@babel/preset-flow/lib/index.js

Babel preset for all Flow plugins.

import { declarePreset } from '@babel/helper-plugin-utils';
import transformFlowStripTypes from '@babel/plugin-transform-flow-strip-types';
import { OptionValidator } from '@babel/helper-validator-option';

const v = new OptionValidator("@babel/preset-flow");
function normalizeOptions(options = {}) {
  let {
    all,
    ignoreExtensions,
    experimental_useHermesParser
  } = options;
  v.invariant(!("allowDeclareFields" in options), `Since Babel 8, \`declare property: A\` is always supported, and the "allowDeclareFields" option is no longer available. Please remove it from your config.`);
  const TopLevelOptions = {
    all: "all",
    ignoreExtensions: "ignoreExtensions",
    experimental_useHermesParser: "experimental_useHermesParser"
  };
  v.validateTopLevelOptions(options, TopLevelOptions);
  all = v.validateBooleanOption(TopLevelOptions.all, all);
  ignoreExtensions = v.validateBooleanOption(TopLevelOptions.ignoreExtensions, ignoreExtensions);
  experimental_useHermesParser = v.validateBooleanOption(TopLevelOptions.experimental_useHermesParser, experimental_useHermesParser);
  return {
    all,
    ignoreExtensions,
    experimental_useHermesParser
  };
}

const index = declarePreset((api, opts) => {
  api.assertVersion("^7.0.0-0 || ^8.0.0");
  const {
    all,
    ignoreExtensions = false,
    experimental_useHermesParser: useHermesParser = false
  } = normalizeOptions(opts);
  const plugins = [[transformFlowStripTypes, {
    all
  }]];
  if (useHermesParser) {
    plugins.unshift("babel-plugin-syntax-hermes-parser");
  }
  if (ignoreExtensions) {
    return {
      plugins
    };
  }
  return {
    overrides: [{
      test: filename => filename == null || !/\.tsx?$/.test(filename),
      plugins
    }]
  };
});

export { index as default };
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