babel-core/lib/babel/messages.js

Turn ES6 code into readable vanilla ES5 with source maps

var util = require("util");

exports.messages = {
  tailCallReassignmentDeopt: "Function reference has been reassigned so it's probably be dereferenced so we can't optimise this with confidence",
  JSXNamespacedTags: "Namespace tags are not supported. ReactJSX is not XML.",
  classesIllegalBareSuper: "Illegal use of bare super",
  classesIllegalSuperCall: "Direct super call is illegal in non-constructor, use super.$1() instead",
  classesIllegalConstructorKind: "Illegal kind for constructor method",
  scopeDuplicateDeclaration: "Duplicate declaration $1",
  undeclaredVariable: "Reference to undeclared variable $1",
  undeclaredVariableSuggestion: "Reference to undeclared variable $1 - did you mean $2?",
  settersInvalidParamLength: "Setters must have exactly one parameter",
  noAssignmentsInForHead: "No assignments allowed in for-in/of head",
  expectedMemberExpressionOrIdentifier: "Expected type MemeberExpression or Identifier",
  invalidParentForThisNode: "We don't know how to handle this node within the current parent - please open an issue",
  readOnly: "$1 is read-only",
  modulesIllegalExportName: "Illegal export $1",
  unknownForHead: "Unknown node type $1 in ForStatement",
  didYouMean: "Did you mean $1?",
  evalInStrictMode: "eval is not allowed in strict mode"
};

exports.get = function (key) {
  var msg = exports.messages[key];
  if (!msg) throw new ReferenceError("Unknown message `" + key + "`");

  var args = [];
  for (var i = 1; i < arguments.length; i++) {
    args.push(arguments[i]);
  }
  args = exports.parseArgs(args);

  return msg.replace(/\$(\d+)/g, function (str, i) {
    return args[--i];
  });
};

exports.parseArgs = function (args) {
  return args.map(function (val) {
    if (val != null && val.inspect) {
      return val.inspect();
    } else {
      try {
        return JSON.stringify(val) || val + "";
      } catch (e) {
        return util.inspect(val);
      }
    }
  });
};