Update sourcemapPathTransform to also take the path to the sourcemap …

docs/999-big-list-of-options.md

@@ -670,7 +670,7 @@ The location of the generated bundle. If this is an absolute path, all the `sour
 `sourcemapFile` is not required if `output` is specified, in which case an output filename will be inferred by adding ".map"  to the output filename for the bundle.
 
 #### output.sourcemapPathTransform
-Type: `(sourcePath: string) => string`
+Type: `(sourcePath: string, sourcemapPath: string) => string`
 
 A transformation to apply to each path in a sourcemap. For instance the following will change all paths to be relative to the `src` directory.
 

src/Chunk.ts

@@ -721,7 +721,7 @@ export default class Chunk {
 					const { sourcemapPathTransform } = options;
 
 					if (sourcemapPathTransform) {
-						const newSourcePath = sourcemapPathTransform(sourcePath);
+						const newSourcePath = sourcemapPathTransform(sourcePath, file + ".map");
 
 						if (typeof newSourcePath !== 'string') {
 							error(errFailedValidation(`sourcemapPathTransform function must return a string.`));

test/function/samples/transform-source-function-gets-two-args/_config.js

@@ -0,0 +1,18 @@
+const path = require('path');
+
+module.exports = {
+	description:
+		'pass the file path to sourcemapPathTransform',
+	options: {
+		output: {
+			name: 'myModule',
+			sourcemap: true,
+			file: path.resolve(__dirname, 'main.js'),
+			sourcemapPathTransform: (relativePath, sourcemapPath) => path.resolve(path.dirname(sourcemapPath), relativePath)
+		}
+	},
+	generateError: {
+		code: 'VALIDATION_ERROR',
+		message: 'sourcemapPathTransform function must return a string.'
+	}
+};

test/function/samples/transform-source-function-gets-two-args/main.js

@@ -0,0 +1 @@
+export default 42;