Add colored namespaces to debug output

packages/wmr/package.json

@@ -125,7 +125,7 @@
 		"husky": "^4.2.5",
 		"jest": "^26.1.0",
 		"jest-puppeteer": "^4.4.0",
-		"kolorist": "^1.2.7",
+		"kolorist": "^1.3.0",
 		"lint-staged": "^10.2.11",
 		"magic-string": "^0.25.7",
 		"ncp": "^2.0.0",

packages/wmr/src/lib/normalize-options.js

@@ -3,6 +3,7 @@ import { promises as fs } from 'fs';
 import url from 'url';
 import { readEnvFiles } from './environment.js';
 import { compileSingleModule } from './compile-single-module.js';
+import { debug } from './output-utils.js';
 
 /**
  * @template {Options} T
@@ -101,6 +102,8 @@ export async function normalizeOptions(options, mode) {
 		if (custom[mode]) await custom[mode](options);
 	}
 
+	debug('wmr:config')(options);
+
 	// @ts-ignore-next
 	return options;
 }

packages/wmr/src/lib/output-utils.js

@@ -1,4 +1,6 @@
 import * as kl from 'kolorist';
+import * as util from 'util';
+import { relative } from 'path';
 
 /** @param {import('rollup').RollupOutput} bundle */
 export function bundleStats(bundle) {
@@ -85,3 +87,80 @@ export function codeFrame(code, loc) {
 	}
 	return frame;
 }
+
+// Taken from https://github.com/visionmedia/debug/blob/e47f96de3de5921584364b4ac91e2769d22a3b1f/src/node.js#L35
+// prettier-ignore
+const colors = [
+	20, 21, 26, 27, 32, 33, 38, 39, 40, 41, 42, 43, 44, 45, 56, 57, 62, 63, 68,
+	69, 74, 75, 76, 77, 78, 79, 80, 81, 92, 93, 98, 99, 112, 113, 128, 129, 134,
+	135, 148, 149, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171,
+	172, 173, 178, 179, 184, 185, 196, 197, 198, 199, 200, 201, 202, 203, 204,
+	205, 206, 207, 208, 209, 214, 215, 220, 221
+];
+
+// Taken from: https://github.com/visionmedia/debug/blob/e47f96de3de5921584364b4ac91e2769d22a3b1f/src/common.js#L41-L50
+function selectColor(namespace) {
+	let hash = 0;
+
+	for (let i = 0; i < namespace.length; i++) {
+		hash = (hash << 5) - hash + namespace.charCodeAt(i);
+		hash |= 0; // Convert to 32bit integer
+	}
+
+	return colors[Math.abs(hash) % colors.length];
+}
+
+/**
+ * Print namespaced log messages when the DEBUG environment
+ * variable is set.
+ * @param {string} namespace
+ * @param {number} [color]
+ * @returns {(...args: any[]) => void}
+ */
+export function debug(namespace, color = selectColor(namespace)) {
+	const ns = kl.ansi256(color)(`  ${namespace}  `);
+	return (...args) => {
+		if (process.env.DEBUG) {
+			const str = args.map(arg => {
+				const value = arg === null || typeof arg !== 'object' ? arg : util.inspect(arg, false, null, true);
+
+				return value
+					.split('\n')
+					.map(line => ns + line)
+					.join('\n');
+			});
+			console.log.apply(console, str);
+		}
+	};
+}
+
+/**
+ * Serialize path to display special characters such as
+ * the null byte of necessary.
+ * @param {string} path
+ * @returns {string}
+ */
+export function formatPath(path) {
+	path = path || 'null';
+	if (typeof path === 'object') {
+		path = path.id;
+	}
+	if (path.startsWith('\b') || path.startsWith('\0')) {
+		path = JSON.stringify(path);
+	}
+	if (path.startsWith(process.cwd())) {
+		path = relative(process.cwd(), path);
+	}
+
+	return path;
+}
+
+/**
+ * @param {string} from
+ * @param {import('rollup').ResolvedId | string | null} to
+ */
+export function formatResolved(from, to) {
+	from = formatPath(from);
+	to = formatPath(to);
+	return `${kl.cyan(from)} -> ${kl.dim(to)}`;
+}

packages/wmr/src/lib/rollup-plugin-container.js

@@ -2,8 +2,9 @@ import { resolve, relative, dirname, sep, posix } from 'path';
 import { createHash } from 'crypto';
 import { promises as fs } from 'fs';
 import * as acorn from 'acorn';
-import acornClassFields from 'acorn-class-fields';
 import * as kl from 'kolorist';
+import acornClassFields from 'acorn-class-fields';
+import { debug, formatResolved, formatPath } from './output-utils.js';
 
 // Rollup respects "module", Node 14 doesn't.
 const cjsDefault = m => ('default' in m ? m.default : m);
@@ -156,6 +157,10 @@ export function createPluginContainer(plugins, opts = {}) {
 		}
 	};
 
+	const logResolve = debug('wmr:resolve');
+	const logTransform = debug('wmr:transform');
+	const logLoad = debug('wmr:load');
+
 	const container = {
 		ctx,
 
@@ -221,6 +226,7 @@ export function createPluginContainer(plugins, opts = {}) {
 		 * @returns {Promise<import('rollup').ResolveIdResult>}
 		 */
 		async resolveId(id, importer, _skip) {
+			let originalId = id;
 			const key = identifierPair(id, importer);
 
 			const opts = {};
@@ -250,9 +256,7 @@ export function createPluginContainer(plugins, opts = {}) {
 					Object.assign(opts, result);
 				}
 
-				if (process.env.DEBUG) {
-					console.log(`  ${kl.dim('plugin:') + kl.bold(kl.yellow(p.name))}  ${JSON.stringify(id)}`);
-				}
+				logResolve(`${formatResolved(originalId, id)} [${p.name}]`);
 				// resolveId() is hookFirst - first non-null result is returned.
 				break;
 			}
@@ -270,6 +274,8 @@ export function createPluginContainer(plugins, opts = {}) {
 				if (!plugin.transform) continue;
 				const result = await plugin.transform.call(ctx, code, id);
 				if (!result) continue;
+
+				logTransform(`${kl.dim(formatPath(id))} [${plugin.name}]`);
 				if (typeof result === 'object') {
 					code = result.code;
 				} else {
@@ -288,6 +294,7 @@ export function createPluginContainer(plugins, opts = {}) {
 				if (!plugin.load) continue;
 				const result = await plugin.load.call(ctx, id);
 				if (result) {
+					logLoad(`${formatPath(id)} [${plugin.name}]`);
 					return result;
 				}
 			}

packages/wmr/src/plugins/aliases-plugin.js

@@ -1,5 +1,6 @@
 import { dirname, resolve } from 'path';
 import { promises as fs } from 'fs';
+import { debug, formatResolved } from '../lib/output-utils.js';
 
 /**
  * Package.json "aliases" field: {"a":"b"}
@@ -9,6 +10,7 @@ import { promises as fs } from 'fs';
  * @returns {import('rollup').Plugin}
  */
 export default function aliasesPlugin({ aliases = {}, cwd } = {}) {
+	const log = debug('aliases');
 	let pkgFilename;
 	let aliasesLoaded;
 	async function fromPackageJson() {
@@ -67,7 +69,9 @@ export default function aliasesPlugin({ aliases = {}, cwd } = {}) {
 			if (aliased === id) return;
 			// now allow other resolvers to handle the aliased version
 			// (this is important since they may mark as external!)
-			return await this.resolve(aliased, importer, { skipSelf: true });
+			const resolved = await this.resolve(aliased, importer, { skipSelf: true });
+			log(formatResolved(id, resolved));
+			return resolved;
 		}
 	};
 }

packages/wmr/src/plugins/bundle-plugin.js

@@ -1,4 +1,6 @@
 import { relative } from 'path';
+import * as kl from 'kolorist';
+import { debug } from '../lib/output-utils.js';
 
 /**
  * @param {object} [options]
@@ -7,6 +9,7 @@ import { relative } from 'path';
  * @returns {import('rollup').Plugin}
  */
 export default function bundlePlugin({ cwd = '.', inline } = {}) {
+	const log = debug('bundle');
 	return {
 		name: 'bundle-plugin',
 		async resolveId(id, importer) {
@@ -15,6 +18,7 @@ export default function bundlePlugin({ cwd = '.', inline } = {}) {
 			if (resolved) {
 				if (inline) {
 					const url = '/' + relative(cwd, resolved.id).replace(/^\./, '');
+					log(`[inline] ${kl.dim(url)}`);
 					return {
 						id: `data:text/javascript,export default${encodeURIComponent(JSON.stringify(url))}`,
 						external: true

yarn.lock

@@ -5025,10 +5025,10 @@ kleur@^4.1.3:
   resolved "https://registry.yarnpkg.com/kleur/-/kleur-4.1.4.tgz#8c202987d7e577766d039a8cd461934c01cda04d"
   integrity sha512-8QADVssbrFjivHWQU7KkMgptGTl6WAcSdlbBPY4uNF+mWr6DGcKrvY2w4FQJoXch7+fKMjj0dRrL75vk3k23OA==
 
-kolorist@^1.2.7:
-  version "1.2.10"
-  resolved "https://registry.yarnpkg.com/kolorist/-/kolorist-1.2.10.tgz#0f97a3f3a1dd75e980765c7cec8a1de258e580c6"
-  integrity sha512-S3QtGjCHyINclP4LSClgHw4gi/NxTFcSorqD9SWfrREHKtMyGfi6pyDCTbpQaqyZrMAjB4Exde8eco6kejkqQg==
+kolorist@^1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/kolorist/-/kolorist-1.3.0.tgz#81345b3a15aaa5fa5f10159be72fd429dddd7321"
+  integrity sha512-8t4WbQ0FxMSJdWMDuvNhSRbxQiMAIN97CthZHtDpS9Zo8baG0nSvqTCCgcp4SKQdLD05LzWVYxWQyE2n820BfA==
 
 latest-version@^5.0.0:
   version "5.1.0"