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If you're running into issues with Component, the first step you should do is run component validate. This will validate your component.json files and tell you if there are any major issues with your component.json.

The next step is to use the DEBUG environmental variable. Read more about how DEBUG works. For a quick debug statement, run your command prefixed with DEBUG=component*. For example, this debugs a component update command:

$ DEBUG=component* component update
  component-resolver remote not set - defaulting to ["github"] +0ms
  component-resolver:locals resolving local at "/Users/jong/Workspace/test" +0ms
  component-resolver resolving "asdf" +11ms
  component-resolver:locals resolving "asdf"'s local dependency "test". +5ms
  component-resolver:locals looking up "asdf"'s local dependency "test" at "/Users/jong/Workspace/test/lib/test". +0ms
  component-resolver remaining dependencies: 0 +1ms
  component-resolver remaining semver: 0 +0ms
  component-resolver:locals resolving local at "/Users/jong/Workspace/test/lib/test" +1ms
  component-resolver resolving "test" +2ms
  component-resolver remaining dependencies: 0 +0ms
  component-resolver remaining semver: 0 +0ms
  component-resolver:locals resolved local "asdf" +1ms
  component-resolver finished resolving locals +1ms
  component-resolver finished resolving dependencies (1) +0ms
  component-resolver finished installing dependencies +0ms
      update : updating asdf's pinned dependencies
      update : updated asdf's ranged dependencies in 743ms

You may also be interested in DEBUG=remotes* for when dependencies don't install, specifically those error : Error: no remote found for dependency "es-shims/es5-shim@v2.3.0". messages. Some common causes for this error are:

  • The repository does not exist.
  • The repository was deleted or has moved to a different location.
  • The version specified does not have a component.json, but master does. In this case, specify master as the version ask the maintainer to create a new release with a component.json.

Here's an example on debugging:

$ DEBUG=remotes* component install es-shims/es5-shim@v2.3.0
  remotes:local checking local components at /Users/jong/Workspace/test/components +0ms
  remotes:local resolving local remote +11ms
  remotes:local checking folder: /Users/jong/Workspace/test/components/es-shims/es5-shim +1ms
  remotes:github GET "https://raw.githubusercontent.com/es-shims/es5-shim/v2.3.0/component.json" +0ms
  remotes:github GET "https://raw.github.com/es-shims/es5-shim/v2.3.0/component.json" +352ms
  remotes:github GET "https://raw.githubusercontent.com/es-shims/es5-shim/v2.3.0/component.json" +284ms
  remotes:github GET "https://raw.github.com/es-shims/es5-shim/v2.3.0/component.json" +124ms

       error : Error: no remote found for dependency "es-shims/es5-shim@v2.3.0".

This shows you which URLs were tried, and since no remote was found, all of these URLs 404'd.

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