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export enum FAIconName {
    glass,
    music,
    search,
    envelopeAlt,
    heart,
    star,
    starEmpty,
    user,
    film,

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function toInt(str: string): { valid: boolean, int?: number } {
  const int = parseInt(str);
  if (isNaN(int)) {
    return { valid: false };
  }
  else {
    return { valid: true, int };
  }
}

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function toInt(str:string){
  return str ? parseInt(str) : undefined;
}

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interface Foo {
 a: number;
 b?: number;
}
var foo: Foo = {
  a: 123
}; // Don't set `b` to anything.

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fs.readFile('someFile', 'utf8', (err,data) => {
  if (err) {
    // do something
  }
  // no error
});

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14007 verbose request using bearer token for auth
14008 verbose etag "9UYOOOWNVI5L8X8INS4P8Z6ZP"
14009 http request GET https://registry.npmjs.org/object-keys
14010 http 304 https://registry.npmjs.org/object-keys
14011 verbose headers { 'cache-control': 'max-age=300',
14011 verbose headers   'accept-ranges': 'bytes',
14011 verbose headers   date: 'Sun, 21 Feb 2016 02:45:21 GMT',
14011 verbose headers   via: '1.1 varnish',
14011 verbose headers   connection: 'keep-alive',
14011 verbose headers   'x-served-by': 'cache-mel6521-MEL',

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class SelfFocusingInput extends React.Component<{ value: string, onChange: (value: string) => any }, {}>{
    ctrls: {
        input?: HTMLInputElement;
    } = {};
    render() {
        return (
            <input
                ref={(input) => this.ctrls.input = input}
                value={this.props.value}
                onChange={(e) => { this.props.onChange(this.ctrls.input.value) } }

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    /**
     * For `number` we assume pixels e.g. 5 => '5px'
     * For `string` you should provide the unit e.g. '5px'
     */
    type BoxUnit = number | string;
    function boxUnitToString(value: BoxUnit): string {
        if (typeof value === 'number') {
            return value.toString() + 'px';
        }
        else {

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    type PaddingUnit = number | string;
    export function padding(all: PaddingUnit);
    export function padding(topAndBottom: PaddingUnit, leftAndRight: PaddingUnit);
    export function padding(top: PaddingUnit, right: PaddingUnit, bottom: PaddingUnit, left: PaddingUnit);
    export function padding(a: PaddingUnit, b?: PaddingUnit, c?: PaddingUnit, d?: PaddingUnit) {
        if (!b && !c && !d) {
            b = c = d = a;
        }
        else if (!c && !d) {
            c = a;

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    type PaddingUnit = number | string;
    export function padding(a: PaddingUnit, b?: PaddingUnit, c?: PaddingUnit, d?: PaddingUnit) {
        if (!b && !c && !d) {
            b = c = d = a;
        }
        else if (!c && !d) {
            c = a;
            d = b;
        }
        return {