| 1 | const { Sema } = require('async-sema');
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| 2 | const EventedQueue = require('./evented-queue');
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| 3 |
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| 4 | module.exports = (tasks = [], concurrency = 1, preserveOrder = false) => {
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| 5 | const semaphore = new Sema(concurrency);
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| 6 | const queue = new EventedQueue();
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| 7 |
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| 8 | return Promise.all(
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| 9 | tasks.map(async ({ pkg, apply }) => {
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| 10 | queue.add(pkg.name);
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| 11 |
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| 12 | await semaphore.acquire();
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| 13 |
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| 14 |
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| 15 | if (preserveOrder) {
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| 16 | await queue.waitBehind(pkg.allDependencies);
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| 17 | }
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| 18 |
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| 19 | await apply();
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| 20 |
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| 21 | queue.delete(pkg.name);
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| 22 |
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| 23 | semaphore.release();
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| 24 | }),
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| 25 | );
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| 26 | };
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