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1 | /// <amd-module name="@angular/compiler-cli/ngcc/src/locking/sync_locker" />
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2 | /**
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3 | * @license
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4 | * Copyright Google LLC All Rights Reserved.
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5 | *
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6 | * Use of this source code is governed by an MIT-style license that can be
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7 | * found in the LICENSE file at https://angular.io/license
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8 | */
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9 | import { LockFile } from './lock_file';
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10 | /**
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11 | * SyncLocker is used to prevent more than one instance of ngcc executing at the same time,
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12 | * when being called in a synchronous context.
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13 | *
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14 | * * When ngcc starts executing, it creates a file in the `compiler-cli/ngcc` folder.
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15 | * * If it finds one is already there then it fails with a suitable error message.
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16 | * * When ngcc completes executing, it removes the file so that future ngcc executions can start.
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17 | */
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18 | export declare class SyncLocker {
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19 | private lockFile;
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20 | constructor(lockFile: LockFile);
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21 | /**
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22 | * Run the given function guarded by the lock file.
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23 | *
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24 | * @param fn the function to run.
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25 | * @returns the value returned from the `fn` call.
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26 | */
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27 | lock<T>(fn: () => T): T;
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28 | /**
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29 | * Write a lock file to disk, or error if there is already one there.
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30 | */
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31 | protected create(): void;
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32 | /**
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33 | * The lock-file already exists so raise a helpful error.
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34 | */
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35 | protected handleExistingLockFile(): void;
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36 | }
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