/**

* This file decorates the Angular CLI with the Nx CLI to enable features such as computation caching

* and faster execution of tasks.

*

* It does this by:

*

* - Patching the Angular CLI to warn you in case you accidentally use the undecorated ng command.

* - Symlinking the ng to nx command, so all commands run through the Nx CLI

* - Updating the package.json postinstall script to give you control over this script

*

* The Nx CLI decorates the Angular CLI, so the Nx CLI is fully compatible with it.

* Every command you run should work the same when using the Nx CLI, except faster.

*

* Because of symlinking you can still type `ng build/test/lint` in the terminal. The ng command, in this case,

* will point to nx, which will perform optimizations before invoking ng. So the Angular CLI is always invoked.

* The Nx CLI simply does some optimizations before invoking the Angular CLI.

*

* To opt out of this patch:

* - Replace occurrences of nx with ng in your package.json

* - Remove the script from your postinstall script in your package.json

* - Delete and reinstall your node_modules

*/

const fs = require('fs');

const os = require('os');

const cp = require('child_process');

const isWindows = os.platform() === 'win32';

let output;

try {

output = require('@nx/workspace').output;

} catch (e) {

console.warn(

'Angular CLI could not be decorated to enable computation caching. Please ensure @nx/workspace is installed.',

);

process.exit(0);

}

/**

* Symlink of ng to nx, so you can keep using `ng build/test/lint` and still

* invoke the Nx CLI and get the benefits of computation caching.

*/

function symlinkNgCLItoNxCLI() {

try {

const ngPath = './node_modules/.bin/ng';

const nxPath = './node_modules/.bin/nx';

if (isWindows) {

/**

* This is the most reliable way to create symlink-like behavior on Windows.

* Such that it works in all shells and works with npx.

*/

['', '.cmd', '.ps1'].forEach((ext) => {

if (fs.existsSync(nxPath + ext)) fs.writeFileSync(ngPath + ext, fs.readFileSync(nxPath + ext));

});

} else {

// If unix-based, symlink

cp.execSync(`ln -sf ./nx ${ngPath}`);

}

} catch (e) {

output.error({ title: 'Unable to create a symlink from the Angular CLI to the Nx CLI:' + e.message });

throw e;

}

}

try {

symlinkNgCLItoNxCLI();

require('@nrwl/cli/lib/decorate-cli').decorateCli();

output.log({ title: 'Angular CLI has been decorated to enable computation caching.' });

} catch (e) {

output.error({ title: 'Decoration of the Angular CLI did not complete successfully' });

}