Bump source-map and skip any files missing contents

`source-map` was incorrectly attempting to detect if we're in a browsers
context by checking if `typeof fetch === 'function'` which in never versions of
node if present. Because of this source-map was reqesting that we provide a
WASM file.

[read more here](mozilla/source-map#349)

Bumping to 0.8.0-beta.0 fixes this.

Also filters out any files in the sourcemap which don't have a file contents
associated with it.

index.js

@@ -73,6 +73,17 @@ assert(removeQuerySuffix("./index.css?8415") === "./index.css");
   }
 
   const toWrite = sourceFiles.filter(([savePath]) => !duplicates.has(savePath));
+  const missingContent = toWrite.filter(([, , content]) => !content)
+  const withContent = toWrite.filter(([, , content]) => !!content)
+
+  if (missingContent.length > 0) {
+    console.log(`Skipping ${missingContent.length} files which the source map did not provide any contents\n`)
+  }
+
+  if (withContent.length === 0) {
+    console.error('We were unable to find any files which contained source code in this source map')
+    process.exit(-1)
+  }
 
   const outputDirectory = resolve(
     process.cwd(),
@@ -83,7 +94,7 @@ assert(removeQuerySuffix("./index.css?8415") === "./index.css");
   }
 
   // write to the output directory
-  toWrite.forEach(([savePath, _, content]) => {
+  withContent.forEach(([savePath, _, content]) => {
     const outputPath = resolve(outputDirectory, savePath);
     const directory = dirname(outputPath);
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "source-map-to-source",
-  "version": "0.0.1",
+  "version": "1.0.2",
   "description": "",
   "main": "index.js",
   "type": "module",
@@ -11,10 +11,10 @@
   "author": "",
   "license": "MIT",
   "dependencies": {
-    "source-map": "^0.7.3",
+    "source-map": "^0.8.0-beta.0",
     "yargs": "^17.3.1"
   },
   "bin": {
-    "source-map-to-source": "./index.js"
+    "source-map-to-source": "index.js"
   }
 }