documentation/lib/infer/return.js
Tom MacWright 631c6925d4 feat(core): Switch to Promises everywhere. Adopt Node v4 ES6 (#648)
* feat(core): Switch to Promises everywhere. Adopt Node v4 ES6

Big changes:

* Uses template strings where appropriate
* Config and argument parsing is unified and there is no such thing
  as formatterOptions anymore. All user-passed options go through
  mergeConfig.
* The node API surface changed (again): `buildSync` is removed,
  building operations return Promises.
* Now using Flow for internal type annotations.

More changes:

* Remove buildSync command
* feat(inference): Partially implement object shorthand support
* Refs #649
* Use Flow annotations to  enforce types
* Keep flow but switch to comment syntax
* Clarify types
* More flow improvements
* Turn server into class
* LinkerStack becomes class too
* Fix comment description type
* Run flow on lint
* Many more flow fixes
* More intense flow refactoring
* Simplify inference steps
* Update inference tests, flow errors down to 1
* Continue refining types
* Fix more flow issues
* Use 'use strict' everywhere
* Make 'ast' property configurable
* Fix many tests
* Fix more tests
* Fix more tests
* Fix augments
* Test Markdown meta support
* Improve test coverage
* Switch back from for of to for for speed
2017-01-27 16:14:19 -05:00

48 lines
1.1 KiB
JavaScript

'use strict';
/* @flow */
var findTarget = require('./finders').findTarget,
t = require('babel-types'),
flowDoctrine = require('../flow_doctrine');
/**
* Infers returns tags by using Flow return type annotations
*
* @name inferReturn
* @param {Object} comment parsed comment
* @returns {Object} comment with return tag inferred
*/
function inferReturn(comment/*: Comment */) {
if (Array.isArray(comment.returns) &&
comment.returns.length &&
comment.returns[0].type) {
return comment;
}
var path = findTarget(comment.context.ast);
var fn = path && path.node;
// In case of `/** */ var x = function () {}` findTarget returns
// the declarator.
if (t.isVariableDeclarator(fn)) {
fn = fn.init;
}
if (t.isFunction(fn) &&
fn.returnType &&
fn.returnType.typeAnnotation) {
var returnType = flowDoctrine(fn.returnType.typeAnnotation);
if (comment.returns && comment.returns.length > 0) {
comment.returns[0].type = returnType;
} else {
comment.returns = [{
title: 'returns',
type: returnType
}];
}
}
return comment;
}
module.exports = inferReturn;