Reimplement input sourcemap merging.

packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-complex/source-map.json

@@ -4,7 +4,7 @@
     "HelloWorld.vue"
   ],
   "names": [],
-  "mappings": ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AAsFA;;QAEA;;SACA;;WAEA,AACA;AAFA;AAGA;;AANA",
+  "mappings": ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;eAsFA;AACA,QAAA,YADA;;AAEA,SAAA;AACA,WAAA;AACA,WAAA;AADA,KAAA;AAGA;;AANA,C",
   "sourceRoot": "src/components",
   "sourcesContent": [
     "<template>\n  <div class=\"hello\">\n    <h1>{{ msg }}</h1>\n    <h2>Essential Links</h2>\n    <ul>\n      <li>\n        <a\n          href=\"https://vuejs.org\"\n          target=\"_blank\"\n        >\n          Core Docs\n        </a>\n      </li>\n      <li>\n        <a\n          href=\"https://forum.vuejs.org\"\n          target=\"_blank\"\n        >\n          Forum\n        </a>\n      </li>\n      <li>\n        <a\n          href=\"https://chat.vuejs.org\"\n          target=\"_blank\"\n        >\n          Community Chat\n        </a>\n      </li>\n      <li>\n        <a\n          href=\"https://twitter.com/vuejs\"\n          target=\"_blank\"\n        >\n          Twitter\n        </a>\n      </li>\n      <br>\n      <li>\n        <a\n          href=\"http://vuejs-templates.github.io/webpack/\"\n          target=\"_blank\"\n        >\n          Docs for This Template\n        </a>\n      </li>\n    </ul>\n    <h2>Ecosystem</h2>\n    <ul>\n      <li>\n        <a\n          href=\"http://router.vuejs.org/\"\n          target=\"_blank\"\n        >\n          vue-router\n        </a>\n      </li>\n      <li>\n        <a\n          href=\"http://vuex.vuejs.org/\"\n          target=\"_blank\"\n        >\n          vuex\n        </a>\n      </li>\n      <li>\n        <a\n          href=\"http://vue-loader.vuejs.org/\"\n          target=\"_blank\"\n        >\n          vue-loader\n        </a>\n      </li>\n      <li>\n        <a\n          href=\"https://github.com/vuejs/awesome-vue\"\n          target=\"_blank\"\n        >\n          awesome-vue\n        </a>\n      </li>\n    </ul>\n  </div>\n</template>\n\n<script>\nexport default {\n  name: 'HelloWorld',\n  data () {\n    return {\n      msg: 'Welcome to Your Vue.js App'\n    }\n  }\n}\n</script>\n\n<!-- Add \"scoped\" attribute to limit CSS to this component only -->\n<style scoped>\nh1, h2 {\n  font-weight: normal;\n}\nul {\n  list-style-type: none;\n  padding: 0;\n}\nli {\n  display: inline-block;\n  margin: 0 10px;\n}\na {\n  color: #42b983;\n}\n</style>\n"

packages/babel-core/test/fixtures/transformation/source-maps/input-source-map-complex/source-mappings.json

@@ -1,37 +1,27 @@
 [
   {
     "generated": {
-      "line": 91,
-      "column": 0
+      "line": 92,
+      "column": 15
     },
     "original": {
       "line": 87,
       "column": 0
     }
   },
-  {
-    "generated": {
-      "line": 92,
-      "column": 0
-    },
-    "original": {
-      "line": null,
-      "column": null
-    }
-  },
   {
     "generated": {
       "line": 93,
       "column": 0
     },
     "original": {
-      "line": null,
-      "column": null
+      "line": 88,
+      "column": 0
     }
   },
   {
     "generated": {
-      "line": 93,
+      "line": 95,
       "column": 9
     },
     "original": {
@@ -41,18 +31,8 @@
   },
   {
     "generated": {
-      "line": 94,
-      "column": 9
-    },
-    "original": {
-      "line": null,
-      "column": null
-    }
-  },
-  {
-    "generated": {
-      "line": 95,
-      "column": 9
+      "line": 96,
+      "column": 0
     },
     "original": {
       "line": 90,
@@ -61,21 +41,31 @@
   },
   {
     "generated": {
-      "line": 96,
+      "line": 97,
       "column": 0
     },
     "original": {
-      "line": null,
-      "column": null
+      "line": 91,
+      "column": 0
     }
   },
   {
     "generated": {
-      "line": 97,
-      "column": 12
+      "line": 98,
+      "column": 0
     },
     "original": {
-      "line": 92,
+      "line": 90,
+      "column": 0
+    }
+  },
+  {
+    "generated": {
+      "line": 99,
+      "column": 0
+    },
+    "original": {
+      "line": 93,
       "column": 0
     }
   }

packages/babel-core/test/fixtures/transformation/source-maps/input-source-map/source-map.json

@@ -1,11 +1,7 @@
 {
-  "version": 3,
-  "mappings": "AAAA,UAAU,Y;SAAM,A;AAAC",
+  "mappings": "AAAA,IAAA,MAAU,Y;SAAM,C;AAAC,CAAjB",
   "names": [],
-  "sources": [
-    "original.js"
-  ],
-  "sourcesContent": [
-    "var foo = () => 4;"
-  ]
+  "sources": ["original.js"],
+  "sourcesContent": ["var foo = () => 4;"],
+  "version": 3
 }