Freeze UTFSequence
Summary: Don't want anyone accidentally mutating it. Also make deepFreezeAndThrowOnMutationInDev easier to use with nice flow typing. Reviewed By: yungsters Differential Revision: D6974089 fbshipit-source-id: 0f90e7939cb726893fa353a4f2a6bbba701205bc
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@ -13,6 +13,8 @@
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'use strict';
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const deepFreezeAndThrowOnMutationInDev = require('deepFreezeAndThrowOnMutationInDev');
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/**
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* A collection of Unicode sequences for various characters and emoji.
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*
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@ -20,7 +22,7 @@
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* - Source code should be limitted to ASCII.
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* - Less chance of typos.
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*/
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const UTFSequence = {
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const UTFSequence = deepFreezeAndThrowOnMutationInDev({
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MIDDOT: '\u00B7', // normal middle dot: ·
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MIDDOT_SP: '\u00A0\u00B7\u00A0', // ·
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MIDDOT_KATAKANA: '\u30FB', // katakana middle dot
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@ -30,6 +32,6 @@ const UTFSequence = {
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NDASH_SP: '\u00A0\u2013\u00A0', // –
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NBSP: '\u00A0', // non-breaking space:
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PIZZA: '\uD83C\uDF55',
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};
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});
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module.exports = UTFSequence;
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@ -29,13 +29,13 @@
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* Freezing the object and adding the throw mechanism is expensive and will
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* only be used in DEV.
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*/
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function deepFreezeAndThrowOnMutationInDev(object: Object) {
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function deepFreezeAndThrowOnMutationInDev<T: Object>(object: T): T {
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if (__DEV__) {
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if (typeof object !== 'object' ||
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object === null ||
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Object.isFrozen(object) ||
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Object.isSealed(object)) {
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return;
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return object;
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}
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var keys = Object.keys(object);
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@ -58,6 +58,7 @@ function deepFreezeAndThrowOnMutationInDev(object: Object) {
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}
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}
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}
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return object;
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}
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function throwOnImmutableMutation(key, value) {
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