From 40aa0c5519eb0c2f90b8575038cd5ab11b9e8719 Mon Sep 17 00:00:00 2001
From: Guy Bedford <guybedford@gmail.com>
Date: Sun, 13 May 2018 20:18:07 +0200
Subject: [PATCH 1/2] support .lastLine()

---
 src/MagicString.js  | 40 ++++++++++++++++++++++++++++++++++++++++
 test/MagicString.js | 23 +++++++++++++++++++++++
 2 files changed, 63 insertions(+)

diff --git a/src/MagicString.js b/src/MagicString.js
index e73353a..47c1503 100644
--- a/src/MagicString.js
+++ b/src/MagicString.js
@@ -7,6 +7,8 @@ import getLocator from './utils/getLocator.js';
 import Mappings from './utils/Mappings.js';
 import Stats from './utils/Stats.js';
 
+const n = '\n';
+
 const warned = {
 	insertLeft: false,
 	insertRight: false,
@@ -460,6 +462,8 @@ export default class MagicString {
 	}
 
 	lastChar() {
+		if (this.outro.length)
+			return this.outro[this.outro.length - 1];
 		let chunk = this.lastChunk;
 		do {
 			if (chunk.outro.length)
@@ -469,9 +473,45 @@ export default class MagicString {
 			if (chunk.intro.length)
 				return chunk.intro[chunk.intro.length - 1];
 		} while (chunk = chunk.previous);
+		if (this.intro.length)
+			return this.intro[this.intro.length - 1];
 		return '';
 	}
 
+	lastLine() {
+		let lineIndex = this.outro.lastIndexOf(n);
+		if (lineIndex !== -1)
+			return this.outro.substr(lineIndex + 1);
+		let lineStr = this.outro;
+		let chunk = this.lastChunk;
+		do {
+			if (chunk.outro.length > 0) {
+				lineIndex = chunk.outro.lastIndexOf(n);
+				if (lineIndex !== -1)
+					return chunk.outro.substr(lineIndex + 1) + lineStr;
+				lineStr = chunk.outro + lineStr;
+			}
+
+			if (chunk.content.length > 0) {
+				lineIndex = chunk.content.lastIndexOf(n);
+				if (lineIndex !== -1)
+					return chunk.content.substr(lineIndex + 1) + lineStr;
+				lineStr = chunk.content + lineStr;
+			}
+
+			if (chunk.intro.length > 0) {
+				lineIndex = chunk.intro.lastIndexOf(n);
+				if (lineIndex !== -1)
+					return chunk.intro.substr(lineIndex + 1) + lineStr;
+				lineStr = chunk.intro + lineStr;
+			}
+		} while (chunk = chunk.previous);
+		lineIndex = this.intro.lastIndexOf(n);
+		if (lineIndex !== -1)
+			return this.intro.substr(lineIndex + 1) + lineStr;
+		return this.intro + lineStr;
+	}
+
 	slice(start = 0, end = this.original.length) {
 		while (start < 0) start += this.original.length;
 		while (end < 0) end += this.original.length;
diff --git a/test/MagicString.js b/test/MagicString.js
index 5726f8e..80421b7 100644
--- a/test/MagicString.js
+++ b/test/MagicString.js
@@ -1191,4 +1191,27 @@ describe( 'MagicString', () => {
 			assert.equal( s.isEmpty(), true );
 		});
 	});
+
+	describe( 'lastLine', () => {
+		it( 'should support lastLine', () => {
+			const s = new MagicString( ' abcde\nfghijkl ' );
+
+			assert.equal( s.lastLine(), 'fghijkl ' );
+
+			s.prepend( '  ' );
+			s.append( '  ' );
+			s.remove( 1, 6 );
+			s.remove( 9, 15 );
+
+			assert.equal( s.lastLine(), 'fg  ' );
+
+			s.overwrite( 7, 8, '\n' );
+
+			assert.equal( s.lastLine(), 'g  ' );
+
+			s.append('\n//lastline');
+
+			assert.equal( s.lastLine(), '//lastline' );
+		});
+	});
 });

From 477c93a1cd599ce5bd3f3e5888cc9b399156da89 Mon Sep 17 00:00:00 2001
From: Guy Bedford <guybedford@gmail.com>
Date: Sun, 13 May 2018 20:21:51 +0200
Subject: [PATCH 2/2] update typing

---
 index.d.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/index.d.ts b/index.d.ts
index 5d9e1e1..f725754 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -93,6 +93,8 @@ export default class MagicString {
   snip(start: number, end: number): MagicString;
   trim(): MagicString;
 
+  lastChar(): string;
+  lastLine(): string;
   isEmpty(): boolean;
 
   original: string;