whole_func_string: function api(scope) {
  		if (!scope) {
  			throw new TypeError('api, scope is required');
  		}
  
  		// TODO filter.
  
  		inject(tool, scope, true);
  		inject(thing, scope, false);
  		scope.noop = noop;
  		scope.now = now;
  
  		config.addon &&
  			config.addon.split(',')
  				.sort(
  					(a, b) => a.localeCompare(b)
  				)
  				.forEach((name) => {
  					const module = require(util.resolve(name));
  					scope[name] = module;
  
  					// NOTE support for assterion/expectation libraries.
  					if (module.assert) {
  						scope.assert = module.assert;
  					}
  					if (module.expect) {
  						scope.expect = module.expect;
  					}
  					// TODO support should();
  
  					// WORKAROUND for chai plugins.
  					/^chai-/.test(name) && scope.chai &&
  						scope.chai.use(module);
  				});
  
  		return scope;
  	}
func_code_string: function api(scope) {
  		if (!scope) {
  			throw new TypeError('api, scope is required');
  		}
  
  		// TODO filter.
  
  		inject(tool, scope, true);
  		inject(thing, scope, false);
  		scope.noop = noop;
  		scope.now = now;
  
  		config.addon &&
  			config.addon.split(',')
  				.sort(
  					(a, b) => a.localeCompare(b)
  				)
  				.forEach((name) => {
  					const module = require(util.resolve(name));
  					scope[name] = module;
  
  					// NOTE support for assterion/expectation libraries.
  					if (module.assert) {
  						scope.assert = module.assert;
  					}
  					if (module.expect) {
  						scope.expect = module.expect;
  					}
  					// TODO support should();
  
  					// WORKAROUND for chai plugins.
  					/^chai-/.test(name) && scope.chai &&
  						scope.chai.use(module);
  				});
  
  		return scope;
  	}
func_documentation_string: Injects Tasty API into given `scope`. Called automatically with `global` if {@link /tasty/?api=server#Tasty|`config.globals`} is `true`.
  @memberof tasty
  @method api
  @param {Object} scope Scope to inject API into.
  @returns {Object} Passed `scope` for chaining.
  @throws {TypeError}
  @example tasty.api(this);