update

node_modules/rxjs/_esm2015/Subscription.js

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+import { isArray } from './util/isArray';
+import { isObject } from './util/isObject';
+import { isFunction } from './util/isFunction';
+import { tryCatch } from './util/tryCatch';
+import { errorObject } from './util/errorObject';
+import { UnsubscriptionError } from './util/UnsubscriptionError';
+/**
+ * Represents a disposable resource, such as the execution of an Observable. A
+ * Subscription has one important method, `unsubscribe`, that takes no argument
+ * and just disposes the resource held by the subscription.
+ *
+ * Additionally, subscriptions may be grouped together through the `add()`
+ * method, which will attach a child Subscription to the current Subscription.
+ * When a Subscription is unsubscribed, all its children (and its grandchildren)
+ * will be unsubscribed as well.
+ *
+ * @class Subscription
+ */
+export class Subscription {
+    /**
+     * @param {function(): void} [unsubscribe] A function describing how to
+     * perform the disposal of resources when the `unsubscribe` method is called.
+     */
+    constructor(unsubscribe) {
+        /**
+         * A flag to indicate whether this Subscription has already been unsubscribed.
+         * @type {boolean}
+         */
+        this.closed = false;
+        this._parent = null;
+        this._parents = null;
+        this._subscriptions = null;
+        if (unsubscribe) {
+            this._unsubscribe = unsubscribe;
+        }
+    }
+    /**
+     * Disposes the resources held by the subscription. May, for instance, cancel
+     * an ongoing Observable execution or cancel any other type of work that
+     * started when the Subscription was created.
+     * @return {void}
+     */
+    unsubscribe() {
+        let hasErrors = false;
+        let errors;
+        if (this.closed) {
+            return;
+        }
+        let { _parent, _parents, _unsubscribe, _subscriptions } = this;
+        this.closed = true;
+        this._parent = null;
+        this._parents = null;
+        // null out _subscriptions first so any child subscriptions that attempt
+        // to remove themselves from this subscription will noop
+        this._subscriptions = null;
+        let index = -1;
+        let len = _parents ? _parents.length : 0;
+        // if this._parent is null, then so is this._parents, and we
+        // don't have to remove ourselves from any parent subscriptions.
+        while (_parent) {
+            _parent.remove(this);
+            // if this._parents is null or index >= len,
+            // then _parent is set to null, and the loop exits
+            _parent = ++index < len && _parents[index] || null;
+        }
+        if (isFunction(_unsubscribe)) {
+            let trial = tryCatch(_unsubscribe).call(this);
+            if (trial === errorObject) {
+                hasErrors = true;
+                errors = errors || (errorObject.e instanceof UnsubscriptionError ?
+                    flattenUnsubscriptionErrors(errorObject.e.errors) : [errorObject.e]);
+            }
+        }
+        if (isArray(_subscriptions)) {
+            index = -1;
+            len = _subscriptions.length;
+            while (++index < len) {
+                const sub = _subscriptions[index];
+                if (isObject(sub)) {
+                    let trial = tryCatch(sub.unsubscribe).call(sub);
+                    if (trial === errorObject) {
+                        hasErrors = true;
+                        errors = errors || [];
+                        let err = errorObject.e;
+                        if (err instanceof UnsubscriptionError) {
+                            errors = errors.concat(flattenUnsubscriptionErrors(err.errors));
+                        }
+                        else {
+                            errors.push(err);
+                        }
+                    }
+                }
+            }
+        }
+        if (hasErrors) {
+            throw new UnsubscriptionError(errors);
+        }
+    }
+    /**
+     * Adds a tear down to be called during the unsubscribe() of this
+     * Subscription.
+     *
+     * If the tear down being added is a subscription that is already
+     * unsubscribed, is the same reference `add` is being called on, or is
+     * `Subscription.EMPTY`, it will not be added.
+     *
+     * If this subscription is already in an `closed` state, the passed
+     * tear down logic will be executed immediately.
+     *
+     * @param {TeardownLogic} teardown The additional logic to execute on
+     * teardown.
+     * @return {Subscription} Returns the Subscription used or created to be
+     * added to the inner subscriptions list. This Subscription can be used with
+     * `remove()` to remove the passed teardown logic from the inner subscriptions
+     * list.
+     */
+    add(teardown) {
+        if (!teardown || (teardown === Subscription.EMPTY)) {
+            return Subscription.EMPTY;
+        }
+        if (teardown === this) {
+            return this;
+        }
+        let subscription = teardown;
+        switch (typeof teardown) {
+            case 'function':
+                subscription = new Subscription(teardown);
+            case 'object':
+                if (subscription.closed || typeof subscription.unsubscribe !== 'function') {
+                    return subscription;
+                }
+                else if (this.closed) {
+                    subscription.unsubscribe();
+                    return subscription;
+                }
+                else if (typeof subscription._addParent !== 'function' /* quack quack */) {
+                    const tmp = subscription;
+                    subscription = new Subscription();
+                    subscription._subscriptions = [tmp];
+                }
+                break;
+            default:
+                throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');
+        }
+        const subscriptions = this._subscriptions || (this._subscriptions = []);
+        subscriptions.push(subscription);
+        subscription._addParent(this);
+        return subscription;
+    }
+    /**
+     * Removes a Subscription from the internal list of subscriptions that will
+     * unsubscribe during the unsubscribe process of this Subscription.
+     * @param {Subscription} subscription The subscription to remove.
+     * @return {void}
+     */
+    remove(subscription) {
+        const subscriptions = this._subscriptions;
+        if (subscriptions) {
+            const subscriptionIndex = subscriptions.indexOf(subscription);
+            if (subscriptionIndex !== -1) {
+                subscriptions.splice(subscriptionIndex, 1);
+            }
+        }
+    }
+    _addParent(parent) {
+        let { _parent, _parents } = this;
+        if (!_parent || _parent === parent) {
+            // If we don't have a parent, or the new parent is the same as the
+            // current parent, then set this._parent to the new parent.
+            this._parent = parent;
+        }
+        else if (!_parents) {
+            // If there's already one parent, but not multiple, allocate an Array to
+            // store the rest of the parent Subscriptions.
+            this._parents = [parent];
+        }
+        else if (_parents.indexOf(parent) === -1) {
+            // Only add the new parent to the _parents list if it's not already there.
+            _parents.push(parent);
+        }
+    }
+}
+Subscription.EMPTY = (function (empty) {
+    empty.closed = true;
+    return empty;
+}(new Subscription()));
+function flattenUnsubscriptionErrors(errors) {
+    return errors.reduce((errs, err) => errs.concat((err instanceof UnsubscriptionError) ? err.errors : err), []);
+}
+//# sourceMappingURL=Subscription.js.map