add popLine function

Author: kermanx

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "utty-node",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "An impl of utty for nodejs tty.",
   "main": "build/index.js",
   "types": "build/index.d.ts",
@@ -40,7 +40,7 @@
     "@types/node": "^17.0.8",
     "nodeliketty": "^1.0.2",
     "strip-ansi": "^7.0.1",
-    "utty": "^1.0.0"
+    "utty": "^1.0.1"
   },
   "jest": {
     "extensionsToTreatAsEsm": [

package.json

@@ -26,6 +26,14 @@ describe("Test UNodeTty", () => {
     lines[4] = "";
     expect(fake.lines).toEqual(lines);
   });
+  it("should be able to pop a line correctly",()=>{
+    t.popLine();
+    lines.pop();
+    lines.pop();
+    lines.push("");
+    lines.push("");
+    expect(fake.lines).toEqual(lines);
+  });
   it("should be able to be resized correctly", () => {
     let called = false;
     let fn = () => {

src/index.test.ts

@@ -1,6 +1,6 @@
 import UTty from "utty";
 import stripAnsi from "strip-ansi";
-import NodeLikeTty from "nodeliketty";
+import NodeLikeTty, { Direction } from "nodeliketty";
 
 export default class UNodeTty implements UTty {
   constructor(tty: NodeLikeTty) {
@@ -44,7 +44,7 @@ export default class UNodeTty implements UTty {
     if (add) this.nLine += dLine;
   }
 
-  _clearLine(dir: -1 | 0 | 1 = 0): void {
+  _clearLine(dir: Direction = 0): void {
     this.tty.clearLine(dir);
   }
 
@@ -102,6 +102,12 @@ export default class UNodeTty implements UTty {
     this._write(str + "\n", true);
   }
 
+  popLine():void{
+    this.nLine--;
+    this._toNewLine();
+    this._clearLine();
+  }
+
   getStrDisplayWidth(str: string): number {
     return stripAnsi(str).length;
     //return str.length;