'use strict' var convert = require('./convert') module.exports = is is.convert = convert // Assert if `test` passes for `node`. // When a `parent` node is known the `index` of node should also be given. // eslint-disable-next-line max-params function is(node, test, index, parent, context) { var hasParent = parent !== null && parent !== undefined var hasIndex = index !== null && index !== undefined var check = convert(test) if ( hasIndex && (typeof index !== 'number' || index < 0 || index === Infinity) ) { throw new Error('Expected positive finite index or child node') } if (hasParent && (!is(parent) || !parent.children)) { throw new Error('Expected parent node') } if (!node || !node.type || typeof node.type !== 'string') { return false } if (hasParent !== hasIndex) { throw new Error('Expected both parent and index') } return Boolean(check.call(context, node, index, parent)) }