feat: add POSIX null command : as a builtin#175
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`:` is POSIX's null command: it discards its arguments and always exits 0. Bash treats it as a builtin. We had `true` and `false` already; add `:` alongside them (same `ExitCodeCommand(0)` underneath). Without this, `deno task` for a `package.json` script defined as `"test": ":"` (a common no-op pattern, e.g. used in the aube benchmark fixture's ~1400-package project) fails with `:: command not found` and exit code 127, while bash / sh / dash all return 0 cleanly. Adds an integration test covering the bare `:`, argument discarding, and `&&` / `||` short-circuit behavior.
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bartlomieju
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May 20, 2026
Picks up denoland/deno_task_shell#175, which adds the POSIX `:` (null command) as a shell builtin alongside `true` and `false`. Without it `deno task` fails with `:: command not found` (exit 127) on any package.json whose script is the bare colon no-op, e.g. the `"test": ":"` script in the aube benchmark fixture (https://aube.en.dev/benchmarks.html) that previously prevented Deno from completing the install-test scenario at all. Verified locally: `deno task test` against a minimal `{ "scripts": { "test": ":" } }` package now exits 0.
bartlomieju
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May 20, 2026
Picks up two upstream changes in deno_task_shell: support for `set -e` / `set +e` (and the `set -o errexit` long form), which aborts the surrounding sequential list on the first non-zero exit, and the POSIX null command `:` as a builtin. See denoland/deno_task_shell#171 and denoland/deno_task_shell#175.
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:is POSIX's null command: it discards its arguments and alwaysexits 0. Bash treats it as a builtin. We had
trueandfalsealready; add
:alongside them (sameExitCodeCommand(0)underneath).Without this,
deno taskfor apackage.jsonscript defined as"test": ":"(a common no-op pattern, e.g. used in the aube benchmarkfixture at https://aube.en.dev/benchmarks.html on a ~1400-package
project) fails with
:: command not foundand exit code 127, whilebash / sh / dash all return 0 cleanly. As a result the benchmark's
install-testscenario for Deno can never complete.Adds an integration test covering the bare
:, argument discarding,and
&&/||short-circuit behavior.