Check your files for the presence of the `@flow` and `@flow weak` annotations
npm install flow-annotation-check
!node  
Verify the @flow, @flow strict, @flow strict-local and @flow weak annotations in your javascript files.
Install with Yarn or NPM to include in your project:
``bash`
yarn add --dev flow-annotation-checkor
npm install --save-dev flow-annotation-check
or use npx to easily run the cli commands:
`bash`
npx flow-annotation-check ~/path/to/project
Once installed you can import flow-annotation-check into your own module and have the checker return a list of files for you to further process.
`javascript`
import {genSummarizedReport, genCheckFlowStatus, genValidate} from 'flow-annotation-check';
The most useful public methods are:
- genSummarizedReport(folder: string, config: Config): Promise
-
The types involved are:
`javascript
type Glob = string; // See https://github.com/isaacs/node-glob
type Config = {
include: Array
exclude: Array
absolute: boolean,
};
type FlowStatus = 'flow' | 'flow strict' | 'flow strict-local' | 'flow weak' | 'no flow';
type Report = {
summary: {
flow: number,
flowstrict: number,
flowstrictlocal: number,
flowweak: number,
noflow: number,
total: number,
},
files: Array<{
file: string,
status: FlowStatus,
}>,
};
`
#### genSummarizedReport(folder, config)
If you want to check a whole project at once, then call genSummarizedReport. You can pass in the root folder, like ~/my-project/src and then a configuration object with some glob strings to find your files. genSummarizedReport will return a Promise that will resolve when all matching files have had their flow-status discovered.
This is a convenience method to make working with globs and mapping over genCheckFlowStatus easier. Each file is tested serially in order to avoid setting really long timeouts that lock up the flow server.
`javascript
import {genSummarizedReport} from 'flow-annotation-check';
genSummarizedReport(
'~/path/to/project',
{
include: ['*/.js'],
exclude: ['*/.coffee'],
absolute: true,
}
).then((report) => {
report.files.forEach((entry) => {
console.log(entry.status + "\t" + entry.file);
});
});
`
#### genCheckFlowStatus(flowPath, filePath)
If you're checking one file at a time then go ahead and call genCheckFlowStatus directly. This takes a string that will be passed directly into the flow binary you specify. If flow is installed in your project, or on your system path then pass 'flow' as the first argument.
`javascript
import {genCheckFlowStatus} from 'flow-annotation-check';
const file = '~/path/to/project/src/main.js';
genCheckFlowStatus('flow', file).then((status) => {
console.log(The status of ${file} is ${status});`
});
You can use npx to run flow-annotation-check against your codebase in the terminal. It's as simple as:
`bash`
$ npx flow-annotation-check ~/path/to/project
With the default flags typed out it looks like:
`bash`
$ npx flow-annotation-check \
--level=flow \
--flow-path flow \
--output text \
--list-files all \
--include "*/.js" \
--exclude "+(node_modules|build|flow-typed)/*/.js" \
.
Or, save your configuration inside package.json file under the flow-annotation-check field. The defaults look like this:
`json`
{
"devDependencies": {
"flow-annotation-check": "^1.0.0"
},
"flow-annotation-check": {
"absolute": false,
"level": "flow",
"flow_path": "flow",
"output": "text",
"list_files": "all",
"include": [ "*/.js" ],
"exclude": [ "+(node_modules|build|flow-typed)/*/.js" ],
"root": "."
}
}
CLI flags, if included, will override package.json settings. Anything not specified as a CLI flag or inside package.json will use the default value.
The common settings to use are:
* -i, --include Glob for files to include. Can be set multiple times.-x
* , --exclude Glob for files to exclude. Can be set multiple times.-a
* , --absolute Report absolute path names. The default is to report only filenames.-o
* , --output Choose from either text, csv, junit, json or html format.--show-summary
* Include a summary of the data in the --output stream. Summary is never included in the junit format, and always in the json format.
Setting --exclude will override the defaults! Don't forget to ignore node_modules/*/.js in addition to project specific folders.
Using multiple globs for --include and --exclude can help keep your configuration easy to understand and modify. The default setting of --exclude "+(node_modules|build|flow-typed)/*/.js" is equivalent to:
`
$ npx flow-annotation-check \
-x node_modules/*/.js \
-x build/*/.js \
-x flow-typed/*/.js \
.
The full list of available commands and flags can be found by running npx flow-annotation-check -h.
You can use the --output flag, or -o to set the output format of the report. All reports are printed to stdio using console.log. The --output flag has no affect when --validate is set.
The default format is text which prints a two column list of status value (one of flow, flow weak or no flow) and filename separated by the Tab character.
The csv option prints a two column list of status value and filename with each field wrapped in quotes and separated by ,.
The junit option prints an xml report suitable to be consumed by CI tools like Jenkins.
The json option prints a json file with the return value of genSummarizedReport(), the Report type described above.
The html-table option prints an opening and closing