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import { Kind } from 'graphql';

function parseLiteral(value) {
  return ast.kind === Kind.BOOLEAN ? ast.value : undefined;
}

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function parseValue(value) {
  if (typeof value !== 'boolean') {
    throw new TypeError(
      `Boolean cannot represent a non boolean value: ${inspect(value)}`,
    );
  }
  return value;
}

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function serializeBoolean(value) {
  if (typeof value === 'boolean') {
    return value;
  }
  if (isFinite(value)) {
    return value !== 0;
  }
  throw new TypeError(
    `Boolean cannot represent a non boolean value: ${inspect(value)}`,
  );

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asciidoctor -d book -b docbook5 book.asciidoc -o output.docbook
pandoc -f docbook -t epub out.docbook -o book.epub

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const success = position => {
  const { latitude, longitude } = position.coords;
  console.log(`Your coordinates - ${latitude}lat and ${longitude}lng`);
};

const error = err => {
  console.log(err);
};

getCurrentPosition(success, error);

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const getLocation = () => new Promise((resolve, reject) => {
  const success = position => resolve(position);
  const error = error => reject(error);

  navigator.geolocation.getCurrentPosition(success, error);
})

try {
  const position = await getLocation();
  console.log(position);

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# set NODE_ENV
export NODE_ENV=production

# get NODE_ENV
echo $NODE_ENV

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STATE

• Inside store

state: {
  count: 0
}

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Handling Events

• React events are named using camelCase, rather than lowercase.
• With JSX you pass a function as the event handler, rather than a string.

<button onClick={activateLasers}>
  Activate Lasers
</button>

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// to set/create variable use export
export NODE_ENV=development

// to get variable use echo and $ prefix
echo $NODE_ENV
// will return 'development'