当 运行 背靠背时，Meteor 构建失败

Meteor build fails when run back to back

我正在尝试了解 Meteor 构建过程，以提高我的 dockerized Meteor 应用程序的性能。我发现如果我 运行 meteor build build --directory --server-only 两次，背靠背，我会收到关于无法在第二个 运行.[=15 上解析 json 的错误=]

这是第一个成功的运行：

 ❯❯❯ meteor build build --directory --server-only

WARNING: The output directory is under your source tree.
         Your generated files may get interpreted as source code!
         Consider building into a different directory instead
         meteor build ../output

WARNING: npm peer requirements (for juliancwirko:postcss) not installed:
 - postcss@8.2.6 installed, postcss@^7.0.0 needed
 - postcss-load-config@3.0.1 installed, postcss-load-config@^2.1.0 needed

Read more about installing npm peer dependencies:
  http://guide.meteor.com/using-packages.html#peer-npm-dependencies

   Minifying app stylesheet                  /
  Replace Autoprefixer browsers option to Browserslist config.
  Use browserslist key in package.json or .browserslistrc file.

  Using browsers option can cause errors. Browserslist config can
  be used for Babel, Autoprefixer, postcss-normalize and other tools.

  If you really need to use option, rename it to overrideBrowserslist.
                                                                                                                                                                                                              Learn more at:
  https://github.com/browserslist/browserslist#readme
  https://twitter.com/browserslist


Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db
Why you should do it regularly:
https://github.com/browserslist/browserslist#browsers-data-updating
Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db
   Minifying app code                        \

这是第二个不成功的 运行。请注意，我在 运行s:

之间没有做任何事情 
 ❯❯❯ meteor build build --directory --server-only
WARNING: The output directory is under your source tree.
         Your generated files may get interpreted as source code!
         Consider building into a different directory instead
         meteor build ../output

WARNING: npm peer requirements (for juliancwirko:postcss) not installed:
 - postcss@8.2.6 installed, postcss@^7.0.0 needed
 - postcss-load-config@3.0.1 installed, postcss-load-config@^2.1.0 needed

Read more about installing npm peer dependencies:
  http://guide.meteor.com/using-packages.html#peer-npm-dependencies

/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/meteor-promise/promise_server.js:
218
      throw error;
      ^

SyntaxError: Unexpected token u in JSON at position 1
    at JSON.parse (<anonymous>)
    at /home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/tools/fs/tools/fs/optimistic.ts:321:17
    at wrap.makeCacheKey (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/tools/fs/tools/fs/optimistic.ts:36:
15)
    at recomputeNewValue (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/optimis
m/src/entry.ts:182:31)
    at Slot.withValue (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/@wry/conte
xt/lib/context.js:73:29)
    at reallyRecompute (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/optimism/
src/entry.ts:165:19)
    at Entry.recompute (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/optimism/
src/entry.ts:85:9)
    at optimistic (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/optimism/src/i
ndex.ts:101:25)
    at /home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/tools/fs/tools/fs/optimistic.ts:366:19
    at recomputeNewValue (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/optimis
m/src/entry.ts:182:31)
    at Slot.withValue (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/@wry/conte
xt/lib/context.js:73:29)
    at reallyRecompute (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/optimism/
src/entry.ts:165:19)
    at Entry.recompute (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/optimism/
src/entry.ts:85:9)
    at optimistic (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/optimism/src/i
ndex.ts:101:25)
    at find (/tools/isobuild/package-source.js:1339:30)
    at /tools/isobuild/package-source.js:1395:27
    at Array.forEach (<anonymous>)
    at find (/tools/isobuild/package-source.js:1374:22)
    at find (/tools/isobuild/package-source.js:1406:25)
    at /tools/isobuild/package-source.js:1395:27
    at Array.forEach (<anonymous>)
    at find (/tools/isobuild/package-source.js:1374:22)
    at /tools/isobuild/package-source.js:1395:27
    at Array.forEach (<anonymous>)
    at find (/tools/isobuild/package-source.js:1374:22)
    at /tools/isobuild/package-source.js:1395:27
    at Array.forEach (<anonymous>)
    at find (/tools/isobuild/package-source.js:1374:22)
    at /tools/isobuild/package-source.js:1395:27
    at Array.forEach (<anonymous>)
    at find (/tools/isobuild/package-source.js:1374:22)
    at /tools/isobuild/package-source.js:1395:27
    at Array.forEach (<anonymous>)
    at find (/tools/isobuild/package-source.js:1374:22)
    at /tools/isobuild/package-source.js:1418:34
    at Object.withCache (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/tools/fs/tools/fs/files.ts:1663:18)
    at PackageSource._findSources (/tools/isobuild/package-source.js:1418:18)
    at SourceArch.getFiles (/tools/isobuild/package-source.js:960:32)
    at /tools/isobuild/compiler.js:406:23
    at /tools/isobuild/compiler.js:186:28
    at Object.withCache (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/tools/fs/tools/fs/files.ts:1663:18)
    at /tools/isobuild/compiler.js:185:11
    at Function._.each._.forEach (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules
/underscore/underscore.js:186:9)
    at Object.compile (/tools/isobuild/compiler.js:180:5)
    at /tools/isobuild/bundler.js:3268:24
    at Object.capture (/tools/utils/buildmessage.js:283:5)
    at bundle (/tools/isobuild/bundler.js:3214:31)
    at /tools/isobuild/bundler.js:3157:32
    at Slot.withValue (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/@wry/conte
xt/lib/context.js:73:29)
    at Object.withCache (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/tools/fs/tools/fs/files.ts:1663:39)
    at Object.bundle (/tools/isobuild/bundler.js:3157:16)
    at buildCommand (/tools/cli/commands.js:1082:30)
    at /tools/cli/commands.js:945:25
    at Function.run (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/tools/tool-env/tools/tool-env/profile.ts
:289:14)
    at /tools/cli/commands.js:943:18
    at /home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/meteor-promise/fiber_pool.
js:43:40
 => awaited here:
    at Promise.await (/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/meteor-prom
ise/promise_server.js:60:12)
    at /tools/cli/main.js:1529:7

我也尝试过使用不同的目录输出执行第二个 运行，但得到相同的结果：

 ❯❯❯ meteor build .. --directory --server-only
WARNING: npm peer requirements (for juliancwirko:postcss) not installed:
 - postcss@8.2.6 installed, postcss@^7.0.0 needed
 - postcss-load-config@3.0.1 installed, postcss-load-config@^2.1.0 needed

Read more about installing npm peer dependencies:                                                                                                                                                             http://guide.meteor.com/using-packages.html#peer-npm-dependencies

/home/paymahn1/.meteor/packages/meteor-tool/.2.1.0.udr5f0.57lxg++os.linux.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.linux.x86_64/dev_bundle/lib/node_modules/meteor-promise/promise_server.js:
218
      throw error;
      ^
SyntaxError: Unexpected token u in JSON at position 1
    at JSON.parse (<anonymous>)

为什么连续两次尝试构建 meteor 都构建失败？

发生的情况是您生成了构建的应用程序但未将其捆绑（使用 --directory flag）。

因此你的文件结构中有额外的 JS 文件。

并且在您的尝试中，它们与您的 Meteor 项目结构混合，在 build 文件夹中（当您使用命令 meteor build build --directory 时）或直接合并（meteor build .. --directory）。

因此，在下一个构建 运行 中，Meteor 会选择这些额外的 JS 文件，就好像它们是您的源代码的一部分一样（预先加载），但失败了，如警告消息中所建议的：

The output directory is under your source tree. Your generated files may get interpreted as source code! Consider building into a different directory instead meteor build ../output

如果您指定了一个显式的同级构建文件夹，而不仅仅是父文件夹（因此将文件直接放在您的 Meteor 项目根目录中），它将在您的下一次尝试中起作用，例如meteor build ../siblingFolder

另一种可能的解决方法是使用以点 . 开头的构建文件夹名称，这样 Meteor 在接下来的 运行 中查找源代码时会忽略它，例如meteor build ./.build

请参阅 special directories 文档：

The following directories are also not loaded as part of your app code:

  • Files/directories whose names start with a dot, like .meteor and .git