frontend.md

  computed: {
    console: () => console,
    window: () => window,
  },
  
  import { mount, shallowMount } from '@vue/test-utils'
  
  
<select>
  <option v-for="(item , index) in categories" v-bind:key="index" :selected= "item.id == 30" >
    {{item.title}}
  </option>
</select>

import { mapGetters, mapState, mapActions } from 'vuex';

  props: {
    cell: {
      type: Object,
      required: true,
    },
  }
  
  <form @submit.prevent="onFormSubmit">

Ember

ember-data/addon/-private/adapters/build-url-mixin.js

unique = [... new Set (array)]

getEventListeners(window)

Runner.instance_.gameOver = () => {}

{{if (eq index (sub this.lems.length 1)) "rounded-b-full"}}


this.clock = sinon.useFakeTimers({ shouldAdvanceTime: true });
hooks.afterEach(function() {
  this.clock.restore();
});
    
    
[^\x00-\x7F] # find special chars

ember-intl
price_banner: The {product} costs {price, number, ::currency/USD}


import Model from '@ember-data/model';
import { inject as service } from '@ember/service';

export default {
  initialize() {
    Model.reopen({
      cacheResponse: service(),

      notifyBelongsToChanged() {
        if (this.get('cacheResponse').isRetry) {
          console.error('Infinite retry bug for failed relationship fetches detected. The following requests stopped!');
        } else {
          return this._super(...arguments);
        }
      },
    });
  }
};

"component-library": "file:../component-library",

return Ember.Test._helpers.pauseTest.method();

import tHelper from 'ember-i18n/helper';

    import { getOwner, setOwner } from '@ember/application';
    
    let owner = getOwner(this);
    let authenticator = owner.lookup(authenticatorName);
    setOwner(authenticator, owner);
    return authenticator;
    
  @action
  async authenticate(e) {
    await promise
  }

  
import { guidFor } from '@ember/object/internals';

// Use assign instead of merge to solve deprecation
- import { merge } from '@ember/polyfills';
- let parameters = merge(properties, {
+ import { assign } from '@ember/polyfills';
+ let parameters = assign(properties, {

isTesting: computed(() => testing)

- clipsSorting: ['position']
+ clipsSorting: Object.freeze(['position'])

find('*').textContent

return this.get('currentSchool.content').hasMany('submissionMethods').reload();

  app.import('node_modules/linkify-it/index.js', {
    using: [
      { transformation: 'cjs', as: 'linkify-it' }
    ]
  });
  

const { timeout: defaultTimeout } = config.flashMessageDefaults

# app/utils/update-session-token-in-local-storage.js

import { Promise } from 'rsvp';

export default function updateSessionTokenInLocalStorage(session, token) {
  return new Promise(resolve => {
    session.set('data.authenticated.smhw_token', token);
    const newSessionData = session.get('data');
    session.get('store').persist(newSessionData).then(() => resolve());
  });
}


      case 'findRecord':
        return this.urlForFindRecord(id, modelName, snapshot);
      case 'findAll':
        return this.urlForFindAll(modelName, snapshot);
      case 'query':
        return this.urlForQuery(query, modelName);
      case 'queryRecord':
        return this.urlForQueryRecord(query, modelName);
      case 'findMany':
        return this.urlForFindMany(id, modelName, snapshot);
      case 'findHasMany':
        return this.urlForFindHasMany(id, modelName, snapshot);
      case 'findBelongsTo':
        return this.urlForFindBelongsTo(id, modelName, snapshot);
      case 'createRecord':
        return this.urlForCreateRecord(modelName, snapshot);
      case 'updateRecord':
        return this.urlForUpdateRecord(id, modelName, snapshot);
      case 'deleteRecord':
        return this.urlForDeleteRecord(id, modelName, snapshot);

ps -A | grep ember

kill -USR1

yarn upgrade-interactive --latest

export NODE_PATH="$(npm config get prefix)/lib/node_modules"

+new Date it's just the same as (new Date()).getTime()

  model() {
    return { taskName: [] };
  },

  taskName: task(function*() {
    return yield this.store.findAll('model');
  }).cancelOn('deactivate').restartable(),

Array.prototype.slice.call(scope.getElementsByTagName(tag)).filter(el => el.textContent.trim() === text);

sinon.stub(ENV, 'APP').value({ infiniteScrollPageSize: pageSize });
assert.po(showPage.navLinks.links.findOneBy('text', 'Questions')).hasActiveStyling();

1 < 2 < 3;
true
3 > 2 > 1;
false
typeof [];
"object"
typeof null;
"object"
[] instanceof Object;
true
null instanceof Object;
false
NaN === NaN;
false

new URLSearchParams(new URL(window.location).search).get(param);

willDestroyElement() {
  this.set('isAnimated', false);
  let clone = this.get('element').parentNode.cloneNode(true);
  let popup = clone.querySelector('.popup-wrapper');
  popup.classList.remove('popup-wrapper--on-opening');
  popup.classList.add('popup-wrapper--on-closing');
  document.querySelector('body').append(clone);
  later(() => { clone.remove() }, this.get('animationTime'));
},


if (!overlay.animate) { return; }

  _unfilter(array, callback) {
    return array.filter(function () {
      return !callback.apply(this, arguments);
    });
  }
  
this.get('request').put(
  `/url`,
  { body: JSON.stringify(data) }
).then(response => {
  if (response.ok) {
    return response.json().then(json => {
      resolve(this.get('store').pushPayload(json));
    });
  } else if (response.code === 422) {
    return response.json().then(json => reject(json));
  } else {
    reject();
  }
});

# ember focus magic
becomeFocused: function() {
  this.$('.create-new-submission-method-input').focus();
}.on('didInsertElement'),
  
assert.dom('.navbar-blue li a[href*="/school/homeworks/calendar"]').hasText('Calendar');
assert.ok(/invalid format/i.test(find('#pin-only-form').text()), 'An error message appears');

server.db.employees.where({ employee_type: 'teacher' }).length

Object.entries(errors).length

random template (Handlebars.compile(.html())-> components

url = new URL('http://example:8080/path')
url.hostname  // "example"
url.host      // "example:8080"

CSS

  white-space: pre-wrap

  $p: &;
  .only-one-element {
    @at-root #{$p} {
      left: 25%;
    }
  }
  
  // .centered
  display: flex; justify-content: center; align-items: center; on the parent element
  
  .centered {
    left: 50%;
    margin: 0;
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
  }

yarn add [package]@[version]

javascript

function test(){
   alert( this instanceof test );
}
test();     // сработает как alert( false );
new test(); // сработает как alert( true );

// all available methods
Object.getOwnPropertyNames()

  moment.unix(retry[0]).format('YYYY-MM-DD HH:mm')
  
  function resolveAfter2Seconds() {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('resolved');
    }, 2000);
  });
}

async function asyncCall() {
  console.log('calling');
  var result = await resolveAfter2Seconds();
  console.log(result);
  // expected output: 'resolved'
}

asyncCall();


  pauseTest();
  
async function unicorn() {
  try {
    let rainbow = await getRainbow();
    return rainbow.data.colors;
  } catch(e) {
    return {
      message: e.data.message,
      somaText: ‘Текст о не легкой жизни единорогов’
    }
  }
}

async function unicorn() {
  let [rainbow, food] = await Promise.all([getRainbow(), getFood()]);
  return {rainbow, food}
}

class FakeIssuedOnModel {
  constructor(issuedOn) {
    this.issuedOn = issuedOn;
  }

  get(name) {
    return this[name];
  }
}

# times
[...Array(aspectsSize).keys()].forEach(function(size) {
  // size
});

import ObjectProxy from '@ember/object/proxy';

[class*="button--active"]

cypress
npm install --unsafe-perm=true --allow-root

ember generate component-class rental