use isPlainObject function

johnagan · May 21, 2019 · 57d2cd4 · 57d2cd4
1 parent 901affd
commit 57d2cd4
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Showing 2 changed files with 12 additions and 2 deletions.
diff --git a/README.md b/README.md
@@ -109,7 +109,7 @@ new CleanWebpackPlugin({
     //
     // Use !negative patterns to exclude files
     //
-    // default: disabled
+    // default: []
     cleanAfterEveryBuildPatterns: ['static*.*', '!static1.js'],
 
     // Allow clean patterns outside of process.cwd()

diff --git a/src/clean-webpack-plugin.ts b/src/clean-webpack-plugin.ts
@@ -62,6 +62,16 @@ export interface Options {
     dangerouslyAllowCleanPatternsOutsideProject?: boolean;
 }
 
+// Copied from https://github.com/sindresorhus/is-plain-obj/blob/97480673cf12145b32ec2ee924980d66572e8a86/index.js
+function isPlainObject(value: unknown): boolean {
+    if (Object.prototype.toString.call(value) !== '[object Object]') {
+        return false;
+    }
+
+    const prototype = Object.getPrototypeOf(value);
+    return prototype === null || prototype === Object.getPrototypeOf({});
+}
+
 class CleanWebpackPlugin {
     private readonly dry: boolean;
     private readonly verbose: boolean;
@@ -75,7 +85,7 @@ class CleanWebpackPlugin {
     private outputPath: string;
 
     constructor(options: Options = {}) {
-        if (Object.prototype.toString.call(options) !== "[object Object]") {
+        if (isPlainObject(options) === false) {
             throw new Error(`clean-webpack-plugin only accepts an options object. See:
             https://github.com/johnagan/clean-webpack-plugin#options-and-defaults-optional`);
         }