svelte/test/js/samples/dev-warning-missing-data-computed/expected-bundle.js

function noop() {}

function assign(tar, src) {
	for (var k in src) tar[k] = src[k];
	return tar;
}

function addLoc(element, file, line, column, char) {
	element.__svelte_meta = {
		loc: { file, line, column, char }
	};
}

function append(target, node) {
	target.appendChild(node);
}

function insert(target, node, anchor) {
	target.insertBefore(node, anchor);
}

function detachNode(node) {
	node.parentNode.removeChild(node);
}

function createElement(name) {
	return document.createElement(name);
}

function createText(data) {
	return document.createTextNode(data);
}

function setData(text, data) {
	text.data = '' + data;
}

function blankObject() {
	return Object.create(null);
}

function destroy(detach) {
	this.destroy = noop;
	this.fire('destroy');
	this.set = noop;

	this._fragment.d(detach !== false);
	this._fragment = null;
	this._state = {};
}

function destroyDev(detach) {
	destroy.call(this, detach);
	this.destroy = function() {
		console.warn('Component was already destroyed');
	};
}

function _differs(a, b) {
	return a != a ? b == b : a !== b || ((a && typeof a === 'object') || typeof a === 'function');
}

function fire(eventName, data) {
	var handlers =
		eventName in this._handlers && this._handlers[eventName].slice();
	if (!handlers) return;

	for (var i = 0; i < handlers.length; i += 1) {
		var handler = handlers[i];

		if (!handler.__calling) {
			try {
				handler.__calling = true;
				handler.call(this, data);
			} finally {
				handler.__calling = false;
			}
		}
	}
}

function flush(component) {
	component._lock = true;
	callAll(component._beforecreate);
	callAll(component._oncreate);
	callAll(component._aftercreate);
	component._lock = false;
}

function get() {
	return this._state;
}

function init(component, options) {
	component._handlers = blankObject();
	component._slots = blankObject();
	component._bind = options._bind;
	component._staged = {};

	component.options = options;
	component.root = options.root || component;
	component.store = options.store || component.root.store;

	if (!options.root) {
		component._beforecreate = [];
		component._oncreate = [];
		component._aftercreate = [];
	}
}

function on(eventName, handler) {
	var handlers = this._handlers[eventName] || (this._handlers[eventName] = []);
	handlers.push(handler);

	return {
		cancel: function() {
			var index = handlers.indexOf(handler);
			if (~index) handlers.splice(index, 1);
		}
	};
}

function set(newState) {
	this._set(assign({}, newState));
	if (this.root._lock) return;
	flush(this.root);
}

function _set(newState) {
	var oldState = this._state,
		changed = {},
		dirty = false;

	newState = assign(this._staged, newState);
	this._staged = {};

	for (var key in newState) {
		if (this._differs(newState[key], oldState[key])) changed[key] = dirty = true;
	}
	if (!dirty) return;

	this._state = assign(assign({}, oldState), newState);
	this._recompute(changed, this._state);
	if (this._bind) this._bind(changed, this._state);

	if (this._fragment) {
		this.fire("state", { changed: changed, current: this._state, previous: oldState });
		this._fragment.p(changed, this._state);
		this.fire("update", { changed: changed, current: this._state, previous: oldState });
	}
}

function _stage(newState) {
	assign(this._staged, newState);
}

function setDev(newState) {
	if (typeof newState !== 'object') {
		throw new Error(
			this._debugName + '.set was called without an object of data key-values to update.'
		);
	}

	this._checkReadOnly(newState);
	set.call(this, newState);
}

function callAll(fns) {
	while (fns && fns.length) fns.shift()();
}

function _mount(target, anchor) {
	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
}

var protoDev = {
	destroy: destroyDev,
	get,
	fire,
	on,
	set: setDev,
	_recompute: noop,
	_set,
	_stage,
	_mount,
	_differs
};

/* generated by Svelte vX.Y.Z */

function bar({ foo }) {
	return foo * 2;
}

const file = undefined;

function create_main_fragment(component, ctx) {
	var p, text_value = ctx.Math.max(0, ctx.foo), text, text_1, text_2;

	return {
		c: function create() {
			p = createElement("p");
			text = createText(text_value);
			text_1 = createText("\n\t");
			text_2 = createText(ctx.bar);
			addLoc(p, file, 0, 0, 0);
		},

		m: function mount(target, anchor) {
			insert(target, p, anchor);
			append(p, text);
			append(p, text_1);
			append(p, text_2);
		},

		p: function update(changed, ctx) {
			if ((changed.Math || changed.foo) && text_value !== (text_value = ctx.Math.max(0, ctx.foo))) {
				setData(text, text_value);
			}

			if (changed.bar) {
				setData(text_2, ctx.bar);
			}
		},

		d: function destroy$$1(detach) {
			if (detach) {
				detachNode(p);
			}
		}
	};
}

function SvelteComponent(options) {
	this._debugName = '<SvelteComponent>';
	if (!options || (!options.target && !options.root)) throw new Error("'target' is a required option");
	init(this, options);
	this._state = assign({ Math : Math }, options.data);
	this._recompute({ foo: 1 }, this._state);
	if (!('foo' in this._state)) console.warn("<SvelteComponent> was created without expected data property 'foo'");
	this._intro = true;

	this._fragment = create_main_fragment(this, this._state);

	if (options.target) {
		if (options.hydrate) throw new Error("options.hydrate only works if the component was compiled with the `hydratable: true` option");
		this._fragment.c();
		this._mount(options.target, options.anchor);
	}
}

assign(SvelteComponent.prototype, protoDev);

SvelteComponent.prototype._checkReadOnly = function _checkReadOnly(newState) {
	if ('bar' in newState && !this._updatingReadonlyProperty) throw new Error("<SvelteComponent>: Cannot set read-only property 'bar'");
};

SvelteComponent.prototype._recompute = function _recompute(changed, state) {
	if (changed.foo) {
		if (this._differs(state.bar, (state.bar = bar(state)))) changed.bar = true;
	}
};

export default SvelteComponent;