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module.exports = function isFunction (node) {
if (typeof node !== 'object' || !node) {
throw new TypeError('estree-is-function: node must be an object')
}
if (typeof node.type !== 'string') {
throw new TypeError('estree-is-function: node must have a string type')
}
return node.type === 'FunctionDeclaration' || node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression'
}