feat: don't redownload existing versions

bin/install-msedgedriver.js

@@ -4,7 +4,7 @@ require('../src/utils/throw-up');
 
 const got = require('got');
 const { promisify } = require('util');
-const fs = { ...require('fs'), ...require('fs').promises };
+const fs = { ...require('fs'), ...require('fs').promises, ...require('../src/fs') };
 const path = require('path');
 const extractZip = require('extract-zip');
 const pipeline = promisify(require('stream').pipeline);
@@ -85,7 +85,11 @@ async function install() {
 
   let driverPath = await getDriverPath(version, driverName);
 
-  await downloadAndExtract({ version, driverName, driverPath });
+  if (await fs.exists(driverPath)) {
+    console.log(`Found ${driverPath}, not downloading`);
+  } else {
+    await downloadAndExtract({ version, driverName, driverPath });
+  }
 
   console.log(`Edge WebDriver available at ${driverPath}`);
 

src/fs.js

@@ -0,0 +1,17 @@
+'use strict';
+
+const fs = { ...require('fs'), ...require('fs').promises };
+
+async function exists(path) {
+  try {
+    await fs.access(path, fs.constants.F_OK);
+
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+module.exports = {
+  exists,
+};

test/acceptance/install-msedgedriver-test.js

@@ -43,4 +43,16 @@ describe(path.basename(installerPath), function() {
 
     expect(ps.stdout).to.include(version);
   });
+
+  it('doesn\'t redownload same version', async function() {
+    let string = `Found ${driverPath}, not downloading`;
+
+    let ps = await execa.node(installerPath);
+
+    expect(ps.stdout).to.not.include(string);
+
+    ps = await execa.node(installerPath);
+
+    expect(ps.stdout).to.include(string);
+  });
 });