Support for flow

Close #562
Close #561

bin/jack.js

@@ -559,6 +559,9 @@ Much more documentation available at: https://www.node-tap.org/
     description: `Run .js and .mjs with support for EcmaScript modules
                   (Default: true)`,
   }),
+  flow: flag({
+    description: `Removes flow types`,
+  }),
 
   ts: flag({
     default: process.env.TAP_NO_TS !== '1',

bin/run.js

@@ -14,6 +14,7 @@ const path = require('path')
 const exists = require('fs-exists-cached').sync
 const os = require('os')
 const tsNode = require.resolve('ts-node/register')
+const flowNode = require.resolve("flow-remove-types/register");
 const esm = require.resolve('esm')
 const jsx = require.resolve('./jsx.js')
 const mkdirp = require('mkdirp').sync
@@ -22,6 +23,7 @@ const {ProcessDB} = require('istanbul-lib-processinfo')
 const rimraf = require('rimraf').sync
 const {Repl} = require('../lib/repl.js')
 
+
 /* istanbul ignore next */
 const debug = process.env.TAP_DEBUG === '1'
   || /\btap\b/.test(process.env.NODE_DEBUG) ? (...args) => {
@@ -602,6 +604,9 @@ const runAllFiles = (options, tap) => {
       if (options.jobs > 1)
         opt.buffered = isParallelOk(parallelOk, file) !== false
 
+      if (options.flow)
+        options['node-arg'].push('-r', flowNode)
+
       if (options.ts && /\.tsx?$/.test(file)) {
         debug('ts file', file)
         const compilerOpts = JSON.stringify({

package.json

@@ -26,6 +26,7 @@
     "domain-browser": "^1.2.0",
     "esm": "^3.2.25",
     "findit": "^2.0.0",
+    "flow-remove-types": "^2.99.0",
     "foreground-child": "^1.3.3",
     "fs-exists-cached": "^1.0.0",
     "function-loop": "^1.0.2",

tap-snapshots/test-run-dump-config.js-TAP.test.js

@@ -19,6 +19,7 @@ coverage-report: []
 debug: false
 esm: false
 files: []
+flow: false
 functions: 100
 grep: []
 help: false
@@ -67,6 +68,7 @@ coverage-report: []
 debug: false
 esm: false
 files: []
+flow: false
 functions: 100
 grep: []
 help: false
@@ -115,6 +117,7 @@ coverage-report: []
 debug: false
 esm: false
 files: []
+flow: false
 functions: 100
 grep: []
 help: false
@@ -163,6 +166,7 @@ coverage-report: []
 debug: false
 esm: false
 files: []
+flow: false
 functions: 100
 grep: []
 help: false
@@ -211,6 +215,7 @@ coverage-report: []
 debug: false
 esm: false
 files: []
+flow: false
 functions: 100
 grep: []
 help: false
@@ -259,6 +264,7 @@ coverage-report: []
 debug: false
 esm: false
 files: []
+flow: false
 functions: 100
 grep: []
 help: false
@@ -309,6 +315,7 @@ coverage-report:
 debug: true
 esm: false
 files: []
+flow: false
 functions: 100
 grep:
   - x
@@ -368,6 +375,7 @@ coverage-report: []
 debug: false
 esm: false
 files: []
+flow: false
 functions: 100
 grep: []
 help: false

tap-snapshots/test-run-flow.js-TAP.test.js

@@ -0,0 +1,32 @@
+/* IMPORTANT
+ * This snapshot file is auto-generated, but designed for humans.
+ * It should be checked into source control and tracked carefully.
+ * Re-generate by setting TAP_SNAPSHOT=1 and running tests.
+ * Make sure to inspect the output below.  Do not ignore changes!
+ */
+'use strict'
+exports[`test/run/flow.js TAP flow > must match snapshot 1`] = `
+TAP version 13
+ok 1 - cli-tests/flow/ok.js # {time} {
+    ok 1 - this is fine
+    1..1
+    # {time}
+}
+
+1..1
+# {time}
+
+`
+
+exports[`test/run/flow.js TAP flow manually > must match snapshot 1`] = `
+TAP version 13
+ok 1 - cli-tests/flow/ok2.js # {time} {
+    ok 1 - this is fine
+    1..1
+    # {time}
+}
+
+1..1
+# {time}
+
+`

test/run/flow.js

@@ -0,0 +1,45 @@
+const {
+  tmpfile,
+  run,
+  tap,
+  t,
+} = require('./')
+
+
+t.test('flow', t => {
+  const ok = tmpfile(t, 'flow/ok.js', `
+    // @flow
+    const t = require(${tap})
+    function square(n: number): number {
+      return n * n;
+    }
+    t.pass('this is fine')
+  `)
+
+  const args = [ok, '--flow']
+
+  run(args, {}, (er, o, e) => {
+    t.equal(er, null)
+    t.matchSnapshot(o)
+    t.end()
+  })
+})
+
+t.test('flow manually', t => {
+  const ok = tmpfile(t, 'flow/ok2.js', `
+    // @flow
+    const t = require(${tap})
+    function square(n: number): number {
+      return n * n;
+    }
+    t.pass('this is fine')
+  `)
+
+  const args = [ok, '--node-arg=--require', '--node-arg=flow-remove-types/register']
+
+  run(args, {}, (er, o, e) => {
+    t.equal(er, null)
+    t.matchSnapshot(o)
+    t.end()
+  })
+})