Drop @proc7ts/push-iterator dependency

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@run-z/optionz",
-  "version": "1.1.0",
+  "version": "2.0.0-dev.0",
   "description": "Run-z command line options parser",
   "keywords": [
     "cli",
@@ -36,7 +36,6 @@
   },
   "dependencies": {
     "@proc7ts/primitives": "^1.1.0",
-    "@proc7ts/push-iterator": "^2.0.0",
     "string-width": "^4.2.0",
     "wrap-ansi": "^7.0.0"
   },

src/help/help-formatter.ts

@@ -2,7 +2,6 @@
  * @packageDocumentation
  * @module @run-z/optionz/help
  */
-import { flatMapIt, itsReduction } from '@proc7ts/push-iterator';
 import stringWidth from 'string-width';
 import wrapAnsi from 'wrap-ansi';
 import { clz } from '../colors';
@@ -19,14 +18,12 @@ export class ZHelpFormatter {
    * @param options  A list of options meta to format.
    */
   usageWidth(options: ZOptionMeta.List): number {
-    return itsReduction(
-        flatMapIt(
-            options,
-            ([, { usage }]) => usage,
-        ),
-        (prev, usage) => Math.max(prev, stringWidth(usage)),
-        0,
-    );
+    return options
+        .flatMap(([, { usage }]) => usage)
+        .reduce(
+            (prev, usage) => Math.max(prev, stringWidth(usage)),
+            0,
+        );
   }
 
   /**

src/option-syntax.ts

@@ -3,7 +3,6 @@
  * @module @run-z/optionz
  */
 import { isArrayOfElements } from '@proc7ts/primitives';
-import { filterIt, flatMapIt } from '@proc7ts/push-iterator';
 import { ZOptionInput } from './option-input';
 
 /**
@@ -20,7 +19,7 @@ export type ZOptionSyntax =
  *
  * @returns An iterable of option inputs. May be empty if the command line argument has another syntax.
  */
-    (this: void, args: readonly [string, ...string[]]) => Iterable<ZOptionInput>;
+    (this: void, args: readonly [string, ...string[]]) => readonly ZOptionInput[];
 
 /**
  * @internal
@@ -114,33 +113,27 @@ function zOptionSyntaxBy(syntax: ZOptionSyntax | readonly ZOptionSyntax[]): ZOpt
     return syntax;
   }
 
-  return args => {
+  return (args: readonly [string, ...string[]]): readonly ZOptionInput[] => {
 
     const tried: ZOptionInput[] = [];
 
-    return filterIt(
-        flatMapIt(
-            syntax,
-            p => p(args),
-        ),
-        input => {
-          // Prevent input duplicates
-          if (tried.some(t => ZOptionInput.equal(t, input))) {
-            return false;
-          }
-
-          tried.push(input);
-
-          return true;
-        },
-    );
+    return syntax.flatMap(p => p(args)).filter(input => {
+      // Prevent input duplicates
+      if (tried.some(t => ZOptionInput.equal(t, input))) {
+        return false;
+      }
+
+      tried.push(input);
+
+      return true;
+    });
   };
 }
 
 /**
  * @internal
  */
-function longZOptionSyntax(args: readonly [string, ...string[]]): Iterable<ZOptionInput> {
+function longZOptionSyntax(args: readonly [string, ...string[]]): readonly ZOptionInput[] {
 
   let [name] = args;
 
@@ -181,7 +174,7 @@ function longZOptionSyntax(args: readonly [string, ...string[]]): Iterable<ZOpti
 /**
  * @internal
  */
-function shortZOptionSyntax(args: readonly [string, ...string[]]): Iterable<ZOptionInput> {
+function shortZOptionSyntax(args: readonly [string, ...string[]]): readonly ZOptionInput[] {
 
   let [name] = args;
 
@@ -243,7 +236,7 @@ function shortZOptionSyntax(args: readonly [string, ...string[]]): Iterable<ZOpt
 /**
  * @internal
  */
-function anyZOptionSyntax(args: readonly [string, ...string[]]): Iterable<ZOptionInput> {
+function anyZOptionSyntax(args: readonly [string, ...string[]]): readonly ZOptionInput[] {
 
   const [name] = args;
   const values = ZOptionInput.valuesOf(args, 1);

tsconfig.json

@@ -15,7 +15,8 @@
     "importHelpers": true,
     "noEmitHelpers": true,
     "lib": [
-      "ES2018"
+      "ES2018",
+      "ES2019.Array"
     ],
     "types": [
       "jest",