Typescript Capstone

src/index.ts

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+import {HttpRequest} from "./util/HttpRequest";
+import {HTTP_STATUS_INTERNAL_SERVER_ERROR, HTTP_STATUS_OK} from "./util/HttpUtil";
+import {Observable} from "./service/Observable";
+import {requestsMock} from "./util/MockData";
+import {User} from "./model/User";
+
+const handleRequest = (request: HttpRequest<User>) => {
+    console.log(`Handling user ${request.body?.name}`);
+    return {status: HTTP_STATUS_OK};
+};
+const handleError = (error: HttpRequest<User>) => {
+    console.log(`Error happened for user ${error.body?.name}`);
+    return {status: HTTP_STATUS_INTERNAL_SERVER_ERROR};
+};
+
+const handleComplete = () => console.log('Completed');
+
+const requests = Observable.from<User>(requestsMock);
+
+const subscription = requests.subscribe({
+    next: handleRequest,
+    error: handleError,
+    complete: handleComplete
+});
+subscription.unsubscribe();

src/model/Role.ts

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+export enum Role {
+    user,
+    admin
+}

src/model/User.ts

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+import {Role} from "./Role";
+
+export class User {
+
+    private _name: string;
+    private _age: number;
+    private _roles: Role[];
+    private _createdAt: Date;
+    private _isDeleted: boolean;
+
+    constructor(name: string, age: number, roles: Role[], createdAt: Date, isDeleted: boolean) {
+        this._name = name;
+        this._age = age;
+        this._roles = roles;
+        this._createdAt = createdAt;
+        this._isDeleted = isDeleted;
+    }
+
+    get name(): string {
+        return this._name;
+    }
+
+    get age(): number {
+        return this._age;
+    }
+
+    get roles(): Role[] {
+        return this._roles;
+    }
+
+    get createdAt(): Date {
+        return this._createdAt;
+    }
+
+    get isDeleted(): boolean {
+        return this._isDeleted;
+    }
+}

src/service/Observable.ts

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+import {HttpRequest} from "../util/HttpRequest";
+import {Observer} from "./Observer";
+import {RequestHandler} from "./RequestHandler";
+
+type subscribeFunction<T> = (observer: Observer<T>) => any;
+
+export class Observable<T> {
+
+    private readonly subscribeFunction: subscribeFunction<T>;
+
+    private constructor(subscribeFunction: subscribeFunction<T>) {
+        this.subscribeFunction = subscribeFunction;
+    }
+
+    static from<T>(values: HttpRequest<T>[]) {
+        return new Observable((observer: Observer<HttpRequest<T>>) => {
+            values.forEach((value: HttpRequest<T>) => observer.next(value));
+            // Added error loop for testing
+            values.forEach((value: HttpRequest<T>) => observer.error(value));
+            observer.complete();
+            return () => {
+                console.log('unsubscribed');
+            };
+        });
+    }
+
+    subscribe(obs: RequestHandler<T>) {
+        const observer = new Observer(obs);
+        observer._unsubscribe = this.subscribeFunction(observer);
+        return ({
+            unsubscribe() {
+                observer.unsubscribe();
+            }
+        });
+    }
+}

src/service/Observer.ts

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+import {RequestHandler} from "./RequestHandler";
+
+export class Observer<T> {
+    private handler: RequestHandler<T>;
+    private isUnsubscribed: boolean;
+    public _unsubscribe?: () => void;
+
+    constructor(handler: RequestHandler<T>) {
+        this.handler = handler;
+        this.isUnsubscribed = false;
+    }
+
+    public next(value: T) {
+        if (this.handler.next && !this.isUnsubscribed) {
+            this.handler.next(value);
+        }
+    }
+
+    public error(error: T) {
+        if (!this.isUnsubscribed) {
+            if (this.handler.error) {
+                this.handler.error(error);
+            }
+            this.unsubscribe();
+        }
+    }
+
+    public complete() {
+        if (!this.isUnsubscribed) {
+            if (this.handler.complete) {
+                this.handler.complete();
+            }
+            this.unsubscribe();
+        }
+    }
+
+    unsubscribe() {
+        this.isUnsubscribed = true;
+        if (this._unsubscribe) {
+            this._unsubscribe();
+        }
+    }
+}

src/service/RequestHandler.ts

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+type nextRequestHandler<T> = (request: T) => { status: number };
+type errorRequestHandler<T> = (request: T) => { status: number };
+type completeRequestHandler = () => void;
+
+export interface RequestHandler<T> {
+    next: nextRequestHandler<T>;
+    error: errorRequestHandler<T>,
+    complete: completeRequestHandler
+}

src/util/HttpMethod.ts

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+export enum HttpMethod {
+    GET,
+    POST,
+    PUT,
+    DELETE
+}

src/util/HttpRequest.ts

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+import {HttpMethod} from "./HttpMethod";
+
+export class HttpRequest<T> {
+
+    private _method: HttpMethod;
+    private _host: string;
+    private _path: string;
+    private _body?: T;
+    private _params: Map<string, string>;
+
+    constructor(method: HttpMethod, host: string, path: string, params: Map<string, string>, body?: T) {
+        this._method = method;
+        this._host = host;
+        this._path = path;
+        this._body = body;
+        this._params = params;
+    }
+
+    get method(): HttpMethod {
+        return this._method;
+    }
+
+    get host(): string {
+        return this._host;
+    }
+
+    get path(): string {
+        return this._path;
+    }
+
+    get body(): T | undefined {
+        return this._body;
+    }
+
+    get params(): Map<string, string> {
+        return this._params;
+    }
+}
+
+
+

src/util/HttpUtil.ts

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+export const HTTP_STATUS_OK = 200;
+export const HTTP_STATUS_INTERNAL_SERVER_ERROR = 500;

src/util/MockData.ts

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+import {HttpRequest} from "./HttpRequest";
+import {HttpMethod} from "./HttpMethod";
+import {Role} from "../model/Role";
+import {User} from "../model/User";
+
+export const userMock: User = new User(
+    'Jon',
+    26,
+    [
+        Role.user,
+        Role.admin
+    ],
+    new Date(),
+    false);
+
+
+export const requestsMock: HttpRequest<User>[] = [
+    new HttpRequest(HttpMethod.POST,
+        'service.example',
+        'user',
+        new Map(),
+        userMock),
+    new HttpRequest(HttpMethod.GET,
+        'service.example',
+        'user',
+        new Map<string, string>([['id', '3f5h67s4s']]))
+];

tsconfig.json

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+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig to read more about this file */
+
+    /* Projects */
+    // "incremental": true,                              /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
+    // "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
+    // "tsBuildInfoFile": "./.tsbuildinfo",              /* Specify the path to .tsbuildinfo incremental compilation file. */
+    // "disableSourceOfProjectReferenceRedirect": true,  /* Disable preferring source files instead of declaration files when referencing composite projects. */
+    // "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
+    // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
+
+    /* Language and Environment */
+    "target": "es2016",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
+    // "lib": [],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
+    // "jsx": "preserve",                                /* Specify what JSX code is generated. */
+    // "experimentalDecorators": true,                   /* Enable experimental support for legacy experimental decorators. */
+    // "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
+    // "jsxFactory": "",                                 /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
+    // "jsxFragmentFactory": "",                         /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
+    // "jsxImportSource": "",                            /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
+    // "reactNamespace": "",                             /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
+    // "noLib": true,                                    /* Disable including any library files, including the default lib.d.ts. */
+    // "useDefineForClassFields": true,                  /* Emit ECMAScript-standard-compliant class fields. */
+    // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */
+
+    /* Modules */
+    "module": "commonjs",                                /* Specify what module code is generated. */
+    // "rootDir": "./",                                  /* Specify the root folder within your source files. */
+    // "moduleResolution": "node10",                     /* Specify how TypeScript looks up a file from a given module specifier. */
+    // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
+    // "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
+    // "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
+    // "typeRoots": [],                                  /* Specify multiple folders that act like './node_modules/@types'. */
+    // "types": [],                                      /* Specify type package names to be included without being referenced in a source file. */
+    // "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
+    // "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */
+    // "allowImportingTsExtensions": true,               /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */
+    // "resolvePackageJsonExports": true,                /* Use the package.json 'exports' field when resolving package imports. */
+    // "resolvePackageJsonImports": true,                /* Use the package.json 'imports' field when resolving imports. */
+    // "customConditions": [],                           /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */
+    // "resolveJsonModule": true,                        /* Enable importing .json files. */
+    // "allowArbitraryExtensions": true,                 /* Enable importing files with any extension, provided a declaration file is present. */
+    // "noResolve": true,                                /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
+
+    /* JavaScript Support */
+    // "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
+    // "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
+    // "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
+
+    /* Emit */
+    // "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
+    // "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
+    // "emitDeclarationOnly": true,                      /* Only output d.ts files and not JavaScript files. */
+    // "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
+    // "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
+    // "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
+    // "outDir": "./",                                   /* Specify an output folder for all emitted files. */
+    // "removeComments": true,                           /* Disable emitting comments. */
+    // "noEmit": true,                                   /* Disable emitting files from a compilation. */
+    // "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
+    // "downlevelIteration": true,                       /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
+    // "sourceRoot": "",                                 /* Specify the root path for debuggers to find the reference source code. */
+    // "mapRoot": "",                                    /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSources": true,                            /* Include source code in the sourcemaps inside the emitted JavaScript. */
+    // "emitBOM": true,                                  /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
+    // "newLine": "crlf",                                /* Set the newline character for emitting files. */
+    // "stripInternal": true,                            /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
+    // "noEmitHelpers": true,                            /* Disable generating custom helper functions like '__extends' in compiled output. */
+    // "noEmitOnError": true,                            /* Disable emitting files if any type checking errors are reported. */
+    // "preserveConstEnums": true,                       /* Disable erasing 'const enum' declarations in generated code. */
+    // "declarationDir": "./",                           /* Specify the output directory for generated declaration files. */
+
+    /* Interop Constraints */
+    // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
+    // "verbatimModuleSyntax": true,                     /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
+    // "isolatedDeclarations": true,                     /* Require sufficient annotation on exports so other tools can trivially generate declaration files. */
+    // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
+    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
+    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
+    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */
+
+    /* Type Checking */
+    "strict": true,                                      /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,                         /* When type checking, take into account 'null' and 'undefined'. */
+    // "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
+    // "strictBindCallApply": true,                      /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
+    // "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
+    // "noImplicitThis": true,                           /* Enable error reporting when 'this' is given the type 'any'. */
+    // "useUnknownInCatchVariables": true,               /* Default catch clause variables as 'unknown' instead of 'any'. */
+    // "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
+    // "noUnusedLocals": true,                           /* Enable error reporting when local variables aren't read. */
+    // "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read. */
+    // "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
+    // "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
+    // "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
+    // "noUncheckedIndexedAccess": true,                 /* Add 'undefined' to a type when accessed using an index. */
+    // "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
+    // "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type. */
+    // "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
+    // "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */
+
+    /* Completeness */
+    // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
+    "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
+  }
+}