHacks metric

• Default: true

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License

MIT © Alex Orekhov @everget

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