function checkIdxArguments()

in packages/babel-plugin-idx/src/babel-plugin-idx.js [17:52]

• 36 lines of code
• 7 McCabe index (conditional complexity)

  function checkIdxArguments(file, node) {
    const args = node.arguments;
    if (args.length !== 2) {
      throw file.buildCodeFrameError(
        node,
        'The `idx` function takes exactly two arguments.',
      );
    }
    const arrowFunction = args[1];
    if (!t.isArrowFunctionExpression(arrowFunction)) {
      throw file.buildCodeFrameError(
        arrowFunction,
        'The second argument supplied to `idx` must be an arrow function.',
      );
    }
    if (!t.isExpression(arrowFunction.body)) {
      throw file.buildCodeFrameError(
        arrowFunction.body,
        'The body of the arrow function supplied to `idx` must be a single ' +
          'expression (without curly braces).',
      );
    }
    if (arrowFunction.params.length !== 1) {
      throw file.buildCodeFrameError(
        arrowFunction.params[2] || arrowFunction,
        'The arrow function supplied to `idx` must take exactly one parameter.',
      );
    }
    const input = arrowFunction.params[0];
    if (!t.isIdentifier(input)) {
      throw file.buildCodeFrameError(
        arrowFunction.params[0],
        'The parameter supplied to `idx` must be an identifier.',
      );
    }
  }