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bomb.sh/docs/clack/basics/getting-started/
cli
command-line
command-line-app
node
prompt
prompts
fix: strip destructive ANSI codes from task logs (#420)
authored by
James Garbutt
and committed by
GitHub
(Nov 22, 2025, 8:58 AM UTC)
69681ea4
0041d810
+59
-1
+5
.changeset/evil-rats-turn.md
+5
.changeset/evil-rats-turn.md
+5
-1
packages/prompts/src/task-log.ts
+5
-1
packages/prompts/src/task-log.ts
···
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};
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}
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const stripDestructiveANSI = (input: string): string => {
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return input.replace(/\x1b\[(?:\d+;)*\d*[ABCDEFGHfJKSTsu]|\x1b\[(s|u)/g, '');
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};
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/**
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* Renders a log which clears on success and remains on failure
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*/
···
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if ((mopts?.raw !== true || !lastMessageWasRaw) && buffer.value !== '') {
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buffer.value += '\n';
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}
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buffer.value += msg;
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buffer.value += stripDestructiveANSI(msg);
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lastMessageWasRaw = mopts?.raw === true;
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if (opts.limit !== undefined) {
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const lines = buffer.value.split('\n');
+35
packages/prompts/test/__snapshots__/task-log.test.ts.snap
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packages/prompts/test/__snapshots__/task-log.test.ts.snap
···
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]
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`;
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exports[`taskLog (isCI = false) > message > destructive ansi codes are stripped 1`] = `
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[
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"[90m│[39m
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",
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"[32m◇[39m foo
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",
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"[90m│[39m
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",
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"[90m│[39m [2mline 1[22m
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",
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"<erase.line><cursor.up count=1><erase.line><cursor.left count=1>",
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"[90m│[39m [2mline 1[22m
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[90m│[39m [2mline 2 bad ansi![22m
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",
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"<erase.line><cursor.up count=1><erase.line><cursor.up count=1><erase.line><cursor.left count=1>",
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"[90m│[39m [2mline 1[22m
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[90m│[39m [2mline 2 bad ansi![22m
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[90m│[39m [2mline 3[22m
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",
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]
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`;
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+
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exports[`taskLog (isCI = false) > message > enforces limit if set 1`] = `
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[
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"[90m│[39m
···
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",
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"[90m│[39m
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",
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]
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`;
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exports[`taskLog (isCI = true) > message > destructive ansi codes are stripped 1`] = `
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[
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"[90m│[39m
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",
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"[32m◇[39m foo
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",
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"[90m│[39m
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",
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"<erase.line><cursor.up count=1><erase.line><cursor.left count=1>",
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"<erase.line><cursor.up count=1><erase.line><cursor.up count=1><erase.line><cursor.left count=1>",
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]
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`;
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+14
packages/prompts/test/task-log.test.ts
+14
packages/prompts/test/task-log.test.ts
···
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expect(output.buffer).toMatchSnapshot();
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});
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+
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test('destructive ansi codes are stripped', async () => {
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const log = prompts.taskLog({
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input,
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output,
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title: 'foo',
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});
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log.message('line 1');
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log.message('line 2\x1b[2K bad ansi!');
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log.message('line 3');
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expect(output.buffer).toMatchSnapshot();
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});
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});
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describe('error', () => {