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Sample

vitest 4.1.10: Parse CLI arguments with parseCLI in vitest/node to enforce binary token validation, route positional test filters, normalize boolean and dot-notation options, and configure execution modes.

Verified sample for npm vitest 4.1.10: Parse CLI arguments with parseCLI in vitest/node to enforce binary token validation, route positional test filters…

sha256:dc72c5ce7ac8e03a65cf326f0f36a6c1b4ff8a8463df4f6ec32412c841ce1227

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
3
Signing keys that built it
3
Declared environment node linux x64 node node npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-17
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-18
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-09-08

Case

HOW
Goal
Parse CLI arguments with parseCLI in vitest/node to enforce binary token validation, route positional test filters, normalize boolean and dot-notation options, and configure execution modes.
Packages
Symbols
  • parseCLI
Environment
node
Created
2026-08-17T11:56:17Z

Contract

  1. parseCLI requires 'vitest' as the leading argument token and transforms positional arguments into filter paths while mapping flags to normalized options
  2. assert parseCLI rejects leading binary tokens other than 'vitest' with a descriptive Error
  3. assert 'run' mode populates options.run, extracts positional test file paths into filter array, maps --no-isolate to isolate: false, and casts --bail to number
  4. assert 'watch' mode populates options.watch and nests dot-notation flags like --browser.name into options.browser object
  5. assert repeated flags like --reporter accumulate into array, --coverage expands to { enabled: true }, and --testTimeout parses as numeric value
  6. assert 'related' mode stores file targets in options.related, defaults passWithNoTests to true, and resets filter array to empty
  7. assert passthrough arguments after double dash are preserved in options['--']

Files

  • NOTES.md
  • csx.json
  • package-lock.json
  • package.json
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

NOTES.md
# Vitest CLI Parsing with `parseCLI`

## Prior Search
Calling `search_known_solution` on `vitest` returned existing samples covering `vi.fn` invocation call order (`sha256:08ce35c85a89fdd63e12e8a02a77e7a05658eeac84405e357d1360989ffceae3`), mock reset/restore lifecycle (`sha256:a350424c5d64bcc9345e88b627b3e25cacd32397623de4fa03f37487f70819a2`), and test environment/docblock resolution (`sha256:e949d296b4b86f64c795f4aaf4915e41f0e6d78206d3732bfffc80877456b1a3`). CLI parsing via `vitest/node` had no existing sample.

## Pinned Release
- `vitest@4.1.10`

## Observed Behaviour
The `parseCLI` function exported from `vitest/node` provides programmatic parsing of CLI arguments into `{ filter, options }`:

1. **Binary Token Validation**: The first token in the provided argument array or space-separated command string must be `"vitest"`. If another token (such as `"node"`) is passed first, `parseCLI` throws an `Error: Expected "vitest" as the first argument, received "<token>"`.
2. **Positional Filter Separation**: Positional arguments representing target test files or directory paths are separated into the `filter` array, distinct from configuration flags.
3. **Execution Modes**:
   - `vitest run` marks `options.run = true`.
   - `vitest watch` marks `options.watch = true`.
   - `vitest related file1.ts file2.ts` routes the file targets into `options.related = ['file1.ts', 'file2.ts']`, leaves `filter = []`, and sets `options.passWithNoTests = true`.
4. **Option Normalization & Dot Notation**:
   - Dot-notation flags such as `--browser.name=firefox --browser.headless` expand into nested objects `{ browser: { name: 'firefox', headless: true } }`.
   - Boolean negations such as `--no-isolate` normalize to `{ isolate: false }`.
   - `--coverage` normalizes to `{ coverage: { enabled: true } }`.
   - Repeated options like `--reporter=json --reporter=tap` collect into an array `['json', 'tap']`.
   - Numeric options like `--bail=2` and `--testTimeout=4000` parse as JavaScript numbers.
   - Passthrough arguments following `--` are preserved in `options['--']`.
csx.json
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package.json
{
  "name": "npm-vitest-version-depth",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "vitest": "4.1.10"
  }
}
test/contract.mjs
import assert from 'node:assert';
import { parseCLI } from 'vitest/node';

// 1. First argument must be "vitest"
assert.throws(
  () => parseCLI(['node', 'vitest', 'run']),
  (err) => {
    assert.strictEqual(err instanceof Error, true);
    assert.strictEqual(err.message, 'Expected "vitest" as the first argument, received "node"');
    return true;
  },
  'expected parseCLI to reject non-vitest leading binary token'
);

// 2. Command mode "run", positional test filters, boolean negation, and numeric coercion
const runResult = parseCLI('vitest run test/unit.test.ts src/api.test.ts --no-isolate --bail=2');
assert.deepStrictEqual(runResult.filter, ['test/unit.test.ts', 'src/api.test.ts']);
assert.strictEqual(runResult.options.run, true);
assert.strictEqual(runResult.options.isolate, false);
assert.strictEqual(runResult.options.bail, 2);
assert.strictEqual(runResult.options.color, true);

// 3. Command mode "watch" and dot-notation property nesting
const watchResult = parseCLI('vitest watch --browser.name=firefox --browser.headless');
assert.deepStrictEqual(watchResult.filter, []);
assert.strictEqual(watchResult.options.watch, true);
assert.deepStrictEqual(watchResult.options.browser, {
  name: 'firefox',
  headless: true
});

// 4. Repeated option aggregation, coverage flag object normalization, and timeout casting
const multiOptionResult = parseCLI('vitest run --coverage --reporter=json --reporter=tap --testTimeout=4000');
assert.deepStrictEqual(multiOptionResult.filter, []);
assert.deepStrictEqual(multiOptionResult.options.coverage, { enabled: true });
assert.deepStrictEqual(multiOptionResult.options.reporter, ['json', 'tap']);
assert.strictEqual(multiOptionResult.options.testTimeout, 4000);

// 5. "related" mode captures files into options.related and defaults passWithNoTests to true
const relatedResult = parseCLI('vitest related src/math.ts src/utils.ts');
assert.deepStrictEqual(relatedResult.filter, []);
assert.deepStrictEqual(relatedResult.options.related, ['src/math.ts', 'src/utils.ts']);
assert.strictEqual(relatedResult.options.passWithNoTests, true);

// 6. Double dash passthrough arguments preservation
const passthroughResult = parseCLI('vitest run -- --custom-flag extra-arg');
assert.deepStrictEqual(passthroughResult.options['--'], ['--custom-flag', 'extra-arg']);

console.log('vitest-parseCLI-contract-passed');

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