This repo shows the limitation of postcss-tailwind and stencil.
To use tailwind with that setup we have to import all those tailwind variable like so in every component css file.
@import 'tailwindcss/base';
@import 'tailwindcss/components';
@import 'tailwindcss/utilities';
This causes a bunch of default tailwind styles to be added in the component bundled js file. Like so :
const myComponentCss = "*,::before,::after{box-sizing:border-box;border-width:0;border-style:solid;border-color:#e5e7eb;}::before,::after{--tw-content:''}html,:host{line-height:1.5;-webkit-text-size-adjust:100%;-moz-tab-size:4;tab-size:4;font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-feature-settings:normal;font-variation-settings:normal;-webkit-tap-highlight-color:transparent;}body{margin:0;line-height:inherit;}hr{height:0;color:inherit;border-top-width:1px;}abbr:where([title]){text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, \"Liberation Mono\", \"Courier New\", monospace;font-feature-settings:normal;font-variation-settings:normal;font-size:1em;}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-0.25em}sup{top:-0.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse;}button,input,optgroup,select,textarea{font-family:inherit;font-feature-settings:inherit;font-variation-settings:inherit;font-size:100%;font-weight:inherit;line-height:inherit;letter-spacing:inherit;color:inherit;margin:0;padding:0;}button,select{text-transform:none}button,input:where([type='button']),input:where([type='reset']),input:where([type='submit']){-webkit-appearance:button;background-color:transparent;background-image:none;}:-moz-focusring{outline:auto}:-moz-ui-invalid{box-shadow:none}progress{vertical-align:baseline}::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}[type='search']{-webkit-appearance:textfield;outline-offset:-2px;}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit;}summary{display:list-item}blockquote,dl,dd,h1,h2,h3,h4,h5,h6,hr,figure,p,pre{margin:0}fieldset{margin:0;padding:0}legend{padding:0}ol,ul,menu{list-style:none;margin:0;padding:0}dialog{padding:0}textarea{resize:vertical}input::placeholder,textarea::placeholder{opacity:1;color:#9ca3af;}button,[role=\"button\"]{cursor:pointer}:disabled{cursor:default}img,svg,video,canvas,audio,iframe,embed,object{display:block;vertical-align:middle;}img,video{max-width:100%;height:auto}[hidden]{display:none}*,::before,::after{--tw-border-spacing-x:0;--tw-border-spacing-y:0;--tw-translate-x:0;--tw-translate-y:0;--tw-rotate:0;--tw-skew-x:0;--tw-skew-y:0;--tw-scale-x:1;--tw-scale-y:1;--tw-scroll-snap-strictness:proximity;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-color:rgb(59 130 246 / 0.5);--tw-ring-offset-shadow:0 0 #0000;--tw-ring-shadow:0 0 #0000;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;}::backdrop{--tw-border-spacing-x:0;--tw-border-spacing-y:0;--tw-translate-x:0;--tw-translate-y:0;--tw-rotate:0;--tw-skew-x:0;--tw-skew-y:0;--tw-scale-x:1;--tw-scale-y:1;--tw-scroll-snap-strictness:proximity;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-color:rgb(59 130 246 / 0.5);--tw-ring-offset-shadow:0 0 #0000;--tw-ring-shadow:0 0 #0000;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;}";
This css can range from 4kb minimally to over 50kb depending on the tailwind class used.
I tried those tools :
- nanocss, this could help improve the bundle size but does not fix that issue.
- purge, this broke @coveo/atomic but could also improve a bit the bundle size. It does not fix the issue above.
- https://www.npmjs.com/package/stencil-tailwind-plugin , this tool just makes it easier to setup postcss and tailwind, it uses the same tools and has the same issue.
