vitest.dev / vitest
[READ-ONLY] Mirror of https://github.com/vitest-dev/vitest. Next generation testing framework powered by Vite. vitest.dev
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fix: fix mixed stdout/stderr log timestamps in `onUserConsoleLog` (#10308)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: hi-ogawa <4232207+hi-ogawa@users.noreply.github.com>
Co-authored-by: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Co-authored-by: Vladimir <sleuths.slews0s@icloud.com>

authored by

Copilot
copilot-swe-agent[bot]
hi-ogawa
Hiroshi Ogawa
Vladimir and committed by
GitHub (Jun 1, 2026, 1:33 PM +0200) 62756547 fe5ed6bc

+78 -16
+2 -2
packages/vitest/src/runtime/console.ts
··· 139 139 else { 140 140 timer = { 141 141 stdoutTime: RealDate.now(), 142 - stderrTime: RealDate.now(), 142 + stderrTime: 0, 143 143 } 144 144 timers.set(id, timer) 145 145 } ··· 178 178 else { 179 179 timer = { 180 180 stderrTime: RealDate.now(), 181 - stdoutTime: RealDate.now(), 181 + stdoutTime: 0, 182 182 } 183 183 timers.set(id, timer) 184 184 }
+65 -14
test/e2e/test/reporters/console.test.ts
··· 77 77 ], 78 78 }, [resolve('./fixtures/reporters/console-interleave.test.ts')]) 79 79 expect(stderr).toBe('') 80 - expect(logs).toMatchObject([ 81 - { 82 - type: 'stdout', 83 - content: expect.stringContaining('1'), 84 - }, 85 - { 86 - type: 'stderr', 87 - content: expect.stringContaining('2'), 88 - }, 89 - { 90 - type: 'stdout', 91 - content: expect.stringContaining('3'), 92 - }, 93 - ]) 80 + const formatted = logs.map((log, i) => 81 + ({ 82 + type: log.type, 83 + content: log.content.trim(), 84 + timeSign: i > 0 ? Math.sign(log.time - logs[i - 1].time) : undefined, 85 + })) 86 + expect(formatted).toMatchInlineSnapshot(` 87 + [ 88 + { 89 + "content": "1", 90 + "timeSign": undefined, 91 + "type": "stdout", 92 + }, 93 + { 94 + "content": "2", 95 + "timeSign": 1, 96 + "type": "stderr", 97 + }, 98 + { 99 + "content": "3", 100 + "timeSign": 1, 101 + "type": "stdout", 102 + }, 103 + ] 104 + `) 105 + }) 106 + 107 + test('console batching', async () => { 108 + const logs: UserConsoleLog[] = [] 109 + const { stderr } = await runVitest({ 110 + root: './fixtures/reporters/console-batch', 111 + reporters: [ 112 + { 113 + onUserConsoleLog(log) { 114 + logs.push(log) 115 + }, 116 + } satisfies Reporter, 117 + ], 118 + }) 119 + expect(stderr).toBe('') 120 + const formatted = logs.map((log, i) => 121 + ({ 122 + type: log.type, 123 + content: log.content.replace(/\n/g, '_'), 124 + timeSign: i > 0 ? Math.sign(log.time - logs[i - 1].time) : undefined, 125 + })) 126 + expect(formatted).toMatchInlineSnapshot(` 127 + [ 128 + { 129 + "content": "1_", 130 + "timeSign": undefined, 131 + "type": "stdout", 132 + }, 133 + { 134 + "content": "2_4_", 135 + "timeSign": 1, 136 + "type": "stdout", 137 + }, 138 + { 139 + "content": "3_", 140 + "timeSign": 1, 141 + "type": "stderr", 142 + }, 143 + ] 144 + `) 94 145 })
+11
test/e2e/fixtures/reporters/console-batch/basic.test.ts
··· 1 + import { it } from 'vitest' 2 + 3 + it('batch microtask', async () => { 4 + console.log('1') 5 + await new Promise(resolve => setTimeout(resolve, 100)) 6 + console.log('2') 7 + const now = Date.now() 8 + while (Date.now() < now + 50) {} 9 + console.error('3') // this gets own entry with timestamp after `2` 10 + console.log('4') // this is batched to the same stdout log as `2` 11 + })