diff --git a/src/compiler/preprocess/decode_sourcemap.js b/src/compiler/preprocess/decode_sourcemap.js
index 13517be098..cb0987f013 100644
--- a/src/compiler/preprocess/decode_sourcemap.js
+++ b/src/compiler/preprocess/decode_sourcemap.js
@@ -7,82 +7,76 @@ import { decode as decode_mappings } from '@jridgewell/sourcemap-codec';
  * @param {any} generator
  */
 function decoded_sourcemap_from_generator(generator) {
-    let previous_generated_line = 1;
-    const converted_mappings = [[]];
-    let result_line;
-    let result_segment;
-    let mapping;
-    const source_idx = generator._sources
-        .toArray()
-        .reduce((acc, val, idx) => ((acc[val] = idx), acc), {});
-    const name_idx = generator._names
-        .toArray()
-        .reduce((acc, val, idx) => ((acc[val] = idx), acc), {});
-    const mappings = generator._mappings.toArray();
-    result_line = converted_mappings[0];
-    for (let i = 0, len = mappings.length; i < len; i++) {
-        mapping = mappings[i];
-        if (mapping.generatedLine > previous_generated_line) {
-            while (mapping.generatedLine > previous_generated_line) {
-                converted_mappings.push([]);
-                previous_generated_line++;
-            }
-            result_line = converted_mappings[mapping.generatedLine - 1]; // line is one-based
-        }
-        else if (i > 0) {
-            const previous_mapping = mappings[i - 1];
-            if (
-            // sorted by selectivity
-            mapping.generatedColumn === previous_mapping.generatedColumn &&
-                mapping.originalColumn === previous_mapping.originalColumn &&
-                mapping.name === previous_mapping.name &&
-                mapping.generatedLine === previous_mapping.generatedLine &&
-                mapping.originalLine === previous_mapping.originalLine &&
-                mapping.source === previous_mapping.source) {
-                continue;
-            }
-        }
-        result_line.push([mapping.generatedColumn]);
-        result_segment = result_line[result_line.length - 1];
-        if (mapping.source != null) {
-            result_segment.push(...[
-                source_idx[mapping.source],
-                mapping.originalLine - 1,
-                mapping.originalColumn
-            ]);
-            if (mapping.name != null) {
-                result_segment.push(name_idx[mapping.name]);
-            }
-        }
-    }
-    const map = {
-        version: generator._version,
-        sources: generator._sources.toArray(),
-        names: generator._names.toArray(),
-        mappings: converted_mappings
-    };
-    if (generator._file != null) {
-        map.file = generator._file;
-    }
-    // not needed: map.sourcesContent and map.sourceRoot
-    return map;
+	let previous_generated_line = 1;
+	const converted_mappings = [[]];
+	let result_line;
+	let result_segment;
+	let mapping;
+	const source_idx = generator._sources
+		.toArray()
+		.reduce((acc, val, idx) => ((acc[val] = idx), acc), {});
+	const name_idx = generator._names
+		.toArray()
+		.reduce((acc, val, idx) => ((acc[val] = idx), acc), {});
+	const mappings = generator._mappings.toArray();
+	result_line = converted_mappings[0];
+	for (let i = 0, len = mappings.length; i < len; i++) {
+		mapping = mappings[i];
+		if (mapping.generatedLine > previous_generated_line) {
+			while (mapping.generatedLine > previous_generated_line) {
+				converted_mappings.push([]);
+				previous_generated_line++;
+			}
+			result_line = converted_mappings[mapping.generatedLine - 1]; // line is one-based
+		} else if (i > 0) {
+			const previous_mapping = mappings[i - 1];
+			if (
+				// sorted by selectivity
+				mapping.generatedColumn === previous_mapping.generatedColumn &&
+				mapping.originalColumn === previous_mapping.originalColumn &&
+				mapping.name === previous_mapping.name &&
+				mapping.generatedLine === previous_mapping.generatedLine &&
+				mapping.originalLine === previous_mapping.originalLine &&
+				mapping.source === previous_mapping.source
+			) {
+				continue;
+			}
+		}
+		result_line.push([mapping.generatedColumn]);
+		result_segment = result_line[result_line.length - 1];
+		if (mapping.source != null) {
+			result_segment.push(
+				...[source_idx[mapping.source], mapping.originalLine - 1, mapping.originalColumn]
+			);
+			if (mapping.name != null) {
+				result_segment.push(name_idx[mapping.name]);
+			}
+		}
+	}
+	const map = {
+		version: generator._version,
+		sources: generator._sources.toArray(),
+		names: generator._names.toArray(),
+		mappings: converted_mappings
+	};
+	if (generator._file != null) {
+		map.file = generator._file;
+	}
+	// not needed: map.sourcesContent and map.sourceRoot
+	return map;
 }
 
 /**
  * @param {Processed} processed
  */
 export function decode_map(processed) {
-    let decoded_map = typeof processed.map === 'string' ? JSON.parse(processed.map) : processed.map;
-    if (typeof decoded_map.mappings === 'string') {
-        decoded_map.mappings = decode_mappings(decoded_map.mappings);
-    }
-    if (decoded_map._mappings && decoded_map.constructor.name === 'SourceMapGenerator') {
-        // import decoded sourcemap from mozilla/source-map/SourceMapGenerator
-        decoded_map = decoded_sourcemap_from_generator(decoded_map);
-    }
-    return decoded_map;
+	let decoded_map = typeof processed.map === 'string' ? JSON.parse(processed.map) : processed.map;
+	if (typeof decoded_map.mappings === 'string') {
+		decoded_map.mappings = decode_mappings(decoded_map.mappings);
+	}
+	if (decoded_map._mappings && decoded_map.constructor.name === 'SourceMapGenerator') {
+		// import decoded sourcemap from mozilla/source-map/SourceMapGenerator
+		decoded_map = decoded_sourcemap_from_generator(decoded_map);
+	}
+	return decoded_map;
 }
-
-
-
-