Acme.BookStore.HttpApi.Host/node_modules/value-or-function/index.js

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'use strict';

// Built-in types
var types = [
  'object',
  'number',
  'string',
  'symbol',
  'boolean',
  'date',
  'function', // Weird to expose this
];


function normalize(coercer, value) {
  if (typeof value === 'function') {
    if (coercer === 'function') {
      return value;
    }
    value = value.apply(this, slice(arguments, 2));
  }
  return coerce(this, coercer, value);
}


function coerce(ctx, coercer, value) {

  // Handle built-in types
  if (typeof coercer === 'string') {
    if (coerce[coercer]) {
      return coerce[coercer].call(ctx, value);
    }
    return typeOf(coercer, value);
  }

  // Handle custom coercer
  if (typeof coercer === 'function') {
    return coercer.call(ctx, value);
  }

  // Array of coercers, try in order until one returns a non-null value
  var result;
  coercer.some(function(coercer) {
    result = coerce(ctx, coercer, value);
    return result != null;
  });

  return result;
}


coerce.string = function(value) {
  if (value != null &&
    typeof value === 'object' &&
    typeof value.toString === 'function') {

    value = value.toString();
  }
  return typeOf('string', primitive(value));
};