Fastify 中文文档 (master)
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Warnings
Warnings In Fastify
Fastify utilizes Node.js's warning event API to notify users of deprecated features and known coding mistakes. Fastify's warnings are recognizable by the FSTWRN and FSTDEP prefixes on warning code. When encountering such a warning, it is highly recommended that the cause of the warning be determined through use of the --trace-warnings and --trace-deprecation flags. These will produce stack traces pointing out where the issue occurs in the application's code. Issues opened about warnings without including this information may be closed due to lack of information.
In addition to tracing, warnings can also be disabled. It is not recommended to disable warnings as a matter of course, but if necessary, they can be disabled by using any of the following methods:
- setting the
NODE_NO_WARNINGSenvironment variable to1 - passing the
--no-warningsflag to the node process - setting 'no-warnings' in the
NODE_OPTIONSenvironment variable
For more information on how to disable warnings, see node's documentation.
However, disabling warnings is not recommended as it may cause potential problems when upgrading Fastify versions. Only experienced users should consider disabling warnings.
Fastify Warning Codes
| Code | Description | How to solve | Discussion |
|---|---|---|---|
| FSTWRN001 | The specified schema for a route is missing. This may indicate the schema is not well specified. | Check the schema for the route. | #4647 |
| FSTWRN002 | The %s plugin being registered mixes async and callback styles, which will result in an error in fastify@5. | Do not mix async and callback style. | #5139 |
Fastify Deprecation Codes
Deprecation codes are further supported by the Node.js CLI options:
| Code | Description | How to solve | Discussion |
|---|---|---|---|
| FSTDEP005 | You are accessing the deprecated request.connection property. | Use request.socket. | #2594 |
| FSTDEP007 | You are trying to set a HEAD route using exposeHeadRoute route flag when a sibling route is already set. | Remove exposeHeadRoutes or explicitly set exposeHeadRoutes to false | #2700 |
| FSTDEP008 | You are using route constraints via the route {version: "..."} option. | Use {constraints: {version: "..."}} option. | #2682 |
| FSTDEP009 | You are using a custom route versioning strategy via the server {versioning: "..."} option. | Use {constraints: {version: "..."}} option. | #2682 |
| FSTDEP010 | Modifying the reply.sent property is deprecated. | Use the reply.hijack() method. | #3140 |
| FSTDEP012 | You are trying to access the deprecated request.context property. | Use request.routeOptions.config or request.routeOptions.schema. | #4216 #5084 |
| FSTDEP013 | Direct return of "trailers" function is deprecated. | Use "callback" or "async-await" for return value. | #4380 |
| FSTDEP015 | You are accessing the deprecated request.routeSchema property. | Use request.routeOptions.schema. | #4470 |
| FSTDEP016 | You are accessing the deprecated request.routeConfig property. | Use request.routeOptions.config. | #4470 |
| FSTDEP017 | You are accessing the deprecated request.routerPath property. | Use request.routeOptions.url. | #4470 |
| FSTDEP018 | You are accessing the deprecated request.routerMethod property. | Use request.routeOptions.method. | #4470 |
| FSTDEP019 | You are accessing the deprecated reply.context property. | Use reply.routeOptions.config or reply.routeOptions.schema. | #5032 #5084 |
| FSTDEP021 | The reply.redirect() method has a new signature: reply.redirect(url: string, code?: number). It will be enforced in fastify@v5'. | #5483 |