| 1 | /**
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| 2 | * Copyright (c) Facebook, Inc. and its affiliates.
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| 3 | *
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| 4 | * This source code is licensed under the MIT license found in the
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| 5 | * LICENSE file in the root directory of this source tree.
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| 6 | *
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| 7 | */
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| 8 |
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| 9 | import {fetch} from './fetch';
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| 10 |
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| 11 | /**
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| 12 | * Indicates whether or not the packager is running. It returns a promise that
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| 13 | * returns one of these possible values:
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| 14 | * - `running`: the packager is running
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| 15 | * - `not_running`: the packager nor any process is running on the expected port.
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| 16 | * - `unrecognized`: one other process is running on the port we expect the packager to be running.
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| 17 | */
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| 18 | async function isPackagerRunning(
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| 19 | packagerPort: string | number = process.env.RCT_METRO_PORT || '8081',
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| 20 | ): Promise<'running' | 'not_running' | 'unrecognized'> {
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| 21 | try {
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| 22 | const {data} = await fetch(`http://localhost:${packagerPort}/status`);
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| 23 |
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| 24 | return data === 'packager-status:running' ? 'running' : 'unrecognized';
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| 25 | } catch (_error) {
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| 26 | return 'not_running';
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| 27 | }
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| 28 | }
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| 29 |
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| 30 | export default isPackagerRunning;
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