Angular Apps Loading

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Here, we are using the app named “firstapp” that we previously created. All the code from the app.component.html file needs to be replaced with some basic HTML code.

Original code:

app.component.html:

<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
<!-- * * * * * * * * * * * The content below * * * * * * * * * * * -->
<!-- * * * * * * * * * * is only a placeholder * * * * * * * * * * -->
<!-- * * * * * * * * * * and can be replaced. * * * * * * * * * * * -->
<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
<!-- * * * * * * * * * Delete the template below * * * * * * * * * * -->
<!-- * * * * * * * to get started with your project! * * * * * * * * -->
<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
 
<style>
  :host {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    font-size: 14px;
    color: #333;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
 
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    margin: 8px 0;
  }
 
  p {
    margin: 0;
  }
 
  .spacer {
    flex: 1;
  }
 
  .toolbar {
    height: 60px;
    margin: -8px;
    display: flex;
    align-items: center;
    background-color: #1976d2;
    color: white;
    font-weight: 600;
  }
 
  .toolbar img {
    margin: 0 16px;
  }
 
  .toolbar #twitter-logo {
    height: 40px;
    margin: 0 16px;
  }
 
  .toolbar #twitter-logo:hover {
    opacity: 0.8;
  }
 
  .content {
    display: flex;
    margin: 32px auto;
    padding: 0 16px;
    max-width: 960px;
    flex-direction: column;
    align-items: center;
  }
 
  svg.material-icons {
    height: 24px;
    width: auto;
  }
 
  svg.material-icons:not(:last-child) {
    margin-right: 8px;
  }
 
  .card svg.material-icons path {
    fill: #888;
  }
 
  .card-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 16px;
  }
 
  .card {
    border-radius: 4px;
    border: 1px solid #eee;
    background-color: #fafafa;
    height: 40px;
    width: 200px;
    margin: 0 8px 16px;
    padding: 16px;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    transition: all 0.2s ease-in-out;
    line-height: 24px;
  }
 
  .card-container .card:not(:last-child) {
    margin-right: 0;
  }
 
  .card.card-small {
    height: 16px;
    width: 168px;
  }
 
  .card-container .card:not(.highlight-card) {
    cursor: pointer;
  }
 
  .card-container .card:not(.highlight-card):hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 17px rgba(black, 0.35);
  }
 
  .card-container .card:not(.highlight-card):hover .material-icons path {
    fill: rgb(105, 103, 103);
  }
 
  .card.highlight-card {
    background-color: #1976d2;
    color: white;
    font-weight: 600;
    border: none;
    width: auto;
    min-width: 30%;
    position: relative;
  }
 
  .card.card.highlight-card span {
    margin-left: 60px;
  }
 
  svg#rocket {
    width: 80px;
    position: absolute;
    left: -10px;
    top: -24px;
  }
 
  svg#rocket-smoke {
    height: 100vh;
    position: absolute;
    top: 10px;
    right: 180px;
    z-index: -10;
  }
 
  a,
  a:visited,
  a:hover {
    color: #1976d2;
    text-decoration: none;
  }
 
  a:hover {
    color: #125699;
  }
 
  .terminal {
    position: relative;
    width: 80%;
    max-width: 600px;
    border-radius: 6px;
    padding-top: 45px;
    margin-top: 8px;
    overflow: hidden;
    background-color: rgb(15, 15, 16);
  }
 
  .terminal::before {
    content: "\2022 \2022 \2022";
    position: absolute;
    top: 0;
    left: 0;
    height: 4px;
    background: rgb(58, 58, 58);
    color: #c2c3c4;
    width: 100%;
    font-size: 2rem;
    line-height: 0;
    padding: 14px 0;
    text-indent: 4px;
  }
 
  .terminal pre {
    font-family: SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;
    color: white;
    padding: 0 1rem 1rem;
    margin: 0;
  }
 
  .circle-link {
    height: 40px;
    width: 40px;
    border-radius: 40px;
    margin: 8px;
    background-color: white;
    border: 1px solid #eeeeee;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    transition: 1s ease-out;
  }
 
  .circle-link:hover {
    transform: translateY(-0.25rem);
    box-shadow: 0px 3px 15px rgba(0, 0, 0, 0.2);
  }
 
  footer {
    margin-top: 8px;
    display: flex;
    align-items: center;
    line-height: 20px;
  }
 
  footer a {
    display: flex;
    align-items: center;
  }
 
  .github-star-badge {
    color: #24292e;
    display: flex;
    align-items: center;
    font-size: 12px;
    padding: 3px 10px;
    border: 1px solid rgba(27,31,35,.2);
    border-radius: 3px;
    background-image: linear-gradient(-180deg,#fafbfc,#eff3f6 90%);
    margin-left: 4px;
    font-weight: 600;
    font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol;
  }
 
  .github-star-badge:hover {
    background-image: linear-gradient(-180deg,#f0f3f6,#e6ebf1 90%);
    border-color: rgba(27,31,35,.35);
    background-position: -.5em;
  }
 
  .github-star-badge .material-icons {
    height: 16px;
    width: 16px;
    margin-right: 4px;
  }
 
  svg#clouds {
    position: fixed;
    bottom: -160px;
    left: -230px;
    z-index: -10;
    width: 1920px;
  }
 
 
  /* Responsive Styles */
  @media screen and (max-width: 767px) {
 
    .card-container > *:not(.circle-link) ,
    .terminal {
      width: 100%;
    }
 
    .card:not(.highlight-card) {
      height: 16px;
      margin: 8px 0;
    }
 
    .card.highlight-card span {
      margin-left: 72px;
    }
 
    svg#rocket-smoke {
      right: 120px;
      transform: rotate(-5deg);
    }
  }
 
  @media screen and (max-width: 575px) {
    svg#rocket-smoke {
      display: none;
      visibility: hidden;
    }
  }
</style>
 
<!-- Toolbar -->
<div class="toolbar" role="banner">
  <img
    width="40"
    alt="Angular Logo"
    src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNTAgMjUwIj4KICAgIDxwYXRoIGZpbGw9IiNERDAwMzEiIGQ9Ik0xMjUgMzBMMzEuOSA2My4ybDE0LjIgMTIzLjFMMTI1IDIzMGw3OC45LTQzLjcgMTQuMi0xMjMuMXoiIC8+CiAgICA8cGF0aCBmaWxsPSIjQzMwMDJGIiBkPSJNMTI1IDMwdjIyLjItLjFWMjMwbDc4LjktNDMuNyAxNC4yLTEyMy4xTDEyNSAzMHoiIC8+CiAgICA8cGF0aCAgZmlsbD0iI0ZGRkZGRiIgZD0iTTEyNSA1Mi4xTDY2LjggMTgyLjZoMjEuN2wxMS43LTI5LjJoNDkuNGwxMS43IDI5LjJIMTgzTDEyNSA1Mi4xem0xNyA4My4zaC0zNGwxNy00MC45IDE3IDQwLjl6IiAvPgogIDwvc3ZnPg=="
  />
  <span>Welcome</span>
    <div class="spacer"></div>
  <a aria-label="Angular on twitter" target="_blank" rel="noopener noreferrer" href="https://twitter.com/angular" title="Twitter">
 
    <svg id="twitter-logo" height="24" data-name="Logo — FIXED" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400">
      <defs>
        <style>
          .cls-1 {
            fill: none;
          }
 
          .cls-2 {
            fill: #ffffff;
          }
        </style>
      </defs>
      <rect class="cls-1" width="400" height="400" />
      <path class="cls-2" d="M153.62,301.59c94.34,0,145.94-78.16,145.94-145.94,0-2.22,0-4.43-.15-6.63A104.36,104.36,0,0,0,325,122.47a102.38,102.38,0,0,1-29.46,8.07,51.47,51.47,0,0,0,22.55-28.37,102.79,102.79,0,0,1-32.57,12.45,51.34,51.34,0,0,0-87.41,46.78A145.62,145.62,0,0,1,92.4,107.81a51.33,51.33,0,0,0,15.88,68.47A50.91,50.91,0,0,1,85,169.86c0,.21,0,.43,0,.65a51.31,51.31,0,0,0,41.15,50.28,51.21,51.21,0,0,1-23.16.88,51.35,51.35,0,0,0,47.92,35.62,102.92,102.92,0,0,1-63.7,22A104.41,104.41,0,0,1,75,278.55a145.21,145.21,0,0,0,78.62,23"
      />
    </svg>
 
  </a>
</div>
 
<div class="content" role="main">
 
  <!-- Highlight Card -->
  <div class="card highlight-card card-small">
 
    <svg id="rocket" alt="Rocket Ship" xmlns="http://www.w3.org/2000/svg" width="101.678" height="101.678" viewBox="0 0 101.678 101.678">
      <g id="Group_83" data-name="Group 83" transform="translate(-141 -696)">
        <circle id="Ellipse_8" data-name="Ellipse 8" cx="50.839" cy="50.839" r="50.839" transform="translate(141 696)" fill="#dd0031"/>
        <g id="Group_47" data-name="Group 47" transform="translate(165.185 720.185)">
          <path id="Path_33" data-name="Path 33" d="M3.4,42.615a3.084,3.084,0,0,0,3.553,3.553,21.419,21.419,0,0,0,12.215-6.107L9.511,30.4A21.419,21.419,0,0,0,3.4,42.615Z" transform="translate(0.371 3.363)" fill="#fff"/>
          <path id="Path_34" data-name="Path 34" d="M53.3,3.221A3.09,3.09,0,0,0,50.081,0,48.227,48.227,0,0,0,18.322,13.437c-6-1.666-14.991-1.221-18.322,7.218A33.892,33.892,0,0,1,9.439,25.1l-.333.666a3.013,3.013,0,0,0,.555,3.553L23.985,43.641a2.9,2.9,0,0,0,3.553.555l.666-.333A33.892,33.892,0,0,1,32.647,53.3c8.55-3.664,8.884-12.326,7.218-18.322A48.227,48.227,0,0,0,53.3,3.221ZM34.424,9.772a6.439,6.439,0,1,1,9.106,9.106,6.368,6.368,0,0,1-9.106,0A6.467,6.467,0,0,1,34.424,9.772Z" transform="translate(0 0.005)" fill="#fff"/>
        </g>
      </g>
    </svg>
 
    <span>{{ title }} app is running!</span>
 
    <svg id="rocket-smoke" alt="Rocket Ship Smoke" xmlns="http://www.w3.org/2000/svg" width="516.119" height="1083.632" viewBox="0 0 516.119 1083.632">
      <path id="Path_40" data-name="Path 40" d="M644.6,141S143.02,215.537,147.049,870.207s342.774,201.755,342.774,201.755S404.659,847.213,388.815,762.2c-27.116-145.51-11.551-384.124,271.9-609.1C671.15,139.365,644.6,141,644.6,141Z" transform="translate(-147.025 -140.939)" fill="#f5f5f5"/>
    </svg>
 
  </div>
 
  <!-- Resources -->
  <h2>Resources</h2>
  <p>Here are some links to help you get started:</p>
 
  <div class="card-container">
    <a class="card" target="_blank" rel="noopener noreferrer" href="https://angular.io/tutorial">
      <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M5 13.18v4L12 21l7-3.82v-4L12 17l-7-3.82zM12 3L1 9l11 6 9-4.91V17h2V9L12 3z"/></svg>
 
      <span>Learn Angular</span>
 
      <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg>    </a>
 
    <a class="card" target="_blank" rel="noopener noreferrer" href="https://angular.io/cli">
      <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M9.4 16.6L4.8 12l4.6-4.6L8 6l-6 6 6 6 1.4-1.4zm5.2 0l4.6-4.6-4.6-4.6L16 6l6 6-6 6-1.4-1.4z"/></svg>
 
      <span>CLI Documentation</span>
 
      <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg>
    </a>
 
    <a class="card" target="_blank" rel="noopener noreferrer" href="https://blog.angular.io">
      <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M13.5.67s.74 2.65.74 4.8c0 2.06-1.35 3.73-3.41 3.73-2.07 0-3.63-1.67-3.63-3.73l.03-.36C5.21 7.51 4 10.62 4 14c0 4.42 3.58 8 8 8s8-3.58 8-8C20 8.61 17.41 3.8 13.5.67zM11.71 19c-1.78 0-3.22-1.4-3.22-3.14 0-1.62 1.05-2.76 2.81-3.12 1.77-.36 3.6-1.21 4.62-2.58.39 1.29.59 2.65.59 4.04 0 2.65-2.15 4.8-4.8 4.8z"/></svg>
 
      <span>Angular Blog</span>
 
      <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg>
    </a>
 
  </div>
 
  <!-- Next Steps -->
  <h2>Next Steps</h2>
  <p>What do you want to do next with your app?</p>
 
  <input type="hidden" #selection>
 
  <div class="card-container">
    <div class="card card-small" (click)="selection.value = 'component'" tabindex="0">
        <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg>
 
      <span>New Component</span>
    </div>
 
    <div class="card card-small" (click)="selection.value = 'material'" tabindex="0">
        <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg>
 
      <span>Angular Material</span>
    </div>
 
    <div class="card card-small" (click)="selection.value = 'dependency'" tabindex="0">
      <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg>
 
      <span>Add Dependency</span>
    </div>
 
    <div class="card card-small" (click)="selection.value = 'test'" tabindex="0">
      <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg>
 
      <span>Run and Watch Tests</span>
    </div>
 
    <div class="card card-small" (click)="selection.value = 'build'" tabindex="0">
      <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg>
 
      <span>Build for Production</span>
    </div>
  </div>
 
  <!-- Links -->
  <div class="card-container">
    <a class="circle-link" title="Animations" href="https://angular.io/guide/animations" target="_blank" rel="noopener noreferrer">
      <svg id="Group_20" data-name="Group 20" xmlns="http://www.w3.org/2000/svg" width="21.813" height="23.453" viewBox="0 0 21.813 23.453">
        <path id="Path_15" data-name="Path 15" d="M4099.584,972.736h0l-10.882,3.9,1.637,14.4,9.245,5.153,9.245-5.153,1.686-14.4Z" transform="translate(-4088.702 -972.736)" fill="#ffa726"/>
        <path id="Path_16" data-name="Path 16" d="M4181.516,972.736v23.453l9.245-5.153,1.686-14.4Z" transform="translate(-4170.633 -972.736)" fill="#fb8c00"/>
        <path id="Path_17" data-name="Path 17" d="M4137.529,1076.127l-7.7-3.723,4.417-2.721,7.753,3.723Z" transform="translate(-4125.003 -1058.315)" fill="#ffe0b2"/>
        <path id="Path_18" data-name="Path 18" d="M4137.529,1051.705l-7.7-3.723,4.417-2.721,7.753,3.723Z" transform="translate(-4125.003 -1036.757)" fill="#fff3e0"/>
        <path id="Path_19" data-name="Path 19" d="M4137.529,1027.283l-7.7-3.723,4.417-2.721,7.753,3.723Z" transform="translate(-4125.003 -1015.199)" fill="#fff"/>
      </svg>
    </a>
 
    <a class="circle-link" title="CLI" href="https://cli.angular.io/" target="_blank" rel="noopener noreferrer">
      <svg alt="Angular CLI Logo" xmlns="http://www.w3.org/2000/svg" width="21.762" height="23.447" viewBox="0 0 21.762 23.447">
        <g id="Group_21" data-name="Group 21" transform="translate(0)">
          <path id="Path_20" data-name="Path 20" d="M2660.313,313.618h0l-10.833,3.9,1.637,14.4,9.2,5.152,9.244-5.152,1.685-14.4Z" transform="translate(-2649.48 -313.618)" fill="#37474f"/>
          <path id="Path_21" data-name="Path 21" d="M2741.883,313.618v23.447l9.244-5.152,1.685-14.4Z" transform="translate(-2731.05 -313.618)" fill="#263238"/>
          <path id="Path_22" data-name="Path 22" d="M2692.293,379.169h11.724V368.618h-11.724Zm11.159-.6h-10.608v-9.345h10.621v9.345Z" transform="translate(-2687.274 -362.17)" fill="#fff"/>
          <path id="Path_23" data-name="Path 23" d="M2709.331,393.688l.4.416,2.265-2.28-2.294-2.294-.4.4,1.893,1.893Z" transform="translate(-2702.289 -380.631)" fill="#fff"/>
          <rect id="Rectangle_12" data-name="Rectangle 12" width="3.517" height="0.469" transform="translate(9.709 13.744)" fill="#fff"/>
        </g>
      </svg>
    </a>
 
    <a class="circle-link" title="Augury" href="https://augury.rangle.io/" target="_blank" rel="noopener noreferrer">
      <svg alt="Angular Augury Logo" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="21.81" height="23.447" viewBox="0 0 21.81 23.447">
        <defs>
          <clipPath id="clip-path">
            <rect id="Rectangle_13" data-name="Rectangle 13" width="10.338" height="10.27" fill="none"/>
          </clipPath>
        </defs>
        <g id="Group_25" data-name="Group 25" transform="translate(0)">
          <path id="Path_24" data-name="Path 24" d="M3780.155,311.417h0l-10.881,3.9,1.637,14.4,9.244,5.152,9.244-5.152,1.685-14.4Z" transform="translate(-3769.274 -311.417)" fill="#4a3493"/>
          <path id="Path_25" data-name="Path 25" d="M3862.088,311.417v23.447l9.244-5.152,1.685-14.4Z" transform="translate(-3851.207 -311.417)" fill="#311b92"/>
          <g id="Group_24" data-name="Group 24" transform="translate(6.194 6.73)" opacity="0.5">
            <g id="Group_23" data-name="Group 23" transform="translate(0 0)">
              <g id="Group_22" data-name="Group 22" clip-path="url(#clip-path)">
                <path id="Path_26" data-name="Path 26" d="M3832.4,373.252a5.168,5.168,0,1,1-5.828-4.383,5.216,5.216,0,0,1,2.574.3,3.017,3.017,0,1,0,3.252,4.086Z" transform="translate(-3822.107 -368.821)" fill="#fff"/>
              </g>
            </g>
          </g>
          <path id="Path_27" data-name="Path 27" d="M3830.582,370.848a5.162,5.162,0,1,1-3.254-4.086,3.017,3.017,0,1,0,3.252,4.086Z" transform="translate(-3814.311 -359.969)" fill="#fff"/>
        </g>
      </svg>
    </a>
 
    <a class="circle-link" title="Protractor" href="https://www.protractortest.org/" target="_blank" rel="noopener noreferrer">
      <svg alt="Angular Protractor Logo" xmlns="http://www.w3.org/2000/svg" width="21.81" height="23.447" viewBox="0 0 21.81 23.447">
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<router-outlet></router-outlet>

Replaced code:

app.component.html:

<h3>First angular application</h3>

Output:

Explanation:

In the above example, we replaced the code of the app.component.html file. The output so obtained can be checked on the browser by running the “ng serve” command in the command prompt. Before running the “ng serve” command, go inside the “firstapp” folder by using “cd firstapp” command.

The server served an index.html file, and not the above file. To create “Single Page Applications”, Angular is used as a framework. The single-page provided by the server is what index.html file is.

index.html:

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Firstapp</title>
  <base href="">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
</head>
<body>
  <app-root></app-root>
</body>
</html>

Explanation:

The <title> tag in the above HTML code represents the same title in the browser as the name of the app. The <body> code is however not the same as a normal HTML code. The “<app-root>” tag is provided by the CLI. By default, the app component is created whenever a project from CLI is created.

app.component.ts:

import { Component } from '@angular/core';
 
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'firstapp';
}

Explanation:

The above file is a TypeScript file, where the “selector” property is used. The string as index.html file is included in the selector property. The Angular uses this information to place this part into an index.html file with the template of the component. The Angular includes the “./app.component.html” into the body of the index.html file because it is the template of the component. Thus an “app-root” is included in the index.html file in this way.

How does Angular trigger?

The ng-serve creates “bundles” while building an application. These bundles are automatically added to the index.html file at runtime by the ng-serve. The first code from these bundles is to be executed from the main file from where the execution of an Angular application starts i.e., “main.ts” file.

main.ts file:

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
 
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
 
if (environment.production) {
  enableProdMode();
}
 
platformBrowserDynamic().bootstrapModule(AppModule)
  .catch(err => console.error(err));

Explanation:

In the above angular code, the bootstrap method starts the Angular application which refers to the AppModule. It looks into the app folders.

app.module.ts file:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
 
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
 
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Explanation:

In the above file, a bootstrap array analyzes the index.html file. Here, the bootstrap array is a list of all the components.

Thus, an Angular application gets loaded as:

main.ts >> app.Module.ts >> app.component.ts >> index.html >> app.component.html