Changes

• Core:

  1. Print deprecation warnings for the included 404 and 500 handlers.

     Implementation, Issue, Pull Request

Breaking Changes

• Dependency: meddleware (v1 -> v3)

  1. Call registered middleware factories with a context set to the method owner. This helps in specific cases (e.g., Passport).
     Previously: The factory was called with a context of null.

     Implementation, Issue, Pull Request

  2. Default middleware enabled to true. I.e., omitting the enabled option will still enable the middleware.
     Previously: middleware was defaulted enabled to false.

     Implementation, Issue, Pull Request

  3. Remove the ability to toggle the enabled state of a middleware at arbitrary points during runtime. Now, a middleware that is not enabled—by explicitly setting enabled to false, given breaking change No.1—will not be required (i.e., not parsed), and cannot be enabled at a later time.
     Previously: middleware could be toggled. Was by design, but largely unused and caused unanticipated behavior.

     Issue, Pull Request

• Dependency: confit (v1 -> v2)

  1. Resolve the import shortstop handler after merging config.json, [env].json, and before the other shortstop handlers are resolved.
     Previously: import handler resolved only once, before the rest of the shortstop handlers.

     implementation 1, implementation 2, Issue, Pull Request

     New Behavior:

     { "main": "import:main.json" }                              // config/config.json
     { "key": "value", "otherKey": "otherValue" }                // config/main.json
     { "main": { "key": "devValue" } }                           // config/dev.json
     { "main": { "key": "devValue", "otherKey": "otherValue" } } // result
     

  2. Change source priority—from highest to lowest (higher overrides lower)— to: command line arguments, environment variables, [env].json, config.json, convenience (environment normalization and env:* keys).
     Previously: source priority order, from highest to lowest, was [env].json, config.json, convenience, environment variables, command line arguments.

     Implementation, Pull Request

     New Behavior

     // config/config.json
     { "KEY": "fromConfig", "OTHER_KEY": "fromConfig", "THIRD_KEY": "fromConfig" }
     

     OTHER_KEY=fromEnv THIRD_KEY=fromEnv node myApp.js --THIRD_KEY=fromArgv
     

     // result
     { "KEY": "fromConfig", "OTHER_KEY": "fromEnv", "THIRD_KEY": "fromArgv" }