ce-decorators/lib/reflect.js

Custom Element decorators for typescript

/**
 * Copyright (c) 2018 Mathis Zeiher
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
const origReflect = window.Reflect || {}; // tslint:disable-line:no-any

// tslint:disable-line:no-any
const reflectMap = new Map();

function getOrCreateMetadataMap(map, property) {
  let metadataMap = map.get(property);

  if (!metadataMap) {
    metadataMap = new Map();
    map.set(property, metadataMap);
  }

  return metadataMap;
}

function getOrCreatePropMap(map, target) {
  let propMap = map.get(target);

  if (!propMap) {
    propMap = new Map();
    map.set(target, propMap);
  }

  return propMap;
}

function decorate(decorators, target, propertyKey, description) {
  // tslint:disable-line:no-any
  if (typeof origReflect === 'object' && typeof origReflect.decorate === 'function' && origReflect.decorate !== decorate) {
    // tslint:disable-line:no-unsafe-any
    origReflect.decorate(decorators, target, propertyKey, description); // tslint:disable-line:no-unsafe-any
  }

  const desciptor = decorators.reverse() // tslint:disable-line:no-any
  .reduce((prevValue, currentValue) => currentValue(target, propertyKey, prevValue) || prevValue, description); // tslint:disable-line

  return desciptor || description;
}

function metadata(metadataKey, metaDataValue) {
  // tslint:disable-line:no-any
  if (typeof origReflect === 'object' && typeof origReflect.metadata === 'function' && origReflect.metadata !== metadata) {
    // tslint:disable-line:no-unsafe-any
    return origReflect.metadata(metadataKey, metaDataValue); // tslint:disable-line:no-unsafe-any
  } else {
    return (target, property) => {
      if (!property) {
        property = '';
      }

      const propMap = getOrCreatePropMap(reflectMap, target);
      getOrCreateMetadataMap(propMap, property).set(metadataKey, metaDataValue);
    };
  }
}

function getMetadata(metadataKey, target, propertyKey) {
  // tslint:disable-line:no-any
  if (typeof origReflect === 'object' && typeof origReflect.getMetadata === 'function' && origReflect.getMetadata !== getMetadata) {
    // tslint:disable-line:no-unsafe-any
    return origReflect.getMetadata(metadataKey, target, propertyKey); // tslint:disable-line:no-unsafe-any
  } else {
    return getOrCreateMetadataMap(getOrCreatePropMap(reflectMap, target), propertyKey).get(metadataKey);
  }
}

if (!window.Reflect) {
  // tslint:disable-line:no-any
  window.Reflect = {
    decorate,
    getMetadata,
    metadata
  }; // tslint:disable-line:no-any

  window.ReflectPoorlyFill = {
    decorate,
    getMetadata,
    metadata
  }; // tslint:disable-line:no-any
} else {
  if (!window.Reflect.decorate) {
    // tslint:disable-line
    window.Reflect.decorate = decorate; // tslint:disable-line
  }

  if (!window.Reflect.getMetadata) {
    // tslint:disable-line
    window.Reflect.getMetadata = getMetadata; // tslint:disable-line
  }

  if (!window.Reflect.metadata) {
    // tslint:disable-line
    window.Reflect.metadata = metadata; // tslint:disable-line
  }

  window.ReflectPoorlyFill = {
    decorate,
    getMetadata,
    metadata
  }; // tslint:disable-line
}
//# sourceMappingURL=reflect.js.map