/** * Copyright (c) Facebook, Inc. and its affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * * @flow */ import {REACT_OPAQUE_ID_TYPE} from 'shared/ReactSymbols'; /* * The `'' + value` pattern (used in in perf-sensitive code) throws for Symbol * and Temporal.* types. See https://github.com/facebook/react/pull/22064. * * The functions in this module will throw an easier-to-understand, * easier-to-debug exception with a clear errors message message explaining the * problem. (Instead of a confusing exception thrown inside the implementation * of the `value` object). */ // $FlowFixMe only called in DEV, so void return is not possible. function typeName(value: mixed): string { if (__DEV__) { // toStringTag is needed for namespaced types like Temporal.Instant const hasToStringTag = typeof Symbol === 'function' && Symbol.toStringTag; const type = (hasToStringTag && (value: any)[Symbol.toStringTag]) || (value: any).constructor.name || 'Object'; return type; } } // $FlowFixMe only called in DEV, so void return is not possible. function willCoercionThrow(value: mixed): boolean { if (__DEV__) { if ( value !== null && typeof value === 'object' && value.$$typeof === REACT_OPAQUE_ID_TYPE ) { // OpaqueID type is expected to throw, so React will handle it. Not sure if // it's expected that string coercion will throw, but we'll assume it's OK. // See https://github.com/facebook/react/issues/20127. return; } try { testStringCoercion(value); return false; } catch (e) { return true; } } } function testStringCoercion(value: mixed) { // If you ended up here by following an exception call stack, here's what's // happened: you supplied an object or symbol value to React (as a prop, key, // DOM attribute, CSS property, string ref, etc.) and when React tried to // coerce it to a string using `'' + value`, an exception was thrown. // // The most common types that will cause this exception are `Symbol` instances // and Temporal objects like `Temporal.Instant`. But any object that has a // `valueOf` or `[Symbol.toPrimitive]` method that throws will also cause this // exception. (Library authors do this to prevent users from using built-in // numeric operators like `+` or comparison operators like `>=` because custom // methods are needed to perform accurate arithmetic or comparison.) // // To fix the problem, coerce this object or symbol value to a string before // passing it to React. The most reliable way is usually `String(value)`. // // To find which value is throwing, check the browser or debugger console. // Before this exception was thrown, there should be `console.error` output // that shows the type (Symbol, Temporal.PlainDate, etc.) that caused the // problem and how that type was used: key, atrribute, input value prop, etc. // In most cases, this console output also shows the component and its // ancestor components where the exception happened. // // eslint-disable-next-line react-internal/safe-string-coercion return '' + (value: any); } export function checkAttributeStringCoercion( value: mixed, attributeName: string, ) { if (__DEV__) { if (willCoercionThrow(value)) { console.error( 'The provided `%s` attribute is an unsupported type %s.' + ' This value must be coerced to a string before before using it here.', attributeName, typeName(value), ); return testStringCoercion(value); // throw (to help callers find troubleshooting comments) } } } export function checkKeyStringCoercion(value: mixed) { if (__DEV__) { if (willCoercionThrow(value)) { console.error( 'The provided key is an unsupported type %s.' + ' This value must be coerced to a string before before using it here.', typeName(value), ); return testStringCoercion(value); // throw (to help callers find troubleshooting comments) } } } export function checkPropStringCoercion(value: mixed, propName: string) { if (__DEV__) { if (willCoercionThrow(value)) { console.error( 'The provided `%s` prop is an unsupported type %s.' + ' This value must be coerced to a string before before using it here.', propName, typeName(value), ); return testStringCoercion(value); // throw (to help callers find troubleshooting comments) } } } export function checkCSSPropertyStringCoercion(value: mixed, propName: string) { if (__DEV__) { if (willCoercionThrow(value)) { console.error( 'The provided `%s` CSS property is an unsupported type %s.' + ' This value must be coerced to a string before before using it here.', propName, typeName(value), ); return testStringCoercion(value); // throw (to help callers find troubleshooting comments) } } } export function checkHtmlStringCoercion(value: mixed) { if (__DEV__) { if (willCoercionThrow(value)) { console.error( 'The provided HTML markup uses a value of unsupported type %s.' + ' This value must be coerced to a string before before using it here.', typeName(value), ); return testStringCoercion(value); // throw (to help callers find troubleshooting comments) } } } export function checkFormFieldValueStringCoercion(value: mixed) { if (__DEV__) { if (willCoercionThrow(value)) { console.error( 'Form field values (value, checked, defaultValue, or defaultChecked props)' + ' must be strings, not %s.' + ' This value must be coerced to a string before before using it here.', typeName(value), ); return testStringCoercion(value); // throw (to help callers find troubleshooting comments) } } }