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node_modules/@hapi/topo/LICENSE.md

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+Copyright (c) 2012-2020, Sideway Inc, and project contributors  
+Copyright (c) 2012-2014, Walmart.  
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+* The names of any contributors may not be used to endorse or promote products derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS OFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

node_modules/@hapi/topo/README.md

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+<a href="https://hapi.dev"><img src="https://raw.githubusercontent.com/hapijs/assets/master/images/family.png" width="180px" align="right" /></a>
+
+# @hapi/topo
+
+#### Topological sorting with grouping support.
+
+**topo** is part of the **hapi** ecosystem and was designed to work seamlessly with the [hapi web framework](https://hapi.dev) and its other components (but works great on its own or with other frameworks). If you are using a different web framework and find this module useful, check out [hapi](https://hapi.dev) – they work even better together.
+
+### Visit the [hapi.dev](https://hapi.dev) Developer Portal for tutorials, documentation, and support
+
+## Useful resources
+
+- [Documentation and API](https://hapi.dev/family/topo/)
+- [Version status](https://hapi.dev/resources/status/#topo) (builds, dependencies, node versions, licenses, eol)
+- [Changelog](https://hapi.dev/family/topo/changelog/)
+- [Project policies](https://hapi.dev/policies/)
+- [Free and commercial support options](https://hapi.dev/support/)

node_modules/@hapi/topo/lib/index.d.ts

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+export class Sorter<T> {
+
+    /**
+     * An array of the topologically sorted nodes. This list is renewed upon each call to topo.add().
+     */
+    nodes: T[];
+
+    /**
+     * Adds a node or list of nodes to be added and topologically sorted
+     * 
+     * @param nodes - A mixed value or array of mixed values to be added as nodes to the topologically sorted list.
+     * @param options - Optional sorting information about the nodes.
+     * 
+     * @returns Returns an array of the topologically sorted nodes.
+     */
+    add(nodes: T | T[], options?: Options): T[];
+
+    /**
+     * Merges another Sorter object into the current object.
+     * 
+     * @param others - The other object or array of objects to be merged into the current one.
+     * 
+     * @returns Returns an array of the topologically sorted nodes.
+     */
+    merge(others: Sorter<T> | Sorter<T>[]): T[];
+
+    /**
+     * Sorts the nodes array (only required if the manual option is used when adding items)
+     */
+    sort(): T[];
+}
+
+
+export interface Options {
+
+    /**
+     * The sorting group the added items belong to
+     */
+    readonly group?: string;
+
+    /**
+     * The group or groups the added items must come before
+     */
+    readonly before?: string | string[];
+
+    /**
+     * The group or groups the added items must come after
+     */
+    readonly after?: string | string[];
+
+    /**
+     * A number used to sort items with equal before/after requirements
+     */
+    readonly sort?: number;
+
+    /**
+     * If true, the array is not sorted automatically until sort() is called
+     */
+    readonly manual?: boolean;
+}

node_modules/@hapi/topo/lib/index.js

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+'use strict';
+
+const Assert = require('@hapi/hoek/lib/assert');
+
+
+const internals = {};
+
+
+exports.Sorter = class {
+
+    constructor() {
+
+        this._items = [];
+        this.nodes = [];
+    }
+
+    add(nodes, options) {
+
+        options = options || {};
+
+        // Validate rules
+
+        const before = [].concat(options.before || []);
+        const after = [].concat(options.after || []);
+        const group = options.group || '?';
+        const sort = options.sort || 0;                   // Used for merging only
+
+        Assert(!before.includes(group), `Item cannot come before itself: ${group}`);
+        Assert(!before.includes('?'), 'Item cannot come before unassociated items');
+        Assert(!after.includes(group), `Item cannot come after itself: ${group}`);
+        Assert(!after.includes('?'), 'Item cannot come after unassociated items');
+
+        if (!Array.isArray(nodes)) {
+            nodes = [nodes];
+        }
+
+        for (const node of nodes) {
+            const item = {
+                seq: this._items.length,
+                sort,
+                before,
+                after,
+                group,
+                node
+            };
+
+            this._items.push(item);
+        }
+
+        // Insert event
+
+        if (!options.manual) {
+            const valid = this._sort();
+            Assert(valid, 'item', group !== '?' ? `added into group ${group}` : '', 'created a dependencies error');
+        }
+
+        return this.nodes;
+    }
+
+    merge(others) {
+
+        if (!Array.isArray(others)) {
+            others = [others];
+        }
+
+        for (const other of others) {
+            if (other) {
+                for (const item of other._items) {
+                    this._items.push(Object.assign({}, item));      // Shallow cloned
+                }
+            }
+        }
+
+        // Sort items
+
+        this._items.sort(internals.mergeSort);
+        for (let i = 0; i < this._items.length; ++i) {
+            this._items[i].seq = i;
+        }
+
+        const valid = this._sort();
+        Assert(valid, 'merge created a dependencies error');
+
+        return this.nodes;
+    }
+
+    sort() {
+
+        const valid = this._sort();
+        Assert(valid, 'sort created a dependencies error');
+
+        return this.nodes;
+    }
+
+    _sort() {
+
+        // Construct graph
+
+        const graph = {};
+        const graphAfters = Object.create(null);            // A prototype can bungle lookups w/ false positives
+        const groups = Object.create(null);
+
+        for (const item of this._items) {
+            const seq = item.seq;                           // Unique across all items
+            const group = item.group;
+
+            // Determine Groups
+
+            groups[group] = groups[group] || [];
+            groups[group].push(seq);
+
+            // Build intermediary graph using 'before'
+
+            graph[seq] = item.before;
+
+            // Build second intermediary graph with 'after'
+
+            for (const after of item.after) {
+                graphAfters[after] = graphAfters[after] || [];
+                graphAfters[after].push(seq);
+            }
+        }
+
+        // Expand intermediary graph
+
+        for (const node in graph) {
+            const expandedGroups = [];
+
+            for (const graphNodeItem in graph[node]) {
+                const group = graph[node][graphNodeItem];
+                groups[group] = groups[group] || [];
+                expandedGroups.push(...groups[group]);
+            }
+
+            graph[node] = expandedGroups;
+        }
+
+        // Merge intermediary graph using graphAfters into final graph
+
+        for (const group in graphAfters) {
+            if (groups[group]) {
+                for (const node of groups[group]) {
+                    graph[node].push(...graphAfters[group]);
+                }
+            }
+        }
+
+        // Compile ancestors
+
+        const ancestors = {};
+        for (const node in graph) {
+            const children = graph[node];
+            for (const child of children) {
+                ancestors[child] = ancestors[child] || [];
+                ancestors[child].push(node);
+            }
+        }
+
+        // Topo sort
+
+        const visited = {};
+        const sorted = [];
+
+        for (let i = 0; i < this._items.length; ++i) {          // Looping through item.seq values out of order
+            let next = i;
+
+            if (ancestors[i]) {
+                next = null;
+                for (let j = 0; j < this._items.length; ++j) {  // As above, these are item.seq values
+                    if (visited[j] === true) {
+                        continue;
+                    }
+
+                    if (!ancestors[j]) {
+                        ancestors[j] = [];
+                    }
+
+                    const shouldSeeCount = ancestors[j].length;
+                    let seenCount = 0;
+                    for (let k = 0; k < shouldSeeCount; ++k) {
+                        if (visited[ancestors[j][k]]) {
+                            ++seenCount;
+                        }
+                    }
+
+                    if (seenCount === shouldSeeCount) {
+                        next = j;
+                        break;
+                    }
+                }
+            }
+
+            if (next !== null) {
+                visited[next] = true;
+                sorted.push(next);
+            }
+        }
+
+        if (sorted.length !== this._items.length) {
+            return false;
+        }
+
+        const seqIndex = {};
+        for (const item of this._items) {
+            seqIndex[item.seq] = item;
+        }
+
+        this._items = [];
+        this.nodes = [];
+
+        for (const value of sorted) {
+            const sortedItem = seqIndex[value];
+            this.nodes.push(sortedItem.node);
+            this._items.push(sortedItem);
+        }
+
+        return true;
+    }
+};
+
+
+internals.mergeSort = (a, b) => {
+
+    return a.sort === b.sort ? 0 : (a.sort < b.sort ? -1 : 1);
+};

node_modules/@hapi/topo/package.json

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+{
+  "_from": "@hapi/topo@^5.0.0",
+  "_id": "@hapi/topo@5.1.0",
+  "_inBundle": false,
+  "_integrity": "sha512-foQZKJig7Ob0BMAYBfcJk8d77QtOe7Wo4ox7ff1lQYoNNAb6jwcY1ncdoy2e9wQZzvNy7ODZCYJkK8kzmcAnAg==",
+  "_location": "/@hapi/topo",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "range",
+    "registry": true,
+    "raw": "@hapi/topo@^5.0.0",
+    "name": "@hapi/topo",
+    "escapedName": "@hapi%2ftopo",
+    "scope": "@hapi",
+    "rawSpec": "^5.0.0",
+    "saveSpec": null,
+    "fetchSpec": "^5.0.0"
+  },
+  "_requiredBy": [
+    "/joi"
+  ],
+  "_resolved": "https://registry.npmjs.org/@hapi/topo/-/topo-5.1.0.tgz",
+  "_shasum": "dc448e332c6c6e37a4dc02fd84ba8d44b9afb012",
+  "_spec": "@hapi/topo@^5.0.0",
+  "_where": "C:\\Users\\zhouxueli\\Desktop\\scheduling-app\\node_modules\\joi",
+  "bugs": {
+    "url": "https://github.com/hapijs/topo/issues"
+  },
+  "bundleDependencies": false,
+  "dependencies": {
+    "@hapi/hoek": "^9.0.0"
+  },
+  "deprecated": false,
+  "description": "Topological sorting with grouping support",
+  "devDependencies": {
+    "@hapi/code": "8.x.x",
+    "@hapi/lab": "24.x.x",
+    "typescript": "~4.0.2"
+  },
+  "files": [
+    "lib"
+  ],
+  "homepage": "https://github.com/hapijs/topo#readme",
+  "keywords": [
+    "topological",
+    "sort",
+    "toposort",
+    "topsort"
+  ],
+  "license": "BSD-3-Clause",
+  "main": "lib/index.js",
+  "name": "@hapi/topo",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/hapijs/topo.git"
+  },
+  "scripts": {
+    "test": "lab -a @hapi/code -t 100 -L -Y",
+    "test-cov-html": "lab -a @hapi/code -t 100 -L -r html -o coverage.html"
+  },
+  "types": "lib/index.d.ts",
+  "version": "5.1.0"
+}