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'use strict';
var objectAssign = require('object-assign');
module.exports = function (options, fn, target) {
var chainables = options.chainableMethods || {};
var spread = options.spread;
var defaults = objectAssign({}, options.defaults);
function extend(target, getter, ctx) {
Object.keys(chainables).forEach(function (key) {
Object.defineProperty(target, key, {
enumerable: true,
configurable: true,
get: function () {
return wrap(getter, chainables[key], ctx || this);
}
});
});
}
function wrap(createOpts, extensionOpts, ctx) {
function wrappedOpts() {
return objectAssign(createOpts(), extensionOpts);
}
function wrappedFn() {
var args = new Array(arguments.length);
for (var i = 0; i < args.length; i++) {
args[i] = arguments[i];
}
if (spread) {
args.unshift(wrappedOpts());
} else {
args = [wrappedOpts(), args];
}
return fn.apply(ctx || this, args);
}
extend(wrappedFn, wrappedOpts, ctx);
return wrappedFn;
}
function copyDefaults() {
return objectAssign({}, defaults);
}
if (target) {
extend(target, copyDefaults);
return target;
}
return wrap(copyDefaults);
};
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