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decorate-angular-cli.js
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decorate-angular-cli.js
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/**
* 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('@nrwl/workspace').output;
} catch (e) {
console.warn('Angular CLI could not be decorated to enable computation caching. Please ensure @nrwl/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('nx/src/adapter/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' });
}