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jdenticon-js/build/gulp/remove-mapped-source.js

@@ -0,0 +1,54 @@
+const { Transform } = require("stream");
+const { SourceMapConsumer, SourceMapGenerator } = require("source-map");
+
+function removeMappedSourceStream(...sourceNames) {
+    const sourceNamesToRemove = new Set(sourceNames);
+
+    return new Transform({
+        objectMode: true,
+        
+        transform(inputFile, _, fileDone) {
+            if (inputFile.sourceMap) {
+                let consumer = inputFile.sourceMap;
+                if (!(consumer instanceof SourceMapConsumer)) {
+                    consumer = new SourceMapConsumer(consumer);
+                }
+
+                const generator = new SourceMapGenerator({
+                    file: consumer.file,
+                    sourceRoot: consumer.sourceRoot,
+                });
+
+                consumer.sources.forEach(sourceFile => {
+                    const content = consumer.sourceContentFor(sourceFile);
+                    if (content != null && !sourceNamesToRemove.has(sourceFile)) {
+                        generator.setSourceContent(sourceFile, content);
+                    }
+                });
+
+                consumer.eachMapping(mapping => {
+                    if (!sourceNamesToRemove.has(mapping.source)) {
+                        generator.addMapping({
+                            original: {
+                                line: mapping.originalLine,
+                                column: mapping.originalColumn,
+                            },
+                            generated: {
+                                line: mapping.generatedLine,
+                                column: mapping.generatedColumn,
+                            },
+                            source: mapping.source,
+                            name: mapping.name,
+                        });
+                    }
+                });
+
+                inputFile.sourceMap = generator.toJSON();
+            }
+
+            fileDone(null, inputFile);
+        }
+    });
+}
+
+module.exports = removeMappedSourceStream;