PostCSS Todo or Die

npm install @csstools/postcss-todo-or-die --save-dev

PostCSS Todo or Die lets you write TODOs in CSS that ensure you actually do them.

Based on todo-or-die in rust and todo-or-die in ruby

The intention is to get a clear signal when a TODO can be resolved. The clearest signal is a hard error. It forces you to stop and resolve the issue.

@todo-or-die rules are considered open TODOs while they are true. Once they become false they will throw an exception.

.baz {
	/* "hwb" is fully supported */
	@todo-or-die browserslist("chrome < 101, safari < 15, firefox < 96");
	color: pink;
	color: hwb(350 75% 0%);

	/* do something after a date */
	@todo-or-die before-date(3000 01 01);
	content: "2000";
}

/* You can also wrap large chunks of CSS */
@todo-or-die if(20 > 16) {
	.baz {
		color: green;
	}
}

/* becomes */

.baz {
	/* "hwb" is fully supported */
	color: pink;
	color: hwb(350 75% 0%);

	/* do something after a date */
	content: "2000";
}

/* You can also wrap large chunks of CSS */
.baz {
		color: green;
	}

Usage

Add PostCSS Todo or Die to your project:

npm install postcss @csstools/postcss-todo-or-die --save-dev

Use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssTodoOrDie = require('@csstools/postcss-todo-or-die');

postcss([
	postcssTodoOrDie(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);

Syntax

PostCSS Todo or Die is non-standard and is not part of any official CSS Specification.

@todo-or-die rule

The @todo-or-die rule is used to indicate which parts of your CSS have a TODO. You can either use a lone rule or a block around CSS.

.foo {
	@todo-or-die if(10 > 8);
	color: pink;
}

@todo-or-die if(10 > 8) {
	.foo {
		color: pink;
	}
}

You can use these conditions :

| condition | todo | dies | | --- | --- | --- | | if | when true or unknown | when false | | not | when false or unknown | when true | | before-date | when "now" is before the date | when "now" is after | | browserslist | when browsers match those of your project | when no browsers match |

@todo-or-die if(10 > 8);
@todo-or-die not(10 < 8);
@todo-or-die before-date(2006 01 31); /* year month day */
@todo-or-die browserslist("chrome <= 80");

You can combine this plugin with others like @csstools/postcss-design-tokens :

@todo-or-die if(10 > design-token('foo.bar'));

@todo-or-die if(<value> <operator> <value>);
@todo-or-die not(<value> <operator> <value>);
@todo-or-die before-date(<integer> <integer> <integer>);
@todo-or-die browserslist(<string>);

<operator> = [ '<' | '>' | '=' ]