INNER CODE UNIT · JavaScript

isSimpleParameterList

standard-things/esm · .babel.config.js:66

  function isSimpleParameterList(params) {
    return params.every(({ type }) => type === "Identifier")
  }

  function enterFunction(path) {
    const { node } = path
    const { directives } = node.body

    if (directives &&
        isSimpleParameterList(node.params) &&
        ! isInMode(path)) {
      directives.push(types.directive(types.directiveLiteral("use strict")))
    }
  }

  return {
    visitor: {
      ArrowFunctionExpression: enterFunction,

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