From 6a32006a78322d09f3542183a2aeff66116ceb44 Mon Sep 17 00:00:00 2001
From: Andrew Bradley <cspotcode@gmail.com>
Date: Sun, 26 Apr 2020 01:10:28 -0400
Subject: [PATCH 1/2] Fix interactive flag so that it forces REPL even when
 stdin is not a tty

---
 src/bin.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/bin.ts b/src/bin.ts
index 9d923967d..001e1f483 100644
--- a/src/bin.ts
+++ b/src/bin.ts
@@ -227,7 +227,8 @@ export function main (argv: string[]) {
       Module.runMain()
     } else {
       // Piping of execution _only_ occurs when no other script is specified.
-      if (process.stdin.isTTY) {
+      // --interactive flag forces REPL
+      if (interactive || process.stdin.isTTY) {
         startRepl(service, state, code)
       } else {
         let buffer = code || ''

From 9bd86e88ed7ee26c76f19da58919d6beb1bd84c4 Mon Sep 17 00:00:00 2001
From: Andrew Bradley <cspotcode@gmail.com>
Date: Sun, 26 Apr 2020 01:31:30 -0400
Subject: [PATCH 2/2] Add test

---
 src/index.spec.ts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/index.spec.ts b/src/index.spec.ts
index ce3ba1639..8e7007175 100644
--- a/src/index.spec.ts
+++ b/src/index.spec.ts
@@ -260,6 +260,21 @@ describe('ts-node', function () {
       cp.stdin!.end('true')
     })
 
+    it('should run REPL when --interactive passed and stdin is not a TTY', function (done) {
+      const cp = exec(`${cmd} --interactive`, function (err, stdout) {
+        expect(err).to.equal(null)
+        expect(stdout).to.equal(
+          '> 123\n' +
+          'undefined\n' +
+          '> '
+        )
+        return done()
+      })
+
+      cp.stdin!.end('console.log("123")\n')
+
+    })
+
     it('should support require flags', function (done) {
       exec(`${cmd} -r ./tests/hello-world -pe "console.log('success')"`, function (err, stdout) {
         expect(err).to.equal(null)