Moondust

Handcrafted theme for those who have not found syntax highlighting useful for themself.

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Source code of uvu

by Luke Edwards

import { dequal } from 'dequal';
import { compare, lines } from 'uvu/diff';

function dedent(str) {
	str = str.replace(/\r?\n/g, '\n');
  let arr = str.match(/^[ \t]*(?=\S)/gm);
  let i = 0, min = 1/0, len = (arr||[]).length;
  for (; i < len; i++) min = Math.min(min, arr[i].length);
  return len && min ? str.replace(new RegExp(`^[ \\t]{${min}}`, 'gm'), '') : str;
}

export class Assertion extends Error {
	constructor(opts={}) {
		super(opts.message);
		this.name = 'Assertion';
		this.code = 'ERR_ASSERTION';
		if (Error.captureStackTrace) {
			Error.captureStackTrace(this, this.constructor);
		}
		this.details = opts.details || false;
		this.generated = !!opts.generated;
		this.operator = opts.operator;
		this.expects = opts.expects;
		this.actual = opts.actual;
	}
}

function assert(bool, actual, expects, operator, detailer, backup, msg) {
	if (bool) return;
	let message = msg || backup;
	if (msg instanceof Error) throw msg;
	let details = detailer && detailer(actual, expects);
	throw new Assertion({ actual, expects, operator, message, details, generated: !msg });
}

export function ok(val, msg) {
	assert(!!val, false, true, 'ok', false, 'Expected value to be truthy', msg);
}

export function is(val, exp, msg) {
	assert(val === exp, val, exp, 'is', compare, 'Expected values to be strictly equal:', msg);
}

export function equal(val, exp, msg) {
	assert(dequal(val, exp), val, exp, 'equal', compare, 'Expected values to be deeply equal:', msg);
}

export function unreachable(msg) {
	assert(false, true, false, 'unreachable', false, 'Expected not to be reached!', msg);
}

export function type(val, exp, msg) {
	let tmp = typeof val;
	assert(tmp === exp, tmp, exp, 'type', false, `Expected "${tmp}" to be "${exp}"`, msg);
}

export function instance(val, exp, msg) {
	let name = '`' + (exp.name || exp.constructor.name) + '`';
	assert(val instanceof exp, val, exp, 'instance', false, `Expected value to be an instance of ${name}`, msg);
}

export function match(val, exp, msg) {
	if (typeof exp === 'string') {
		assert(val.includes(exp), val, exp, 'match', false, `Expected value to include "${exp}" substring`, msg);
	} else {
		assert(exp.test(val), val, exp, 'match', false, `Expected value to match \`${String(exp)}\` pattern`, msg);
	}
}

export function snapshot(val, exp, msg) {
	val=dedent(val); exp=dedent(exp);
	assert(val === exp, val, exp, 'snapshot', lines, 'Expected value to match snapshot:', msg);
}

const lineNums = (x, y) => lines(x, y, 1);
export function fixture(val, exp, msg) {
	val=dedent(val); exp=dedent(exp);
	assert(val === exp, val, exp, 'fixture', lineNums, 'Expected value to match fixture:', msg);
}

export function throws(blk, exp, msg) {
	if (!msg && typeof exp === 'string') {
		msg = exp; exp = null;
	}

	try {
		blk();
		assert(false, false, true, 'throws', false, 'Expected function to throw', msg);
	} catch (err) {
		if (err instanceof Assertion) throw err;

		if (typeof exp === 'function') {
			assert(exp(err), false, true, 'throws', false, 'Expected function to throw matching exception', msg);
		} else if (exp instanceof RegExp) {
			assert(exp.test(err.message), false, true, 'throws', false, `Expected function to throw exception matching \`${String(exp)}\` pattern`, msg);
		}
	}
}

// ---

export function not(val, msg) {
	assert(!val, true, false, 'not', false, 'Expected value to be falsey', msg);
}

not.ok = not;

is.not = function (val, exp, msg) {
	assert(val !== exp, val, exp, 'is.not', false, 'Expected values not to be strictly equal', msg);
}

not.equal = function (val, exp, msg) {
	assert(!dequal(val, exp), val, exp, 'not.equal', false, 'Expected values not to be deeply equal', msg);
}

not.type = function (val, exp, msg) {
	let tmp = typeof val;
	assert(tmp !== exp, tmp, exp, 'not.type', false, `Expected "${tmp}" not to be "${exp}"`, msg);
}

not.instance = function (val, exp, msg) {
	let name = '`' + (exp.name || exp.constructor.name) + '`';
	assert(!(val instanceof exp), val, exp, 'not.instance', false, `Expected value not to be an instance of ${name}`, msg);
}

not.snapshot = function (val, exp, msg) {
	val=dedent(val); exp=dedent(exp);
	assert(val !== exp, val, exp, 'not.snapshot', false, 'Expected value not to match snapshot', msg);
}

not.fixture = function (val, exp, msg) {
	val=dedent(val); exp=dedent(exp);
	assert(val !== exp, val, exp, 'not.fixture', false, 'Expected value not to match fixture', msg);
}

not.match = function (val, exp, msg) {
	if (typeof exp === 'string') {
		assert(!val.includes(exp), val, exp, 'not.match', false, `Expected value not to include "${exp}" substring`, msg);
	} else {
		assert(!exp.test(val), val, exp, 'not.match', false, `Expected value not to match \`${String(exp)}\` pattern`, msg);
	}
}

not.throws = function (blk, exp, msg) {
	if (!msg && typeof exp === 'string') {
		msg = exp; exp = null;
	}

	try {
		blk();
	} catch (err) {
		if (typeof exp === 'function') {
			assert(!exp(err), true, false, 'not.throws', false, 'Expected function not to throw matching exception', msg);
		} else if (exp instanceof RegExp) {
			assert(!exp.test(err.message), true, false, 'not.throws', false, `Expected function not to throw exception matching \`${String(exp)}\` pattern`, msg);
		} else if (!exp) {
			assert(false, true, false, 'not.throws', false, 'Expected function not to throw', msg);
		}
	}
}
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Early on in my programming journey, syntax highlighting aided my understanding the coding. However, as I gained more experience, I found myself relying less on it. Eventually, I realized that the abundance of colors was very straining on my eyes and made it difficult to focus and concentrate.

Moondust is crafted to reduce eye strain, allowing to focus on code. It challenges the conventional approach of highlighting keywords and typical structures. Instead of drawing excessive attention to them, this theme brings business logic to the forefront.

For a more in-depth discussion on the issues associated with the conventional approach to syntax highlighting, recommend reading the articles A case against syntax highlighting and Syntax highlighting is a waste of an information channel.

Moondust is tailored for each syntax individually. At present, it supports CSS, Dockerfile, fish, Go, Go Module, Go Sum, HTML, INI, JavaScript, JSON, JSON with Comments, JSON Lines, JSX, Makefile, Python, Ruby, Rust, Shell Script, SQL, Swift, TOML, TypeScript, TSX, and YAML.

In the initial phase, Moondust was primarily a modification of the GitHub Theme. I owe a great deal of gratitude to the Primer team for their work.

A special shout-out goes to the entire community that focuses on creating minimalistic, two-color, monochrome themes, particularly Monochrome. It was a delight for me to delve into your work, and it is heartening to realize that our aesthetic preferences align closely.