54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
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import { isFunction } from 'min-dash';
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// TODO(nikku): remove with future bpmn-js version
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/**
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* Wraps APIs to check:
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*
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* 1) If a callback is passed -> Warn users about callback deprecation.
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* 2) If Promise class is implemented in current environment.
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*
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* @private
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*/
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export function wrapForCompatibility(api) {
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return function() {
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if (!window.Promise) {
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throw new Error('Promises is not supported in this environment. Consider polyfilling.');
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}
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var argLen = arguments.length;
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if (argLen >= 1 && isFunction(arguments[argLen - 1])) {
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var callback = arguments[argLen - 1];
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console.warn(new Error(
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'Passing callbacks to ' + api.name + ' is deprecated and will be removed in a future major release.' +
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'Please switch to promises, cf. https://bpmn.io/l/moving-to-promises.html'
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));
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var argsWithoutCallback = Array.prototype.slice.call(arguments, 0, -1);
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api.apply(this, argsWithoutCallback).then(function(result) {
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var firstKey = Object.keys(result)[0];
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// The APIs we are wrapping all resolve a single item depending on the API.
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// For instance, importXML resolves { warnings } and saveXML returns { xml }.
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// That's why we can call the callback with the first item of result.
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return callback(null, result[firstKey]);
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// Passing a second paramter instead of catch because we don't want to
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// catch errors thrown by callback().
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}, function(err) {
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return callback(err, err.warnings);
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});
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} else {
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return api.apply(this, arguments);
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}
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};
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}
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