feat: add utility to strip source maps (#391)

src/main.ts

@@ -25,6 +25,7 @@ export {
   stringify,
   stringifyStep,
   parseSourceMap,
+  stripSourceMap,
   StringifyOptions,
   SourceMap,
 } from './stringify.js';

src/stringify.ts

@@ -99,16 +99,25 @@ export async function stringifyStep(
   return out.toString();
 }
 
+function isSourceMapLine(line: string): boolean {
+  return line.trim().startsWith(SOURCE_MAP_PREFIX);
+}
+
 /**
  * Extracts a source map from a text.
  */
 export function parseSourceMap(text: string): SourceMap | undefined {
   const lines = text.split('\n');
   for (let i = lines.length - 1; i >= 0; i--) {
     const line = lines[i] as string;
-    if (line.trim().startsWith(SOURCE_MAP_PREFIX)) {
+    if (isSourceMapLine(line)) {
       return decode(line.trim().substring(SOURCE_MAP_PREFIX.length));
     }
   }
   return;
 }
+
+export function stripSourceMap(text: string): string {
+  const lines = text.split('\n');
+  return lines.filter((line) => !isSourceMapLine(line)).join('\n');
+}

test/stringify.test.ts

@@ -14,7 +14,7 @@
     limitations under the License.
  */
 
-import { parseSourceMap, stringify } from '../src/stringify.js';
+import { parseSourceMap, stringify, stripSourceMap } from '../src/stringify.js';
 import { assert } from 'chai';
 import { StringifyExtension } from '../src/StringifyExtension.js';
 import { Step, StepType, UserFlow } from '../src/Schema.js';
@@ -285,4 +285,21 @@ describe('stringify', () => {
     `);
     assert.deepStrictEqual(sourceMap, [1, 1, 3]);
   });
+
+  it('should strip a source map', async () => {
+    const sourceMap = stripSourceMap(`
+      test
+      test
+      test
+      //# recorderSourceMap=BBD
+    `);
+    assert.deepStrictEqual(
+      sourceMap,
+      `
+      test
+      test
+      test
+    `
+    );
+  });
 });