feat: support exportJSON with a specific path

Author: hawtim

README.md

@@ -145,7 +145,20 @@ Whether to run unused export detection or not.
 
 #### options.exportJSON (default: `false`)
 
-When set to `true`, it will export the unused files and unused export to a JSON file called `deadcode.json` at the root of the project.
+`false`: won't create `deadcode.json` for the unused files and unused export.
+
+`true`: create `deadcode.json` for the unused files and unused export at the root of the project.
+
+You can set `exportJSON` to a specific path, and it will generate `deadcode.json` in that path.
+
+```js
+new DeadCodePlugin({
+  patterns: ["*.(js|css)"],
+  exclude: ["**/node_modules/**"],
+  log: "none",
+  exportJSON: "./analysis"
+}),
+```
 
 [npm]: https://img.shields.io/npm/v/webpack-deadcode-plugin.svg
 [npm-url]: https://npmjs.com/package/webpack-deadcode-plugin

src/detect.js

@@ -2,6 +2,7 @@ const path = require("path");
 const chalk = require("chalk");
 const fs = require("fs");
 const fg = require("fast-glob");
+const getDirName = path.dirname;
 
 function detectDeadCode(compilation, options) {
 	const isWebpack5 = compilation.chunkGraph ? true : false;
@@ -14,22 +15,24 @@ function detectDeadCode(compilation, options) {
 
 	if (options.detectUnusedFiles) {
 		unusedFiles = includedFiles.filter(file => !compiledFiles[file]);
-
-		if (Object.keys(unusedFiles).length > 0 || options.log !== "none") {
+		if ((Object.keys(unusedFiles).length > 0 && options.log !== "none") || options.log === "all") {
 			logUnusedFiles(unusedFiles);
 		}
 	}
 
 	if (options.detectUnusedExport) {
 		unusedExportMap = getUsedExportMap(convertFilesToDict(includedFiles), compilation, isWebpack5);
 
-		if (Object.keys(unusedExportMap).length > 0 || options.log !== "none") {
+		if ((Object.keys(unusedExportMap).length > 0 && options.log !== "none") || options.log === "all") {
 			logUnusedExportMap(unusedExportMap);
 		}
 	}
 
 	if (options.exportJSON) {
 		let exportPath = "deadcode.json";
+		if (typeof options.exportJSON === "string") {
+			exportPath = options.exportJSON + "/" + exportPath;
+		}
 		try {
 			fs.stat(exportPath, err => {
 				if (err == null) {
@@ -57,11 +60,12 @@ function exportResultToJSON(exportPath, unusedFiles, unusedExports) {
 		unusedFiles,
 		unusedExports,
 	};
-	fs.writeFile(exportPath, JSON.stringify(data, null, 2), err => {
-		if (err) {
-			throw err;
-		}
-		console.log(exportPath + " is generated.");
+	fs.mkdir(getDirName(exportPath), { recursive: true }, err => {
+		if (err) throw err;
+		fs.writeFile(exportPath, JSON.stringify(data, null, 2), err => {
+			if (err) throw err;
+			console.info(path.resolve(exportPath) + " is generated.");
+		});
 	});
 }