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Limit scopes per type with regexp and plain text.

npm i commitlint-plugin-selective-scope --save-dev

• If a type does not appear in the rule, do not enforce scope
• If a type appears in the rule with an empty array, do not allow scope
• If a type appears in the rule with an non-empty array, only allow the values in the array for scope.
• If the array includes null, the scope is optional.

module.exports = {
 plugins: ['selective-scope'],
 rules: {
 'selective-scope': [
 2,
 'always',
 {
 feat: [/^frontend\/[^\/]+$/, 'backend'],
 perf: [],
 ci: [null, 'codebuild', 'jenkins']
 }
 ]
 }
}

In the above rules configuration,

• if the type is feat, the scope must be either match the regex /frontend\/[^\/]+/ or be backend
• if the type if chore, the scope is optional and can be anything
• if the type is perf, a scope is not allowed
• if the type is ci, the scope must be codebuild or jenkins if present, but is not required