Flow needs to know which files to read and watch for changes. This set of files is determined by taking all included files and excluding all the ignored files.
[ignore] section in a
.flowconfig file tells Flow to ignore files matching the specified regular expressions when type checking your code. By default, nothing is ignored.
Things to keep in mind:
[ignore] section might look like:
[ignore] .*/__tests__/.* .*/src/\(foo\|bar\)/.* .*\.ignore\.js
[ignore] section will ignore:
Starting with Flow v0.23.0, you may use the
<PROJECT_ROOT> placeholder in your regular expressions. At runtime, Flow will treat the placeholder as if it were the absolute path to the project’s root directory. This is useful for writing regular expressions that are relative rather than absolute.
For example, you can write:
Which would ignore any file or directory under the directory named
__tests__/ within the project root. However, unlike the previous example’s
.*/__tests__/.*, it would NOT ignore files or directories under other directories named
Sometimes you may want to ignore all files inside a directory with the exception of a few. An optional prefix “!” which negates the pattern may help. With this, any matching file excluded by a previous pattern will become included again.
[ignore] <PROJECT_ROOT>/node_modules/.* !<PROJECT_ROOT>/node_modules/not-ignored-package-A/.* !<PROJECT_ROOT>/node_modules/not-ignored-package-B/.*
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