Replace DevTools semver usages with a simpler inlined method

Author: markerikson

packages/react-devtools-shared/src/backend/renderer.js

@@ -7,7 +7,6 @@
  * @flow
  */
 
-import {gt, gte} from 'semver';
 import {
   ComponentFilterDisplayName,
   ComponentFilterElementType,
@@ -142,6 +141,29 @@ type ReactPriorityLevelsType = {
   NoPriority: number,
 };
 
+// https://www.npmjs.com/package/semver-compare
+function semvercmp(a: string = '', b: string = '') {
+  const pa = a.split('.');
+  const pb = b.split('.');
+  for (var i = 0; i < 3; i++) {
+    const na = Number(pa[i]);
+    const nb = Number(pb[i]);
+    if (na > nb) return 1;
+    if (nb > na) return -1;
+    if (!isNaN(na) && isNaN(nb)) return 1;
+    if (isNaN(na) && !isNaN(nb)) return -1;
+  }
+  return 0;
+}
+
+function gt(a: string = '', b: string = '') {
+  return semvercmp(a, b) === 1;
+}
+
+function gte(a: string = '', b: string = '') {
+  return semvercmp(a, b) > -1;
+}
+
 function getFiberFlags(fiber: Fiber): number {
   // The name of this field changed from "effectTag" to "flags"
   return fiber.flags !== undefined ? fiber.flags : (fiber: any).effectTag;

packages/react-devtools-shell/src/e2e-regression/app-legacy.js

@@ -4,11 +4,29 @@
 
 import * as React from 'react';
 import * as ReactDOM from 'react-dom';
-import {gte} from 'semver';
 import ListApp from '../e2e-apps/ListApp';
 import ListAppLegacy from '../e2e-apps/ListAppLegacy';
 const version = process.env.E2E_APP_REACT_VERSION;
 
+// https://www.npmjs.com/package/semver-compare
+function semvercmp(a: string = '', b: string = '') {
+  const pa = a.split('.');
+  const pb = b.split('.');
+  for (var i = 0; i < 3; i++) {
+    const na = Number(pa[i]);
+    const nb = Number(pb[i]);
+    if (na > nb) return 1;
+    if (nb > na) return -1;
+    if (!isNaN(na) && isNaN(nb)) return 1;
+    if (isNaN(na) && !isNaN(nb)) return -1;
+  }
+  return 0;
+}
+
+function gte(a: string = '', b: string = '') {
+  return semvercmp(a, b) > -1;
+}
+
 function mountApp(App: () => React$Node) {
   const container = document.createElement('div');