## Current Behavior
Running Nx in multiple processes at the same time with the daemon
disabled can cripple a system due to excess memory usage when creating
the graph. This is due to plugin workers being started per-parent
process when there is no daemon. This change enables a file lock to
prevent the simultaneous processing, and read from the cache when the
first run completes.
Currently, running `nx show projects` 30 times in parallel looks
something like this:
30 processes exited within 37535ms
## Expected Behavior
30 processes exited within 6435ms
## Test Script
```js
//@ts-check
const { spawn } = require('child_process');
let alive = new Set();
let start = Date.now();
let iterations = 30;
for (let i = 0; i < iterations; i++) {
const cp = spawn('npx nx show projects', [], {
shell: true,
env: {
...process.env,
NX_DAEMON: 'false',
NX_VERBOSE_LOGGING: 'true',
},
});
alive.add(i);
// cp.stdout.on('data', (data) => {
// console.log(`stdout [${i}]: ${data}`);
// });
cp.stderr.on('data', (data) => {
console.error(`stderr [${i}]: ${data}`);
});
cp.on('exit', (code) => {
console.log(`child process ${i} exited with code ${code}`);
alive.delete(i);
});
}
const i = setInterval(() => {
if (alive.size > 0) {
} else {
clearInterval(i);
console.log(
`${iterations} processes exited within ${Date.now() - start}ms`
);
}
}, 1);
```
BREAKING CHANGE
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## Current Behavior
<!-- This is the behavior we have today -->
* `@nx/devkit` supports Nx 17 - 20.
* Node 18 - 22 is supported
* `ExecutorContext.projectGraph`, `ExecutorContext.nxJsonConfiguration`,
and `ExecutorContext.projectsConfigurations` is marked as optional
because `ExecutorContext` in some versions of Nx did not have them.
* `ExecutorContext.workspace` is marked as optional because
`ExecutorContext` in some versions of Nx did not have the above
properties which contain the same information.
* `ProjectGraphNode` is deprecated.
* `NxPluginV1.processProjectGraph` was deprecated long ago and there has
been a warning since.
* `appRootPath` has been deprecated for a long time.
* `parseTargetString` had a variant that did not take either the project
graph or the executor context.
* `readNxJson` has a variant which does not take a tree. This was not
clearly deprecated.
* There are handlers to require from `@nx/` instead of `@nrwl`
* Nx tries to get a root install from `@nrwl/cli`
## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->
* `@nx/devkit` supports Nx 19 - 21.
* Node 20 - 22 is supported
* `ExecutorContext.projectGraph`, `ExecutorContext.nxJsonConfiguration`,
and `ExecutorContext.projectsConfigurations` is marked as required
because `ExecutorContext` in Nx 19+ is guaranteed to have them.
* `ExecutorContext.workspace` is removed because the same information is
available in the above properties
* `ProjectGraphNode` is removed.
* `NxPluginV1` is no more. All plugins should be `NxPluginV2`.
* `workspaceRoot` is the replacement for `appRootPath`. `appRootPath` is
removed.
* `parseTargetString` no longer has a variant that did not take either
the project graph or the executor context.
* `readNxJson` still has a variant which does not take a tree but it's
clearly deprecated to be removed in Nx 21.
* `@nrwl` packages are no more so we don't have to redirect requires
anymore.
* `@nrwl/cli` is no more so Nx shouldn't try to get a root install there
*
## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->
Fixes #
