reprism/src/languages/flow.js

Modular Syntax highlighting for the web

export default {
  language: 'flow',
  init: Prism => {
    (function (Prism) {
      Prism.languages.flow = Prism.languages.extend('javascript', {})

      Prism.languages.insertBefore('flow', 'keyword', {
        type: [
          {
            pattern: /\b(?:[Nn]umber|[Ss]tring|[Bb]oolean|Function|any|mixed|null|void)\b/,
            alias: 'tag',
          },
        ],
      })
      Prism.languages.flow[
        'function-variable'
      ].pattern = /[_$a-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*=\s*(?:function\b|(?:\([^()]*\)(?:\s*:\s*\w+)?|[_$a-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*)\s*=>))/i

      Prism.languages.insertBefore('flow', 'operator', {
        'flow-punctuation': {
          pattern: /\{\||\|\}/,
          alias: 'punctuation',
        },
      })

      if (Prism.util.type(Prism.languages.flow.keyword) !== 'Array') {
        Prism.languages.flow.keyword = [Prism.languages.flow.keyword]
      }
      Prism.languages.flow.keyword.unshift(
        {
          pattern: /(^|[^$]\b)(?:type|opaque|declare|Class)\b(?!\$)/,
          lookbehind: true,
        },
        {
          pattern: /(^|[^$]\B)\$(?:await|Diff|Exact|Keys|ObjMap|PropertyType|Shape|Record|Supertype|Subtype|Enum)\b(?!\$)/,
          lookbehind: true,
        }
      )
    }(Prism))
  },
}