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Directory : /usr/local/lib/node_modules/serve/node_modules/onetime/
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| Current File : //usr/local/lib/node_modules/serve/node_modules/onetime/index.js |
'use strict';
const mimicFn = require('mimic-fn');
const calledFunctions = new WeakMap();
const onetime = (function_, options = {}) => {
if (typeof function_ !== 'function') {
throw new TypeError('Expected a function');
}
let returnValue;
let callCount = 0;
const functionName = function_.displayName || function_.name || '<anonymous>';
const onetime = function (...arguments_) {
calledFunctions.set(onetime, ++callCount);
if (callCount === 1) {
returnValue = function_.apply(this, arguments_);
function_ = null;
} else if (options.throw === true) {
throw new Error(`Function \`${functionName}\` can only be called once`);
}
return returnValue;
};
mimicFn(onetime, function_);
calledFunctions.set(onetime, callCount);
return onetime;
};
module.exports = onetime;
// TODO: Remove this for the next major release
module.exports.default = onetime;
module.exports.callCount = function_ => {
if (!calledFunctions.has(function_)) {
throw new Error(`The given function \`${function_.name}\` is not wrapped by the \`onetime\` package`);
}
return calledFunctions.get(function_);
};
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