react-shimmer/dist/react-shimmer.esm.js

React Image (Suspense-like) Loader component that simulates a shimmer effect

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import clsx from 'clsx';

function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
  try {
    var info = gen[key](arg);
    var value = info.value;
  } catch (error) {
    reject(error);
    return;
  }

  if (info.done) {
    resolve(value);
  } else {
    Promise.resolve(value).then(_next, _throw);
  }
}

function _asyncToGenerator(fn) {
  return function () {
    var self = this,
        args = arguments;
    return new Promise(function (resolve, reject) {
      var gen = fn.apply(self, args);

      function _next(value) {
        asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value);
      }

      function _throw(err) {
        asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err);
      }

      _next(undefined);
    });
  };
}

function _extends() {
  _extends = Object.assign || function (target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i];

      for (var key in source) {
        if (Object.prototype.hasOwnProperty.call(source, key)) {
          target[key] = source[key];
        }
      }
    }

    return target;
  };

  return _extends.apply(this, arguments);
}

function _inheritsLoose(subClass, superClass) {
  subClass.prototype = Object.create(superClass.prototype);
  subClass.prototype.constructor = subClass;

  _setPrototypeOf(subClass, superClass);
}

function _getPrototypeOf(o) {
  _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
    return o.__proto__ || Object.getPrototypeOf(o);
  };
  return _getPrototypeOf(o);
}

function _setPrototypeOf(o, p) {
  _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
    o.__proto__ = p;
    return o;
  };

  return _setPrototypeOf(o, p);
}

function _isNativeReflectConstruct() {
  if (typeof Reflect === "undefined" || !Reflect.construct) return false;
  if (Reflect.construct.sham) return false;
  if (typeof Proxy === "function") return true;

  try {
    Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {}));
    return true;
  } catch (e) {
    return false;
  }
}

function _construct(Parent, args, Class) {
  if (_isNativeReflectConstruct()) {
    _construct = Reflect.construct;
  } else {
    _construct = function _construct(Parent, args, Class) {
      var a = [null];
      a.push.apply(a, args);
      var Constructor = Function.bind.apply(Parent, a);
      var instance = new Constructor();
      if (Class) _setPrototypeOf(instance, Class.prototype);
      return instance;
    };
  }

  return _construct.apply(null, arguments);
}

function _isNativeFunction(fn) {
  return Function.toString.call(fn).indexOf("[native code]") !== -1;
}

function _wrapNativeSuper(Class) {
  var _cache = typeof Map === "function" ? new Map() : undefined;

  _wrapNativeSuper = function _wrapNativeSuper(Class) {
    if (Class === null || !_isNativeFunction(Class)) return Class;

    if (typeof Class !== "function") {
      throw new TypeError("Super expression must either be null or a function");
    }

    if (typeof _cache !== "undefined") {
      if (_cache.has(Class)) return _cache.get(Class);

      _cache.set(Class, Wrapper);
    }

    function Wrapper() {
      return _construct(Class, arguments, _getPrototypeOf(this).constructor);
    }

    Wrapper.prototype = Object.create(Class.prototype, {
      constructor: {
        value: Wrapper,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
    return _setPrototypeOf(Wrapper, Class);
  };

  return _wrapNativeSuper(Class);
}

function _objectWithoutPropertiesLoose(source, excluded) {
  if (source == null) return {};
  var target = {};
  var sourceKeys = Object.keys(source);
  var key, i;

  for (i = 0; i < sourceKeys.length; i++) {
    key = sourceKeys[i];
    if (excluded.indexOf(key) >= 0) continue;
    target[key] = source[key];
  }

  return target;
}

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

var runtime_1 = createCommonjsModule(function (module) {
/**
 * Copyright (c) 2014-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

var runtime = (function (exports) {

  var Op = Object.prototype;
  var hasOwn = Op.hasOwnProperty;
  var undefined$1; // More compressible than void 0.
  var $Symbol = typeof Symbol === "function" ? Symbol : {};
  var iteratorSymbol = $Symbol.iterator || "@@iterator";
  var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
  var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";

  function define(obj, key, value) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
    return obj[key];
  }
  try {
    // IE 8 has a broken Object.defineProperty that only works on DOM objects.
    define({}, "");
  } catch (err) {
    define = function(obj, key, value) {
      return obj[key] = value;
    };
  }

  function wrap(innerFn, outerFn, self, tryLocsList) {
    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
    var generator = Object.create(protoGenerator.prototype);
    var context = new Context(tryLocsList || []);

    // The ._invoke method unifies the implementations of the .next,
    // .throw, and .return methods.
    generator._invoke = makeInvokeMethod(innerFn, self, context);

    return generator;
  }
  exports.wrap = wrap;

  // Try/catch helper to minimize deoptimizations. Returns a completion
  // record like context.tryEntries[i].completion. This interface could
  // have been (and was previously) designed to take a closure to be
  // invoked without arguments, but in all the cases we care about we
  // already have an existing method we want to call, so there's no need
  // to create a new function object. We can even get away with assuming
  // the method takes exactly one argument, since that happens to be true
  // in every case, so we don't have to touch the arguments object. The
  // only additional allocation required is the completion record, which
  // has a stable shape and so hopefully should be cheap to allocate.
  function tryCatch(fn, obj, arg) {
    try {
      return { type: "normal", arg: fn.call(obj, arg) };
    } catch (err) {
      return { type: "throw", arg: err };
    }
  }

  var GenStateSuspendedStart = "suspendedStart";
  var GenStateSuspendedYield = "suspendedYield";
  var GenStateExecuting = "executing";
  var GenStateCompleted = "completed";

  // Returning this object from the innerFn has the same effect as
  // breaking out of the dispatch switch statement.
  var ContinueSentinel = {};

  // Dummy constructor functions that we use as the .constructor and
  // .constructor.prototype properties for functions that return Generator
  // objects. For full spec compliance, you may wish to configure your
  // minifier not to mangle the names of these two functions.
  function Generator() {}
  function GeneratorFunction() {}
  function GeneratorFunctionPrototype() {}

  // This is a polyfill for %IteratorPrototype% for environments that
  // don't natively support it.
  var IteratorPrototype = {};
  define(IteratorPrototype, iteratorSymbol, function () {
    return this;
  });

  var getProto = Object.getPrototypeOf;
  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
  if (NativeIteratorPrototype &&
      NativeIteratorPrototype !== Op &&
      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
    // This environment has a native %IteratorPrototype%; use it instead
    // of the polyfill.
    IteratorPrototype = NativeIteratorPrototype;
  }

  var Gp = GeneratorFunctionPrototype.prototype =
    Generator.prototype = Object.create(IteratorPrototype);
  GeneratorFunction.prototype = GeneratorFunctionPrototype;
  define(Gp, "constructor", GeneratorFunctionPrototype);
  define(GeneratorFunctionPrototype, "constructor", GeneratorFunction);
  GeneratorFunction.displayName = define(
    GeneratorFunctionPrototype,
    toStringTagSymbol,
    "GeneratorFunction"
  );

  // Helper for defining the .next, .throw, and .return methods of the
  // Iterator interface in terms of a single ._invoke method.
  function defineIteratorMethods(prototype) {
    ["next", "throw", "return"].forEach(function(method) {
      define(prototype, method, function(arg) {
        return this._invoke(method, arg);
      });
    });
  }

  exports.isGeneratorFunction = function(genFun) {
    var ctor = typeof genFun === "function" && genFun.constructor;
    return ctor
      ? ctor === GeneratorFunction ||
        // For the native GeneratorFunction constructor, the best we can
        // do is to check its .name property.
        (ctor.displayName || ctor.name) === "GeneratorFunction"
      : false;
  };

  exports.mark = function(genFun) {
    if (Object.setPrototypeOf) {
      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
    } else {
      genFun.__proto__ = GeneratorFunctionPrototype;
      define(genFun, toStringTagSymbol, "GeneratorFunction");
    }
    genFun.prototype = Object.create(Gp);
    return genFun;
  };

  // Within the body of any async function, `await x` is transformed to
  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
  // `hasOwn.call(value, "__await")` to determine if the yielded value is
  // meant to be awaited.
  exports.awrap = function(arg) {
    return { __await: arg };
  };

  function AsyncIterator(generator, PromiseImpl) {
    function invoke(method, arg, resolve, reject) {
      var record = tryCatch(generator[method], generator, arg);
      if (record.type === "throw") {
        reject(record.arg);
      } else {
        var result = record.arg;
        var value = result.value;
        if (value &&
            typeof value === "object" &&
            hasOwn.call(value, "__await")) {
          return PromiseImpl.resolve(value.__await).then(function(value) {
            invoke("next", value, resolve, reject);
          }, function(err) {
            invoke("throw", err, resolve, reject);
          });
        }

        return PromiseImpl.resolve(value).then(function(unwrapped) {
          // When a yielded Promise is resolved, its final value becomes
          // the .value of the Promise<{value,done}> result for the
          // current iteration.
          result.value = unwrapped;
          resolve(result);
        }, function(error) {
          // If a rejected Promise was yielded, throw the rejection back
          // into the async generator function so it can be handled there.
          return invoke("throw", error, resolve, reject);
        });
      }
    }

    var previousPromise;

    function enqueue(method, arg) {
      function callInvokeWithMethodAndArg() {
        return new PromiseImpl(function(resolve, reject) {
          invoke(method, arg, resolve, reject);
        });
      }

      return previousPromise =
        // If enqueue has been called before, then we want to wait until
        // all previous Promises have been resolved before calling invoke,
        // so that results are always delivered in the correct order. If
        // enqueue has not been called before, then it is important to
        // call invoke immediately, without waiting on a callback to fire,
        // so that the async generator function has the opportunity to do
        // any necessary setup in a predictable way. This predictability
        // is why the Promise constructor synchronously invokes its
        // executor callback, and why async functions synchronously
        // execute code before the first await. Since we implement simple
        // async functions in terms of async generators, it is especially
        // important to get this right, even though it requires care.
        previousPromise ? previousPromise.then(
          callInvokeWithMethodAndArg,
          // Avoid propagating failures to Promises returned by later
          // invocations of the iterator.
          callInvokeWithMethodAndArg
        ) : callInvokeWithMethodAndArg();
    }

    // Define the unified helper method that is used to implement .next,
    // .throw, and .return (see defineIteratorMethods).
    this._invoke = enqueue;
  }

  defineIteratorMethods(AsyncIterator.prototype);
  define(AsyncIterator.prototype, asyncIteratorSymbol, function () {
    return this;
  });
  exports.AsyncIterator = AsyncIterator;

  // Note that simple async functions are implemented on top of
  // AsyncIterator objects; they just return a Promise for the value of
  // the final result produced by the iterator.
  exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {
    if (PromiseImpl === void 0) PromiseImpl = Promise;

    var iter = new AsyncIterator(
      wrap(innerFn, outerFn, self, tryLocsList),
      PromiseImpl
    );

    return exports.isGeneratorFunction(outerFn)
      ? iter // If outerFn is a generator, return the full iterator.
      : iter.next().then(function(result) {
          return result.done ? result.value : iter.next();
        });
  };

  function makeInvokeMethod(innerFn, self, context) {
    var state = GenStateSuspendedStart;

    return function invoke(method, arg) {
      if (state === GenStateExecuting) {
        throw new Error("Generator is already running");
      }

      if (state === GenStateCompleted) {
        if (method === "throw") {
          throw arg;
        }

        // Be forgiving, per 25.3.3.3.3 of the spec:
        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
        return doneResult();
      }

      context.method = method;
      context.arg = arg;

      while (true) {
        var delegate = context.delegate;
        if (delegate) {
          var delegateResult = maybeInvokeDelegate(delegate, context);
          if (delegateResult) {
            if (delegateResult === ContinueSentinel) continue;
            return delegateResult;
          }
        }

        if (context.method === "next") {
          // Setting context._sent for legacy support of Babel's
          // function.sent implementation.
          context.sent = context._sent = context.arg;

        } else if (context.method === "throw") {
          if (state === GenStateSuspendedStart) {
            state = GenStateCompleted;
            throw context.arg;
          }

          context.dispatchException(context.arg);

        } else if (context.method === "return") {
          context.abrupt("return", context.arg);
        }

        state = GenStateExecuting;

        var record = tryCatch(innerFn, self, context);
        if (record.type === "normal") {
          // If an exception is thrown from innerFn, we leave state ===
          // GenStateExecuting and loop back for another invocation.
          state = context.done
            ? GenStateCompleted
            : GenStateSuspendedYield;

          if (record.arg === ContinueSentinel) {
            continue;
          }

          return {
            value: record.arg,
            done: context.done
          };

        } else if (record.type === "throw") {
          state = GenStateCompleted;
          // Dispatch the exception by looping back around to the
          // context.dispatchException(context.arg) call above.
          context.method = "throw";
          context.arg = record.arg;
        }
      }
    };
  }

  // Call delegate.iterator[context.method](context.arg) and handle the
  // result, either by returning a { value, done } result from the
  // delegate iterator, or by modifying context.method and context.arg,
  // setting context.delegate to null, and returning the ContinueSentinel.
  function maybeInvokeDelegate(delegate, context) {
    var method = delegate.iterator[context.method];
    if (method === undefined$1) {
      // A .throw or .return when the delegate iterator has no .throw
      // method always terminates the yield* loop.
      context.delegate = null;

      if (context.method === "throw") {
        // Note: ["return"] must be used for ES3 parsing compatibility.
        if (delegate.iterator["return"]) {
          // If the delegate iterator has a return method, give it a
          // chance to clean up.
          context.method = "return";
          context.arg = undefined$1;
          maybeInvokeDelegate(delegate, context);

          if (context.method === "throw") {
            // If maybeInvokeDelegate(context) changed context.method from
            // "return" to "throw", let that override the TypeError below.
            return ContinueSentinel;
          }
        }

        context.method = "throw";
        context.arg = new TypeError(
          "The iterator does not provide a 'throw' method");
      }

      return ContinueSentinel;
    }

    var record = tryCatch(method, delegate.iterator, context.arg);

    if (record.type === "throw") {
      context.method = "throw";
      context.arg = record.arg;
      context.delegate = null;
      return ContinueSentinel;
    }

    var info = record.arg;

    if (! info) {
      context.method = "throw";
      context.arg = new TypeError("iterator result is not an object");
      context.delegate = null;
      return ContinueSentinel;
    }

    if (info.done) {
      // Assign the result of the finished delegate to the temporary
      // variable specified by delegate.resultName (see delegateYield).
      context[delegate.resultName] = info.value;

      // Resume execution at the desired location (see delegateYield).
      context.next = delegate.nextLoc;

      // If context.method was "throw" but the delegate handled the
      // exception, let the outer generator proceed normally. If
      // context.method was "next", forget context.arg since it has been
      // "consumed" by the delegate iterator. If context.method was
      // "return", allow the original .return call to continue in the
      // outer generator.
      if (context.method !== "return") {
        context.method = "next";
        context.arg = undefined$1;
      }

    } else {
      // Re-yield the result returned by the delegate method.
      return info;
    }

    // The delegate iterator is finished, so forget it and continue with
    // the outer generator.
    context.delegate = null;
    return ContinueSentinel;
  }

  // Define Generator.prototype.{next,throw,return} in terms of the
  // unified ._invoke helper method.
  defineIteratorMethods(Gp);

  define(Gp, toStringTagSymbol, "Generator");

  // A Generator should always return itself as the iterator object when the
  // @@iterator function is called on it. Some browsers' implementations of the
  // iterator prototype chain incorrectly implement this, causing the Generator
  // object to not be returned from this call. This ensures that doesn't happen.
  // See https://github.com/facebook/regenerator/issues/274 for more details.
  define(Gp, iteratorSymbol, function() {
    return this;
  });

  define(Gp, "toString", function() {
    return "[object Generator]";
  });

  function pushTryEntry(locs) {
    var entry = { tryLoc: locs[0] };

    if (1 in locs) {
      entry.catchLoc = locs[1];
    }

    if (2 in locs) {
      entry.finallyLoc = locs[2];
      entry.afterLoc = locs[3];
    }

    this.tryEntries.push(entry);
  }

  function resetTryEntry(entry) {
    var record = entry.completion || {};
    record.type = "normal";
    delete record.arg;
    entry.completion = record;
  }

  function Context(tryLocsList) {
    // The root entry object (effectively a try statement without a catch
    // or a finally block) gives us a place to store values thrown from
    // locations where there is no enclosing try statement.
    this.tryEntries = [{ tryLoc: "root" }];
    tryLocsList.forEach(pushTryEntry, this);
    this.reset(true);
  }

  exports.keys = function(object) {
    var keys = [];
    for (var key in object) {
      keys.push(key);
    }
    keys.reverse();

    // Rather than returning an object with a next method, we keep
    // things simple and return the next function itself.
    return function next() {
      while (keys.length) {
        var key = keys.pop();
        if (key in object) {
          next.value = key;
          next.done = false;
          return next;
        }
      }

      // To avoid creating an additional object, we just hang the .value
      // and .done properties off the next function object itself. This
      // also ensures that the minifier will not anonymize the function.
      next.done = true;
      return next;
    };
  };

  function values(iterable) {
    if (iterable) {
      var iteratorMethod = iterable[iteratorSymbol];
      if (iteratorMethod) {
        return iteratorMethod.call(iterable);
      }

      if (typeof iterable.next === "function") {
        return iterable;
      }

      if (!isNaN(iterable.length)) {
        var i = -1, next = function next() {
          while (++i < iterable.length) {
            if (hasOwn.call(iterable, i)) {
              next.value = iterable[i];
              next.done = false;
              return next;
            }
          }

          next.value = undefined$1;
          next.done = true;

          return next;
        };

        return next.next = next;
      }
    }

    // Return an iterator with no values.
    return { next: doneResult };
  }
  exports.values = values;

  function doneResult() {
    return { value: undefined$1, done: true };
  }

  Context.prototype = {
    constructor: Context,

    reset: function(skipTempReset) {
      this.prev = 0;
      this.next = 0;
      // Resetting context._sent for legacy support of Babel's
      // function.sent implementation.
      this.sent = this._sent = undefined$1;
      this.done = false;
      this.delegate = null;

      this.method = "next";
      this.arg = undefined$1;

      this.tryEntries.forEach(resetTryEntry);

      if (!skipTempReset) {
        for (var name in this) {
          // Not sure about the optimal order of these conditions:
          if (name.charAt(0) === "t" &&
              hasOwn.call(this, name) &&
              !isNaN(+name.slice(1))) {
            this[name] = undefined$1;
          }
        }
      }
    },

    stop: function() {
      this.done = true;

      var rootEntry = this.tryEntries[0];
      var rootRecord = rootEntry.completion;
      if (rootRecord.type === "throw") {
        throw rootRecord.arg;
      }

      return this.rval;
    },

    dispatchException: function(exception) {
      if (this.done) {
        throw exception;
      }

      var context = this;
      function handle(loc, caught) {
        record.type = "throw";
        record.arg = exception;
        context.next = loc;

        if (caught) {
          // If the dispatched exception was caught by a catch block,
          // then let that catch block handle the exception normally.
          context.method = "next";
          context.arg = undefined$1;
        }

        return !! caught;
      }

      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        var record = entry.completion;

        if (entry.tryLoc === "root") {
          // Exception thrown outside of any try block that could handle
          // it, so set the completion value of the entire function to
          // throw the exception.
          return handle("end");
        }

        if (entry.tryLoc <= this.prev) {
          var hasCatch = hasOwn.call(entry, "catchLoc");
          var hasFinally = hasOwn.call(entry, "finallyLoc");

          if (hasCatch && hasFinally) {
            if (this.prev < entry.catchLoc) {
              return handle(entry.catchLoc, true);
            } else if (this.prev < entry.finallyLoc) {
              return handle(entry.finallyLoc);
            }

          } else if (hasCatch) {
            if (this.prev < entry.catchLoc) {
              return handle(entry.catchLoc, true);
            }

          } else if (hasFinally) {
            if (this.prev < entry.finallyLoc) {
              return handle(entry.finallyLoc);
            }

          } else {
            throw new Error("try statement without catch or finally");
          }
        }
      }
    },

    abrupt: function(type, arg) {
      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        if (entry.tryLoc <= this.prev &&
            hasOwn.call(entry, "finallyLoc") &&
            this.prev < entry.finallyLoc) {
          var finallyEntry = entry;
          break;
        }
      }

      if (finallyEntry &&
          (type === "break" ||
           type === "continue") &&
          finallyEntry.tryLoc <= arg &&
          arg <= finallyEntry.finallyLoc) {
        // Ignore the finally entry if control is not jumping to a
        // location outside the try/catch block.
        finallyEntry = null;
      }

      var record = finallyEntry ? finallyEntry.completion : {};
      record.type = type;
      record.arg = arg;

      if (finallyEntry) {
        this.method = "next";
        this.next = finallyEntry.finallyLoc;
        return ContinueSentinel;
      }

      return this.complete(record);
    },

    complete: function(record, afterLoc) {
      if (record.type === "throw") {
        throw record.arg;
      }

      if (record.type === "break" ||
          record.type === "continue") {
        this.next = record.arg;
      } else if (record.type === "return") {
        this.rval = this.arg = record.arg;
        this.method = "return";
        this.next = "end";
      } else if (record.type === "normal" && afterLoc) {
        this.next = afterLoc;
      }

      return ContinueSentinel;
    },

    finish: function(finallyLoc) {
      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        if (entry.finallyLoc === finallyLoc) {
          this.complete(entry.completion, entry.afterLoc);
          resetTryEntry(entry);
          return ContinueSentinel;
        }
      }
    },

    "catch": function(tryLoc) {
      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        if (entry.tryLoc === tryLoc) {
          var record = entry.completion;
          if (record.type === "throw") {
            var thrown = record.arg;
            resetTryEntry(entry);
          }
          return thrown;
        }
      }

      // The context.catch method must only be called with a location
      // argument that corresponds to a known catch block.
      throw new Error("illegal catch attempt");
    },

    delegateYield: function(iterable, resultName, nextLoc) {
      this.delegate = {
        iterator: values(iterable),
        resultName: resultName,
        nextLoc: nextLoc
      };

      if (this.method === "next") {
        // Deliberately forget the last sent value so that we don't
        // accidentally pass it on to the delegate.
        this.arg = undefined$1;
      }

      return ContinueSentinel;
    }
  };

  // Regardless of whether this script is executing as a CommonJS module
  // or not, return the runtime object so that we can declare the variable
  // regeneratorRuntime in the outer scope, which allows this module to be
  // injected easily by `bin/regenerator --include-runtime script.js`.
  return exports;

}(
  // If this script is executing as a CommonJS module, use module.exports
  // as the regeneratorRuntime namespace. Otherwise create a new empty
  // object. Either way, the resulting object will be used to initialize
  // the regeneratorRuntime variable at the top of this file.
   module.exports 
));

try {
  regeneratorRuntime = runtime;
} catch (accidentalStrictMode) {
  // This module should not be running in strict mode, so the above
  // assignment should always work unless something is misconfigured. Just
  // in case runtime.js accidentally runs in strict mode, in modern engines
  // we can explicitly access globalThis. In older engines we can escape
  // strict mode using a global Function call. This could conceivably fail
  // if a Content Security Policy forbids using Function, but in that case
  // the proper solution is to fix the accidental strict mode problem. If
  // you've misconfigured your bundler to force strict mode and applied a
  // CSP to forbid Function, and you're not willing to fix either of those
  // problems, please detail your unique predicament in a GitHub issue.
  if (typeof globalThis === "object") {
    globalThis.regeneratorRuntime = runtime;
  } else {
    Function("r", "regeneratorRuntime = r")(runtime);
  }
}
});

var IntendedError = /*#__PURE__*/function (_Error) {
  _inheritsLoose(IntendedError, _Error);

  function IntendedError(intention) {
    var _this;

    if (intention === void 0) {
      intention = 'forcePromiseReject';
    }

    for (var _len = arguments.length, params = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      params[_key - 1] = arguments[_key];
    }

    _this = _Error.call.apply(_Error, [this].concat(params)) || this;
    _this.createdAt = new Date();
    _this.intention = intention;
    return _this;
  }

  return IntendedError;
}( /*#__PURE__*/_wrapNativeSuper(Error));

function styleInject(css, ref) {
  if ( ref === void 0 ) ref = {};
  var insertAt = ref.insertAt;

  if (!css || typeof document === 'undefined') { return; }

  var head = document.head || document.getElementsByTagName('head')[0];
  var style = document.createElement('style');
  style.type = 'text/css';

  if (insertAt === 'top') {
    if (head.firstChild) {
      head.insertBefore(style, head.firstChild);
    } else {
      head.appendChild(style);
    }
  } else {
    head.appendChild(style);
  }

  if (style.styleSheet) {
    style.styleSheet.cssText = css;
  } else {
    style.appendChild(document.createTextNode(css));
  }
}

var css_248z = ".fadein {\n  animation-name: fadein;\n  animation-duration: 0.3s;\n  animation-fill-mode: forwards;\n}\n\n@keyframes fadein {\n  from { opacity: 0; }\n  to   { opacity: 1; }\n}\n";
styleInject(css_248z);

var _excluded = ["className"];
var initialState = {
  isLoading: false,
  error: ''
};
var SuspenseImage = /*#__PURE__*/function (_Component) {
  _inheritsLoose(SuspenseImage, _Component);

  function SuspenseImage() {
    var _this;

    _this = _Component.apply(this, arguments) || this;
    _this.state = _extends({}, initialState);
    _this._isMounted = false;
    _this.imgRef = React.createRef();
    _this.start = /*#__PURE__*/_asyncToGenerator( /*#__PURE__*/runtime_1.mark(function _callee() {
      var _this$props, src, fallback, delay, errorMessage;

      return runtime_1.wrap(function _callee$(_context) {
        while (1) {
          switch (_context.prev = _context.next) {
            case 0:
              _this$props = _this.props, src = _this$props.src, fallback = _this$props.fallback, delay = _this$props.delay;

              if (!(!src || !fallback)) {
                _context.next = 6;
                break;
              }

              errorMessage = 'src and fallback props must be provided.';

              if (process.env.NODE_ENV !== 'production') {
                console.error(errorMessage);
              }

              _this.setState({
                error: errorMessage
              });

              return _context.abrupt("return");

            case 6:
              /*
               * To avoid instant loading 'flash' while downloading images with high-speed internet connection
               * (or downloading smaller images that do not need much loading-time),
               * user may want to give delay before starting to show the loading indicator.
               */
              if (delay && delay > 0) {
                _this.timeoutId = setTimeout(function () {
                  _this.timeoutId = undefined;

                  if (!_this.state.error && _this._isMounted) {
                    _this.setState({
                      isLoading: true
                    });
                  }
                }, delay);
              } else {
                _this.setState({
                  isLoading: true
                });
              }

              _this.tryLoadImage();

            case 8:
            case "end":
              return _context.stop();
          }
        }
      }, _callee);
    }));
    _this.loadImage = /*#__PURE__*/_asyncToGenerator( /*#__PURE__*/runtime_1.mark(function _callee3() {
      var img, onLoad;
      return runtime_1.wrap(function _callee3$(_context3) {
        while (1) {
          switch (_context3.prev = _context3.next) {
            case 0:
              img = _this.imgRef.current;

              if (img) {
                _context3.next = 3;
                break;
              }

              return _context3.abrupt("return");

            case 3:
              onLoad = _this.props.onLoad;
              return _context3.abrupt("return", new Promise(function (resolve, reject) {
                _this.forceReject = reject;

                var onResolve = /*#__PURE__*/function () {
                  var _ref3 = _asyncToGenerator( /*#__PURE__*/runtime_1.mark(function _callee2() {
                    return runtime_1.wrap(function _callee2$(_context2) {
                      while (1) {
                        switch (_context2.prev = _context2.next) {
                          case 0:
                            if (!(img.decode !== undefined)) {
                              _context2.next = 9;
                              break;
                            }

                            _context2.prev = 1;
                            _context2.next = 4;
                            return img.decode();

                          case 4:
                            _context2.next = 9;
                            break;

                          case 6:
                            _context2.prev = 6;
                            _context2.t0 = _context2["catch"](1);

                            if (process.env.NODE_ENV !== 'production') {
                              console.error('An Error occurred while trying to decode an image', _context2.t0);
                            }

                          case 9:
                            resolve();

                            if (onLoad) {
                              onLoad(img);
                            }

                          case 11:
                          case "end":
                            return _context2.stop();
                        }
                      }
                    }, _callee2, null, [[1, 6]]);
                  }));

                  return function onResolve() {
                    return _ref3.apply(this, arguments);
                  };
                }();

                var onReject = function onReject() {
                  reject(new Error('An Error occurred while trying to download an image'));
                };

                if (img.complete) {
                  onResolve();
                } else {
                  img.onload = onResolve;
                }

                img.onerror = onReject;
              }));

            case 5:
            case "end":
              return _context3.stop();
          }
        }
      }, _callee3);
    }));
    _this.tryLoadImage = /*#__PURE__*/_asyncToGenerator( /*#__PURE__*/runtime_1.mark(function _callee4() {
      return runtime_1.wrap(function _callee4$(_context4) {
        while (1) {
          switch (_context4.prev = _context4.next) {
            case 0:
              _context4.prev = 0;
              _context4.next = 3;
              return _this.loadImage();

            case 3:
              if (_this._isMounted) {
                _this.setState({
                  isLoading: false
                });
              }

              _context4.next = 9;
              break;

            case 6:
              _context4.prev = 6;
              _context4.t0 = _context4["catch"](0);

              // If this is an intended(forced) rejection, don't make it visible to user.
              if (!(_context4.t0 instanceof IntendedError) && _this._isMounted) {
                _this.setState({
                  error: _context4.t0,
                  isLoading: false
                });
              }

            case 9:
            case "end":
              return _context4.stop();
          }
        }
      }, _callee4, null, [[0, 6]]);
    }));
    return _this;
  }

  var _proto = SuspenseImage.prototype;

  _proto.componentDidMount = function componentDidMount() {
    this._isMounted = true;
    this.start();
  };

  _proto.componentDidUpdate = function componentDidUpdate(prevProps) {
    var _this2 = this;

    var src = this.props.src;

    if (src && src !== prevProps.src) {
      this.safeClearTimeout();
      this.forceReject && this.forceReject(new IntendedError());
      this.setState(_extends({}, initialState), function () {
        return _this2.start();
      });
    }
  };

  _proto.componentWillUnmount = function componentWillUnmount() {
    this._isMounted = false;
    this.forceReject = undefined;
    this.safeClearTimeout();
  };

  _proto.safeClearTimeout = function safeClearTimeout() {
    if (this.timeoutId) {
      clearTimeout(this.timeoutId);
      this.timeoutId = undefined;
    }
  };

  _proto.render = function render() {
    var _this$state = this.state,
        error = _this$state.error,
        isLoading = _this$state.isLoading;
    var _this$props2 = this.props,
        src = _this$props2.src,
        fallback = _this$props2.fallback,
        errorFallback = _this$props2.errorFallback,
        fadeIn = _this$props2.fadeIn,
        NativeImgProps = _this$props2.NativeImgProps;

    var _ref5 = NativeImgProps || {},
        className = _ref5.className,
        stripClassname = _objectWithoutPropertiesLoose(_ref5, _excluded);

    if (isLoading) {
      return fallback;
    } else if (error) {
      return errorFallback ? errorFallback(error) : React.createElement("span", {
        role: "button",
        "aria-label": "Image failed to load"
      }, "\u274C");
    } else if (src) {
      return React.createElement("img", Object.assign({}, stripClassname, {
        className: clsx({
          fadein: fadeIn
        }, className),
        ref: this.imgRef,
        decoding: "async",
        src: src
      }));
    }

    return null;
  };

  return SuspenseImage;
}(Component);
SuspenseImage.propTypes = {
  src: PropTypes.string.isRequired,
  fallback: PropTypes.element.isRequired,
  errorFallback: PropTypes.func,
  onLoad: PropTypes.func,
  delay: PropTypes.number,
  fadeIn: PropTypes.bool,
  NativeImgProps: PropTypes.object
};

var css_248z$1 = ":root {\n  --default-bg-color: #f6f7f8;\n  --default-bg-moving-gradient: linear-gradient(to right, rgb(238, 238, 238) 8%, rgb(222, 222, 222) 18%,  rgb(238, 238, 238) 33%);\n}\n\n.shimmer {\n  background: var(--default-bg-color);\n\tbackground-image: var(--default-bg-moving-gradient);\n  background-repeat: no-repeat;\n  animation: shimmering forwards infinite ease-in-out, fadein 0.02s forwards;\n}\n\n@keyframes fadein {\n  from {\n    opacity: 0;\n  }\n\n  to {\n    opacity: 1;\n  }\n}\n\n@keyframes shimmering {\n\tfrom {\n\t\tbackground-position: top right;\n\t}\n\n\tto {\n\t\tbackground-position: top left;\n\t}\n}\n";
styleInject(css_248z$1);

var DEFAULT_DURATION_MS = 1600;
var DEFAULT_HEIGHT = 400;
var DEFAULT_WIDTH = 400;

var calcShimmerStyle = function calcShimmerStyle(width, height, duration) {
  if (duration === void 0) {
    duration = DEFAULT_DURATION_MS;
  }

  return {
    backgroundSize: width * 10 + "px " + height + "px",
    animationDuration: (duration / 1000).toFixed(1) + "s"
  };
};

var Shimmer = function Shimmer(_ref) {
  var className = _ref.className,
      duration = _ref.duration,
      _ref$height = _ref.height,
      height = _ref$height === void 0 ? DEFAULT_HEIGHT : _ref$height,
      _ref$width = _ref.width,
      width = _ref$width === void 0 ? DEFAULT_WIDTH : _ref$width;
  var shimmerStyle = calcShimmerStyle(width, height, duration);

  var style = _extends({}, shimmerStyle, {
    height: height,
    width: width
  });

  return React.createElement("div", {
    className: clsx('shimmer', className),
    style: style
  });
};
Shimmer.propTypes = {
  height: PropTypes.number.isRequired,
  width: PropTypes.number.isRequired,
  className: PropTypes.string,
  duration: PropTypes.number
};

var css_248z$2 = ":root {\n  --default-bg-color: #e1e2e4;\n}\n\n.breathing {\n  width: 100%;\n  height: 100%;\n  background: var(--default-bg-color);\n  animation: breathing ease-in-out infinite alternate;\n}\n\n@keyframes breathing {\n  from {\n    opacity: 0.25;\n  }\n  to {\n    opacity: 1;\n  }\n}\n";
styleInject(css_248z$2);

var DEFAULT_DURATION_MS$1 = 1000;
var Breathing = function Breathing(_ref) {
  var className = _ref.className,
      _ref$duration = _ref.duration,
      duration = _ref$duration === void 0 ? DEFAULT_DURATION_MS$1 : _ref$duration,
      height = _ref.height,
      width = _ref.width;
  var style = {
    height: height,
    width: width,
    animationDuration: (duration / 1000).toFixed(1) + "s"
  };
  return React.createElement("div", {
    className: clsx('breathing', className),
    style: style
  });
};
Breathing.propTypes = {
  className: PropTypes.string,
  duration: PropTypes.number,
  height: /*#__PURE__*/PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
  width: /*#__PURE__*/PropTypes.oneOfType([PropTypes.string, PropTypes.number])
};

export { Breathing, SuspenseImage as Image, Shimmer };
//# sourceMappingURL=react-shimmer.esm.js.map