69 строки
1.7 KiB
JavaScript
69 строки
1.7 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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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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* @flow strict-local
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* @format
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*/
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'use strict';
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/**
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* Perform a set of runtime diagnostics, usually useful for test purpose.
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* This is only meaningful for __DEV__ mode.
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*/
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export type RuntimeDiagnostics = {|
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/**
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* Check if the runtime diagnostics is enabled at all.
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*/
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isEnabled: () => boolean,
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/**
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* If enabled, simulate early JavaScript errors during initialization.
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*/
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simulateEarlyJavaScriptErrors: () => void,
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|};
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export type RuntimeDiagnosticFlag = 'early_js_errors' | 'all';
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const flags: Array<RuntimeDiagnosticFlag> = [];
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let isEnabled = false;
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let shouldEnableAll = false;
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if (__DEV__) {
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if (typeof global.RN$DiagnosticFlags === 'string') {
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global.RN$DiagnosticFlags.split(',').forEach(flag => {
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switch (flag) {
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case 'early_js_errors':
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case 'all':
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flags.push(flag);
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break;
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default:
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throw Error(
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`RuntimeDiagnosticsFlags: unknown flag was supplied: '${flag}'`,
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);
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}
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});
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isEnabled = flags.length > 0;
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shouldEnableAll = flags.includes('all');
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}
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}
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const ReactNativeRuntimeDiagnostics: RuntimeDiagnostics = {
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isEnabled: () => isEnabled,
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simulateEarlyJavaScriptErrors: () => {
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if (__DEV__) {
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if (!isEnabled) {
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return;
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}
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if (shouldEnableAll || flags.includes('early_js_errors')) {
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throw Error('[Runtime Diagnostics] Throwing a JavaScript error.');
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}
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}
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},
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};
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module.exports = ReactNativeRuntimeDiagnostics;
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