Unify padding impls and consistently use them

src/compiler/core.ts

@@ -2051,4 +2051,19 @@ namespace ts {
             }
         }
     }
+
+    export function padLeft(s: string, length: number) {
+        while (s.length < length) {
+            s = " " + s;
+        }
+        return s;
+    }
+
+    export function padRight(s: string, length: number) {
+        while (s.length < length) {
+            s = s + " ";
+        }
+
+        return s;
+    }
 }

src/compiler/program.ts

@@ -383,13 +383,6 @@ namespace ts {
         return formatStyle + text + resetEscapeSequence;
     }
 
-    function padLeft(s: string, length: number) {
-        while (s.length < length) {
-            s = " " + s;
-        }
-        return s;
-    }
-
     function formatCodeSpan(file: SourceFile, start: number, length: number, indent: string, squiggleColor: ForegroundColorEscapeSequences, host: FormatDiagnosticsHost) {
         const { line: firstLine, character: firstLineChar } = getLineAndCharacterOfPosition(file, start);
         const { line: lastLine, character: lastLineChar } = getLineAndCharacterOfPosition(file, start + length);

src/executeCommandLine/executeCommandLine.ts

@@ -33,21 +33,6 @@ namespace ts {
         return options.pretty;
     }
 
-    function padLeft(s: string, length: number) {
-        while (s.length < length) {
-            s = " " + s;
-        }
-        return s;
-    }
-
-    function padRight(s: string, length: number) {
-        while (s.length < length) {
-            s = s + " ";
-        }
-
-        return s;
-    }
-
     function getOptionsForHelp(commandLine: ParsedCommandLine) {
         // Sort our options by their names, (e.g. "--noImplicitAny" comes before "--watch")
         return !!commandLine.options.all ?

src/harness/fourslashImpl.ts

@@ -1563,7 +1563,7 @@ namespace FourSlash {
             const output: string[] = [];
             for (let lineNumber = contextStart.line; lineNumber <= contextEnd.line; lineNumber++) {
                 const spanLine = contextString.substring(contextLineMap[lineNumber], contextLineMap[lineNumber + 1]);
-                output.push(lineNumbers ? `${`${lineNumber + 1}: `.padStart(lineNumberPrefixLength, " ")}${spanLine}` : spanLine);
+                output.push(lineNumbers ? `${ts.padLeft(`${lineNumber + 1}: `, lineNumberPrefixLength)}${spanLine}` : spanLine);
                 if (selection) {
                     if (lineNumber < selectionStart.line || lineNumber > selectionEnd.line) {
                         continue;