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fix: Remove legacy spawnSync feature detection #87

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merged 1 commit into from
May 10, 2019

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demurgos
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@demurgos demurgos commented May 10, 2019

This commit removes the checks to detect and use spawnSync in Node <= 0.10. spawnSync is exposed since Node 0.11.

This commit removes the checks used to detect and use `spawnSync` in Node <= 0.10. `spawnSync` is exposed since Node 0.11.
@demurgos demurgos force-pushed the legacy-spawn-sync-check branch from 6f3f4c1 to f3fb337 Compare May 10, 2019 15:22
@bcoe bcoe merged commit 78777aa into istanbuljs:master May 10, 2019
try {
spawnSyncBinding = process.binding('spawn_sync')
} catch (e) {}
const spawnSyncBinding = process.binding('spawn_sync')
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Sorry I was out earlier didn't get a chance to review this. process.binding is silently deprecated in current versions of node.js, this change assumes it will never be removed. Is that a good idea?

// @bcoe @demurgos

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I remember reading about possible deprecations but haven't heard more about it. Do you know how soon it may be deprecated? Node 13? Node 14?

Generally, I don't like that this library use Node's internals and monkey-patches them because it is fragile and has bad encapsulation. It is possible to patch the spawn function at a higher level: I would prefer to move into this direction. The internal patching could be kept for the moment, but ultimately I'd like to deprecate it. This progression would be similar to graceful-fs: it initially patched Node's internals but then moved to an "external wrapper" design.

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process.binding hit 'documentation only' deprecation in 10.9.0. Since 11.12.0 it is a 'pending deprecation', so node --pending-deprecation will show a warning. I don't have any information on when it will be escalated to full deprecation. I raised this module as a potential issue at nodejs/node#27344. I'm not entirely sure the 'external wrapper' way of graceful-fs will really work, the idea is to 'hijack' calls to spawn / spawnSync. Maybe the NODE_OPTIONS environment will work, I haven't had a chance to give that much thought yet.

https://nodejs.org/dist/latest-v11.x/docs/api/deprecations.html#DEP0111

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Oh, thank you very much for the info: I wasn't aware that it already started being deprecated.

An external wrapper would be a function that changes the options and then passes them to require("child_process").spawn, without ever changing the internals. But it only solves the issue at the top level. To wrap processes deep in the process tree (and hooking into code you don't control) I still patch the internals.

It's a tough problem.

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I opened an issue to discuss this deprecation: #89

@demurgos demurgos deleted the legacy-spawn-sync-check branch May 21, 2019 20:47
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3 participants