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(function initLazyAss() {
function isArrayLike(a) {
return a && typeof a.length === 'number';
}
function toStringArray(arr) {
return 'array with ' + arr.length + ' items.\n[' +
arr.map(toString).join(',') + ']\n';
}
function isPrimitive(arg) {
return typeof arg === 'string' ||
typeof arg === 'number' ||
typeof arg === 'boolean';
}
function isError(e) {
return e instanceof Error;
}
/*
custom JSON.stringify replacer to make sure we do not
hide properties that have value "undefined"
var o = {
foo: 42,
bar: undefined
}
// standard JSON.stringify returns '{"foo": 42}'
// this replacer returns '{"foo": 42, "bar": null}'
*/
function replacer(key, value) {
if (value === undefined) {
return null;
}
return value;
}
function toString(arg, k) {
if (isPrimitive(arg)) {
return JSON.stringify(arg);
}
if (arg instanceof Error) {
return arg.name + ' ' + arg.message;
}
if (Array.isArray(arg)) {
return toStringArray(arg);
}
if (isArrayLike(arg)) {
return toStringArray(Array.prototype.slice.call(arg, 0));
}
var argString;
try {
argString = JSON.stringify(arg, replacer, 2);
} catch (err) {
argString = '{ cannot stringify arg ' + k + ', it has type "' + typeof arg + '"';
if (typeof arg === 'object') {
argString += ' with keys ' + Object.keys(arg).join(', ') + ' }';
} else {
argString += ' }';
}
}
return argString;
}
function endsWithNewLine(s) {
return /\n$/.test(s);
}
function formMessage(args) {
var msg = args.reduce(function (total, arg, k) {
if (k && !endsWithNewLine(total)) {
total += ' ';
}
if (typeof arg === 'string') {
return total + arg;
}
if (typeof arg === 'function') {
var fnResult;
try {
fnResult = arg();
} catch (err) {
// ignore the error
fnResult = '[function ' + arg.name + ' threw error!]';
}
return total + fnResult;
}
var argString = toString(arg, k);
return total + argString;
}, '');
return msg;
}
function lazyAssLogic(condition) {
if (isError(condition)) {
return condition;
}
var fn = typeof condition === 'function' ? condition : null;
if (fn) {
condition = fn();
}
if (!condition) {
var args = [].slice.call(arguments, 1);
if (fn) {
args.unshift(fn.toString());
}
return new Error(formMessage(args));
}
}
var lazyAss = function lazyAss() {
var err = lazyAssLogic.apply(null, arguments);
if (err) {
throw err;
}
};
var lazyAssync = function lazyAssync() {
var err = lazyAssLogic.apply(null, arguments);
if (err) {
setTimeout(function () {
throw err;
}, 0);
}
};
lazyAss.async = lazyAssync;
function isNode() {
return typeof global === 'object';
}
function isBrowser() {
return typeof window === 'object';
}
function isCommonJS() {
return typeof module === 'object';
}
function globalRegister() {
if (isNode()) {
/* global global */
register(global, lazyAss, 'lazyAss', 'la');
register(global, lazyAssync, 'lazyAssync', 'lac');
}
}
function register(root, value, name, alias) {
root[name] = root[alias] = value;
}
lazyAss.globalRegister = globalRegister;
if (isBrowser()) {
/* global window */
register(window, lazyAss, 'lazyAss', 'la');
register(window, lazyAssync, 'lazyAssync', 'lac');
}
if (isCommonJS()) {
/* global module */
module.exports = lazyAss;
}
}());
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