feat(js): add publish target and generate minimal publish script for …

…publishable libraries

packages/js/src/generators/library/library.spec.ts

@@ -794,5 +794,62 @@ describe('lib', () => {
         expect(tree.exists('libs/my-lib/package.json')).toBeTruthy();
       });
     });
+
+    describe('--publishable', () => {
+      it('should generate the build target', async () => {
+        await libraryGenerator(tree, {
+          ...defaultOptions,
+          name: 'myLib',
+          publishable: true,
+          importPath: '@proj/my-lib',
+          compiler: 'tsc',
+        });
+
+        const config = readProjectConfiguration(tree, 'my-lib');
+        expect(config.targets.build).toEqual({
+          executor: '@nrwl/js:tsc',
+          options: {
+            assets: ['libs/my-lib/*.md'],
+            main: 'libs/my-lib/src/index.ts',
+            outputPath: 'dist/libs/my-lib',
+            tsConfig: 'libs/my-lib/tsconfig.lib.json',
+          },
+          outputs: ['{options.outputPath}'],
+        });
+      });
+
+      it('should generate the publish target', async () => {
+        await libraryGenerator(tree, {
+          ...defaultOptions,
+          name: 'myLib',
+          publishable: true,
+          importPath: '@proj/my-lib',
+          compiler: 'tsc',
+        });
+
+        const config = readProjectConfiguration(tree, 'my-lib');
+        expect(config.targets.publish).toEqual({
+          executor: '@nrwl/workspace:run-commands',
+          options: {
+            command:
+              'node tools/scripts/publish.mjs my-lib {args.ver} {args.tag}',
+            cwd: 'dist/libs/my-lib',
+          },
+          dependsOn: [{ projects: 'self', target: 'build' }],
+        });
+      });
+
+      it('should generate publish script', async () => {
+        await libraryGenerator(tree, {
+          ...defaultOptions,
+          name: 'myLib',
+          publishable: true,
+          importPath: '@proj/my-lib',
+          compiler: 'tsc',
+        });
+
+        expect(tree.exists('tools/scripts/publish.mjs')).toBeTruthy();
+      });
+    });
   });
 });

packages/js/src/generators/library/library.ts

@@ -21,6 +21,7 @@ import {
   getRootTsConfigPathInTree,
 } from '@nrwl/workspace/src/utilities/typescript';
 import { join } from 'path';
+import { addMinimalPublishScript } from '../../utils/minimal-publish-script';
 import { LibraryGeneratorSchema } from '../../utils/schema';
 import { addSwcConfig } from '../../utils/swc/add-swc-config';
 import { addSwcDependencies } from '../../utils/swc/add-swc-dependencies';
@@ -91,12 +92,13 @@ function addProject(
     tags: options.parsedTags,
   };
 
-  if (options.buildable && options.config != 'npm-scripts') {
+  if (options.buildable && options.config !== 'npm-scripts') {
+    const outputPath = `dist/${destinationDir}/${options.projectDirectory}`;
     projectConfiguration.targets.build = {
       executor: `@nrwl/js:${options.compiler}`,
       outputs: ['{options.outputPath}'],
       options: {
-        outputPath: `dist/${destinationDir}/${options.projectDirectory}`,
+        outputPath,
         main: `${options.projectRoot}/src/index` + (options.js ? '.js' : '.ts'),
         tsConfig: `${options.projectRoot}/tsconfig.lib.json`,
         assets: [`${options.projectRoot}/*.md`],
@@ -106,6 +108,19 @@ function addProject(
     if (options.compiler === 'swc' && options.skipTypeCheck) {
       projectConfiguration.targets.build.options.skipTypeCheck = true;
     }
+
+    if (options.publishable) {
+      const publishScriptPath = addMinimalPublishScript(tree);
+
+      projectConfiguration.targets.publish = {
+        executor: '@nrwl/workspace:run-commands',
+        options: {
+          command: `node ${publishScriptPath} ${options.name} {args.ver} {args.tag}`,
+          cwd: outputPath,
+        },
+        dependsOn: [{ projects: 'self', target: 'build' }],
+      };
+    }
   }
 
   if (options.config === 'workspace') {

packages/js/src/utils/minimal-publish-script.ts

@@ -0,0 +1,44 @@
+import type { Tree } from '@nrwl/devkit';
+
+const publishScriptContent = `
+/**
+* This is a minimal script to publish your package to "npm".
+* This is meant to be used as-is or customize as you see fit.
+* 
+* This script is executed on "dist/path/to/library" as "cwd" by default.
+*
+* You might need to authenticate with NPM before running this script.
+*/
+
+import { execSync } from 'child_process';
+import { readFileSync, writeFileSync } from 'fs';
+import * as chalk from 'chalk';
+
+// Executing publish script: node path/to/publish.mjs {name} --version {version} --tag {tag}
+// Default "tag" to "next" so we won't publish the "latest" tag by accident.  
+const [, , name, version, tag = 'next'] = process.argv;
+
+// A simple SemVer validation to validate the version 
+const validVersion = /^\\d+\\.\\d+\\.\\d(-\\w+\\.\\d+)?/;
+if (!version || !validVersion.test(version)) {
+console.error(chalk.red(\`Invalid version\`));
+process.exit(1);
+}
+
+// Updating the version in "package.json" before publishing
+const json = JSON.parse(readFileSync(\`package.json\`).toString());
+json.version = version;
+writeFileSync(\`package.json\`, JSON.stringify(json, null, 2));
+
+// Execute "npm publish" to publish
+execSync(\`npm publish --access public\`);
+`;
+
+export function addMinimalPublishScript(tree: Tree) {
+  const publishScriptPath = 'tools/scripts/publish.mjs';
+  if (!tree.exists(publishScriptPath)) {
+    tree.write(publishScriptPath, publishScriptContent);
+  }
+
+  return publishScriptPath;
+}