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67 lines
1.6 KiB
67 lines
1.6 KiB
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/**
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* Module exports.
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*/
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module.exports = deprecate;
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/**
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* Mark that a method should not be used.
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* Returns a modified function which warns once by default.
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*
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* If `localStorage.noDeprecation = true` is set, then it is a no-op.
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*
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* If `localStorage.throwDeprecation = true` is set, then deprecated functions
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* will throw an Error when invoked.
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*
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* If `localStorage.traceDeprecation = true` is set, then deprecated functions
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* will invoke `console.trace()` instead of `console.error()`.
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*
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* @param {Function} fn - the function to deprecate
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* @param {String} msg - the string to print to the console when `fn` is invoked
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* @returns {Function} a new "deprecated" version of `fn`
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* @api public
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*/
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function deprecate (fn, msg) {
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if (config('noDeprecation')) {
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return fn;
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}
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var warned = false;
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function deprecated() {
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if (!warned) {
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if (config('throwDeprecation')) {
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throw new Error(msg);
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} else if (config('traceDeprecation')) {
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console.trace(msg);
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} else {
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console.warn(msg);
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}
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warned = true;
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}
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return fn.apply(this, arguments);
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}
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return deprecated;
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}
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/**
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* Checks `localStorage` for boolean values for the given `name`.
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*
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* @param {String} name
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* @returns {Boolean}
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* @api private
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*/
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function config (name) {
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// accessing global.localStorage can trigger a DOMException in sandboxed iframes
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try {
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if (!global.localStorage) return false;
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} catch (_) {
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return false;
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}
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var val = global.localStorage[name];
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if (null == val) return false;
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return String(val).toLowerCase() === 'true';
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}
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