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    <div class="container">
        <header class="jumbotron mt-4">
            <div class="display-2 mb-4">Our Mission</div>
            <p class="lead">Wisdom Pet Medicine strives to blend the best in
                traditional and alternative medicine in the diagnosis and
                treatment of companion animals including dogs, cats, birds,
                reptiles, rodents, and fish. We apply the wisdom garnered in
                the centuries old tradition of veterinary medicine, to find the
                safest treatments and cures.</p>
        </header>

    <header class="jumbotron jumbotron-fluid">
        <div class="container">
            <div class="display-2 mb-4">Our Mission</div>
            <p class="lead">Wisdom Pet Medicine strives to blend the best in
                traditional and alternative medicine in the diagnosis and
                treatment of companion animals including dogs, cats, birds,
                reptiles, rodents, and fish. We apply the wisdom garnered in
                the centuries old tradition of veterinary medicine, to find the
                safest treatments and cures.</p>
        </div>
    </header>

<table class="table table-striped table-hover table-bordered table-responsive">
  <thead class="thead-light">

<tr class="bg-danger text-light">

<td class="table-success">$100.00 </td>

        <section class="card mb-5" id="drwinthrop">
            <div class="card-body">
                <img class="card-img img-fluid" src="images/testimonial-mcphersons.jpg"
                    alt="Doctor Winthrop Photo">
                <h2 class="card-title">Dr. Stanley Winthrop</h2>
                <h5 class="card-subtitle">Behaviorist</h5>
                <p class="card-text">Dr. Winthrop is the guardian of Missy, a
                    three-year old Llaso mix, who he adopted at the shelter.
                    Dr. Winthrop is passionate about spay and neuter and pet
                    adoption, and works tireless hours outside the clinic,
                    performing free spay and neuter surgeries for the shelter.</p>
                <a class="card-link" href="#">About Me</a>
                <a class="card-link" href="#">My Pets</a>
                <a class="card-link" href="#">Client Slideshow</a>
            </div>
        </section>

<section class="card mb-5 bg-primary text-light border-warning" id="drchase">

        <section class="card mb-5" id="drsanders">
            <div class="card-header">
                <h2 class="card-title">Dr. Kenneth Sanders</h2>
                <h5 class="card-subtitle">Nutritionist</h5>
            </div>
            <div class="card-body">
                <img class="card-img img-fluid" src="images/testimonial-mcphersons.jpg"
                    alt="Doctor Sanders Photo">
                <p class="card-text">Leroy walked into Dr. Sanders front door
                    when she was moving into a new house. After searching for
                    weeks for Leroy's guardians, she decided to make Leroy a
                    part of her pet family, and now has three cats.</p>
            </div>
            <div class="card-footer">
                <a class="card-link" href="#">About Me</a>
                <a class="card-link" href="#">My Pets</a>
                <a class="card-link" href="#">Client Slideshow</a>
            </div>
        </section>

        <section class="card mb-5" id="drwong">
            <div class="card-body">
                <img class="card-img img-fluid" src="images/testimonial-mcphersons.jpg"
                    alt="Doctor Wong Photo">
                <h2 class="card-title">Dr. Olivia Wong</h2>
                <h5 class="card-subtitle">Preventive Care</h5>
                <p class="card-text">Dr. Wong is a cancer survivor who was
                    fortunate enough to get to spend time with a therapy dog
                    during her recovery. She became passionate about therapy
                    animals, and has started her own foundation to train and
                    provide education to patients in recovery. Now she gets her
                    own dose of daily therapy from her husky, Lilla.</p>
            </div>
            <div class="list-group list-group-flush">
                <a class="list-group-item" href="#">About Me</a>
                <a class="list-group-item" href="#">My Pets</a>
                <a class="list-group-item" href="#">
                    Client Slideshow
                </a>
            </div>
        </section>

    <div class="container">
        <div class="card-group">

<body>
    <div class="container">
        <section class="media mb-5" id="drwinthrop">
            <img class="d-flex align-self-center img-fluid rounded mr-3" style="width:30%"
                src="images/testimonial-mcphersons.jpg" alt="Doctor Winthrop Photo">
            <div class="media-body">
                <h2>Dr. Stanley Winthrop</h2>
                <h5>Behaviorist</h5>
                <p>Dr. Winthrop is the guardian of Missy,
                    a three-year old Llaso mix, who he adopted at the
                    shelter. Dr. Winthrop is passionate about spay and neuter
                    and pet adoption, and works tireless hours outside the
                    clinic, performing free spay and neuter surgeries for the
                    shelter.</p>
        </section>
    </div>
</body>

import { decorate } from "mobx";

class Count {
  value = 0;
}

decorate(Count, { value: observable });
const count = new Count();

const text = observable({
  value: "Hello world!",
  get uppercase() {
    return this.value.toUpperCase();
  }
});

> create-react-app state-management-with-mobx-part3
> cd state-management-with-mobx-part3
> npm start

> npm install --save mobx

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>MobX Basics, part 3</title>
    <meta charset="UTF-8" />
    <link href="src/styles.css" />
  </head>

  <body>
    <main>
      <input id="text-input" />
      <p id="text-display"></p>
      <p id="text-display-uppercase"></p>
    </main>

    <script src="src/index.js"></script>
  </body>
</html>

import { autorun, computed, observable } from "mobx";

const input = document.getElementById("text-input");
const textDisplay = document.getElementById("text-display");
const loudDisplay = document.getElementById("text-display-uppercase");

class Text {
  @observable value = "Hello World";
  @computed get uppercase() {
    return this.value.toUpperCase();
  }
}

const text = new Text();

input.addEventListener("keyup", event => {
  text.value = event.target.value;
});

autorun(() => {
  input.value = text.value;
  textDisplay.textContent = text.value;
  loudDisplay.textContent = text.uppercase;
});

./src/index.js
SyntaxError: \src\index.js: Support for the experimental syntax 'decorators-legacy' isn't currently enabled (8:3):

   6 | 
   7 | class Text {
>  8 |   @observable value = "Hello World";
     |   ^
   9 |   @computed get uppercase() {
  10 |     return this.value.toUpperCase();
  11 |   }

import { observable, computed, action } from "mobx";

class Timer {
  @observable start = Date.now();
  @observable current = Date.now();

  @computed
  get elapsedTime() {
    return this.current - this.start + "milliseconds";
  }

  @action
  tick() {
    this.current = Date.now();
  }
}

import { observable, computed, action, decorate } from "mobx";

class Timer {
  start = Date.now();
  current = Date.now();

  get elapsedTime() {
    return this.current - this.start + "milliseconds";
  }

  tick() {
    this.current = Date.now();
  }
}

decorate(Timer, {
  start: observable,
  current: observable,
  elapsedTime: computed,
  tick: action
});

const Counter = observer(({ count }) => {
  return (
   // ...
  );
});

> create-react-app my-proj1 --typescript

{
  "compilerOptions": {
    // ...
    "experimentalDecorators": true
  }
}

> npm i --save-dev customize-cra react-app-rewired

const {
  override,
  addDecoratorsLegacy,
  disableEsLint
} = require("customize-cra");

module.exports = override(
  // enable legacy decorators babel plugin
  addDecoratorsLegacy(),

  // disable eslint in webpack
  disableEsLint()
);

  "scripts": {
    "start": "react-app-rewired start",
    "build": "react-app-rewired build",
    "test": "react-app-rewired test",
    "eject": "react-app-rewired eject"
  },

{
  "extends": "react-app",
  "parserOptions": {
    "ecmaFeatures": {
      "legacyDecorators": true
    }
  }
}

const {
  override,
  addDecoratorsLegacy,
  useEslintRc
} = require("customize-cra");

module.exports = override(
  addDecoratorsLegacy(),
  useEslintRc(".eslintrc.json")
);

Experimental support for decorators is a feature that is subject to change in a future release.
Set the 'experimentalDecorators' option in your 'tsconfig' or 'jsconfig' to remove this warning.ts(1219)

{
    "compilerOptions": {
        "experimentalDecorators": true,
        "allowJs": true
    }
}