feat: added the keep-source-maps value to the `deleteOriginalAssets…

…` option (#216)

README.md

@@ -50,7 +50,7 @@ And run `webpack` via your preferred method.
 | **[`threshold`](#threshold)** | `{Number}` | `0` | Only assets bigger than this size are processed (in bytes) |
 | **[`minRatio`](#minratio)** | `{Number}` | `0.8` | Only assets that compress better than this ratio are processed (`minRatio = Compressed Size / Original Size`) |
 | **[`filename`](#filename)** | `{String\|Function}` | `[path][base].gz` | The target asset filename |
-| **[`deleteOriginalAssets`](#deleteoriginalassets)** |  `{Boolean}`  | `false` | Whether to delete the original assets or not |
+| **[`deleteOriginalAssets`](#deleteoriginalassets)** | `{Boolean\|'keep-source-map'}` | `false` | Whether to delete the original assets or not |
 | **[`cache`](#cache)** | `{Boolean}` | `true` | Enable file caching |
 
 ### `test`
@@ -289,7 +289,7 @@ module.exports = {
 
 ### `deleteOriginalAssets`
 
-Type: `Boolean`
+Type: `Boolean | 'keep-source-map'`
 Default: `false`
 
 Whether to delete the original assets or not.
@@ -306,6 +306,19 @@ module.exports = {
 };
 ```
 
+To exclude sourcemaps from compression
+
+```js
+module.exports = {
+ plugins: [
+ new CompressionPlugin({
+ exclude: /.map$/
+ deleteOriginalAssets: 'keep-source-map',
+ }),
+ ],
+};
+```
+
 ### `cache`
 
 > ⚠ Ignored in webpack 5! Please use https://webpack.js.org/configuration/other-options/#cache.

package.json

@@ -71,7 +71,7 @@
  "npm-run-all": "^4.1.5",
  "prettier": "^2.1.2",
  "standard-version": "^9.0.0",
- "webpack": "^5.3.2"
+ "webpack": "^5.4.0"
  },
  "keywords": [
  "webpack"

src/index.js

@@ -299,7 +299,21 @@ class CompressionPlugin {
  }
 
  if (this.options.deleteOriginalAssets) {
- // eslint-disable-next-line no-param-reassign
+ if (this.options.deleteOriginalAssets === 'keep-source-map') {
+ // TODO `...` required only for webpack@4
+ const updatedAssetInfo = {
+ ...info,
+ related: { ...info.related, sourceMap: null },
+ };
+
+ CompressionPlugin.updateAsset(
+ compilation,
+ name,
+ inputSource,
+ updatedAssetInfo
+ );
+ }
+
  CompressionPlugin.deleteAsset(compilation, name);
  } else {
  // TODO `...` required only for webpack@4

src/options.json

@@ -85,7 +85,15 @@
  },
  "deleteOriginalAssets": {
  "description": "Whether to delete the original assets or not.",
- "type": "boolean"
+ "anyOf": [
+ {
+ "type": "boolean"
+ },
+ {
+ "type": "string",
+ "enum": ["keep-source-map"]
+ }
+ ]
  },
  "filename": {
  "description": "The target asset filename.",