import addToArray from './addToArray.js'
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import defined from '../../Core/defined.js'
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/**
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* Adds an extension to gltf.extensionsUsed if it does not already exist.
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* Initializes extensionsUsed if it is not defined.
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*
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* @param {Object} gltf A javascript object containing a glTF asset.
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* @param {String} extension The extension to add.
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*
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* @private
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*/
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function addExtensionsUsed(gltf, extension) {
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var extensionsUsed = gltf.extensionsUsed;
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if (!defined(extensionsUsed)) {
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extensionsUsed = [];
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gltf.extensionsUsed = extensionsUsed;
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}
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addToArray(extensionsUsed, extension, true);
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}
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export default addExtensionsUsed;
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