The commit-specific matching might be more work, as it would require fetching all the commits that are contained in the PR, but the PR title and body should be already available.

What about adding a label config object item like pr: { body?: StringOrMatchConfig[], title?: StringOrMatchConfig[] }?

Ex:

# Add 'test' label to any change to *.spec.js files within the source dir
# or with a PR title that is in the form 'test:*'
# or with a PR body that contains the word 'test' but not 'bug'
test:
 - src/**/*.spec.js
 - pr:
     title:
       - 'test:*'
     body:
       - any: [ '*test*' ]
         all: [ '*bug*' ]

This could then be expanded to include the commits:

# Add 'test' label to any change to *.spec.js files within the source dir
# or with a PR title that is in the form 'test:*'
# or with a PR body that contains the word 'test' but not 'bug'
# or has any commits with a title in the form 'test:*'
test:
 - src/**/*.spec.js
 - pr:
     title:
       - 'test:*'
     body:
       - any: [ '*test*' ]
         all: [ '*bug*' ]
- commits:
    title:
      - 'test:*'

In typescript, this could then be modeled like:

export interface MatchConfig {
  all?: string[];
  any?: string[];
}

export type MatchConfigEntry = string | MatchConfig;

export interface PRConfigEntry {
  title?: MatchConfigEntry[];
  body?: MatchConfigEntry[];
}

export type ConfigEntry = MatchConfigEntry | { pr: PRConfigEntry };

export interface Config {
  [label: string]: ConfigEntry[];
}

const config: Config = {
  // ...
  test: [
    'src/**/*.spec.js',
    {
      pr: {
        title: ['test:*'],
        body: [
          {
            any: ['*test*'],
            all: ['*bug*']
          }
        ]
      }
    }
  ]
  // ...
}

Support labeling based on the pull request/commit title and messages #55

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