Normalize signature of encodeCommand

src/PrinterUsbManager.ts

@@ -14,8 +14,9 @@ export interface PrinterManagerEventMap {
  * a printer using the browser's UI. Once paired at least once the browser will rember and reconnect
  * automatically.
  *
- * This class exposes two events, which your code should add handlers for:
- * *
+ * This class exposes events, which your code should add handlers for:
+ * * connectedPrinter: Fired when a printer is ready to be interacted with.
+ * * disconnectedPrinter: Fired when a printer is no longer connected.
  *
  * This class will bind to WebUSB events on the Navigator element, your code should ensure only
  * one instance is ever instantiated to avoid conflicts.

src/Printers/Languages/EplPrinterCommandSet.ts

@@ -29,7 +29,7 @@ export class EplPrinterCommandSet extends PrinterCommandSet {
     get formEndCommand(): Uint8Array {
         // There's no formal command for the end of an EPL doc, but just in case
         // add a newline.
-        return this.encodeCommand('');
+        return this.encodeCommand();
     }
 
     protected nonFormCommands: (symbol | Commands.CommandType)[] = [
@@ -49,7 +49,7 @@ export class EplPrinterCommandSet extends PrinterCommandSet {
         [Commands.CommandType.CommandCustomSpecificCommand, this.unprocessedCommand],
         [Commands.CommandType.CommandLanguageSpecificCommand, this.unprocessedCommand],
         // Actually valid commands to parse
-        [Commands.CommandType.OffsetCommand, this.modifyOffset.bind(this)],
+        [Commands.CommandType.OffsetCommand, this.modifyOffset],
         [Commands.CommandType.ClearImageBufferCommand, () => this.formStartCommand],
         [Commands.CommandType.CutNowCommand, () => this.encodeCommand('C')],
         // EPL uses an on/off style for form backup, it'll remain off until reenabled.
@@ -95,7 +95,7 @@ export class EplPrinterCommandSet extends PrinterCommandSet {
         }
     }
 
-    public encodeCommand(str: string, withNewline = true): Uint8Array {
+    public encodeCommand(str = '', withNewline = true): Uint8Array {
         // Every command in EPL ends with a newline.
         return this.encoder.encode(str + (withNewline ? '\r\n' : ''));
     }

src/Printers/Languages/PrinterCommandSet.ts

@@ -14,7 +14,7 @@ type RawCommandForm = { commands: Array<Commands.IPrinterCommand>; withinForm: b
 
 export abstract class PrinterCommandSet {
     /** Encode a raw string command into a Uint8Array according to the command language rules. */
-    public abstract encodeCommand(str: string): Uint8Array;
+    public abstract encodeCommand(str?: string, withNewline?: boolean): Uint8Array;
 
     private readonly _noop = new Uint8Array();
     /** Get an empty command to be used as a no-op. */
@@ -94,7 +94,7 @@ export abstract class PrinterCommandSet {
             }
             return this.combineCommands(accumulator as Uint8Array, cmd);
             // We start with an explicit newline, to avoid possible previous commands partially sent
-        }, this.encodeCommand(''));
+        }, this.encodeCommand());
 
         const out = new CompiledDocument(this.commandLanguage, effects, buffer);
         return Object.freeze(out);

src/Printers/Languages/ZplPrinterCommandSet.ts

@@ -27,7 +27,7 @@ export class ZplPrinterCommandSet extends PrinterCommandSet {
         return this.encodeCommand('\n^XZ\n');
     }
 
-    encodeCommand(str: string, withNewline = true): Uint8Array {
+    encodeCommand(str = '', withNewline = true): Uint8Array {
         // TODO: ZPL supports omitting the newline, figure out a clever way to
         // handle situations where newlines are optional to reduce line noise.
         return this.encoder.encode(str + (withNewline ? '\n' : ''));