function-tree/es/providers/Resolve.js

When a function is not enough

import Provider from '../Provider';
import { ResolveValue } from '../ResolveValue';
import { Tag } from '../Tag';
export default new Provider({
  isTag: function isTag(arg) {
    if (!(arg instanceof Tag)) {
      return false;
    }
    for (var _len = arguments.length, types = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      types[_key - 1] = arguments[_key];
    }
    if (types.length) {
      return types.reduce(function (isType, type) {
        return isType || type === arg.type;
      }, false);
    }
    return true;
  },
  isResolveValue: function isResolveValue(arg) {
    return arg instanceof ResolveValue;
  },
  value: function value(arg) {
    var overrides = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
    if (arg instanceof ResolveValue) {
      return arg.getValue(overrides ? Object.assign({}, this.context, overrides) : this.context);
    }
    return arg;
  },
  path: function path(arg) {
    if (arg instanceof Tag) {
      return arg.getPath(this.context);
    }
    throw new Error('You are extracting a path from an argument that is not a Tag.');
  }
}, {
  wrap: false
});
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