Prevent duplicate snowpack logs (#316)

* Prevent duplicate snowpack logs

* Fix test to wait on expected messages

* Update the snowpack/plugin-vue

* Add changeset

* Debugging

* Skip the logging test on windows :(

* arg

8 files changed, 136 insertions, 8 deletions

diff --git a/.changeset/cool-pots-double.md b/.changeset/cool-pots-double.md
new file mode 100644
index 000000000..cb8c1dac1
--- /dev/null
+++ b/.changeset/cool-pots-double.md
@@ -0,0 +1,6 @@
+---
+'astro': patch
+'@astrojs/renderer-vue': patch
+---
+
+Updates logging to display messages from Snowpack
diff --git a/packages/astro/package.json b/packages/astro/package.json
index 280755239..d6e72b63d 100644
--- a/packages/astro/package.json
+++ b/packages/astro/package.json
@@ -104,7 +104,8 @@
     "@types/node": "^14.14.31",
     "@types/sass": "^1.16.0",
     "@types/yargs-parser": "^20.2.0",
-    "astro-scripts": "0.0.1"
+    "astro-scripts": "0.0.1",
+    "is-windows": "^1.0.2"
   },
   "engines": {
     "node": ">=14.0.0",
diff --git a/packages/astro/src/runtime.ts b/packages/astro/src/runtime.ts
index 86a816556..9b7aebae1 100644
--- a/packages/astro/src/runtime.ts
+++ b/packages/astro/src/runtime.ts
@@ -12,6 +12,7 @@ import { CompileError } from 'astro-parser';
 import { loadConfiguration, logger as snowpackLogger, startServer as startSnowpackServer } from 'snowpack';
 import { canonicalURL, getSrcPath, stopTimer } from './build/util.js';
 import { debug, info } from './logger.js';
+import { configureSnowpackLogger } from './snowpack-logger.js';
 import { searchForPage } from './search.js';
 import snowpackExternals from './external.js';
 
@@ -45,7 +46,7 @@ type LoadResultError = { statusCode: 500 } & ({ type: 'parse-error'; error: Comp
 export type LoadResult = (LoadResultSuccess | LoadResultNotFound | LoadResultRedirect | LoadResultError) & { collectionInfo?: CollectionInfo };
 
 // Disable snowpack from writing to stdout/err.
-snowpackLogger.level = process.argv.includes('--verbose') ? 'debug' : 'silent';
+configureSnowpackLogger(snowpackLogger);
 
 /** Pass a URL to Astro to resolve and build */
 async function load(config: RuntimeConfig, rawPathname: string | undefined): Promise<LoadResult> {
diff --git a/packages/astro/src/snowpack-logger.ts b/packages/astro/src/snowpack-logger.ts
new file mode 100644
index 000000000..0240e6c55
--- /dev/null
+++ b/packages/astro/src/snowpack-logger.ts
@@ -0,0 +1,34 @@
+import { logger as snowpackLogger } from 'snowpack';
+
+function verboseLogging() {
+  return process.argv.includes('--verbose');
+}
+
+const onceMessages = [
+  'Ready!',
+  'watching for file changes'
+].map(str => new RegExp(`\\[snowpack\\](.*?)${str}`));
+
+export function configureSnowpackLogger(logger: typeof snowpackLogger) {
+  const messageCache = new Set<string>();
+
+  if(verboseLogging()) {
+    logger.level = 'debug';
+  }
+
+  logger.on('info', message => {
+    // Cache messages that should only be shown once.
+    // This is due to having 2 snowpack instances. Once that is removed we can
+    // get rid of this workaround.
+    if(messageCache.has(message)) {
+      return;
+    }
+
+    const shouldBeCached = onceMessages.some(exp => exp.test(message));
+    if(shouldBeCached) {
+     messageCache.add(message);
+    }
+
+    console.log(message);
+  });
+}
\ No newline at end of file
diff --git a/packages/astro/test/helpers.js b/packages/astro/test/helpers.js
index 904cb0345..637fd5b37 100644
--- a/packages/astro/test/helpers.js
+++ b/packages/astro/test/helpers.js
@@ -4,6 +4,7 @@ import { readFile } from 'fs/promises';
 import { createRuntime } from '#astro/runtime';
 import { loadConfig } from '#astro/config';
 import execa from 'execa';
+import del from 'del';
 
 const MAX_STARTUP_TIME = 7000; // max time startup may take
 const MAX_TEST_TIME = 10000; // max time an individual test may take
@@ -93,3 +94,8 @@ export function runDevServer(root, additionalArgs = []) {
   const proc = execa('node', args);
   return proc;
 }
+
+export async function clearCache() {
+  const cacheDir = new URL('../../../node_modules/.cache', import.meta.url);
+  await del(fileURLToPath(cacheDir));
+}
\ No newline at end of file
diff --git a/packages/astro/test/snowpack-log.test.js b/packages/astro/test/snowpack-log.test.js
new file mode 100644
index 000000000..9bde02b19
--- /dev/null
+++ b/packages/astro/test/snowpack-log.test.js
@@ -0,0 +1,80 @@
+import { suite } from 'uvu';
+import * as assert from 'uvu/assert';
+import { clearCache, runDevServer } from './helpers.js';
+import isWindows from 'is-windows';
+
+// For some reason Windows isn't getting anything from stdout in this test, not sure why.
+if(!isWindows()) {
+  const SnowpackLogging = suite('snowpack logging');
+  const MAX_TEST_TIME = 10000; // max time this test suite may take
+
+  function numberOfEntries(stdout, message) {
+    const exp = new RegExp(message, 'g');
+    let count = 0;
+    let res;
+    while(res = exp.exec(stdout)) {
+      count++;
+    }
+    return count;
+  }
+
+  const root = new URL('./fixtures/astro/basic/', import.meta.url);
+  const timers = {};
+  let runError = null;
+  SnowpackLogging.before(async context => {
+    await clearCache();
+
+    let importantMessages = 0;
+    let stdout = '';
+    try {
+      const process = runDevServer(root, []);
+
+      process.stdout.setEncoding('utf8');
+      for await (const chunk of process.stdout) {
+        stdout += chunk;
+        if (/Server started/.test(chunk)) {
+          importantMessages++;
+        }
+        if(/Ready/.test(chunk)) {
+          importantMessages++;
+        }
+        if(/watching for file changes/.test(chunk)) {
+          importantMessages++;
+        }
+        if(importantMessages === 3) {
+          break;
+        }
+      }
+
+      context.stdout = stdout;
+      process.kill();
+    } catch(err) {
+      console.error(err);
+      runError = runError;
+    }
+  });
+
+  SnowpackLogging.before.each(({ __test__ }) => {
+    timers[__test__] = setTimeout(() => {
+      throw new Error(`Test "${__test__}" did not finish within allowed time`);
+    }, MAX_TEST_TIME);
+  });
+
+  SnowpackLogging('dev server started up', () => {
+    assert.equal(runError, null);
+  });
+
+  SnowpackLogging('Logs Ready message once', async ({ stdout }) => {
+    assert.equal(numberOfEntries(stdout, 'Ready'), 1);
+  });
+
+  SnowpackLogging('Logs [waiting for file changes] once', ({ stdout }) => {
+    assert.equal(numberOfEntries(stdout, 'watching for file changes'), 1);
+  })
+
+  SnowpackLogging.after.each(({ __test__ }) => {
+    clearTimeout(timers[__test__]);
+  });
+
+  SnowpackLogging.run();
+}
diff --git a/packages/renderers/renderer-vue/package.json b/packages/renderers/renderer-vue/package.json
index a9486073a..e4545a58a 100644
--- a/packages/renderers/renderer-vue/package.json
+++ b/packages/renderers/renderer-vue/package.json
@@ -11,6 +11,6 @@
   "dependencies": {
     "vue": "^3.0.10",
     "@vue/server-renderer": "^3.0.10",
-    "@snowpack/plugin-vue": "^2.6.0"
+    "@snowpack/plugin-vue": "^2.6.1"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 919e96315..1af5947c6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1338,10 +1338,10 @@
     svelte-hmr "^0.13.2"
     svelte-preprocess "^4.7.2"
 
-"@snowpack/plugin-vue@^2.6.0":
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/@snowpack/plugin-vue/-/plugin-vue-2.6.0.tgz#9e8ac6eeb15d5e17d3ca297364c140c96d88a667"
-  integrity sha512-kRjfSHMckf2wwPwpQdgDzxxX637rwC2MZIk9ib6GWlrvbFDAjLozeQMY883naQSu8RwZ4jUC0gW1OHzgz8lLPw==
+"@snowpack/plugin-vue@^2.6.1":
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/@snowpack/plugin-vue/-/plugin-vue-2.6.1.tgz#ef883dd0b666500d1f401c069d2623ea573ce8c4"
+  integrity sha512-UsnhuSDT7yzoKWBe4sKHmcA1hi9h66hF1Bds2aa6UUcYLPFYZiBozMCZecqQD4LEtHASuTydNET6BYqrmqoAaw==
   dependencies:
     "@rollup/plugin-replace" "^2.4.2"
     "@vue/compiler-sfc" "^3.0.10"
@@ -5454,7 +5454,7 @@ is-whitespace@^0.3.0:
   resolved "https://registry.yarnpkg.com/is-whitespace/-/is-whitespace-0.3.0.tgz#1639ecb1be036aec69a54cbb401cfbed7114ab7f"
   integrity sha1-Fjnssb4DauxppUy7QBz77XEUq38=
 
-is-windows@^1.0.0, is-windows@^1.0.1:
+is-windows@^1.0.0, is-windows@^1.0.1, is-windows@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.2.tgz#d1850eb9791ecd18e6182ce12a30f396634bb19d"
   integrity sha512-eXK1UInq2bPmjyX6e3VHIzMLobc4J94i4AWn+Hpq3OU5KkrRC96OAcR3PRJ/pGu6m8TRnBHP9dkXQVsT/COVIA==