Add support for the sourcemaps ignorelist

Add support for the x_google_ignoreList to the SourceMapConsumer.

Author: bomsy

.DS_Store

@@ -187,6 +187,7 @@ class BasicSourceMapConsumer extends SourceMapConsumer {
       const sourcesContent = util.getArg(sourceMap, "sourcesContent", null);
       const mappings = util.getArg(sourceMap, "mappings");
       const file = util.getArg(sourceMap, "file", null);
+      const x_google_ignoreList = util.getArg(sourceMap, "x_google_ignoreList", null);
 
       // Once again, Sass deviates from the spec and supplies the version as a
       // string rather than a number, so we use loose equality checking here.
@@ -215,6 +216,7 @@ class BasicSourceMapConsumer extends SourceMapConsumer {
       that._mappings = mappings;
       that._sourceMapURL = aSourceMapURL;
       that.file = file;
+      that.x_google_ignoreList = x_google_ignoreList;
 
       that._computedColumnSpans = false;
       that._mappingsPtr = 0;
@@ -799,6 +801,22 @@ class IndexedSourceMapConsumer extends SourceMapConsumer {
     return sources;
   }
 
+  /*
+  *
+  */
+  get x_google_ignoreList() {
+    const x_google_ignoreList = [];
+    for (let i = 0; i < this._sections.length; i++) {
+      const ignoreList = this._sections[i].consumer.x_google_ignoreList;
+      if (ignoreList) {
+        for (let j = 0; j < ignoreList.length; j++) {
+          x_google_ignoreList.push(ignoreList[j]);
+        }
+      }
+    }
+    return x_google_ignoreList;
+  }
+
   /**
    * Returns the original source, line, and column information for the generated
    * source's line and column positions provided. The only argument is an object

lib/source-map-consumer.js

@@ -88,6 +88,16 @@ exports["test that the `sources` field has the original sources"] =
     map.destroy();
   };
 
+exports["test that the SourceMapConsumer supports the ignoreList"] = async function (assert) {
+    const map = await new SourceMapConsumer(util.testMapWithIgnoreList);
+    const sources = map.sources;
+    const ignoreList = map.x_google_ignoreList;
+    assert.equal(ignoreList[0], 0);
+    assert.equal(sources[ignoreList[0]], "/the/root/one.js");
+    assert.equal(ignoreList.length, 1);
+    map.destroy();
+}
+
 exports["test that the source root is reflected in a mapping's source field"] =
   async function (assert) {
     let map;

test/test-source-map-consumer.js

@@ -37,6 +37,18 @@ exports.testMap = {
   mappings:
     "CAAC,IAAI,IAAM,SAAUA,GAClB,OAAOC,IAAID;CCDb,IAAI,IAAM,SAAUE,GAClB,OAAOA",
 };
+
+exports.testMapWithIgnoreList = {
+  version: 3,
+  file: "min.js",
+  names: ["bar", "baz", "n"],
+  sources: ["one.js", "two.js"],
+  sourceRoot: "/the/root",
+  mappings:
+    "CAAC,IAAI,IAAM,SAAUA,GAClB,OAAOC,IAAID;CCDb,IAAI,IAAM,SAAUE,GAClB,OAAOA",
+  x_google_ignoreList: [0],
+};
+
 exports.testMapNoSourceRoot = {
   version: 3,
   file: "min.js",