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67 lines
2.2 KiB
67 lines
2.2 KiB
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @providesModule keyMirrorRecursive
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* @flow strict
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* @typechecks
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*/
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'use strict';
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var invariant = require("./invariant");
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export type KeyMirrorRecursive<O> = $ObjMapi<O, (<O: {...}>(mixed, O) => KeyMirrorRecursive<O>) & (<K>(K) => K)>;
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export type KeyMirrorRecursiveWithPrefix<O> = $ObjMapi<O, (<O: {...}>(mixed, O) => KeyMirrorRecursiveWithPrefix<O>) & ((mixed) => string)>;
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type keyMirrorRecursiveFn = (<O: {...}>(obj: O, _: void) => KeyMirrorRecursive<O>) & (<O: {...}>(obj: O, prefix: string) => KeyMirrorRecursiveWithPrefix<O>);
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/**
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* Constructs an enumeration with keys equal to their value. If the value is an
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* object, the method is run recursively, including the parent key as a suffix.
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* An optional prefix can be provided that will be prepended to each value, but
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* note that if a prefix is provided, the types the values of the object are
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* just strings, not string literals.
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*
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* For example:
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*
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* var ACTIONS = keyMirror({FOO: '', BAR: { BAZ: '', BOZ: '' }}});
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* ACTIONS.BAR.BAZ = 'BAR.BAZ';
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*
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* Input: {key1: '', key2: { nested1: '', nested2: '' }}}
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* Output: {key1: key1, key2: { nested1: nested1, nested2: nested2 }}}
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*
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* var CONSTANTS = keyMirror({FOO: {BAR: ''}}, 'NameSpace');
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* console.log(CONSTANTS.FOO.BAR); // NameSpace.FOO.BAR
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*/
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const keyMirrorRecursive: keyMirrorRecursiveFn = (obj: {...}, prefix) => {
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const ret: {
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[string]: KeyMirrorRecursiveWithPrefix<$FlowFixMe> | string
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} = {};
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invariant(isObject(obj), 'keyMirrorRecursive(...): Argument must be an object.');
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for (const key in obj) {
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if (!obj.hasOwnProperty(key)) {
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continue;
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}
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var val = obj[key];
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var newPrefix = prefix != null && Boolean(prefix) ? prefix + '.' + key : key;
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if (isObject(val)) {
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val = keyMirrorRecursive(val, newPrefix);
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} else {
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val = newPrefix;
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}
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ret[key] = val;
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}
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return ret;
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};
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function isObject<T: {...}>(obj: T): boolean {
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return obj instanceof Object && !Array.isArray(obj);
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}
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module.exports = keyMirrorRecursive; |