Minor CLI and README cleanup

cli/util/colors.d.ts

@@ -0,0 +1,50 @@
+interface Colors {
+  /** Whether terminal colors are supported. */
+  supported: boolean;
+  /** Colors a string in gray if {@link supported}. */
+  gray(text: string): string;
+  /** Colors a string in red if {@link supported}. */
+  red(text: string): string;
+  /** Colors a string in green if {@link supported}. */
+  green(text: string): string;
+  /** Colors a string in yellow if {@link supported}. */
+  yellow(text: string): string;
+  /** Colors a string in blue if {@link supported}. */
+  blue(text: string): string;
+  /** Colors a string in magenta if {@link supported}. */
+  magenta(text: string): string;
+  /** Colors a string in cyan if {@link supported}. */
+  cyan(text: string): string;
+  /** Colors a string in white if {@link supported}. */
+  white(text: string): string;
+}
+
+interface Exports extends Colors {
+  /** Standard output wrapper. */
+  stdout: Colors;
+  /** Standard error wrapper. */
+  stderr: Colors;
+  /** Creates an instance for the specified stream. */
+  from(stream: any, base?: {}): Colors;
+  /** Gray color escape sequence. */
+  GRAY: string;
+  /** Red color escape sequence. */
+  RED: string;
+  /** Green color escape sequence. */
+  GREEN: string;
+  /** Yellow color escape sequence. */
+  YELLOW: string;
+  /** Blue color escape sequence. */
+  BLUE: string;
+  /** Magenta color escape sequence. */
+  MAGENTA: string;
+  /** Cyan color escape sequence. */
+  CYAN: string;
+  /** White color escape sequence. */
+  WHITE: string;
+  /** Reset color escape sequence. */
+  RESET: string;
+}
+
+declare const colors: Exports;
+export = colors;