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var msgLines=['Document Metadata:','',`- Title: ${document.title}`,...Array.from(document.querySelectorAll('meta')).flatMap(el => el.name ? `- ${el.name[0].toUpperCase()}${el.name.slice(1)}: ${el.content}` : [])].join('\n');alert(msgLines);

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Vim Cheatsheet

Motions

Navigation

• w: Move [] -> next word
• W: Move [] -> next WORD

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/* Combined Union Type + Array of allowed values */
const ServerEnvironments = ['development', 'test', 'stage', 'production'] as const;

// equivalent to `type ServerEnvironments = 'development' | 'test' | 'stage' | 'production'
type ServerEnvironments = typeof ServerEnvironments[number];

const serverEnv: ServerEnvironments = 'development';

const isValidServerEnv = (env: string): env is ServerEnvironments => ServerEnvironments.include(env);

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Module Directories

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const nodeCustomInspect = Symbol.for('nodejs.util.inspect.custom');
const denoCustomInspect = Symbol.for("Deno.customInspect");

const Ctor = () => ({});

Object.assign(Ctor, {
    prototype: {
        constructor: Ctor,

        toString() {

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export {};

/** @see https://bobbyhadz.com/blog/typescript-process-env-type */
declare global {
  namespace NodeJS {
    interface ProcessEnv {
      // Added keys for process.env
    }
  }
}

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function before<A, B, C>(this: (a: A) => B, g: (b: B) => C): (a: A) => C {
    const f = this;
    return function (x) {
        return g(f(x));
//         return g.call(this, f.call(this, x));
    };
};

function after<A, B, C>(this: (b: B) => C, g: (a: A) => B): (a: A) => C {
    const f = this;

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import { describe } from 'src/utils/testing';
import { renderHook } from '@testing-library/react-hooks';

//////// useConstant.test.ts ////////

import useConstant from 'src/hooks/useConstant';

describe('useConstant()', async assert => {
    const testStateValue = { value: 'abc' };

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import type { FC } from 'react';

export type MyComponentProps = {
  // prop types
};

const Step1: FC<MyComponentProps>;

export default MyComponent;

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/**
 * Combinators
 *
 * @see https://en.wikipedia.org/wiki/SKI_combinator_calculus
 * @see https://en.wikipedia.org/wiki/B,_C,_K,_W_system
 * @see https://www.angelfire.com/tx4/cus/combinator/birds.html
 * @see https://leanpub.com/combinators/read
 * @see https://www.amazon.com/gp/product/B00A1P096Y
 */