All files / src/internal/client/dev equality.js

82.07% Statements 87/106
56.25% Branches 9/16
71.42% Functions 5/7
81.73% Lines 85/104

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 1052x 2x 2x 2x 4x 4x 4x 4x 4x 4x     4x 4x 4x 4x 655737x 655737x 655737x 317741x 317741x 317741x     317741x 655737x 655737x 4x 4x 4x 40020x 40020x 40020x 40020x 40020x 6x 6x 6x 6x 6x 6x 6x 6x 6x     6x 40020x 40020x 4x 4x 4x 672025x 672025x 672025x 599046x 599046x 599046x     599046x 672025x 672025x 4x 4x 4x 4x       4x 4x 2x 2x 2x 2x 2x 2x 2x 2x 102x 102x 102x 102x     102x 102x 102x 102x 2x 2x 2x 2x 2x 2x 2x 2x              
import * as w from '../warnings.js';
import { get_proxied_value } from '../proxy.js';
 
export function init_array_prototype_warnings() {
	const array_prototype = Array.prototype;
	// The REPL ends up here over and over, and this prevents it from adding more and more patches
	// of the same kind to the prototype, which would slow down everything over time.
	// @ts-expect-error
	const cleanup = Array.__svelte_cleanup;
	if (cleanup) {
		cleanup();
	}
 
	const { indexOf, lastIndexOf, includes } = array_prototype;
 
	array_prototype.indexOf = function (item, from_index) {
		const index = indexOf.call(this, item, from_index);
 
		if (index === -1) {
			const test = indexOf.call(get_proxied_value(this), get_proxied_value(item), from_index);
 
			if (test !== -1) {
				w.state_proxy_equality_mismatch('array.indexOf(...)');
			}
		}
 
		return index;
	};
 
	array_prototype.lastIndexOf = function (item, from_index) {
		// we need to specify this.length - 1 because it's probably using something like
		// `arguments` inside so passing undefined is different from not passing anything
		const index = lastIndexOf.call(this, item, from_index ?? this.length - 1);
 
		if (index === -1) {
			// we need to specify this.length - 1 because it's probably using something like
			// `arguments` inside so passing undefined is different from not passing anything
			const test = lastIndexOf.call(
				get_proxied_value(this),
				get_proxied_value(item),
				from_index ?? this.length - 1
			);
 
			if (test !== -1) {
				w.state_proxy_equality_mismatch('array.lastIndexOf(...)');
			}
		}
 
		return index;
	};
 
	array_prototype.includes = function (item, from_index) {
		const has = includes.call(this, item, from_index);
 
		if (!has) {
			const test = includes.call(get_proxied_value(this), get_proxied_value(item), from_index);
 
			if (test) {
				w.state_proxy_equality_mismatch('array.includes(...)');
			}
		}
 
		return has;
	};
 
	// @ts-expect-error
	Array.__svelte_cleanup = () => {
		array_prototype.indexOf = indexOf;
		array_prototype.lastIndexOf = lastIndexOf;
		array_prototype.includes = includes;
	};
}
 
/**
 * @param {any} a
 * @param {any} b
 * @param {boolean} equal
 * @returns {boolean}
 */
export function strict_equals(a, b, equal = true) {
	// try-catch needed because this tries to read properties of `a` and `b`,
	// which could be disallowed for example in a secure context
	try {
		if ((a === b) !== (get_proxied_value(a) === get_proxied_value(b))) {
			w.state_proxy_equality_mismatch(equal ? '===' : '!==');
		}
	} catch {}
 
	return (a === b) === equal;
}
 
/**
 * @param {any} a
 * @param {any} b
 * @param {boolean} equal
 * @returns {boolean}
 */
export function equals(a, b, equal = true) {
	if ((a == b) !== (get_proxied_value(a) == get_proxied_value(b))) {
		w.state_proxy_equality_mismatch(equal ? '==' : '!=');
	}

	return (a == b) === equal;
}