1 | import { fromEventPattern } from './fromeventpattern';
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2 | function isNodeEventEmitter(obj) {
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3 | return !!obj && typeof obj.addListener === 'function' && typeof obj.removeListener === 'function';
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4 | }
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5 | function isEventTarget(obj) {
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6 | return (!!obj &&
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7 | typeof obj.addEventListener === 'function' &&
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8 | typeof obj.removeEventListener === 'function');
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9 | }
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10 | export function fromEvent(obj, type, options) {
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11 | if (isEventTarget(obj)) {
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12 | const target = obj;
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13 | return fromEventPattern(h => target.addEventListener(type, h, options), h => target.removeEventListener(type, h, options));
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14 | }
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15 | else if (isNodeEventEmitter(obj)) {
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16 | const target = obj;
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17 | return fromEventPattern(h => target.addListener(type, h), h => target.removeListener(type, h));
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18 | }
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19 | else {
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20 | throw new TypeError('Unsupported event target');
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21 | }
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22 | }
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23 |
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24 |
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