Commit 700bd4c

@@ -0,0 +1,44 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import assert from 'node:assert'
+import { Readable, Writable } from 'node:stream'
+import { expectType } from 'tsd'
+import { $, ProcessPromise, ProcessOutput, within } from '../src/core.js'
+
+let p = $`cmd`
+assert(p instanceof ProcessPromise)
+expectType<ProcessPromise>(p)
+expectType<Writable>(p.stdin)
+expectType<Readable>(p.stdout)
+expectType<Readable>(p.stderr)
+expectType<ProcessPromise>(p.nothrow())
+expectType<ProcessPromise>(p.quiet())
+expectType<ProcessPromise>(p.pipe($`cmd`))
+expectType<ProcessPromise>(p.stdio('pipe'))
+expectType<ProcessPromise>(p.timeout('1s'))
+expectType<Promise<void>>(p.kill())
+expectType<Promise<ProcessOutput>>(p.then(p => p))
+expectType<Promise<any>>(p.catch(p => p))
+
+let o = await p
+assert(o instanceof ProcessOutput)
+expectType<ProcessOutput>(o)
+expectType<string>(o.stdout)
+expectType<string>(o.stderr)
+expectType<number | null>(o.exitCode)
+expectType<NodeJS.Signals | null>(o.signal)
+
+expectType<'banana'>(within(() => 'apple' as 'banana'))
+