Strip ANSI color codes from command output

src/run.test.ts

@@ -62,6 +62,19 @@ describe("runFile", () => {
     }
   })
 
+  test("strips ANSI color codes from output", async () => {
+    const file = makeFile([
+      { command: `printf '\\033[31mred\\033[0m and \\033[1;32mbold green\\033[0m'` },
+    ])
+    const result = await runFile(file, defaultOpts)
+    try {
+      expect(result.results[0]?.actual).toEqual(["red and bold green"])
+      expect(result.results[0]?.exitCode).toBe(0)
+    } finally {
+      await cleanupTmpDir(result.tmpDir)
+    }
+  })
+
   test("background process output does not leak into subsequent commands", async () => {
     const file = makeFile([
       // Start a background process that writes to stdout after a delay

src/run.ts

@@ -145,6 +145,13 @@ function parseSentinelOutput(
   return { outputs, exitCodes }
 }
 
+// eslint-disable-next-line no-control-regex
+const ANSI_REGEX = /[\u001b\u009b][\[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]/g
+
+function stripAnsi(line: string): string {
+  return line.replace(ANSI_REGEX, "")
+}
+
 function trimTrailingEmpty(lines: string[]): string[] {
   let end = lines.length
   while (end > 0 && lines[end - 1] === "") end--
@@ -253,7 +260,7 @@ export async function runFile(
 
     const results: CommandResult[] = file.commands.map((cmd, i) => ({
       command: cmd,
-      actual: outputs[i] ?? [],
+      actual: (outputs[i] ?? []).map(stripAnsi),
       exitCode: exitCodes[i] ?? 1,
     }))