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TS Observer
Raw
.gitignore
node_modules
*.js
Raw
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script src="index.js" type="module"></script>
</body>
</html>
Raw
index.ts
import { Observer } from './observer.js'
import subscribers, { Subscriber } from './subscribers.js'
const app = new Observer()
subscribers.forEach((item: Subscriber) => app.subscribe(item))
setTimeout(
() => {
app.emit('first')
setTimeout(
() => {
app.emit('second')
setTimeout(
() => {
app.emit('LAST')
},
3456
)
},
2345
)
},
1234
)
Raw
observer.ts
import { Subscriber } from "./subscribers"
export class Observer {
_subscribers: Array<Subscriber> = []
emit(data: unknown) : void {
this._subscribers.forEach(sub => sub.onChange(data))
}
subscribe(subscriber: Subscriber) : void {
this._subscribers.push(subscriber)
}
}
Raw
package-lock.json
{
"name": "b3da49b308c07f13138d5d80cff0e7f5",
"version": "1.0.0",
"lockfileVersion": 2,
"requires": true,
"packages": {
"": {
"name": "b3da49b308c07f13138d5d80cff0e7f5",
"version": "1.0.0",
"license": "ISC",
"devDependencies": {
"static-server": "^2.2.1",
"typescript": "^4.4.3"
}
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"dev": true,
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}
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"escape-string-regexp": "^1.0.0",
"has-ansi": "^0.1.0",
"strip-ansi": "^0.3.0",
"supports-color": "^0.2.0"
},
"engines": {
"node": ">=0.10.0"
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"dev": true
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}
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"dev": true
},
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},
"bin": {
"has-ansi": "cli.js"
},
"engines": {
"node": ">=0.10.0"
}
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"engines": {
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"dev": true,
"bin": {
"mime": "cli.js"
},
"engines": {
"node": ">=4"
}
},
"node_modules/opn": {
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"resolved": "https://registry.npmjs.org/opn/-/opn-5.5.0.tgz",
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"dev": true,
"dependencies": {
"is-wsl": "^1.1.0"
},
"engines": {
"node": ">=4"
}
},
"node_modules/static-server": {
"version": "2.2.1",
"resolved": "https://registry.npmjs.org/static-server/-/static-server-2.2.1.tgz",
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"dev": true,
"dependencies": {
"chalk": "^0.5.1",
"commander": "^2.3.0",
"file-size": "0.0.5",
"mime": "^1.2.11",
"opn": "^5.2.0"
},
"bin": {
"static-server": "bin/static-server.js"
},
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"node": ">=4"
}
},
"node_modules/strip-ansi": {
"version": "0.3.0",
"resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-0.3.0.tgz",
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"dev": true,
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},
"bin": {
"strip-ansi": "cli.js"
},
"engines": {
"node": ">=0.10.0"
}
},
"node_modules/supports-color": {
"version": "0.2.0",
"resolved": "https://registry.npmjs.org/supports-color/-/supports-color-0.2.0.tgz",
"integrity": "sha1-2S3iaU6z9nMjlz1649i1W0wiGQo=",
"dev": true,
"bin": {
"supports-color": "cli.js"
},
"engines": {
"node": ">=0.10.0"
}
},
"node_modules/typescript": {
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"integrity": "sha512-4xfscpisVgqqDfPaJo5vkd+Qd/ItkoagnHpufr+i2QCHBsNYp+G7UAoyFl8aPtx879u38wPV65rZ8qbGZijalA==",
"dev": true,
"bin": {
"tsc": "bin/tsc",
"tsserver": "bin/tsserver"
},
"engines": {
"node": ">=4.2.0"
}
}
},
"dependencies": {
"ansi-regex": {
"version": "0.2.1",
"resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-0.2.1.tgz",
"integrity": "sha1-DY6UaWej2BQ/k+JOKYUl/BsiNfk=",
"dev": true
},
"ansi-styles": {
"version": "1.1.0",
"resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-1.1.0.tgz",
"integrity": "sha1-6uy/Zs1waIJ2Cy9GkVgrj1XXp94=",
"dev": true
},
"chalk": {
"version": "0.5.1",
"resolved": "https://registry.npmjs.org/chalk/-/chalk-0.5.1.tgz",
"integrity": "sha1-Zjs6ZItotV0EaQ1JFnqoN4WPIXQ=",
"dev": true,
"requires": {
"ansi-styles": "^1.1.0",
"escape-string-regexp": "^1.0.0",
"has-ansi": "^0.1.0",
"strip-ansi": "^0.3.0",
"supports-color": "^0.2.0"
}
},
"commander": {
"version": "2.20.3",
"resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
"integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
"dev": true
},
"escape-string-regexp": {
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"resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
"integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
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"resolved": "https://registry.npmjs.org/has-ansi/-/has-ansi-0.1.0.tgz",
"integrity": "sha1-hPJlqujA5qiKEtcCKJS3VoiUxi4=",
"dev": true,
"requires": {
"ansi-regex": "^0.2.0"
}
},
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"resolved": "https://registry.npmjs.org/is-wsl/-/is-wsl-1.1.0.tgz",
"integrity": "sha1-HxbkqiKwTRM2tmGIpmrzxgDDpm0=",
"dev": true
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"mime": {
"version": "1.6.0",
"resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
"integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
"dev": true
},
"opn": {
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"resolved": "https://registry.npmjs.org/opn/-/opn-5.5.0.tgz",
"integrity": "sha512-PqHpggC9bLV0VeWcdKhkpxY+3JTzetLSqTCWL/z/tFIbI6G8JCjondXklT1JinczLz2Xib62sSp0T/gKT4KksA==",
"dev": true,
"requires": {
"is-wsl": "^1.1.0"
}
},
"static-server": {
"version": "2.2.1",
"resolved": "https://registry.npmjs.org/static-server/-/static-server-2.2.1.tgz",
"integrity": "sha512-j5eeW6higxYNmXMIT8iHjsdiViTpQDthg7o+SHsRtqdbxscdHqBHXwrXjHC8hL3F0Tsu34ApUpDkwzMBPBsrLw==",
"dev": true,
"requires": {
"chalk": "^0.5.1",
"commander": "^2.3.0",
"file-size": "0.0.5",
"mime": "^1.2.11",
"opn": "^5.2.0"
}
},
"strip-ansi": {
"version": "0.3.0",
"resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-0.3.0.tgz",
"integrity": "sha1-JfSOoiynkYfzF0pNuHWTR7sSYiA=",
"dev": true,
"requires": {
"ansi-regex": "^0.2.1"
}
},
"supports-color": {
"version": "0.2.0",
"resolved": "https://registry.npmjs.org/supports-color/-/supports-color-0.2.0.tgz",
"integrity": "sha1-2S3iaU6z9nMjlz1649i1W0wiGQo=",
"dev": true
},
"typescript": {
"version": "4.4.3",
"resolved": "https://registry.npmjs.org/typescript/-/typescript-4.4.3.tgz",
"integrity": "sha512-4xfscpisVgqqDfPaJo5vkd+Qd/ItkoagnHpufr+i2QCHBsNYp+G7UAoyFl8aPtx879u38wPV65rZ8qbGZijalA==",
"dev": true
}
}
}
Raw
package.json
{
"name": "b3da49b308c07f13138d5d80cff0e7f5",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "tsc --watch",
"serve": "static-server",
"test": "echo \"Error: no test specified\" && exit 1"
},
"repository": {
"type": "git",
"url": "git+ssh://git@gist.github.com/b3da49b308c07f13138d5d80cff0e7f5.git"
},
"keywords": [],
"author": "",
"license": "ISC",
"bugs": {
"url": "https://gist.github.com/b3da49b308c07f13138d5d80cff0e7f5"
},
"homepage": "https://gist.github.com/b3da49b308c07f13138d5d80cff0e7f5",
"devDependencies": {
"static-server": "^2.2.1",
"typescript": "^4.4.3"
}
}
Raw
subscribers.ts
export interface Subscriber {
type: string;
onChange(data: unknown) : void;
}
const consoleSubscriber: Subscriber = {
type: 'console',
onChange: data => console.debug(Date.now(), data)
}
const DOMSubscriber: Subscriber = {
type: 'dom',
onChange: data => document.write(`<h2>${data}</h2>`)
}
export default [
consoleSubscriber,
DOMSubscriber
]
Raw
tsconfig.json
{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig.json to read more about this file */
/* Projects */
// "incremental": true, /* Enable incremental compilation */
// "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */
// "tsBuildInfoFile": "./", /* Specify the folder for .tsbuildinfo incremental compilation files. */
// "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": "es5", /* 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 TC39 stage 2 draft 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. */
/* Modules */
"module": "ESNext", /* Specify what module code is generated. */
// "rootDir": "./", /* Specify the root folder within your source files. */
// "moduleResolution": "node", /* 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. */
// "resolveJsonModule": true, /* Enable importing .json files */
// "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. */
// "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. */
// "importsNotUsedAsValues": "remove", /* Specify emit/checking behavior for imports that are only used for types */
// "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. */
// "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */
// "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. */
// "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, /* Type catch clause variables as 'unknown' instead of 'any'. */
// "alwaysStrict": true, /* Ensure 'use strict' is always emitted. */
// "noUnusedLocals": true, /* Enable error reporting when a 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, /* Include 'undefined' in index signature results */
// "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. */
}
}
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